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Old 20 August 2018, 12:33   #1
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Aeration or spun prop?

I have a Yam 360s with a 6hp mariner 4 stroke.
It planes with me on board but if I try to plane with two on board or in some conditions when I apply full power and the engine is under pressure the revs suddenly increase and drive is lost. I instinctively reduce power and drive returns. Would a spun prop slip when engine under pressure or is it aeration? I guess it could be jumping out of gear but if so engages again without moving the gear control when I close the throttle? Opinions?
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Old 20 August 2018, 12:38   #2
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Unlikely to be gearbox slipping but spun prop or aeration equally possible. Mark prop and hub ready for next time out to check if hub slipping.

On a fairly low power motor like this unless it's suffered repeated prop strikes to stress the hub I'd say a spun hub is less likely than aeration.
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Old 20 August 2018, 13:42   #3
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It's not got a shear pin has it I don't know just mentioning it
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Old 20 August 2018, 14:42   #4
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No the prop has a rubber bushing so if that has failed its a new prop
I had one grounding at low revs which put a tiny ding in the prop
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Old 20 August 2018, 22:03   #5
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Quote:
Originally Posted by billows View Post
No the prop has a rubber bushing so if that has failed its a new prop

I had one grounding at low revs which put a tiny ding in the prop


You can get them repaired for about half the price of a new prop
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Old 21 August 2018, 06:11   #6
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i wouldn't think jumping out of gear as the dog clutch would be grating i am with fenlander aeration, all tubes & keel pumped up, cav plate level with keel or thereabouts trim pin 2nd hole etc. if the rubber bush has gone you should be able to spin the prop in gear by hand if it has gone
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