Centrifugal clutch and starting method

  • Rich griff
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06 Feb 2022 14:33 #1 by Rich griff
Centrifugal clutch and starting method was created by Rich griff
This is an initial info gathering excercise at the moment.

I could never afford an RC helicopter back in the day, and my catalogues of the period are well out of date.

I have a g/fibre perkasa kit in the loft which is the only IC powered boat subject that interests me.

Ideally a petrol powered recoil start marine motor with a centrifugal clutch would be good.

Where could I search for helicopter parts please ?

I have a merco 61 marine engine that could be "petrolised" but would need a centrifugal clutch.

I have mulled over even an electronic magnetic clutch, they have been used on car fans, so could handle the power transfer...

I have even thought if glow/petrol powered electric generator powering an electric motor etc.....maybe too much to go wrong.

An electric start system would also be nice, but complex.

I did make a pull start device similar to that on top of a seagull o/b motor, whulich did work ok.

Weight has to be watched but will make a trailer when the time comes.

So, best place to look at/for modern helicopter IC parts please ?

All help greatly appreciated.

Thanks
Thanks: Klipkopwildlife

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06 Feb 2022 15:39 #2 by Eric
Replied by Eric on topic Centrifugal clutch and starting method
Best place would be Motors and Rotors, if they are still going.
Are you asking for boat parts, or heli parts, you have mixed up two different threads!
Viscous clutch - too heavy.
Pull-start clutch, works a bit like a bicycle freewheel, a ball-bearing in a taper with a stop. free-wheels forwards, but jams backwards (ie on the pull-start).
Car fans are not electromagnetic, they're viscous. Too heavy for your purpose.
Merco engines - are torquey, but low-revving. Wouldn't be right for an MTB!
I/C engine driving a genny to drive a motor - that's been done - as you say - too complex other than as an academic challenge. All Main-line diesel loco's are electric, the engine drives a genny that drives the traction motors.
What's the trailer for?

if you are calm and collected when all about you are going berserk - you've missed something important!
Thanks: Klipkopwildlife

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06 Feb 2022 16:14 - 06 Feb 2022 16:16 #3 by paul d
Replied by paul d on topic Centrifugal clutch and starting method
What you need is a centrifugal clutch from a 1/5th scale rc buggy, or get your wallet out and buy a Zenoah boat motor, comes with a pull start and clutch.

balsa is best.
Last edit: 06 Feb 2022 16:16 by paul d.
Thanks: Klipkopwildlife

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06 Feb 2022 17:58 #4 by Quorneng
Replied by Quorneng on topic Centrifugal clutch and starting method
Rich
Most RC boats do require some sort of reverse capability. A bit more 'mechanism' to think about.
There is a danger you will be adding complexity and weight that might make it an expensive option.
Thanks: Klipkopwildlife

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07 Feb 2022 09:23 #5 by Rich griff
Replied by Rich griff on topic Centrifugal clutch and starting method
Thanks guys...yes, an involved solution...

Would love to just buy a ready made option....I don't have enough jam jars for that...

Viscous now but in the past an electronic clutch was used.

Air con compressor in car uses electro clutch I think, but I cannot touch the one on the car as it's needed...

A reverse on the boat, could/would be needed at some point, sods law says so...

Car clutch, motors and rotors, will check them out...

I hope the guy showing interest in the huntsman and sea commander actually buy them so I have some funds for the pakasa...

Trailer, cos it's a large heavy model boat. The trailer may have to have a crane as well...
Thanks: Klipkopwildlife

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07 Feb 2022 09:38 #6 by Klipkopwildlife
Replied by Klipkopwildlife on topic Centrifugal clutch and starting method
Stay away from Aircon clutches, they draw about 10amps at 12volts!

Do it now, you may never get another chance
Thanks: Rich griff

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