Originally Posted by James Pierson

Has anyone tried to change the Centuri Bulldog's aft BT55 to an BT60 or ST16 and use two 18mm motors or maybe even three 18mm. Just a thought . It would change the rear dia or the transition a little but it will have better motor choices in theory.

James Pierson
NAR# 77907

Originally Posted by rkt2k1

"By your command!" (a little Battlestar Galactica nostalgia in recognition of last season of new series! )

Great suggestion James! Motor selection is much greater with a dual 18mm motor mount.

I changed out the BT-55 tube with a BT-60 and modified the custom paper tailcone accordingly. I changed out the BT-50 engine mount with an appropriate BT-20 mount and used the cluster wizard to complete.

Although I retained the 48" launch rod, most of these motor combinations easily reach safe velocity withing the standard 36" rod length. Here are the numbers and the additional design file.

Enjoy!

... Bill

Centuri Bulldog - Dual 18mm Engine Mount

Motor........Max Alt......DV..

2 x B6-4......293.88.....13.36
2 x B6Q-4.....344.94......4.32
2 x c6-5......761.03......4.22
2 x C6Q-5.....756.35......3.86
2 x D13-7....1611.95......8.63
2 x D21-7....1638.28......8.85
2 x D24-7....1525.36......3.15