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Author Topic:   Propeller Lost from Propeller Shart

chesapeakeblend posted 08-15-2010 04:26 PM ET (US)
I took some people out yesterday for a boat ride of about 20 miles on my Katama. Close to the dock I lost forward and reverse. Quickly I paddled the 10 yards to the ramp and pulled the boat. Turns out the prop and everything associated with it fell off!! How can something like this just fall off baffles me.
What is baffeling me more is ordering parts How do I know if I am v type or u type to replace the bushings and stoppers? Does this all go with what prop I buy (u or v type)? What pitch prop should I put back on the boat? Thanks,
Mike
jimh posted 08-16-2010 08:41 AM ET (US)
The propeller was probably spun off the propeller shaft when the engine was put into reverse. If the propeller shaft nut is not tightened and not locked from spinning by a castellated washer, the propeller can spin the nut off the shaft. Once the retaining nut is gone the reverse thrust will pull the propeller of the shaft.
By any chance did you put the engine into reverse just prior to the lost of the propeller? I bet you did.
jimh posted 08-16-2010 08:42 AM ET (US)
What is baffling to me is how we could give you advice on a replacement propeller when you have not told us any details of your motor.
dgoodhue posted 08-16-2010 09:25 AM ET (US)
Somehow your cotter pin/lock mechanism sheered or fell off. As JimH said the nut and prop and hardware most likely fell off in reverse.
A friend of mine testing his props and wanted to just go a short distance to a dock. He left off the cotter pin, at the shore in shallow water he tested the motor in foward. The prop stayed on, so he went the short distance. When he got to the dock he put it in reverse to dock it, in about 1 sec, everything fell off and he had to go diving to recover everything.
Tom W Clark posted 08-16-2010 10:03 AM ET (US)
I am baffled too. What is a "u" type of propeller? What is a "v" type of propeller? What brand of motor do you have? What model is it? What year is it? What propeller did you used to have on your motor? How was it attached to the motor? What type of hub kit was used? Who installed the propeller? When was the last time it was removed for maintenance?
contender posted 08-16-2010 11:37 AM ET (US)
You will never do that again, You had to leave the cotter key out/off the castle nut, and like the above people have stated the prop turning in reverse is like unscrewing the nut that holds the prop on. I would get a mask and go swimming by the dock and be looking for that prop... Happy Trails
BobL posted 08-17-2010 12:08 AM ET (US)
A little dredging operation near your dock to recover the lost prop should answer all of the questions. It must be pretty close to the dock. Hope you find your lost propeller.
chesapeakeblend posted 08-18-2010 09:47 PM ET (US)
Yes, I did actually have it in reverse prior to falling off. There is actually no cotter pin on the shaft. This is one where the washer has the teeth that get bent over the nut if I am not mistaken.
The motor is a 1983 Suzuki DT85. The boat used to run around 42 mph at 5,000rpm. I have a second prop that is a v1900. The best I can think is put this prop on and see if I get the same performance out of it.
Mike
fno posted 08-19-2010 02:07 AM ET (US)
buy a mask, fins and snorkel. Most likely you will find your prop.
Tom W Clark posted 08-19-2010 08:37 AM ET (US)
Mike - If the missing prop is the same vintage as your motor, then it is no great loss. Just buy a new prop and hub kit. The chances you you recovering the old prop with mask and snokel is virtually zero.
You haven't answered my question about what the old prop was, but for a new prop I would recommend a Stiletto Advantage 4.25. The pitch will depend on what your motor's gear ratio is and its WOT range.
chesapeakeblend posted 08-19-2010 10:39 AM ET (US)
Tom,
There in lies the problem. I don't know what was on the boat. I bought the setup used and did not take notice of the old prop specs. I will look up the gear ratio.
Thanks,
Mike

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Author	Topic: Propeller Lost from Propeller Shart
chesapeakeblend	posted 08-15-2010 04:26 PM ET (US) I took some people out yesterday for a boat ride of about 20 miles on my Katama. Close to the dock I lost forward and reverse. Quickly I paddled the 10 yards to the ramp and pulled the boat. Turns out the prop and everything associated with it fell off!! How can something like this just fall off baffles me. What is baffeling me more is ordering parts How do I know if I am v type or u type to replace the bushings and stoppers? Does this all go with what prop I buy (u or v type)? What pitch prop should I put back on the boat? Thanks, Mike
jimh	posted 08-16-2010 08:41 AM ET (US) The propeller was probably spun off the propeller shaft when the engine was put into reverse. If the propeller shaft nut is not tightened and not locked from spinning by a castellated washer, the propeller can spin the nut off the shaft. Once the retaining nut is gone the reverse thrust will pull the propeller of the shaft. By any chance did you put the engine into reverse just prior to the lost of the propeller? I bet you did.
jimh	posted 08-16-2010 08:42 AM ET (US) What is baffling to me is how we could give you advice on a replacement propeller when you have not told us any details of your motor.
dgoodhue	posted 08-16-2010 09:25 AM ET (US) Somehow your cotter pin/lock mechanism sheered or fell off. As JimH said the nut and prop and hardware most likely fell off in reverse. A friend of mine testing his props and wanted to just go a short distance to a dock. He left off the cotter pin, at the shore in shallow water he tested the motor in foward. The prop stayed on, so he went the short distance. When he got to the dock he put it in reverse to dock it, in about 1 sec, everything fell off and he had to go diving to recover everything.
Tom W Clark	posted 08-16-2010 10:03 AM ET (US) I am baffled too. What is a "u" type of propeller? What is a "v" type of propeller? What brand of motor do you have? What model is it? What year is it? What propeller did you used to have on your motor? How was it attached to the motor? What type of hub kit was used? Who installed the propeller? When was the last time it was removed for maintenance?
contender	posted 08-16-2010 11:37 AM ET (US) You will never do that again, You had to leave the cotter key out/off the castle nut, and like the above people have stated the prop turning in reverse is like unscrewing the nut that holds the prop on. I would get a mask and go swimming by the dock and be looking for that prop... Happy Trails
BobL	posted 08-17-2010 12:08 AM ET (US) A little dredging operation near your dock to recover the lost prop should answer all of the questions. It must be pretty close to the dock. Hope you find your lost propeller.
chesapeakeblend	posted 08-18-2010 09:47 PM ET (US) Yes, I did actually have it in reverse prior to falling off. There is actually no cotter pin on the shaft. This is one where the washer has the teeth that get bent over the nut if I am not mistaken. The motor is a 1983 Suzuki DT85. The boat used to run around 42 mph at 5,000rpm. I have a second prop that is a v1900. The best I can think is put this prop on and see if I get the same performance out of it. Mike
fno	posted 08-19-2010 02:07 AM ET (US) buy a mask, fins and snorkel. Most likely you will find your prop.
Tom W Clark	posted 08-19-2010 08:37 AM ET (US) Mike - If the missing prop is the same vintage as your motor, then it is no great loss. Just buy a new prop and hub kit. The chances you you recovering the old prop with mask and snokel is virtually zero. You haven't answered my question about what the old prop was, but for a new prop I would recommend a Stiletto Advantage 4.25. The pitch will depend on what your motor's gear ratio is and its WOT range.
chesapeakeblend	posted 08-19-2010 10:39 AM ET (US) Tom, There in lies the problem. I don't know what was on the boat. I bought the setup used and did not take notice of the old prop specs. I will look up the gear ratio. Thanks, Mike