Prop size
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Prop size
Hello all,
I have a OS MAX FX .46, and I just got the Macs tuned pipe outfit for it. I understand this is not really a purpose built speed engine, but should still be able to produce a descent turn of speed. My question is, what size of prop would anyone recommend? I have some 9x12's (too big I expect) and some 7x9.5's (too small?). I have a feeling I may need to get something in between.
Chris
I have a OS MAX FX .46, and I just got the Macs tuned pipe outfit for it. I understand this is not really a purpose built speed engine, but should still be able to produce a descent turn of speed. My question is, what size of prop would anyone recommend? I have some 9x12's (too big I expect) and some 7x9.5's (too small?). I have a feeling I may need to get something in between.
Chris
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RE: Prop size
The 9x7 is a great place to start...Depending how slick your airframe is would make a difference here- 9x8 might be good and there are a lot of pylon porps to choose from in between.
Let us know the airplane and maybe we can offer some better info.
Let us know the airplane and maybe we can offer some better info.
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RE: Prop size
Thanks guys
I am building an airframe around the engine. It is similar to the F3S Speedcup airframes in appearance - the engine and pipe will be cowled so it will be very sleek.
Chris
I am building an airframe around the engine. It is similar to the F3S Speedcup airframes in appearance - the engine and pipe will be cowled so it will be very sleek.
Chris
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RE: Prop size
I ran the same engine with a UltraThrust tuned muffler and a 9 x 7 worked great. An 8.5 x 9 would have the same load and may be faster on your plane if it is slippery enough.