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Which battery for Trex 550E Pro DFC... beginner pilot.

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Which battery for Trex 550E Pro DFC... beginner pilot.

Old 03-11-2014, 05:27 PM
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RS2K
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Default Which battery for Trex 550E Pro DFC... beginner pilot.

My uncle just bought a Trex 550E Pro DFC. It has a 730MX 850 KV motor and a 1:7 gear ratio. What kind of battery should he get for it? He's new to flying and is still in the hovering stage with a blade 450. This is obviously a very hot heli, what can we do to keep it tame?


I was thinking it needed a 6S 5000 mah lipo, but I did a quick calculation which doesn't seem to make sense to me.
4 volts * 6 cells * 850 KV = 20400 RPM / 7 = 2914 RPM... I can't imagine a 550 turning at that kind of head speed. I was thinking 1800 - 2000 was a lot more reasonable. I haven't been into helis since 2008 (Getting back in shortly) so maybe my calculations are missing something.
Old 03-12-2014, 03:23 AM
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I'm using 5000mah, 6s, 30c batteries. I've set my governor at 85% max rpm. It flies like a dream. Very stable.
Old 03-12-2014, 07:49 AM
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Thanks!

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