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HomeAircraftHelicopterHelicopter Main Discussion › belt vs shaft?
11-01-2013 12:07 AM  4 years agoPost 41
mustang67ford

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Central Pennsylvania

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Just about every heli i have is belt. I have 1 electric 450 with a shaft drive. However, i am working on a gasser build with a shaft drive, something different.

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11-01-2013 12:44 AM  4 years agoPost 42
Justin Stuart (RIP)

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Plano, Texas

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My MSH Protos sent me back running to TT. That's a nice idea design but in RL too much drag.
You didn't like how quiet the Protos is?

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11-01-2013 01:52 AM  4 years agoPost 43
ICUR1-2

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Ottawa, Ontario

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I would rather have an efficient rattle can, Actually because of the Protos. I stay away from most belt systems.
Like SAB I shudder when I look at the design, IMO it's overbuilt just to be able to employ a belt in the drive system, A place where a helical gear would have sufficed.
The design Idea would be more practical for I.C. powered models VS electric which is smooth in comparison.

spending time, paying attention

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11-01-2013 02:24 AM  4 years agoPost 44
BobOD

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New York- USA

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The design Idea would be more practical for I.C. powered models VS electric which is smooth in comparison.
Interesting thought. The first helis, Nitro of course, were belt driven. That was quite a while ago.

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11-01-2013 02:47 AM  4 years agoPost 45
ICUR1-2

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Ottawa, Ontario

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they were trying to reduce vibrations "hirobo' using a belt for the engine.
I'm surprised they stopped developing the idea for gassers where as the engine needs vibration dampening.

spending time, paying attention

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11-01-2013 03:05 AM  4 years agoPost 46
Justin Stuart (RIP)

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Plano, Texas

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A 4-stroke gasoline engine mounted on big rubber dampeners connected to the main gear by a large cogged belt would make a lot of sense from a vibration perspective, but only for an industrial-type helicopter.

I like these new belt-driven hihg-performance electric helicopters because they are exceedingly quiet, but I agree that the same effect could have been achieved using some helical gears and a torque tube.

I went through a phase where I absolutely HATED belts because I would have them either snap or get balled up in the corner of the tail gearbox causing a "spiral of death", but when the Protos 500 came along and I heard what a nearly silent helicopter is like, I began to appreciate belt driven helicopters--but only if they are designed right.

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11-01-2013 03:09 AM  4 years agoPost 47
RM3

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Killeen, Texas - USA

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...idea for gassers where as the engine needs vibration dampening.
this is probably why gassers that use the RC style magneto engine seem to vib a bit less cause the heavy flywheel dampens the vibs and smooths out the torque pulse a bit more...If they went to belt drive from the engine to the main gear, I wonder if that would help the vibration issue more so...or could it lead to the slinky effect and resonate making thing worse at certin RPMs?

showing a preference will only get you into trouble, 90% of everything is crap...

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11-01-2013 03:11 AM  4 years agoPost 48
BobOD

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New York- USA

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I haven't had a belt fail on my belted helis in quite a long time. I still don't care much for them.
A quiet heli doesn't really impress me either. Different strokes is all.

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11-01-2013 04:20 AM  4 years agoPost 49
ICUR1-2

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Ottawa, Ontario

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If they went to belt drive from the engine to the main gear, I wonder if that would help the vibration issue more so...or could it lead to the slinky effect and resonate making thing worse at certin RPMs?
If the engine is mounted on isolation blocks the belt would allow flex in drive train.

I can Appreciate all aspects of design engineering that's why the Protos interested me at first.
I have a 500 pro fbl with helical gears and they almost same noise level and runs cool compared the Protos
Between the 2 they get the same run time

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