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WHICH MOTOR FOR MAX THRUST WITH GWS 8x4" HD PROP?

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WHICH MOTOR FOR MAX THRUST WITH GWS 8x4" HD PROP?

Old 08-07-2005, 11:45 AM
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Default WHICH MOTOR FOR MAX THRUST WITH GWS 8x4" HD PROP?

I am building a autogyro with brushless motor & Li-po. My design limits me to a 8" prop. The weight is going to be around 15 oz. or less and I am not going to be doing any 3D stuff.

I was thinking about the LittleScreamer outrunner with Kokam 3 Cell 11.1V 1250mAh Li-po.

http://littlescreamers.com/ls1/products.html

What is the best motor to get maximum thrust out of GWS 8x4 HD Propeller?

Wahid

Thanks
Old 08-07-2005, 11:53 AM
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Default RE: WHICH MOTOR FOR MAX THRUST WITH GWS 8x4" HD PROP?

Pics of the Motor

Wahid
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Old 08-07-2005, 01:02 PM
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Default RE: WHICH MOTOR FOR MAX THRUST WITH GWS 8x4" HD PROP?

The autogyro I want to build is similar to this. My autogyro will not use Heli head but a regular direct control head which is much lighter. Thanks. Wahid

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Old 08-08-2005, 09:12 AM
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Default RE: WHICH MOTOR FOR MAX THRUST WITH GWS 8x4" HD PROP?

Wahid:
Little screamer should work fine. You should be able to get away with a lighter batt pack, I use 830s on that motor and get 15 mins run time. I was thinking of building an autogiro too but hopefully come out at around 10 oz.
Old 08-09-2005, 07:49 AM
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Default RE: WHICH MOTOR FOR MAX THRUST WITH GWS 8x4" HD PROP?

I agree. 1250mAh is overkill. The smaller pack should cut your battery weight in half, so the plane will come in at around 13 ounces.

You'll need the most power you can get out of the motor. According to the charts at Todd's Models, an 8x6 prop is a good match for the motor and a 3S LiPoly. That'll give you 71 Watts. On a 13 ounce plane, that's 87 Watts per pound. Should be more than adequate for an autogyro.
Old 08-09-2005, 10:23 PM
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Default RE: WHICH MOTOR FOR MAX THRUST WITH GWS 8x4" HD PROP?

How many mAh pack should I use? 2 or 3 cells?

I want to get atleast 5-8 min of flying time.

Thanks

Wahid
Old 08-09-2005, 10:36 PM
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Default RE: WHICH MOTOR FOR MAX THRUST WITH GWS 8x4" HD PROP?

Around 800 ma would be fine. I wouldn't go any lower, as the batt. may not be able to handle the amps motor is taking out of it.
Old 08-10-2005, 04:17 PM
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Default RE: WHICH MOTOR FOR MAX THRUST WITH GWS 8x4" HD PROP?

Should I use 2 cell or 3 cell?

Thanks
Old 08-10-2005, 07:48 PM
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Default RE: WHICH MOTOR FOR MAX THRUST WITH GWS 8x4" HD PROP?

three cells to get the 11.1 volts.

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