Propeller RPM

[SlickZERO]

Is there an ideal theoretical RPM for props? I realize different sizes, pitch, or number of blades would mater. Is there maybe a chart somewhere? If I am going to run a 31" mono with maybe a X442 or M442 on 4 cell, I would need to choose a Kv for what target RPM? Hope this makes sense.

[kevinpratt823]

Oh man, here we go LOL.......JK.
There are many different opinions on this, but many would say that, for regular sport running, 30,000-35,000 is a good, safe place to start, as when you get up to 40,000+ there is much less room for error in setup. With a smaller prop like a 442, you can certainly get away with a bit higher rpm's though. IMO, for 4s sport running, 1800-2200kv is a great all around choice, and you could prob even go bigger on prop, depending on size of motor, esc, and batts.

[785boats]

This is a good guide.

[SlickZERO]

Oh man, here we go LOL.......JK.
There are many different opinions on this, but many would say that, for regular sport running, 30,000-35,000 is a good, safe place to start, as when you get up to 40,000+ there is much less room for error in setup. With a smaller prop like a 442, you can certainly get away with a bit higher rpm's though. IMO, for 4s sport running, 1800-2200kv is a great all around choice, and you could prob even go bigger on prop, depending on size of motor, esc, and batts.

I have a Lucas Oil on 4 cell with the stock 1800. So that would be theoretically 26,640 RPM? Runs real good with a X442.

[SlickZERO]

Thanks, that is handy. I see how the range gets narrower as the cell count goes up.

This is a good guide.

[montymike]

Could use a x445/m445 easy if t step up to a m545 (watch your temps.) On bigger prop. Changes.

[SlickZERO]

Thanks, what would be the maximum temp for motor and ESC?

Could use a x445/m445 easy if t step up to a m545 (watch your temps.) On bigger prop. Changes.

[montymike]

Keep mine below 120°after a run.when using a ibigger prop i make a lap or two bring her and check temps. There is people who race this boat with that setup that know the limits of it.