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Single Use Model Rocket

by SCaruthers, published

Single Use Model Rocket by SCaruthers May 11, 2013

Description

Simple small model rocket designed for single flight using an Estes "C" size model rocket engine and launch system. Prints as one complete object.

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I just posted the version 2 with the CG shifted toward the nose.
See also the new version 2 of this Rocket.
Thanks! Did you try the larger engine yet? I will post another version with a longer body and CG shifted forward. That should be a little better for stability.

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Instructions

See version 2 ( thingiverse.com/thing:92293 )

Printed using default "medium" quality on MakerWare, but with 100% fill. (Actually, fill doesn't matter, as virtually all the rocket components are only as thick as the 2 shells and "fill" is not used....with exception of the flange inside the rocket which is intended to keep the engine from moving forward inside the cowling.) On my printer, the fins tended to curl; therefore, helper disks are recommended (see figure). For the yellow PLA (which does not work as well as my green) I needed to reduce the max print speed to 50mm/s (to stop "stringing"). Print time at 50mm/s is 1:21.

This enging mount is designed with two spring hooks which move out of the way to put the engine in place and spring back to lock the engine in place. These start out as tiny independent squares...which might cause problems, especially if the platform distance/level is not optimal! (I printed on 3M masking tape which seems to help the plastic adhere.)

The nose cone is designed with a weak ring about half way between the very top and the top of the engine (see drawings). The intent is to allow the rocket to blow apart during the final stage when, for a typical model rocket, the nosecone and parachute would otherwise be deployed.

This is designed for a "C" sized engine (18mm o.d.). I may post an adapter to fit the smaller "A" engines.

Intended to be launched from a standard Estes launch pad. Haven't tested it yet, though.

Including the engine, this rocket is ~40 grams. Empty, te rocket is just under 20g.
Have you test flown this rocket yet? I'm interested in printing 20 of these off for a classroom of kids to paint and then launch.
See also the new version 2 of this Rocket.
I did the other day. Used an A8-3 engine, and all it did was blow out the tip of the nose. Now that it's got a vent, I think I'm going to get some C engines. ;)
Thanks! Did you try the larger engine yet? I will post another version with a longer body and CG shifted forward. That should be a little better for stability.
Not yet. Hope to soon, though.
I launched one today. It got about 50 feet up and did an end over and tumble until the recovery charge blew. I'm not sure if the nosecone broke off and caused that, or if the fuselage remained intact and it's a design issue. I have another one that I am going to launch this weekend and see what happens.
I launched another one today. It was another end-over-end flip'er. I think the body will need to be made longer to balance this rocket.
I just posted the version 2 with the CG shifted toward the nose.
I launched one with an 'A' engine and had similar results. Watch for a remix with version 2 with a longer body and center of mass moved forward.
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