yep, I've got an ARF trainer. Why can't they leave a little room for foam? It had the tank in it when I won it at a fun fly. I've got to go back and pull it a part, cut down the lite ply its mounted in, and put some light foam in before I ruin my engine. Yes, I know. I like running my planes lean. With the extra air at high speeds in is heating up and quitting. Did anyone ever tell ya its a fast way to burn up a good engine?