Replacing a brushed geared motor
09-16-2009, 09:47 PM
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Replacing a brushed geared motor
I havea Goldberg Endurance sailplane with a brushed 400-480 motor and inline gearbox. The motor is 28mm in diameter and the gearbox uses a 4mm shaft and spins an 11.5 inch stock folding prop. I have been using a 1350 mah 11.1 v 15c pack. I would like to use a brushless motor without the gear box if possible but I am concerned about trying to fit an outrunner into the pinched nose of the fuse. The current motor is mounted behind a front-mounted firewall with two screws tightened into the front face of the gold gearbox. Length of the can is not important I have space.
Any suggestions?
Dan
09-17-2009, 10:57 AM
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RE: Replacing a brushed geared motor
It is hard to find a 28mm inrunner of sufficiently low Kv to be suited to an 11.5" prop. Off the top of my head an ARC 28-47-3 (~1460Kv) is getting close, but even with only a 10x5 prop it will draw ~34A on 3s. That would certainly give your plane plenty of get up and go, but you'd need a far bigger pack. Maybe someone makes an 1100-1200Kv 28mm brushless inrunner?
Ah yes, Mega does: Ac16-25-4 (1250V), Ac16-25-5 (1100Kv), Ac16-25-6 (900Kv)... but if you adhere to the possibly conservative Mega specs, the -4 and -5 are limited to 25A and the -6 to only 15A... that would mean you'd have to run 2s to keep the amps within their limits.
Ah yes, Mega does: Ac16-25-4 (1250V), Ac16-25-5 (1100Kv), Ac16-25-6 (900Kv)... but if you adhere to the possibly conservative Mega specs, the -4 and -5 are limited to 25A and the -6 to only 15A... that would mean you'd have to run 2s to keep the amps within their limits.
