I am assembling an ESM C-47 and have a couple of questions in regard to the engines I'm thinking of using and coresponding props. The recommended engine is a .91 4 stroke. I've read some of the threads on the RCV .91 CD and I'm getting mixed feelings on that engine. I like the size as it will fit inside the cowling w/ very little eng exposed and still allow for proper cooling. I'm just not sure if the engine will be
adequate . I want to keep it as scale as possible which limits me to a 3 blade prop of no more than 13" in dia. RCV recommends props with a higher than normal pitch. A good 3 blade would seem to be a 13 x 10, but it seems no one makes one. Graupner makes a 12.5" x 7" 3 blade but I'm thinking I'll be over reving the engines. The flying weight is supposed to be around 21-22lbs. Any ideas or suggestions most appreciated.

Thanks, Mike