Gyroguru

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

Gyroguru

Pics of the Motor

Wahid

Gyroguru

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

Flypaper 2

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.

Matt Kirsch

My Feedback: (21)

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.

Gyroguru

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

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

Thanks

Wahid

Flypaper 2

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.

Gyroguru

Should I use 2 cell or 3 cell?

Thanks

Flypaper 2

three cells to get the 11.1 volts.