Any of the world models 46 size war birds are fast with a YS 115. have to do a few mods though. They have a Spitfire specially designed for warbird racing. I have 5 of them. These on 60% nitro will do around 170 mpg straight and level no dive. These are perfect for the Warbird race coming up at the NATS this year. Also check out 1/8th scale models on the web or on face book. I have a few of his builders kits and they are faster than the world models planes