Prop shaft ratio

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5 years ago

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madjpc

1 posts

madjpc

1 posts

25 Nov 2020 5:00pm

I have a buhk 20 in 32ft yacht. I have lost the prop. Measuring in the water which is not ideal I make the ratio out to be 1:12 on 1 inc shaft. It is a Swanson so Australian. Does that sound ok as apparently not common in aus?

Jolene

1624 posts

Jolene

WA, 1624 posts

25 Nov 2020 6:48pm

1:16 is the sae taper for a 1" dia shaft
Small end of taper is .828"
Length of taper is 2.750

You could have 1:12 ,, you never know with props

troubadour

NSW

335 posts

troubadour

NSW, 335 posts

26 Nov 2020 2:59pm

1:12 is the taper for a shaft in a commercial vessels. Glenn at DH Porter Propellers is the man to talk to

Jolene

1624 posts

Jolene

WA, 1624 posts

27 Nov 2020 10:09am

If a 1:16 prop was fitted onto a 1:12,, that may be the reason you now have no prop

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Prop shaft ratio

madjpc

Jolene

troubadour

Jolene

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