ORIGINAL: opjose
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.
ok ill give it a go.
people at my field were like why are you running a 10x7 on that .47. you should use a 10x6
in the back of my mind im like "i have this old magnum that doesnt have much umph on a 10x6 why would i want a 10x6 on my nice and powerful gms .47?"
.....but they put a 10x6 apc on it.
i have a bunch of 10x7 MAS props that i normally use. i actually prefer topflite wood props but during the winter they break real easy.
so i put the 10x7 back on it when i got home. it did work on that 10x6 though.
i also have a 11x5 apc that im going to try. i think i have a 11x6 topflight that i might throw on their as well. well see
a while back i had a top flight 10x8 on it but it took quite a while to spool up.
(plane with the gms is a gp rapture)
would a topflight 11x4 be fine for that old magnum? (im worried i might be under proping it) its a magnum .40 GPA, a bushed engine. (on a spad stick)