Well just because someone flat out said it shouldnt be done, I a just about ready to mount up my Syssa 3Occ gas engine in the Venus. I weighed everything from my Saito setup and got 984 grams and my Syssa with the muffler and its 1050 grams. That not counting the ignition thou. Someone said putting a gas engine in the Venus would totally mess up it flight dynamics. I totally dissagree with that statement. That would only occur it the plane wasn't rebalanced which I am sure I will have to do. I should be able to get the tank over the CG and get my flight battery as far back as I can. The Syssa is really narrow and fit inside of the cowl nicely even with it Pitts muffler. I got second place in IMAC basic pulling a 14 bird with the Syssa so it should pull the Venus around. Well see and if it doesn't work out. Oh well