So thanks to Bill B. and Mike P., I've finished my first .15 carrier plane (Bill's Sniper).  It's powered by a .15 Tiapan Goldhead with a OS .25FP crab (2A I believe).  What prop should I use? % of nitre?  I hear they are pretty much a Cox Conquest.  Mike told me what he runs on his Conquest, would that work?  I have run this motor on 30% nitre and a 7x3 PAC, it was like a rocket.

Once upon a time I had a Taipan 15. It is very much like a Conquest. Many of the parts will exchange. I run my Conquest on 25%-30% nitro, but not really for speed reasons. The engine just throttles better and runs nicer than it did on 10%. Like Wayne said, a 7x4 prop is a good place to start, but try different props and let the stopwatch tell you which is best. Good luck with your Sniper. How about a picture?

BB

Duke, since you get no extra points for exceeding the 72MP_H fast speed my suggestion is to try ever inceasing % of Nitro content.  Start with 15% and with the suggested prop as above increase the % until you consistently hit the top speed for .15.  Why spend the money for 30% fuel if 20% will do the trick.  Just my thoughts. Oh, Ginny is determined to go with me to Portland, so I guess I will see you Sunday.
Joe