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Guest Jonny

prop size for a calypso

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Guest

rite the fellow egg heads need some help1 yikes :o

when grayham told us that instead of a 2to1 ratio gearbox the previous owner has put on a 3to1 the prop we have on now is B****S so we need to find out a prop that will fit and a different pitch to give us some performance due to the 3to1 ratio gearbox

what we need to know it how big a prop can we get in there and how do we find that out without taking her out the water?

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Guest

has anybody heard of a company i think its called Brim Blow in stallham if so does anybody have there number plz

cheers Jonny

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Guest
Engine

RPM

Gear

Ratio

Propeller

Pitch

Propeller

Slip

Speed

MPH

OMG now your showing off man.

contacted Pacific cruisers at Loddon talking to Richard and he said he has an 22x18 on his calypso.

waiting to hear from Herbert Woods.

Brambelow said 18x18

but we want to go for the biggest prop we can swing in. as we don't want to mess around be on hardstanding more than we have to the less time wasted the more money we keep :-D

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contacted Pacific cruisers at Loddon talking to Richard and he said he has an 22x18 on his calypso.

Does his have the same engine and a 3:1 box Jonny, otherwise it's all meaningless to you.

The prop calculator is a good place to start, you know the revs at maximum so can insert that, you know the gearbox reduction so you can enter that, I suggest you enter the speed a 9mph which is about max displacement speed for a boat of your size and say 10% prop slip and it will then give you the pitch.

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Guest

i thin Richard did say he had a 3to1 reduction gearbox on his but he was hardly getting any revs but we not getting any performance.

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Might be worth having a word with Steel Developments Jonny, props is all they do and the are very good, they may even be able to Re work your prop for you at a lot less than a new one.

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