WEBVTT

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All right, our next talk is from Joe Hingliff on open-source rocketry, building not only the

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tools, but also the know-how, so please give a warm welcome to Joe Hingliff.

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Hello.

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First of all, thank you very much for having me, my mother taught me to say that in every

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room I ever go into, it's a British thing, but yeah, thank you very much for having me.

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So yeah, I'd like to talk to you about open-source rocketry and tools, free CAD and beyond.

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And so this is an example of an open-source rocket designed that I've built and flown.

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It's called the ODR rocket, it's the open-design rocket, it's up on a GitHub, it's other

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repo, which is a bit random, a random place to put a rocket, but you know, and it's designed

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it's just for scale, it's about a meter and a half tall, and this is designed to go

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to about 1200 meters, 1200 meters in about 12 seconds.

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So that's pretty violent, that's pretty fast, and yeah, it's kind of cool, it'll separate

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into what two sections, apogee, put out a little drove parachute, so it comes down quick,

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but close to you, and then it'll check out a bigger parachute with some electronic

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dohikis that make it explode at about 200 meters, so that it slows down and comes in

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and lands nicely.

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But I don't just make rockets, I make all kinds of things, I actually just about managed

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to earn a living, making stuff and writing about it, so I've written a free to download

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book about free CAD, which is like a beautiful free and open-source mechanical CAD environment,

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and I've also recently written a design, an RP2040 board with key CAD, which is the

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worst title I've ever seen, I didn't choose it, it's actually just about how to get

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started with key CAD and takes you through to like, you can do a PCBA board with JLC PCB.

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So yeah, I make all kinds of things, you know, I've got a little educational robot that's

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open-source and all kinds of stuff, and sometimes I build really tiny rockets, so this

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rocket is just 18 centimeters tall, and it weighs less than 17 and a half grams, and this

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is like a very proud rocket for me, because with this rocket I set a UK altitude record

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for rocketry using the smallest commercially available rocket motor you can get, which

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is like way less than the size of my little finger.

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So yeah, and it's a good example of, there are two main problems when you start to

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want to design a little rocket rather than buy a kit rocket.

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The two problems that most rocketry sort of amateurs face when they start designing rockets

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is one, nose cones.

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So traditionally maybe rocket people would like wittle them with a knife out of a piece of

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bolster wood, and it's not very good to kind of say you've read some research about

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Von Carman-style nose cones with certain geometric features, you're not really going

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to, well, I'm not talented enough to kind of file that out with a hand tool, so that's

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one problem, and then actual rocket design, how is my vehicle stable?

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Is it going to fly upwards, or is it going to do this, and then go into, usually what happens

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if it does do this is when it eventually straightens out, it will go for the most expensive

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car in the facility.

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That's what they just do it, it's like an unwritten rule.

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So yeah, so you can see, actually, the way that I took this record of a very eminent

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PhD guy from a rocketry organization in ICL in the UK, is he had that to use a commercial

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known nose cone bought from a model shop, by the time I tried my record attempt, I really

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printing was commonplace, and so I did like a vase mode nose cone design, and then sanded

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it down, and it was like if you looked at it too sternly, it would just break.

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So yeah, 3D printing kind of kind of results from that, but they're the main two problems,

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nose cones and stability.

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So I was getting into 3D printing with my designs, and I started off using OpenSkad, which

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we've heard mentioned before, with OpenFledger, fantastic piece of software that freecat

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loves and interacts with, and we love it, and oh yeah, if there was a sub-title to this

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talk, it's like an open source rocketry tools and a freecat and beyond, or the secret

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underbelly of community developer relations.

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So I was making those codes, and I found somebody had written a guy called Dave in Canada,

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had written a little parametric script, which took all these complex nose cone geometries

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in OpenSkad, and you could like type in the one you wanted and type in some parameters,

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and it would just generate it for you, and you could render it as an STL and export it

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in 3D built it.

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And it was like, oh my god, this is amazing, this is fantastic.

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And it was all based off like lots of this nose cone stuff, like tangent OGs and spits,

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spherically, blunted, tangent OGs, and all these weird families are like, quite well documented

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on Wikipedia and stuff, so Dave had gone through all this and brought this into OpenSkad

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and then put his parametric file online.

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And of course, it doesn't just mean that you can freely print your nose cones, you can

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get into things like making moulds to make small fiberglass composite layups for your

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small rocket nose cones and stuff like that.

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So I kind of got that sorted and it was like, oh, this is super cool.

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OK, so the other problem, the stability problem.

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Well, there's a really old, well, really long running open source projects in the

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lock it through a community called OpenRocket and OpenRocket is, and this is OpenRocket.

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And basically, this allows you to design your rocket sort of symbolically and you can

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see all the components getting added here, so there's like a nose cone and a body tube

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and you can add like parachutes and you can add motors and stuff.

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And you can see on the other side, I've got the nose cone dialogue open and I can select

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from different families of shapes and putting different parameters.

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And as it builds, as you build your rocket in this, you can see these two points,

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well, you may be able to see these two points.

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There's this blue point which is the center of mass and at the back end there's a red

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dot which is the center of pressure.

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And basically, in a very, very, in a nutshell, what you need is your center of pressure

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to be behind your center of mass and you need it to be behind it, that would be very

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overstable and would turn into the winter much.

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You need it to be a bit behind it, but not too much is a a heuristic definitely like

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there's more to it than that.

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And so as you add components in OpenRocket, you can select the materials that they

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made out of which obviously affects the mass and you can select the surface finish which

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obviously affects things like the drag and it will adjust these coordinates for you.

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And basically, you can think about it that the center of mass is where the rocket will

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rotate around and the center of pressure is the length of the lever that exerts a

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force on it.

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So if there's a side breeze and you have a big lever with your center of pressure

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far back, it will turn into the wind more which may or may not be desirable.

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So what OpenRocket is doing is a complex set of equations, it's an enhanced set of the

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barrowman equations which were written by a guy called Jim Barrowman in the 60s Fognassa

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who realized that actually when we don't always need to put 100 like people with sliders

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in a room to work out like the really complex.

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Find our element stuff by hand for these things, sometimes for like our sounding rocket

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program we just basically need to know if they're stable and roughly how they're going

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to perform.

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So that's where these equations come from.

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And you can do them by hand and it's not particularly complex but there's a lot of

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it and you have to do a lot of it for each component and this you make one change in

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your component, you have to recalculate it all and you get to a lot of paper and a lot

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of coffee but it's perfectly possible to do it without OpenRocket but it's much easier

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to do it without OpenRocket.

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OpenRocket has some other brilliant things so it has a database within it of all the commercially

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available components for model and high power amateur rockets.

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So if you have a little estes rocket that you maybe even bought in the 1970s and built

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and flew as a child and you still have it, you can actually sort of create that in OpenRocket

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from a known database of components and then you can simulate, say they said all you should

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always fly it with this motor and you want to know how does it go with a bigger motor,

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you can actually do that in this program and this database will kind of creep back in a

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little bit later in the talk.

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So you design your rocket and the top left bit here is you can, there's a database

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of commercially available motors and you can insert those motors into your design and

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it will simulate the flight so it will simulate the not just the acceleration and the altitude

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but it will actually this is a two stage rocket where the two stages are coming down separately

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on the two different parachutes with different drag coefficients and so it actually

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shows like the two descents of the two stages and all that kind of stuff so you've got a

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pretty complex kind of simulation of your flight.

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The little image down on the right hand side is there's a little application outside of OpenRocket

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there's another open source application that allows you to, it's really cool, it allows you to

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trace and correctly scale any image of a thrust curve of a motor and so you can draw over the

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top of it and put in some motor information and you can characterise and create a little rocket

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simulation, a little rocket motor simulation file that you can then contribute back into the

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database of motors available in OpenRocket so recently a new manufacturer has come on

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line called TSP and they're making lots of rocket motors and they're publishing their

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sort of data sheets with the thrust curves and I've been going through and actually making the

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ENG files that we can then put back into the simulation so yeah it's super fun and but what

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that means that because we can add these motor files it actually means that if you build for

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example like this is half-capped rocketry in the US and and this is a completely open source

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project where you can build so this is one of four rocket platforms that they've built an open source

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this is Mojavez thinks apologies for pronunciation and and this is like a a bi-propellant liquid

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engine rocket design that they have built and launched and then documented incredibly well

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and and really really interestingly they profile their motor or a load cell or a thrust

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style and publish the thing and they did all their simulations in OpenRocket so as much as I

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talk about the kind of the modland of stuff and the the maybe the stuff that's like this big

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don't feel that this doesn't apply to really kind of high end rocketry stuff so the one thing

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that OpenRocket doesn't do it doesn't give you any CADO put so say I design something in there

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and I'm like what I love this shape of thin I can't actually get like a tool path out of that

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to cut that on a milling machine or a laser cutter or something so I'm involved in talking about

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and helping out and I do a bit of blog writing for freecats and so I suddenly sort of became

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aware of thinking well maybe there's like an idea here maybe we could have a rocket but workbench

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that gets added on optionally to freecats and wouldn't it be in my my mind I was like it

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be really cool if I could kind of take my design that I've done in the other tool and kind of plug

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those parameters into freecats and then actually get editable sort of CAD that I can add

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geometry to 3v print from and do all this stuff so but I'm not a dev I'm not a dev at all so

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I have no idea how to build that so my approach was I put up a request for comments on the

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freecats thought for them and paid my dues you know first of all massive thanks for the freecats

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community from such an amazing project blah blah then I explain my kind of where I'm at I'm really

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into this and I kind of think rocket is interesting and then do you remember Dave from Canada

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I found him on Twitter and I'm not that he saw this thing so so quite early on in the response

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he was like oh hey everybody I yeah I did some stuff in open schedule I developed a macro

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for nosecoar and some for freecats and yeah oh if people are having problems with that maybe

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yeah I'm not sure as there's enough for a rocket workbench I'm not sure and then at one point

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if you see the sort of third line from the bottom you put convince me so I did three messages

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later curse you concrete dark which is my online Nick for sucking me in thank you to this a

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little more in the context of open rocket it's going to be quite tricky blah blah I don't know

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how I do this I'm not sure how I do this cue the community ah what you would do is you would do

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this and of course this is the beautiful wonderful secret well not secret here the wonderful secret

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source of the open source community isn't it that we all help each other so there's this guy who's

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kind of like nearly at the point where we can build a a a workbench and the community sees that

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there's an opportunity here and they backfill all this in so Dave I I I giggle with him that I've like

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ruined his retirement he's a software he's like he'd literally just is the resigned and I made

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more work for him than the last 10 years of his career but we we giggle about it but he's really

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enjoying his his time in freak out and in the community and so yeah and so cut to a few months later

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this is like one of the first early versions of the freak out rocket workbench so you plug it

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in via the other manager and it has you can see the yellow symbols there and they all track

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to like rocket components that you can add in to your design so I've just grabbed this from the

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documentation so there's like create a nose cone create transition sections great body to

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central these all these parts create thin cans and fins and so yeah so it's really really cool

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but what's even cooler is he really kind of got my original idea of let's make it work in an

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operable way similar to open rocket so do you remember I said about the database in open rocket

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there's the same database because it's open it's open data so you can go into the rocket

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workbench in freak out and you can either parametrically insert a nose cone and even this looks

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the same as open rocket you can click through the same family of nose cones you can put in the

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same parameters but instead of just a simulation 2D item it will produce like geometry in the preview

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or you can go into the database of known components and you can pull in a component that

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exists so your grandparent's 1960s ss model rocket that's missing a nose cone that's in the loft

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you can 3D print a brand new one that will print perfectly and one of the beautiful things

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about this is that I can go into a rocket's a community who've never used freak out and I can

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get to the point where they have an STL of something they absolutely love you know a bit like

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model where were guys the things in rocket that I can show like a man of a certain age in

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rocketry and a certain nose cone and they like oh god that makes me feel alive and so yeah I

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can get to that point where they have that STL ready to print in about 20 clicks without even

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installing like from downloading freak out so it's super cool as a sort of outreach thing

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then this isn't particularly my bag but rocketry people are mad into they build a design and

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then they want to make it massive or they want to make it smaller or they have at something from

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the 60s and they want to make it bigger because they've got basically rocketry is a really good

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way to fold up all the money you earn and set fire to it in a field and they really want to do

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it and they want to do it in things that look like big versions of things they had as kids so again

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about 25 clicks you can get in those cone in you can jump out of the rocket workbench

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and use all the other tools in freak out so here we are in the draft workbench I've selected

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the nose cone I've put you know scale it by you know XYZ factor of 2 and there we go this one

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that's twice the size so scale modeling which is not my bag but is a real bag in the community

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is is really kind of tangible and doable and then of course that's the gateway drug for these

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poor rocketry people wondering around not using CAD who end up here they then say oh well

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it'd be really nice if I could put something like attach my my landed that keeps the nose cone

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attached to the rocket when it all comes down under a parachute blah blah blah and so of course then

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you start to find these people are now exploring like the regular kind of like part design the

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very core sort of CAD parts of freak out and basically learning general CAD to add kind of stuff

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to their components but there's some really complex stuff in this in this that doesn't exist

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in any of the CAD anywhere else in the world so like for example some people like to build rockets

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where the thin and the can of the fins that it attaches to is all the same device so there's a

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kind of section where you can you can create these parametrically but what's really interesting is

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what Dave's got into around this so he has some test branches and some of the stuff that's

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happening in test branches he's actually now stuff that's really interesting for people in the

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rocketry industry like people at ESA and stuff like that so he has a tool that basically can perform

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thin flutter analysis so even an even a reasonably small high power rocket as that rocket

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approaches or transitions to Mac your fins are going to flutter and it's a real engineering headache

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to work out how robust and my fins need to be to survive this flight and thin flutter analysis is

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like there's a heap of academic papers out there it's a very complex set of maths but it's a process

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that's really we're doing because of course if you reinforce them too much they're heavy and they're

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more draggy so you want the minimum amount of sort of stuff you can do to make your rocket survive so

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and this tool is now coming into the test branches that performs these these things in a really

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kind of friendly way and so that's yeah so the test branches are really interesting to check out

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he's also linking it all up to the sort of computational fluid dynamic stuff that's built into

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free card with you know all the open forms of poor and all the the different solvers and stuff

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and so and what's really interesting for me is that I'm starting to see in sort of other sectors

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of rocketry like this is a long standing American newsletter about rocketry that comes out

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once a month there was two articles that featured free card and the CFD kind of workbench the

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rocket workbench and there was somebody from very much from the rocketry community not from the

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CAD community teaching other people through tutorial how to do sort of fluid dynamics on model

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rocket designs and I just kind of think hey that's super cool to see that's super cool so and so Dave

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you know I've kind of ruined his life he one of the big things he's working on

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American free card is he's actually started to work on core parts of free card because it impacts

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on the model rocket stuff so he is now working massively on the material editor for free card

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because what we want to be able to do is know how much the nose cones weigh and other other

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other all this kind of stuff so he's actually now become this like really central kind of core

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contributor and free card and how did I thank Dave how did I thank him last year I built this open

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source rocket and because I am an awkward sod who decided to build it completely hexagonal

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because I thought that would be cool I couldn't use any of Dave's tools I mean I'm a terrible human

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being and basically so that the whole talk which is coming to an end now is to be where be where

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of sneaky community developers like me trying to ensnare you into these one little things but

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the serious point that I'll finish on is none of these tools could exist in proprietary software

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you could not go to or to there for anybody and say hey can you build it what you could but they've

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won $20 million so yeah and the fact that these two communities open rocket and the rocket

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workmen add on with in free card are all really happily kind of working together there's kind

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of pushing and pulling and that they complement each other they share databases the database in open

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rocket is way better because it's been pushed by the people coming through the free card route

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it's all just gorgeous right I shall stop thank you very much for having me

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question

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so I should probably mute it well I slurped water sorry hey thanks for the talk

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actually two questions but one is is the interaction with the other workbenches like

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airfoil for example and the second question is in open rocket you showed all the

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these stability analysis is that also included in the rocket workbench and so is there any

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point to still having open rocket so there were there were two questions one is about

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is the stuff about stability in the rocket workbench included and the other one was about

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is it therefore and then is there any kind of point to the open rocket part anymore so

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and I don't think so down the line Dave plans to make it so that we can actually natively open

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the ORK files which are what open rocket uses and so that it creates our kind of card stuff

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I don't think it particularly has plans to take over the core feature of open rocket which is

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the simulation that's pretty robust and there are there are lots of people in the rocket

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community who that tool is enough for that and that's all they want to use so I think just as a

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sort of cursing we're probably not going to build that stuff into into the rocket workbench because

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it works super pretty well yeah so exporting and analysis and so it's coming in the testing and

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the air flow workbench is interesting I'm not that familiar with it I'm not sure it's is it has

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that actively developed at the moment I'm not sure and but certainly the CDF the you know the

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I never thank you and the CFD workbench that that helpfully helps you install open form

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open foam yeah it links to all of that so yeah cool

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yeah two questions one could you reuse any code from open rocket and two is this going to

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lead to freak out having export restrictions for being able to do so yeah so the first question

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was can you reuse any of the code in open rocket in the rocket workbench and the second one was

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can any of this can it could it lead to freak out restrictions due to it or similar

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first question I don't really know I'm not a dev I'm a word that open rocket is actually a

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Java application so so that you know but certainly there's a lot of shared resources there with

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not shared code and as an aside the development of this rocket workbench is actually reinvigorated

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the open sorry the rocket workbench in freak out has actually really reinvigorated the team and

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new contributors to the open rocket project so that's had a great load of incremental leaps

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the second one about ITAR I doubt it yeah I doubt that and the rocket workbench is ever going to

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be a core part of freak out it's always going to be an adult and I think that gives us some nice

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ways of saying it yes you could do whatever you like in your country but it does not come with this tool

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okay thank you Jill you're welcome

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thank you

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right here

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All right, can you test your microphone?

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All right, test test?

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Yes.

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Okay, welcome to the open hardware.

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We're dead for this Sunday afternoon.

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Our next presentation is one that we have had more questions on than just about any other presentation.

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How do I draw beautiful wire diagrams?

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Is there something out there?

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Yes, there is.

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We are going to now hear about wire viz and making your wiring cabinets more beautiful.

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So please,