The Corsair is a Koyosho ARF, 71" wingspan. DLE 20 with compact pitts muffler from J-Tec. Turns about 7,100 rpm. The Tony (KI-61) is a Flite Models ARF, 71" wingspan.Carb cooling was a real problem but finally got it sorted out. Took some careful baffling, air ducts and cowl flap. The plane flies great but I believe no longer available. From Hobby King. The P-40 is Top Flite 60 size ARF. Unfortunately no long available. The plane flies good with no bad problems. This DLE 20 has a "Bowman Ring" (he is now retired). and Bowman treatment re the reed valves. This involves honing the surface of the reed valve block to get a better seal. The engine starts easy, idles good and runs great. I think I'm getting about 7,500 rpm. This on also has a compact pitts muffler.