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Old 10-05-2012, 09:16 PM   #101
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What about complication, potential for failure, and additional burden of maintenance cost? Are they 99.99% reliable?
Well, they aren't on the Washington State ferries.

I suspect that the size of props needed to move boats like ours and the power it takes to move them would not lend itself to the use of a simple folding prop where inertia holds it out under reverse. I have seen this kind of prop used on the get-home shafts of Nordhavns in the Seaview Yard but they are very small like the sailboat props.

My guess is that to provide variable pitch and feathering for a boat like ours the prop's pitch mechanism would have to be some sort of a mechanical system either electronically controlled or manual. And this would for sure add to the elements Mark speaks of.
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Old 10-05-2012, 09:21 PM   #102
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They are out there....

Max-Prop 4 Blade VP Fast - 126mm Hub - 30"
[max126430F] $13,205.00
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Old 10-05-2012, 09:38 PM   #103
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They are out there....

Max-Prop 4 Blade VP Fast - 126mm Hub - 30"
[max126430F] $13,205.00
So, high initial cost vs. fuel savings. I'm waiting for someone to calculate the return on investment crossover point.
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Old 10-05-2012, 10:25 PM   #104
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Originally Posted by markpierce View Post
What about complication, potential for failure, and additional burden of maintenance cost? Are they 99.99% reliable?
Proven technology used on thousands of boats for a great many years. Hardly a new design.
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