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Old 03-08-2020, 06:23   #1
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Hit my first rock

I was at gear speed and it hit hard enough to stall both Diesel engines. I have been under the boat and can see minor damage to both props. There is no vibration while underway at any speed. My question is, should I haul out immediately and have the props done or can I wait for the fall hall out in October?
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Old 03-08-2020, 06:45   #2
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Re: Hit my first rock

Just have the props pulled in the water. The dive company I used to work for did this all the time and it was very reasonable at $65 an hour for the work. They would even deliver them to the prop repair company and pick them up/reinstall.

If your not seeing damage to the hull or other running gear- I see no reason to haul.
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Old 03-08-2020, 07:29   #3
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Re: Hit my first rock

Quote:
Originally Posted by Delray View Post
I have been under the boat and can see minor damage to both props. There is no vibration while underway at any speed.
In my experience the above are contradictory sentences. Hitting rocks is a big deal, even with no visible damage.

If you're not going to run the boat, then waiting to fix it makes perfect sense. Otherwise, if you value your transmissions and running gear, haul the boat now and have the props, shafts, struts, logs and engine alignment checked.
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Old 03-08-2020, 07:32   #4
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Re: Hit my first rock

Vibration is the issue, if there is no vibration, there is nothing wrong, but watch the stuffing boxes when underway to see if your getting in excess water, and watch to see if the shafts are turning true, they are or they would be vibrating, but can’t hurt to look.

You got lucky, I’ve seen boats “bump” sand bottoms and do tens of thousands of dollars damage.

Of course the most conservative response is haul immediately, but if there are no vibrations I would wait myself.
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Old 03-08-2020, 08:26   #5
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Re: Hit my first rock

I don't know what type of boat you have, but it sounds like to props are what impacted the rock, not any part of the keel. Is that correct?

Not having vibration after the impact is a good thing. If you want to put concerns to rest, paying a diver for an inspection may be a good idea. An experienced diver may see damage that you did not see. Or, on a positive note, may tell you that it was indeed only minor damage and you will be fine. Either way, in lieu of a haulout, in your place I would get an opinion from someone experienced in boat drivetrains.

Also, the place to check engine alignment is while the boat is in the water, not while hauled out. I think that would be a worthwhile task to complete, also.

Cheers!

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Old 03-08-2020, 08:43   #6
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Re: Hit my first rock

Your first rock.

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And so many more to come.

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Old 03-08-2020, 08:46   #7
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Re: Hit my first rock

Call your insurance company. You struck a submerged object. That's usually covered by the policy. They will likely pay for a haul out and inspection then decide where to go from there.
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Old 03-08-2020, 08:52   #8
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Re: Hit my first rock

Unless you are absolutely sure that there is no other damage than the props, I would haul it out.
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Old 03-08-2020, 09:05   #9
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Re: Hit my first rock

Can you get a picture of the props and post it in here? That might provide more information. How much damage was done, and does it look like it might unbalance things?
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Old 03-08-2020, 09:12   #10
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Re: Hit my first rock

If you are in a sailboat your keel is going to hit before the prop. I'd have the diver check there when he pulls your prop. Your should be able to run the engine in gear with the props off to check the shaft alignment.
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Old 03-08-2020, 09:20   #11
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Re: Hit my first rock

I don't have a power boat but I'd be more inclined to follow what Capt Tom said. If something is damaged or broken, and you don't see it yet, it will probably make itself known at 3 am on a rough night. I crewed on a boat once that had "minor damage" done to its spade rudder due to a grounding. Sure enough, right on time, at 3, a month later it broke off completely.
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Old 03-08-2020, 09:29   #12
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Re: Hit my first rock

the props need to be fixed .. but if no vibration then it can probably wait. take a close look at the shaft and coupling when at the dock and underway. did you get a good look at the rudder and keel while underwater? another opinion might be a good idea here.
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Old 03-08-2020, 09:43   #13
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Re: Hit my first rock

I'm going to disagree with the prior statements about "no vibration = no problem". If the impact bent or moved the struts so that the bearings are misaligned on the shaft there may not be any vibration but there will be heavy bearing wear.

I'd suggest testing for this by manually rotating both shafts with the transmission in neutral. They should spin pretty easily. If they are very hard to turn that is evidence that something is wrong re alignment.
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Old 03-08-2020, 09:46   #14
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Re: Hit my first rock

I find it hard to believe that if you hit hard enough at "gear" (?) speed to stall both engines that you have not done significant damage to something. What hit first: the keel? Struts? Shafts? Props? And you're not getting any vibration? Incredible!

(Most of us around here are experts on this subject
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Old 03-08-2020, 09:47   #15
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Re: Hit my first rock

Just had similar incident but NO rock. Hauled out for other reasons after trip to Turks from FL. and saw minimally bent prop tips. Further inspection revealed slightly bent shaft as well. No ideas what caused it but NO rock. Haul lt and be sure. Russ
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