Model rocket Rockets

by JanM, published

Model rocket Rockets by JanM Aug 21, 2012
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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.


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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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.gov/education/rocket/rktstabc.htmlhttp://exploration.grc.nasa.go...
Solid infill for the last 20% or so of the nose might help the mass distribution.

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.

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 :)

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 :-)

This is my bigger rocket:


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

model rocket Rocket C
by JanM