Design
I started out wanting a 4-cluster 29mm rocket. I
was looking into getting a LOC 4-29ss, but decided that I could do a
better job on my own for what I wanted to do. It turned out to be
a flying hardware store, with lots of nuts, bolts, brass plates, and
everything else one could think of to help transfer the loads in this
completely modular design.
Construction
I started with 4x 29mm tubes, and some LOC 3"
tubing. As things grew more complicated, I decided to lean towards
the side of complexity. Who says you can't have fun with Class C
motors?
The booster is capable of holding any 29mm motor.
A piece of 1/4-20 allthread runs through the motor mount section up into
the bottom of the timer bay. This transfers its load to the top
bulkplate with 2 more pieces of 1/4-20 allthread and a brass plate,
creating the backbone of the booster unit. Two small brass tubes
run from the center of the timer bay down to the base of the rocket to
run airstart wiring. The tubing barely fits a Daveyfire match.
The fins are made out of 0.093 G10 fiberglass, and
beveled on leading and trailing edges with my fin beveling jig.
They were attached in between the exposed motor tubes, and given
generous fillets of Aeropoxy mixed with colloidal silica and chopped
glass. Everything was epoxied together and now the booster is
nearly bulletproof. The 3" outer body tube is acting simply
as a skin, with all of the loads being transferred internally.
I'm using the upper electronics bay from
Inspector Gadget, and doing same end dual deploy using a Tether.
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Thrust transfer
plate and airstart tubing being epoxied in place.
Base view showing all thread motor retainer and
airstart tubing.
The complete booster. Note the allthreads sticking out the
top, waiting to be trimmed.
Blacksky Timer2N backmounted on board.
Wow that's a nice fit.
You can just see the glow of the LEDs.
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