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12-22-2014 06:11 AM  5 years ago
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rc400

rrNovice

San Francisco Peninsula, California, USA

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E640 Motor for 6s ?
Hello all,

I've purchased a Century E640 Radikal for sport flying. I plan on equipping it with 620mm blades and 6s batteries. What motor specs should I look for when choosing a motor? I've talked to Century and was told to pick a motor based on the manufacture's recommendation.

I've got a KDE XF600-1100kv now and will have an Align 730MX-850kv shortly. The only motor advertised for a 650 size helicopter is a KDE 600XF-1100 G3. The difference is about 275 watts continuous between the two KDE motors which is less than ten percent of the total. 3050 vs. 3325.

Depending on the choice of motors, which pinion should I use to keep a moderate head speed which is not too high?

Thanks in advance.
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12-23-2014 04:24 AM  5 years ago
don s

rrElite Veteran

Chesapeake, VA

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V x kV x pinion teeth x 1 / main gear teeth = max theoretical (100%) headspeed

V x kV x pinion teeth x .9 / main gear teeth= 90% of max headspeed

etc.
E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.
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01-02-2015 02:37 AM  5 years ago
D Pedersen

rrApprentice

Rycroft .Alberta .Canada

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I am not sure what you want for an esc but using a castle with the castle governor your 850KV Align motor with the helical gear set and a 12 tooth pinion on 6s would give a max headspeed of 2059 which for sport flying I would say is lots and with 620 mains and 6s is asking a lot from your battery. So you should have a nice range from about 1750 to 2059 with that setup . The almost same head speed (2036) can be had with the stock main gear and an optional 13 tooth pinion and the 12 tooth gives a max of 1879 rpm.
Hope this helps. You will have to open up the bellcrank mount some with a dremel to fit the motor but it should work fine.
Logo 550SX / Logo 600 / Specter 700 / V Control
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01-05-2015 10:55 PM  5 years ago
rc400

rrNovice

San Francisco Peninsula, California, USA

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Radikal E640
Thanks for you help. It will be a great starting point.

Keith
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