I recently rebuilt my two stage Renegade, replacing the original 18 mm motor mount with a 24 mm mount. The original design was woefully under powered with a C6-0 booster to a C6-5 sustainer, and this last spring I proved it at Gunter, Texas when my sustainer ended up in the nearby lake. (I chronicled my successes and failures on Bernie Sanders' Sagitta Cantina, here

http://forum.starportsagitta.net/vi...f7ca97a61#p2057

In any event, it is once again rebuilt and I am confident that it will fly correctly once weather and field conditions improve. I think I will take stefani's suggestion and add vent holes in the booster centering rings.

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