RE: RCV motors.
Hi, I've been using the RCV 90 SP for about a year, - the initial experience was not too good but after taking advice from WestonI'm very happy with the engine. Basically the advice I was given was-
Don't run the engine with a fuel containing castor (I use Prosynth 10). This is contrary to the instructions that came with the engine recommending Duraglow 10.
Don't run the engine without a baffle, either in a model or on a test stand. Weston recommend abox structure with 2 sides and a rear fitted closely to to cooling fins.
I've found that since I followed this advice the engine runs and throttles perfectly without overheating. I use a four-bladed APC prop and this flies a 10 pound model (Short Seamew) at half throttle.
Hope you find this useful.
Cheers.