Robert Goddard's Nell Tribute Model
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It's the 100th anniversary of the flight of the first liquid powered rocket invented by Robert Goddard. The Nell!
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- Printables
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- Engineering
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- Creative Commons — Attribution — Share Alike
Robert Goddard's 'Nell' model rocket tribute.
NOTE: Just like the real Nell, this flying model is experimental and a work in progress. I will be posting updates as they come, but if you're into exploring this kit, here are the parts that should get you going, maybe in time for the 100th anniversary!
I will be expanding this description as I further explore making this model fly. Now, like the real Nell this model may be only good for one flight, but will see.
Things that need to be tested;
Will this configuration give a stable flight
Will it survive tumble recovery as there will not be a parachute
Can motor ejection work and not damage the model
Will the motor thrust damage the exhaust shield
Of all the 13 mm motors, which one is the most ideal for a tribute flight
Extra Parts needed:
Launch Lug Positions
So I've got some ideas about launch rod support points. It's possible I could get away with just A&B but those don't traverse the launch rod very long. Using only C&D leaves the top a little floppy, so maybe the best approach would be B,C&D. I've included version of the parts to support each approach. Once I'm sure of what works best, I'll revisit this model and update it accordingly.
Motor mount and recovery
This model is designed to eject its motor. Using a motor inserted flus with the tube, glue the recovery ring to the top of a 52.5mm length of BT-5 tubing. Now, if you don't have any BT-5 tubing and don't want to buy some, you can just wrap tape around the motor and the recovery ring, however you'll probably have to replace the recovery ring after each flight...maybe.
I'm thinking the model should tumble recover as it doesn't have a sound aerodynamic shape. If it just ejects the motor - that may improve the way it falls.
The recovery ring can be used in one of two ways - to keep the motor attached to the model or to allow for a streamer to be attached to either the model or the ejected motor. At minimum I think attaching the streamer to the motor will make that much easier to find.
BT-5 motor retention versus tape
The exhaust deflector
The exhaust deflector can be either glued to the lower body, or you can use 2mm screws. For the time being the holes are not perfectly centered (sorry) so the lower body does need aligned correctly. The correct alinement is easy to find.
