If we are talking about the Hanger 9 1/4-scale Cap 232, you will be dissapointed with the Saito 150 on this airplane. Even the Saito 180 barely gives you the performance one normally expects on an airplane like this.

The general concensous is this plane is not designed for gas engines. In order to get the performance you want the engine will be much too heavy for the airplane. There are other schools of thought out there but they all stress going with gas engines designed to be light and powerfull -- usually the more expensive engines available.

IMHO, the optimum engine for this airplane is the Moki 180. This is the engine I have on mine. It is an ideal combination of power and weight. Weight for this airplane is a big deal because it generally comes out tail heavy. With the Moki 180 on the nose and the tail surface servos, RX, and battery just aft of CG, no extra weight is needed to balance. It still comes out in the 14lb range.

If you use a smaller engine (OS FX 1.60, Saito 150, Saito 180, Moki 135, Webra 120, etc) you will have to add significant weight to the nose. This will rob you of the power-to-weight benefit you will get from those engines.

If you use heavier engines (most gas engines) you will have to add weight to the tail (even with servos mounted on tail) to properly balance -- you'll end up with a very heavy 1/4-scale.

THOUGHT: Why would anyone be concerned with a heavy airplane if the engine/prop combination easily offsets the added weight? When that engine quits that airplane will drop like a wingless rock -- personal experience.