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Electric General Discussion
› Extreme electric flight times.
06-01-2012 03:05 PM  6 years agoPost 1
Benth

rrApprentice

New London Ct

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So I have seen videos of very long electric flights by pilots running low headspeeds and I have a couple questions. First the pinion, do you run a lower tooth count pinion or keep the normal 3D pinion and run the motor at a lower rpm? My understanding is outrunner motors are more efficient towards the upper end of the're RPM range so do you use a really small pinion and run the motor at high rpm for efficiency or is it better for flight times to keep the stock pinion and just run a low throttle percentage? Second is it better to set up a govenor set to a low speed or again use a low throttle curve(or high one depending on pinion choice)? Thanks for the input guys!

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06-01-2012 03:18 PM  6 years agoPost 2
Darren Lee

rrElite Veteran

Woodstock, GA

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One way is to use a 6S pack instead of the full 12S stick, keeping gearing the same. This cuts the headspeed in half and drops considerable weight with the ESC running at the same throttle percentage.

Team Synergy / Rail Blades / Morgan Fuel

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06-01-2012 03:37 PM  6 years agoPost 3
Darren Lee

rrElite Veteran

Woodstock, GA

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Alternatively, for even longer flight times but without the weight savings, you could use both 6S packs but connect them in parallel. This would solve possible CG issues with dropping a pack.

Team Synergy / Rail Blades / Morgan Fuel

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06-02-2012 08:37 PM  6 years agoPost 4
unclejane

rrElite Veteran

santa fe, NM, USA

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Speaking of that...:

Watch at YouTube

Hmmm... where's my soldering iron......

LS

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06-03-2012 09:08 PM  6 years agoPost 5
Richardmid1

rrProfessor

Leeds, England

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Ive used 1 6s 5000 pack on my Trex 700E and get 8 minute 3D flight times.

The rear pack in my 700E is very nearly directly under the main shaft so removing it changed the c of g very little.

A 6s 3000 pack would be interesting although it would need moving further forward, should give 4-5 mins and the weight saving would improve the pitch response.

To answer the OP's question it is better to reduce the pinion size and keep the throttle above 75%.

60% of the time, it works every time!

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