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Old 06-02-2015, 02:45 AM   #1 (permalink)
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Default Hyperion 880KV motor

Hey guys I'm building a T-rex 500 scale bird and going to run a 5 bladed rotor head, running on 6s 3300 mah batteries with a 12T pinion, is a Hyperion 880 kv motor sufficient enough to spin the 5 bladed head or should I go with a 1210 kv motor ? Mahalo in advance !
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Old 06-02-2015, 04:41 AM   #2 (permalink)
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Scale does not need a lot of power. The headspeed is more important. I run a 1300kV motor with 12T pinion on 6s on a 500 sized 2 blade UH-1N. It runs at 1700rpm, and uses about 400W which is a fraction of the motors power output.

Assuming you have an older 162T main gear (which you may not);

RPM = 880 x 22.2 x 0.9 x 12T / 162T = 1302rpm at 100% towards the end of the flight.

This would be too slow for even a 5 blade 500, so I am thinking you must have a different main gear - maybe 121T, which would give 1743rpm at 100%, so you could run around 95% governor and get 1650rpm, which should be fine for a 5 blade.

Colin
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Old 06-02-2015, 04:25 PM   #3 (permalink)
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Thanks Andy01, yah im running 162T on the main gear I thought the 880 kv motor would be to slow I just wanted confirmation, the price was a little cheaper I guess I'll go with the 1210 KV motor and Govern it down

Good day mate !
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Old 06-03-2015, 02:24 AM   #4 (permalink)
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Can you get an 18T pinion ?

A 1210kV should work just fine.

Colin
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