Hi,
I am still contemplating my electrification project (my diesel refuses to die...)
First question
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For my transmission, can I assume that only the ratio of the pulleys is important, and not their actual dimensions? For example, as far as overall system performance, am I correct in assuming that there is no functional difference between a system comprised of a 3" motor pulley and a 6" shaft pulley, versus one with a 4" motor pulley and an 8" shaft pulley?
I believe that ignoring contact friction losses and inertia of components, that everything resolves to the same, but in practise, what are some of the factors that will determine the pulley sizes? Off-the-shelf availability? Price? Belt flex radius requirements?
Second question
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Are these assumptions correct for many boats:
- prop shaft is parallel to engine stringers.
- prop shaft is within 2" of engine stringer plane.
- cavity between strings will be around 12"
Third question
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Mounting method for motor and belt-tensioning.
How do you guys do it? oblong holes in the mounting plate so you can tension the belt by moving the motor away from the shaft pulley? An idler pulley? I hear that toothed belts don't require as much tension on the belt. Does this mean that hand-tensioning is adequate or is some means of mechanical belt tensioning required?
Thanks in advance for your advice!
Cheers,
/Jason
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S/V Fugu
1978 Beneteau First 30 (hull 206)
have: Yanmar YSB-8 with bad piston rings
want: 5kW electric drive with 10kWh LiFePO4
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