That's the kind of thing you usually have to come up with yourself. The plane in my photo is a Bud Nosen Trainer, which was made by a company that's no longer around as far as I know. It was designed for a single .60 engine, but I've seen them with twice that, which is way too much. I modified it to fly with four engines. The ones in the photo are OS 26 four stroke engines, for a total of 1.04 cubic inches, which also is way too much. It would hardly sit still on the runway. The way I designed it, the nacelles and engines could be removed and replaced by a single .91 in the nose without changing the center of gravity.
That's a huge plane, with a 102" wingspan. That kind of stuff is a lot of fun, but you need a big space to fly it. If you want to build a multi engine model, I can offer some advice. I've done a few of them. In addition to the Nosen I also built a tri-motor Telemaster and a twin Eaglet trainer. I also built a push-pull plane called the RCM Twin Scooter, although I didn't like it much.
. i do know the prop is awfully close to the engine. i may have some trouble getting the prop to pull the air Around the engine but it shud be ok i hope.
