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Old 08-20-2022, 07:46 AM
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marksp
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Originally Posted by mudflap31
…Not wanting to exceed 6000 rpm in the air i changed to 25x14x4. This gives me 4300 on the ground...
Slightly off topic - Perhaps respond on the UMS thread?

Curious if the 25x14x4 is also Biela?

The reason I ask is I've tried the Biela and the SEP 4-blades on other radial engines. I've found that the SEP more efficient design and lower mass generally fly better.

Hoping to get 25x14x4 SEP or 24x16x4 SEP flight report or telemetry feedback on P-47 fitted with UMS-150. Perhaps 26x14x4 SEP might be suited for this engine/model combo?

I have both SEP & Biela for my UMS-250, Moki S250 & S215 and in all cases, the SEP fly better while the Biela look more “scale”.
Last edited by marksp; 08-21-2022 at 05:23 AM.
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