ORIGINAL: jimmyjames213
im a little confused at to why people run big props like a 11x7 on a .47 engine. what ever works for them i guess. or maybe its cause i run a low nitro (5%). but much above a 10x7 and it takes forever to spool up.
The GMS .47 produces a bit more power than other .46 engines, so you could go the way you did and use a 10x7 prop or an 11x6 prop for a heavier plane, but you can also use an 11x7 prop on a lighter plane to buy you both speed and thrust.
I've done it both ways and the larger prop works VERY well on a more lightly built .50 plane or a smaller .40 plane.