OS 10LA - props
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RE: OS 10LA - props
ORIGINAL: combatpigg
Matt, I think .10s run best with 7x3 props. You might find that the engine can be set closer to peak. I've said this all along about .10s VS .15s......they aren't as versatile, they are more specific about what works best when it comes to props and application. With a 7x3 the thrust will improve and it wasn't setting any speed records with a 7x4 anyway, just running bad.
Matt, I think .10s run best with 7x3 props. You might find that the engine can be set closer to peak. I've said this all along about .10s VS .15s......they aren't as versatile, they are more specific about what works best when it comes to props and application. With a 7x3 the thrust will improve and it wasn't setting any speed records with a 7x4 anyway, just running bad.
Power is power - airplanes don't fly on torque. 8-4 is the most I would ever fit to a .15, and an 8-3 is about 75% the load factor with 66% the displacement.. go figger. IMHO 8" props are simply too big for .10's, although on a light floaty aircraft they might work decently.
I don't have my .10 fitted to anything right now, but faced with a similar situation I would be looking for 16k+ rpm and some efficiency in the prop, and would fool with 7-3, maybe 7-4, maybe clipped 8-3's. I have one lone old Bartels G/F 7-3.5 Cox clone in my kit (the hot class A/FAI FF prop of yore), one day I'll put that on it or my CX .11. I have flown a few smaller, quick aircraft on .15's with 7-4's and they work great, but in comparison they work like crap on anything large light and draggy.
Being a relatively dormant size range in the grand world of R/C, I assume prop mfgs spend a minimum on R&D and tooling for .10 size props, instead offering a couple of historically standard sizes and have a nice day.
MJD