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Stern Drive Hit Rocks..Advice Needed

Hi gang...hope you can help with some advice as i hope I haven't ruined the rest of the summer for the family! I was just throttling down and coming out of plane at about 18-20mph when the bottom fin and aluminum propeller on my stern drive Mercruiser 4.3 Alpha stared hitting some boulders that were sticking up from the bottom. The fin now looks like it may be bent a slight bit and there are numerous small bends in the prop fins and a few chips as well. I have switched out the prop and tested it out and do not feel any vibration..seems to be running fine, but I am concerned that I should have it inspected and not be running it....have my test runs already done damage? Is it ok that the fin is not completely straight?
Mike
Aug 20
2006
Well I am feeling a lot better about things from all your advice. I also went to see my Mercury service shop today and he talked me into sticking with the aluminum, so I ended up buying the same prop that I had..setting me back about $300cdn. His argument was that if i had done the same thing with a stainless prop, i would likely be paying him a ton more to check the leg and possibly more due to the shock since they have little give when they hit something.

He also confirmed that I should not worry about a small bend in the bottom fin of the leg (can't remember the name he used for it) unless I was having steering problems.

Thanks again everyone!

Mike
Aug 21
Uh.

Well, while such an accident can happen to anyone, I wonder: don't you fellas have charts and depth finders? Not that everything on the bottom is listed, but you'll sure improve your odds if you have some familiarity with what's down there before you head in or over.

Harry
Aug 21
You didn't whack it hard enough to do serious damage. I agree with Bogus, if it bugs you have it straightened after the season is over - in fact, watch how the mechanic does it - it will give you some faith in the strength of the skeg.

You did the right thing with the prop.

Harry mentioned getting some charts that may or may not be available for the area you boat in. My advice is to take your boat out for the day all by yourself and learn the area you boat in - make little mental notes of where it's shallow and where it's not shallow. Remember the depths will change throughout the boating season so getting familiar with any area will take some time - at least you can note the major problem areas.

Get a depth finder.

Shortwave
Aug 21
Good advice from others already.

I will only add that you can get a skeggard cover for the skeg if it looks pretty nasty after being straightened.

http://tinyurl.com/s4g3w

Aug 21
I shreaded my skeg before. Took a good 4 inches off it and completely destroyed my prop. I had both rebuilt for about $350.00. The bad part of that mishap was that when I hit bottom I cracked the water jacket (1976 Merc 115). It's amazing how they can build those things back up.

Jesse

jesse
Aug 21
Thanks for the advice guys...I have memorized the lake charts, but they failed to include the massive boulders on the bottom in this spot...and I had just turned my depth sounder on as I was coming into this area that was new to me, but it was just a second too late. Water is really low this year, so it is not normally a dangerous area.

The prop I am using right now is a borrowed stainless 4 blade 21P (previous was 2 blade with 23P) and I think I am in love...sure notice the power difference and it has made me want an SS prop, other than the thought of having to replace it if I do this again. I don't really notice a steering difference with the bent fin. Should I be repainting over the scratches that were made?

Mike
Aug 21
It's always a good idea to scope out the area slowly anyway. There Shortwave
Aug 21
   

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