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Model rocket Rockets

by JanM, published

Model rocket Rockets by JanM Aug 21, 2012

Description

a small rocket made to fit a rocket engine, type A10-3T. The fit turned out a liiittle tight, but i have now added .5mm to the diameter in the model-.stl. I printed it with 1% infill, but that probably isn't necessary. Also no extra skins. 0,5mm layer thickness. Turned out almost perfect.

I can change the model quite easy, if people have ideas for minor alterations.

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This is my bigger rocket:

http://www.thingiverse.com/thi...

They both didn't go very high, and the engine popped out the back, as expected really. i had attached the motors to the body with a thin metal wire with slack so that the engine and rocket would stay together after it popped out. but the wire actually snapped :-)

i added an stl file here; rocketparts. (read text above as well) that one went straight up! and was totally awesome, never saw where it landed though :p

this one didn't go very high, small engine and quite havy rocket, but i had two other designs as well. Both for C engine i think, and both will go out here soon. I don't have the time to go in detail right now, but i'll tell all about it, maybe allready tomorrow :-)

How did it turn out? I'm curious about the weight too since I was thinking about trying to launch a fully printed rocket in the near future. I'm guessing a C engine will get the job done, but I haven't weighed anything yet :)

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Instructions

The hole for the engine has a slot for those little metal spring thingies that holds the engine. the hole is deep enough for the entire engine, but i don't know exactly how i will put it to use... I'm not too much into the model rocket world, we are just doing model rockets as a fun start up for new students at our university. Also, this one is not made to split in the air. I have no idea what will happen when the engine blows :-)

The file Rocketparts.stl is a nose cone and a set of fins to put directly on a C-rocket engine. for me it fitted perfectly with just a few layers of scotch tape on one end. you can drill a little hole in the end of the engine (not the business end) to tie a string of some sort to attach the nose and whatever kind of "parachute" you can fit in there...

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FluidDoc on Aug 21, 2012 said:

It'll shoot out the bottom. If you don't want an ejection charge, get a plugged motor. They have a "P" at the end of the designation.

I would definitely check on the stability as well. http://exploration.grc.nasa.go...
Solid infill for the last 20% or so of the nose might help the mass distribution.

JanM on Aug 22, 2012 said:

Unless the whole thing explodes.. :-)

Thanks for the link, and heads up about stability. As I am looking at the rocket now, with engine in place, the center of gravity is definitely above the entire engine (not sure what the center of pressure will actually be). Okay, i did the "string test" on the nasa-page, and the bottom of the rocket ends up in front :-p

This will be interesting come launch day tomorrow. I'm not even sure the engine will be able to lift it, but we'll see.

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