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Old 12-11-2013, 01:50 AM   #2
Dennis V
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Originally Posted by andy120 View Post
Working from Motocalc i have come up with 2 motor/gearbox sets for my 69" BT spitfire driving a near scale 16.2" prop.
Scorpion S2-5525-210KV at 1.25:1 and a Scorpion HK5020-450KV at 3:1.
Is there a prefered ratio region?

Many thanks
Having gone through a number of Astroflight brush type geared motors, and the pain in the they represent, can you simply go to a direct drive motor?

I've got a $$$$ Hacker A50-16S motor that turns a 16X12 APC-E prop direct drive from a 6S2P A123 battery pack. That A123 battery pack would be close to a 5S 4000 Mah LiPo. Perhaps other less costly motors can also do the job? This A50-16S motor turns my 16X12 prop at about 6000 RPM while pulling about 55 Amps, and 1000 Watts.

Hacker has a number of different motor "winds" on the same size motor frame for use with different number of cells in your battery pack.

Retired and the days are just too short, busier than ever!
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