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vis
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Posted 3 Years, 5 Months ago #1
The OS manual recommends a broad range of props for the engine:
11x8, 11x9, 12x7, 12x8, 12.5x6, 13.5x8, 14x7

I will be using fuel with 10% nitro.

I know people who run 14x7 on 91 four strokes, so that seems too big for my
70.

The engine is going in a Goldberg Tiger 60 kit
The kit specs list the weight as 7.5 pounds

The kit is described as a sport scale low wing trainer, so I do not expect to be boring holes in the sky. Any guidance on a starting point would be appreciated.
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maddmax
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Posted 3 Years, 5 Months ago #2
So could a piece of nylon rope!
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Godless
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Posted 11 Months, 3 Weeks ago #3
I run a 13.5x6" Bolly Prop on my 70 Surpass.

Turning around 9,450rpm on the ground.

That engine and prop combo is in an Edge 540 .40 size I have.
I dont 3D. Just bore holes in the sky.

APC and Master Airscrew 14x6 props seem to lack pull on this plane with the 70 Surpass.

I did run a 12x8 APC on it and it was an absolute rocket. Hard to slow down for landing sometimes with that prop tho.
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