Granpooba, the Eindecker is a wonderful model. Its really a sport model that looks like an Eindecker. Built lightly, its a floater and the either Saito would be more than enough. I add scale details which affect the weight. I recently built an Eindecker but turned into a Morane Saunlier Type G. Used the cowl from a 1/4 scale Pup kit. It flew initially with a Saito 100 but it wasn't enough power. I have recently re-engined the plane with a Zenoah G20 and it flies superbly. You will notice it will fly like a big trainer and it will become the one you like to bring as its easy to set-up and fly. Don't expect it to be a high performance acro plane but it will do loops and rolls and generally putt around the sky quite nicely. You'll love it.