Spyder 0069, thanks for the reply. I took some more measurements and it looks like I might have to make more radical modifications to the engine mount box, for the Saito .72. Is there a chance that you could measure your OS .91 from the back of the carburator to the front of the driving washer? It looks like your modification to the engine mount would move the engine back about 1/2" or a bit less. I do love my two Saito engines, but I am not against trying another brand if it fits this application better. Right now it looks like I will have to shorten the engine mount box by 5/8 to 3/4", to make the Saito .72 fit right. I have not bought the engine yet for the Zero, and have not ruled out a two stroke either, but I really like the sound of the 4 strokes.

I am really glad to hear good reports of the Zero flying. My son and I have been flying now for 2.5 years, and the last year nothing but tail draggers. Slowpoke and a Starduster by Midwest. I think we are ready for our first warbird, we also have the Hangar9 Corsair on the bench almost ready to fly. I am hoping to get both of these birds in the air at the same time, before the end of the year. I just know that when we get both of these planes in the air at the same time, it is going to turn into a furball within the first 5 minutes.

Best regards from old bird.