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What size prop should I use

Old 07-07-2011, 07:55 AM
  #1  
karolh
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Default What size prop should I use

I have a 39" span Extra 260 with 330 sq. ins of wing area from Value Hobby with a GForce G450 (28-30-1120KV) motor. It weighs 36 ounces and I would like to use the model for mild sports/ aerobatic flying, but would like some suggestions as to what size prop I should use.

Karol
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Old 07-07-2011, 04:10 PM
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rcers
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I would start with a 9x6 prop and see what your amp draw is... I suspect that motor will be very much "sport" power for that model so don't expect it to pull the wings off.

Mike
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Old 07-07-2011, 06:49 PM
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karolh
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Originally Posted by rcers View Post
I would start with a 9x6 prop and see what your amp draw is... I suspect that motor will be very much "sport" power for that model so don't expect it to pull the wings off.

Mike
Thanks Mike, will try your suggested size prop and go from there if necessary.

Karol
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Old 07-07-2011, 11:26 PM
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TopSpin
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I woud go with an APC 10X5E prop if I were you. The E450 is rated up to a 10X6 prop so if you have at least a 30 amp ESC I would not hesitate to go to a 10X5 prop.
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Old 07-08-2011, 12:34 AM
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karolh
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I do have a 10x5 prop, so I will give that a try first and see how the model performs. Do electric motors need an outlet in the bottom of the cowl for cooling air to escape like glow/gas engines do.

Karol
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Old 07-08-2011, 12:45 AM
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bbqflyer
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Karolh, it's not absolutely neccessary to have an outlet, but it would be helpful. It too would allow the motor to run cooler and run more efficiently. But for prop size, I would definitely start with a 10x5 and go from there.
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