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Author Topic:   Propellor Repair

Dr T posted 08-17-2001 06:45 PM ET (US)
General question: At what point do dings in the propellor start substantially effecting performance? That is, when do you really need to go to the prop doctor?
Case in point: I have a 10 x 13 SS prop for my 1982 35 hp Johnson on my 13' Sport that I used when I had the boat at low altitude in Texas. Along one blade, it looks like an impact has caused the edge to be curled back by about 1 mm. Is this enough to substantially hurt the performance?

MikeC posted 08-17-2001 07:59 PM ET (US)
How fast does your boat go with that prop on there? I just bought a 13 with a 1979 35 hp Johnson and I have an aluminum 10x13 on there now and can hit 30mph with two people and 6 gallons of gas.I was just curious what other people are getting for speed.Anytime your blades are the least bit bent your prop becomes a lot less efficient,I would have it fixed.
Dr T posted 08-17-2001 08:44 PM ET (US)
Did not have a way to tell when the boat was in Texas. 30 sounds pretty good. There was an interesting thread last month on this topic started by The Mexican on this particular setup.
With an 11 x 9 prop, 2 kids, me, two tanks of fuel on board I can hit about 22 MPH at 5000 ft altitude.
Dick posted 08-17-2001 09:16 PM ET (US)
Dr T
An out of balance, bent or dinged prop will affect your performance.
The biggest problem is vibration, you may not feel it but the prop shaft seals and bearings sure do. Running a well balanced prop is one of the most important things you can do for your motor.
Dick

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Author	Topic: Propellor Repair
Dr T	posted 08-17-2001 06:45 PM ET (US) General question: At what point do dings in the propellor start substantially effecting performance? That is, when do you really need to go to the prop doctor? Case in point: I have a 10 x 13 SS prop for my 1982 35 hp Johnson on my 13' Sport that I used when I had the boat at low altitude in Texas. Along one blade, it looks like an impact has caused the edge to be curled back by about 1 mm. Is this enough to substantially hurt the performance?
MikeC	posted 08-17-2001 07:59 PM ET (US) How fast does your boat go with that prop on there? I just bought a 13 with a 1979 35 hp Johnson and I have an aluminum 10x13 on there now and can hit 30mph with two people and 6 gallons of gas.I was just curious what other people are getting for speed.Anytime your blades are the least bit bent your prop becomes a lot less efficient,I would have it fixed.
Dr T	posted 08-17-2001 08:44 PM ET (US) Did not have a way to tell when the boat was in Texas. 30 sounds pretty good. There was an interesting thread last month on this topic started by The Mexican on this particular setup. With an 11 x 9 prop, 2 kids, me, two tanks of fuel on board I can hit about 22 MPH at 5000 ft altitude.
Dick	posted 08-17-2001 09:16 PM ET (US) Dr T An out of balance, bent or dinged prop will affect your performance. The biggest problem is vibration, you may not feel it but the prop shaft seals and bearings sure do. Running a well balanced prop is one of the most important things you can do for your motor. Dick