.15-.25 sized planes are a blast for sure. I want to build a Sig Kobra one day. But after I get finished with my latest scale monstrosity, I have a .25 sized twin on the board called a .50 caliber. A pattern style twin model for 2 .25's. I have alway's loved my glow engines, but they are going away, and the engines are going to be harder to get.