Left handed or right handed max prop - Page 2 - SailNet Community
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post #11 of 16 Old 03-01-2013
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Re: Left handed or right handed max prop

I would never start the motor on the hard, but it is done. I think Med was only suggesting a tweak on the starter with the transmission in gear to see which way the prop turns. If you literally hit it for a split second, an observer should see which way it starts to turn. However, I would be a bit concerned about the starter turning the transmission. I guess we've all done it accidentally in the water, but it's probably not good for the starter or transmission. Just a gut.

Sounded like PYI gave the decoder to checking it anyway.


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post #12 of 16 Old 03-01-2013
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Re: Left handed or right handed max prop

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Originally Posted by Minnewaska View Post
I would never start the motor on the hard, but it is done. I think Med was only suggesting a tweak on the starter with the transmission in gear to see which way the prop turns. If you literally hit it for a split second, an observer should see which way it starts to turn. However, I would be a bit concerned about the starter turning the transmission. I guess we've all done it accidentally in the water, but it's probably not good for the starter or transmission. Just a gut.

Sounded like PYI gave the decoder to checking it anyway.
Exactly. Step two, having the stop lever pulled out (and giving it no throttle) will keep the engine from starting. You only need 1/2 a turn of the prop to answer your question.

Electric motors (starters) are very robust. The higher amperage draw from the extra force required to turn the prop might heat up the windings if you cranked it for 30 seconds or more, but I was talking about 3 seconds or less. You're not going to break anything doing that.

I watched a boat broker crank on the starter while in gear and actually start the engine on another Formosa 41 while it was in gear. He was wondering why it was suddenly pulling on his dock-line so hard. No harm done to the starter.

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post #13 of 16 Old 03-02-2013
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Re: Left handed or right handed max prop

Sort of related... you could just turn the engine with the hand crank... but a warning.

A friend was using an old rusty handcrank to roll the engine over.. not intending to run it.. it caught on its own and the handcrank didn't disengage.. not much room in a Santana 30/30 to avoid the now spinning crank! Luckily after a few seconds it spit itself free without injury and he was able to pull the kill switch.

Sometimes diesels just want to run!....

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post #14 of 16 Old 03-03-2013
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Re: Left handed or right handed max prop

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Originally Posted by brokesailor View Post
I want to change the pitch of my max prop. Is there an easy way to figure out if the it rotates left or right with the boat hauled out? The PO says it's a left handed prop but I would like to make sure.
Think of the prop taken off the shaft and lying on the ground.

Think of it sitting on its forward face. If you can envisage standing over it, whichever hand can pick it up with your palm facing your foot, will show which rotation the prop is.

A Right handed prop rotates clockwise, and a Left handed prop rotates anti-clockwise.

A right handed prop will kick the stern to port going astern, and a left handed prop (as is mine) will kick to starboard when going astern.

The boat will turn to starboard quicker when going ahead with a right handed prop, and to port with a left handed prop.

(sorry, didn't read the OP properly before replying. My answer is for a fixed blade prop, not a Max Prop - though my answer is possibly the same.)

regards,
Philip.

Last edited by PhilipStevens; 03-03-2013 at 08:46 AM. Reason: should have read it properly before replying!
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post #15 of 16 Old 03-03-2013
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Re: Left handed or right handed max prop

I've taken my max prop apart so many times over the years that I should be able to tell you which way the blades turn. So it you can't determine the rotation of your shaft then look at the prop when completely feathered. The blades should have the curved part aft. Now turn the prop clockwise....I know that the blades rotate such that the curved parts are now forward.....and I have a right hand prop. I really can't remember how the blades rotate when I rotate counterclock wise but I would think those curve sections would be aft......Someone can correct me on this, but I'll be at the boat in the next 2 weeks and can give a definate answer if needed.
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post #16 of 16 Old 03-03-2013
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Re: Left handed or right handed max prop

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Originally Posted by lancelot9898 View Post
I've taken my max prop apart so many times over the years that I should be able to tell you which way the blades turn. So it you can't determine the rotation of your shaft then look at the prop when completely feathered. The blades should have the curved part aft. Now turn the prop clockwise....I know that the blades rotate such that the curved parts are now forward.....and I have a right hand prop. I really can't remember how the blades rotate when I rotate counterclock wise but I would think those curve sections would be aft......Someone can correct me on this, but I'll be at the boat in the next 2 weeks and can give a definate answer if needed.
That's the beauty of the Max Prop.. the blades rotate fully around in reverse so that the blades still work in the 'designed' forward direction. Prop blades have a foil-shaped cross section.. with a fixed prop in reverse, everything's working 'backwards' (inefficiently) when you're backing up.

When you turn the PROP CW and the prop goes into reverse orientation (curve forward), it means when the SHAFT goes CW the prop blades go into fwd position = RH rotation.

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