The Saito 150 sound like the engine if I go with Saito. I gather the YS-110 is the YS engine for the ST. How well does the BCMA fit in the cowl of the ST ? I have not seen this engine and have no idea. You guys have been allot of help and I appreciate it. I have been flying for 20 years but have very little experience in 3-D or gasers in small planes. I do have Large scale with the larger gasers but not the smaller gasers. This is a great forum for info. Thanks . Keith