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How slow does a slow-fly prop have to turn?

Old 06-14-2008, 05:18 PM
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ChillPhatCat
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Default How slow does a slow-fly prop have to turn?

I'm looking for a mostly scale 4 blade prop for my 1/12 scale HoB P-51 and I'm going to be running a rimfire outrunner at about 250W max. My question is mostly directed toward the GWS slow-fly 10x8 4 Blade prop which seems to be just about a perfect size for the plane. I'm fairly certain it would be too much to run it without a gearbox, but just how much RPM could I get away with before it breaks up?

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Old 06-18-2008, 10:09 PM
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dcs191919
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6400rpm... I was just reading the rule is 65,000 divided by the diameter. I have spun them much faster than recommended and never had a failure.
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Old 06-18-2008, 10:14 PM
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pd1
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Welcome to Wattflyer guys.


Originally Posted by dcs191919 View Post
6400rpm... I was just reading the rule is 65,000 divided by the diameter. I have spun them much faster than recommended and never had a failure.
That's the formula, I too have spun them faster, but I don't recommend it.

A 10x8 four blade is a lot of load for a small motor. Do a current check to be certain you don't draw too much and smoke something.

Paul
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Old 06-19-2008, 01:33 AM
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ChillPhatCat
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Thanks for the welcome!

I've been running the numbers in motocalc and it's simply impractical to run that prop for this application... it was coming up with about 5000 RPM with 30 oz of thrust and 35MPH prop speed. I found with a smaller motor at 11.1V with a 2-blade 9x6 I could get 25oz of thrust with 50-55 MPH prop speed, along with much cooler operating temps, less weight and less current draw for the same run time. I'll probably go with the second option and use the 4 blade for static display. The challenge now is going to be fitting 6 fully functional channels into this thing. :
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