Bent prop, strut and shaft

[Rugburn]

Last night I did what I always feared would happen. I bent my prop, strut and shaft. I was only going at idle and I must have hit a rock. Hit hard enough to stall the motor. The vibrating ride back to the dock was a long slow one. I dropped it off at the dealer this morning and they dont seem to think it will be longer than a week. Im as careful as any boater out there and I have to just put it down to bad luck. I have to admit, I thought those parts would have sustained a hit like that a little better than they did, especially at idle speed. Thank goodness for insurance.

[qb12]

Rug, what kind of prop. Stainless or niberal.

db

[Rugburn]

Stock prop, looks like brass.

[JoeTechie]

NiBrAl = NIckel + BRass + ALuminum Very high tensile strength and durability.

"Brass props" were a bronze alloy of Copper, Tin and Manganese. Much softer.

Most of the information about Stainless vs any other prop - are based on this older comparrison, and that of Aluminum props. Since NiBrAl is MUCH stronger than both of those, and in most cases equal to that of Stainless. They are not really applicable anymore.

Aluminum Props have a tensile strength of about 35,000 lbs.
Manganese Bronze Props - about 60,000 lbs.
Stainless Steel - about 75,000 lbs

NiBrAl can range from 65,000-95,000 lbs !

It is time to put the stainless = stronger myth to rest. Stainless is harder to fix, and therefore really no reason to have a SS prop on a Tow Boat.

-J

[Rugburn]

Thanks for the background info on the metals Joe. One thing about my accident, I doubt a depth guage would have helped me in this instance. Ive been meaning to get one for some time now. Anybody else have close calls that your depth guage helped you out of or are they just for peace of mind?

[superman]

I would not even go out with out my gauge. I think i watch it to much. I would advise you get one.
________
marijuana strain green crack

[smokedog2]

A depth gauge is not optional IMHO.

Yes it helps

[Yellowmobius]

Rug,

I did the same thing this year, only it was a submerged tree. I also hit at idle. took out the prop, drive shaft and strut. Boat shop ordered the parts on Monday and I had my boat back on Thursday night. $1500.00 - Insurance is getting most of it.

[NCSUmoomba]

Are you guys sure you bent the shaft and strut as well, or is the dealer just telling you that? I hit a rock at about 10mph and it tore a chunk out of my prop about the size of my index finger. The boat had a horrible vibration the rest of the day. Yeah, I know it was dumb to keep driving it, but my friends and I were out at the lake having a cookout and wakeboarding fun the day before we all graduated college, so I couldn't let that ruin our day. Anyway, I replaced the prop, tightened my shaft seal and everything is fine. There is no vibration whatsoever. So just make sure you are having parts replaced that actually need replacing. As hard as I hit that rock with the prop spinning as fast as it was, I find it hard to believe that you guys prop shafts got bent and mine didn't. Good luck.

[Rugburn]

I was hoping that it as only the prop but I the prop itself was pushed off center to the left of the rudder. I definately bent the strut. Dealer says since insurance is paying for it, to replace the shaft too since they dont need much of a bump to get out of tolerance. Since my boat is a 2002 (and assuming this is the original shaft) and Im sure its taken its fair share of hits in its life, I agreed and am having it replaced.