Had the maiden flight on the Hellcat today and what a sweet flyer she is. Fly's like a trainer in the sky. I have to say it flies better than all of my Hangar 9 warbirds. The YS 120 has plenty of power for this plane. Would fly great with a 91 size fourstroke. I had to put 6 ounces of lead in the tail and it balanced a 5". I would recommend this plane to anyone wishing to fly a warbird.