The Shipyard ( Dry Dock ): Builds & Questions > Pleasure boats, Sports, Race, Power and Leisure Boats:

Rev limit for belt drive?

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tonyH:
I'm well out of my comfort zone here but I'm contemplating a sort of Z Drive using a short belt to transfer the power at 1:1 from the line of the motor shaft to the line of the prop shaft which should(?) be parallel to each other and no further than 5cm apart.
It's probable that the system would run at around 100 watts from a brushless motor.
Has anyone any experience of using a belt drive at higher revs?
With hope and thanks in anticipation %)
Tony

derekwarner:
Tony...again nothing like looking at the belt manufacturers data sheet....they will probably have a few questions or variables in providing your answer


power to be transmitted
proposed rpm
diameter of pulleys
center distance between pulleys ...etc


Derek

tonyH:
Thanks Derek and I totally agree that that's the starting point but when the book says max 40,000 revs or 80 metres per second for, theoretically, an 8mm wide steel reinforced timing belt on 10mm diameter pulleys, one starts to consider the b****r factor of what safety factor should be built in and what happens in the real world with start-up torque etc!
I don't want to go down the road of destruction testing this early in the design stage %%
Cheers
Tony

derekwarner:
Tony....


Are you considering an IC engine?..if not....the maximum drive speed [surface belt speed per unit of time] can be electronically controlled on startup


What profile belt are you considering XXL, XXXL?
With the power to be transmitted [0.1kW], is a steel reinforced belt required?


Polyurethane elastomer toothed belts with Kevlar reinforcement have a far higher surface speed rating together with comparable power transmission capability


Derek

tonyH:
Hi Derek,

I'm waiting for a new copy of the HPC Gears catalogue. I've used them in the past for getting the revs down and the torque up(!) and the quality is very good.
What I'm aiming for is a variation on a Z-Drive (2 off) with brushless so start up can be more gentle but...

I've looked at the commercially available stuff but I refuse to fork out £300.00+ for an experiment so I'm going back to first principles :-))

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