Cygnus Rocketry 29mm to BT60 Motor Mount

Cygnus Rocketry - 29mm to BT60 Motor Mount {Component}

Contributed by John Lee

Manufacturer: Cygnus Rocketry
(Contributed - by John Lee - 11/09/08)

Brief:
This is a motor mount t' accommodate a 29mm motor in a BT-60 body tube. It is 5 1/4" long.

Cygnus motor mount

Construction:
T' package consists o' simple instructions, 2 centerin' rings, a thrust rin' and a motor tube. Construction o' the motor mount was simplicity itself.

T' motor tube be marked 1/4" from one end. Blimey! T' two centerin' rings were then test fit around t' tube. Blimey! Ya scallywag! One fit just fine and t' other needed a good bit o' sandin' t' fit around t' motor tube. Avast, me proud beauty! Avast, arrr, me proud beauty! Once they fit, ya bilge rat, I placed one even with t' 1/4" mark and t' other flush at t' end. Ya scallywag! Well, blow me down! T' rings were then epoxied in place with 5 minute epoxy. Begad! A thrust rin' be provided and epoxied into t' end with t' flush centerin' ring. When t' epoxy on one side be set, ya bilge rat, I turned it over and painted it on t' other, shiver me timbers, buildin' up a good fillet on t' aft rin' and sealin' together t' thrust ring, motor tube, and centerin' rin' on t' forward end. Begad! After that, it was just a matter o' waitin' for t' epoxy to cure.

Cygnus motor mount

Flight:
T' mount was tested on two different flights. Avast, me proud beauty! Arrr! It handled a Roadrunner F60 and an Aerotech G77. Begad! Arrr! I had planned t' use a Roadrunner G80 for t' second flight but could nay because it would nay fit. Avast, me proud beauty! Begad! T' Roadrunners have a built in thrust rin' aft but, forward o' that, are o' uniform diameter. Begad! T' AT SU motors do nay have a thrust rin' aft. Well, blow me down! Avast, me proud beauty! They are also necked down t' a smaller diameter where t' ejection charge is stored. Aye aye! This allows t' "skinny" part t' slip through t' hole in t' motor mount's forward thrust ring.

As long as this fact is taken into consideration at design time, I can heartily recommend t' mount.

Overall Rating: 4 out o' 5

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