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Old 22 April 2002, 13:47   #1
Country: UK - Wales
Town: Pembrokeshire
Boat name: MATUKA
Make: Lencraft
Length: 5.5m
Engine: Mariner 60 4s Efi
Join Date: Apr 2001
Posts: 65
Prop size

How do I work out the ultimate sizing of prop for my boat.
I have a 5.5m rib and a Mariner 60hp Efi with the as delivered prop.
Advice please, as size matters I suspect.

Don't go looking for bad weather, it will find you soon enough!
David Perry is offline   Reply With Quote
Old 22 April 2002, 15:55   #2
Country: UK - England
Town: Portishead, Bristol
Boat name: "
Make: Ribcraft, Cowes Mari
Length: 5m +
Engine: Mercury 90hp 4-strok
Join Date: Aug 2001
Posts: 600
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All very complicated - and I'm sure better answers will come but....

Basicly get a prop that will give the recomended engine RPM (as found in the manual) at WOT (Wide open throtle)

I think it also depends on purpose - top speed (racing) vrs. acceleration (ski-ing) etc

Also Alloy vrs Stainless Steel is another debate!!

have you tried "searching" the forum - often very usefull!

jools is offline   Reply With Quote
Old 22 April 2002, 16:44   #3
Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,815

run it and see what revs you can get - then come back on with the revs and the prop pitch you have at present. I am sure the lads (& lasses) on here will sort it out for you
Dave M
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