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Old 19 October 2012, 03:11   #1
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Country: UK - England
Town: solent
Make: morbass
Length: 5m +
Engine: 55hp mariner
Join Date: Mar 2007
Posts: 122
hi,

does any body know the stadard size prop on a 55hp mariner 1987 ??.

thanks andy
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Old 19 October 2012, 08:17   #2
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
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Posts: 4,671
No idea of the official size but my Yam version had a 14"...
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Old 19 October 2012, 15:58   #3
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Country: UK - England
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Length: 5m +
Engine: 55hp mariner
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thanks

Quote:
Originally Posted by 9D280 View Post
No idea of the official size but my Yam version had a 14"...
can you tell me the other numbers ??, no numbers on ours and im no prop expert!. lol

cheers andy
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Old 25 October 2012, 13:31   #4
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,671
You sure? The two usual places to put the details are along the outside of the hub, or stamped into the end.


From memory there are 2 versions of props for that engine - the "standard" K series and one that was sold as something like a "speed" prop (I forget the designation letter - someone like Uncle Al might be able to fill in) but the "speed" prop was essentially a smaller diameter higher pitch blade, the idea being a small, light boat doesn't need so much "grip" so by using a smaller diameter prop, thee was less "prop drag" and so the engine could spin faster, and it was "loaded back up" by upping the pitch for more speed.

Mine had a speed prop on when I got it, and it let go at the slightest provocation (Open throttle, biggish wave......)
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