3D Printing Idea: Collaboration Build

I am thinking about doing a build based on a collaborative design process. We design a rocket, build it, and fly it in multiple locations.

Anyone interested?

Hmm.... that's an interesting idea. Possibly, I have a current project on the bench, but I'd be interested in seeing what develops, or offering some input.

If it's a FAR101-compatible Model Rocket, I'm down to help build & fly it at my place.

Reminds me of that all-50-states rocket some years back that disappeared halfway through.

dhbarr said:

If it's a FAR101-compatible Model Rocket, I'm down to help build & fly it at my place.

Reminds me of that all-50-states rocket some years back that disappeared halfway through.

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That is sort of the idea. This one will have 3d designed and printed parts.

Chuck I might be interested; love to hear more.

ditto..

Mike & I could lend an "international flavour"!

dr wogz said:

ditto..

Mike & I could lend an "international flavour"!

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We will do the arm lol

Much appreciated. What diameter? 4 inches?

cwbullet said:

Much appreciated. What diameter? 4 inches?

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My opinion, design it to the shipping constraints.

Ok. What are the international restraints?

cwbullet said:

Ok. What are the international restraints?

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We don't have "inches" on our rulers!

None that I know of Chuck, except a suitable launch site for HPR near either Toronto or Montreal.. (I believe we both launch in the US..)

Given limits on HPR flying many people face, maybe it makes sense to make this a D-F rocket. 24mm motor mount, can fly on a D12 but will stand up to an E or F reload if people have a big field. If you wanted to get really tricky, you'd make it fit in a USPS flat rate box (medium: 11.25x8.75x6, large: 12.25x12.25x6). Medium boxes go in the US for $12.80 and large for $17.60. That puts the minimum cost of one person receiving the rocket, flying it, and passing it on around $25-30, which is a pretty low bar for entry.

It would be interesting to try to fly it on every 24mm motor/reload, except maybe the legendary E12. I would be happy to volunteer the CTI F51 and F79 if it makes it out my way.

I am good with 4" and Paul and I attend some of the same US launches. Maybe we will have a drag race.

RKeller, Riley may be interested in this as well. He has been making a bunch of 3D printed rockets over the last year. I printed and launched one and it flew great. I have also seen some of his bigger ones launch and they all flew great.

Riley, get in here!

Funny - 98-100mm then. I know both metric and inches.

I would go with a 29mm mount that can me used with an adaptor.

I would like to build in a retainer.

I would think 29mm (1.142" ) would be the better choice, considering how much "plastic" we might /can be adding..

Ok, 29 mm. How about if we add an option for minimum diameter?

cwbullet said:

Ok, 29 mm. How about if we add an option for minimum diameter?

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Or was that a 29mm motor mount?

For robustness, I think the best solution is a 3D printed skin that fits over a 29mm MMT. I would also use a paper coupler for the larger diameter body tube, which acts as the coupler for the nosecone.

From my experience, the heat-soak from the motor will melt the filament. Also, the exhaust gases from the ejection charge may heat the coupler to the point where it is soft when the shock cord hits it, and this may deform it and prevent the nosecone fitting correctly or at all. I experienced both of these things on a single launch, and although I could have put another motor in it, the nosecone would not fit, so it was a onetime use.

I see an MMT connected to a CR that is connected to a larger BT. This assembly would slide into the 3D printed skin. That is assuming we want these rockets to last; if just for a single launch, then we don't need to do anything but print.

I have pictures somewhere that show what I mean.

29mm motor..