I am using 8611s or 5945s all around. I re-checked the balance on both planes this AM.. they are closer to the aft limit than to the forward limits and my hypothesis from reading some of the posts here on RCU is that the CG numbers on both these planes were "not so good" in the manuals. I am in the process of moving some weight forward. Looks like the gale is moving back in again.. high winds the next few days.. so it might be next week before I fly again. I don't mind some wind, but they are taking 20-30mph tomorrow!

The past few planes I have put together have been 33% - 40%. I find them much more forgiving to balance. Since they also were all H9 ARFs 1 Comp-Arf and 2 Cardens their manuals and/or designers have the CG and thrust numbers dead on. Mike M and Dennis gave me starting points and I never had to change them after the first flights. Comp-Arfs are hugely popular so I got those numbers here.

I have not found anyone who has built an Aerotech Extra, and what few people built the Columbo's all moved on to other stuff!

Again, thanks for the info.

DP