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HomeAircraftHelicopterHelicopter Main Discussion › Why no clutch on electrics?
09-08-2013 02:40 AM  5 years agoPost 21
Santiago P

rrProfessor

South West, Ohio

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A clutch can be designed to handle any amount of torque, an electric motor can be made to produce any amount of torque and a Nitro engine can be designed to produce any amount of torque.

The answer is really much more simple, an electric motor has no need to idle...thus no clutch needed.
Exactly.

One more thing...Once they're spooled up,the clutch never slips.

If an electric motor did something crazy enough in flight to make a clutch fail...it would strip the main gear without the clutch.

That clutch is just as reliable in flight as a pinion gear/plastic main gear combo.
Well said ^^^ Bob and Ernie

Further more, you can adjust the governor gain on many ESCs to come on harder, or softer on the RPM variation and provide a fast, slow, smooth, or hard catch-up.

The only place where I seen a clutch be a plus is on some scale machines where the sound of the motor winding up before the blades creates a really cool scale sound effect.

Santiago

Team Minicopter - PeakAircraft.com
bavarianDEMON- Team Kontronik - Scorpion Motors-

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09-08-2013 02:48 AM  5 years agoPost 22
McKrackin

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Lucasville,Ohio

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Throughout the past few years,something that has always confused me...

Look at the history of the Trex 700 and similar helis.
Even with the extra power that electric produces,it's the nitros that have stripped the most main gears.

Even when both are equipped with Mod 1 gears...it's the nitros that strip the most main gears.

The clutch is FAR from being the weak link in a drive train.

I literally never use the word literally right.

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09-08-2013 05:55 AM  5 years agoPost 23
BobOD

rrElite Veteran

New York- USA

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I don't know about that. I've seen many electrics strip gears, more than Nitros I'd say.
But, it's not apples to apples anyway.

The electric uses a smaller pinion/higher ratio. Less efficient - generates more heat in the gear.

The electric motor puts more heat into the pinion. The output shaft on a Nitro is liquid cooled.

And, a lot of failures are caused by the erratic torque that happens when there are commutation errors due to the high noise levels under heavy loading. Yes, as noted, people are learning to not run such high gains so this has been improving.

The Nitro produces one pulse per rev but it is a relatively long pulse. The electric produces many much shorter pulses.

Kind of difficult to compare the two.

As for the clutch, it may very well handle the electric better. Doesn't care as much about heat, would be spinning faster and the inertia of the clutch would smooth out torque spikes from the motor. But, I don't see the point. Unless it's for the scale effect of course.

Team POP Secret

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09-08-2013 03:54 PM  5 years agoPost 24
qraptor

rrApprentice

Illinois

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Even when both are equipped with Mod 1 gears...it's the nitros that strip the most main gears.
The clutch is FAR from being the weak link in a drive train.
That is a good observation.

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09-08-2013 04:08 PM  5 years agoPost 25
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Electric helis inside scale fuselages look and sound better with a clutch beacuse it mimics a turbine startup.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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09-09-2013 03:44 AM  5 years agoPost 26
Flys4Fun

rrApprentice

new mexico

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i did not ask this question because i dont know better. clutches dont lock up with no slippage, ever seen a nitro hot start on the bench at full throttle? yu can still hold the head from spinning and the motor is at wot. anyways, thanks for the thoughts, i still think electrics can benefit from clutch on the safety side of things and i would like to not have to a new main gear for most crashes, for over a decade i never broke any mains gears on my nitro, likely due to the fact that he power from the motor was transmitted through a clutch.

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HomeAircraftHelicopterHelicopter Main Discussion › Why no clutch on electrics?
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