Without opening up a discussion on the engine (SB8-Yanmar) being undersized, has anyone had any marked improvement in performance changing the prop. My 75 has its original 2 blade,.....am considering a 3 blade for more thrust and power under motor often have to motor into 10-15'seas and 20 knots of wind more thrust would be helpful.....I am looking for size and pitch recommendations...........Cheers.
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Prop Manufacturers
Contact any of the prop manufacturers and they can give you the proper size and pitch for your boat, engine and transmission. I have been very happy with the Campbell sailer prop - see the link
Contact any of the prop manufacturers and they can give you the proper size and pitch for your boat, engine and transmission. I have been very happy with the Campbell sailer prop - see the link
cambell sail prop
We have a cambell sail prop on our Hunter 29.5 I think that it would be an excellent choice.In adition to working well it backs up like a dream with only a small amount of prop walk.
We have a cambell sail prop on our Hunter 29.5 I think that it would be an excellent choice.In adition to working well it backs up like a dream with only a small amount of prop walk.
Just changed from two, to a three blade prop
My old 1980 Hunter 33 has a just as old 2QM15 engine in it rated at 14 hp. With the old 2 blade prop (before hull painting) the engine would only rev. to 1900. Per the specs the prop was a 14-12. It was a large 2 blade with a square shape. From the best prop shop in the area I picked up a used three blade 13-11. Now with this prop (and newly painted hull) the engine revs. to 2400 and the boat moves at 6.4+ knots and even better 5.2 knots at 1800 rpm. The engine's no load rev. is 2800. It also smoothed out the vibration the drive train had before with 2 cylinders driving a 2 blade prop. I wish I had changed to a three blade prop years ago.
My old 1980 Hunter 33 has a just as old 2QM15 engine in it rated at 14 hp. With the old 2 blade prop (before hull painting) the engine would only rev. to 1900. Per the specs the prop was a 14-12. It was a large 2 blade with a square shape. From the best prop shop in the area I picked up a used three blade 13-11. Now with this prop (and newly painted hull) the engine revs. to 2400 and the boat moves at 6.4+ knots and even better 5.2 knots at 1800 rpm. The engine's no load rev. is 2800. It also smoothed out the vibration the drive train had before with 2 cylinders driving a 2 blade prop. I wish I had changed to a three blade prop years ago.
3 blade prop
Peter: I purchased my 1980 Hunter 27 July 2006. It came with a (replace) 2GM Yanmar engine and it has a 3 blade prop. I found the old 2 blade prop under the Main salon bunk. My engine revs to 3400 RPMs with a top speed of 5.5 knots. Top speed can frequently be achieved at around 2500 RPMs. Mike
Peter: I purchased my 1980 Hunter 27 July 2006. It came with a (replace) 2GM Yanmar engine and it has a 3 blade prop. I found the old 2 blade prop under the Main salon bunk. My engine revs to 3400 RPMs with a top speed of 5.5 knots. Top speed can frequently be achieved at around 2500 RPMs. Mike
Campbell Sailor prop 3-blade
I changed from stock 2-blade to Campbell Sailor prop 3-blade. Mark improvement in thrust but have two distinct problem. 1)Reduced prop kick - now I've to re-learn berthing technique 'cos I can no longer rely on prop kicker. 2)as the Campbell blade is narrow (small surface area) barnacle growth on it has more pronouce impact than the stock larger bladed 2-blade prop. Another benefit with 3-blade is it is quiet running and very quiet when free spinning (under sail).
I changed from stock 2-blade to Campbell Sailor prop 3-blade. Mark improvement in thrust but have two distinct problem. 1)Reduced prop kick - now I've to re-learn berthing technique 'cos I can no longer rely on prop kicker. 2)as the Campbell blade is narrow (small surface area) barnacle growth on it has more pronouce impact than the stock larger bladed 2-blade prop. Another benefit with 3-blade is it is quiet running and very quiet when free spinning (under sail).
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