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Old 22 May 2011, 17:41   #1
Country: UK - England
Town: gravesend
Boat name: curach/Earl
Make: seago/Lifeguard 4M
Length: under 3m
Engine: 3.3 marinar/10 hp
Join Date: Jul 2008
Posts: 802
Prop or more serious?


Took the Earl out sat ,with yet another second hand outboard ,prop right jaggered up,so going at 6 odd knotts opened her up ,get acceleration,start to pick up, then horrid vibration,i throttled down,me thinks not just the prop,more like gears,oh dear what have i brought now?would the prop be the reason for this?can t believe its just a roughed up prop?no expert mind, just something not right?

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Old 23 May 2011, 02:19   #2
Peter_C's Avatar
Country: USA
Boat name: Uh...a kayak?
Length: 4m +
Join Date: Dec 2009
Posts: 1,485
If the prop is damaged, it could easily cause a nasty vibration. I have seen an inboard with a slightly bent 3 blade cause the boat to shake badly at anything over 2,000 rpm. Get a good prop and test it again.

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Old 23 May 2011, 02:20   #3
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Poly's Avatar
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,233
post pictures of the prop - people might be able to guess then. However if the prop is bad enough this will cause the symptoms you described. If it is run like that for long the vibration will then start damaging stuff!
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