Movement in hull when on the hard

[Akapeterc]

My yacht has just gone up on the hard and I noticed that the bedroom door at the bow that was almost unable to stay shut now shuts nicely and my stern bedroom door which used to shut perfect I can’t shut because of it rubbing at the top of the door is this unusual for a boat when it sitting on its keel and other braces up on the hard?

 

[Scotty C-M]

Check that the boat is supported properly. Weight on the keel, sufficient number of supports - at least three or four on each side. The supports should each be tightened up at the same tension. Talk with your yard manager about this. If the situation still exists, then you might want to explore this further.

 

[victorhoisington]

Also, is the rig up or down? the boat will sit differently when it is supported by water and the rig is in tune than when she is out of the water and rig down or loosened for winter.

Pictures help understand as well as show what is happening in the different setups.

 

[Tom J]

Also, is the rig up or down? the boat will sit differently when it is supported by water and the rig is in tune than when she is out of the water and rig down or loosened for winter.

Pictures help understand as well as show what is happening in the different setups.

Actually, I don't think this is unusual. I know on my boat, when she is on the hard, the access cover to my bilge in the saloon does not sit level, but after a few days in the water, it fits fine. It is well known that you do not align the prop shaft while the boat is on the hard. Again, you must wait a few days while the boat is in the water before aligning the shaft.

 

[BrianRobin]

Actually, I don't think this is unusual. I know on my boat, when she is on the hard, the access cover to my bilge in the saloon does not sit level, but after a few days in the water, it fits fine. It is well known that you do not align the prop shaft while the boat is on the hard. Again, you must wait a few days while the boat is in the water before aligning the shaft.

I agree, a boat on the hard has the full weight sitting on the keel, with the weight of the boat pushing down on it, I wouldn't be surprised if the hull didn't move up. Most doors usually only have about 1/8" clearance all around, that's not much. Mine does the same on the trailer, drop it in the water and all works fine.

 

[SG]

Did they release the fore or aft stays to pull the boat with the travel lift?

I agree that the blocking can be an issue. There isn't any sign of distress of bulkheads, or attachments of elements within the boat?

If not, I'd not fixate on this until you get her back in the water and see what happens.

 

[shemandr]

I don't think it's that unusual. Boats bend. When my favorite Tartan 37 owner got a hydraulic backstay and cranked it on during a race, a crew member had to call the cockpit on her cell phone to get out of the head.

 

[Hunter Ad Bot]

And now a word from the sponsor...

Hunter props, shafts, struts, and cutless bearings

See the product

 

[Terry Cox]

My yacht has just gone up on the hard

A very disturbing view of the travel lift lowering our boat onto the keel block and watching how much the hull compressed to absorb the boat’s displacement. No damage, of course, because the hull is designed to support this weight, just disturbing to watch. I can see how fittings inside the boat might be affected by these stresses.

 

[Capt Robbie]

You will always get some flexing on the hard due to the boat is not being supported equally by water. Sounds like the Boat is not blocked properly. You should have the jack stand pads under all of the main cross support bulkheads and at lest 2 near the transom, and 1 V jack stand supporting the bow and the rest along the sides. A picture of how the boat is blocked when help. Normally a boat that size should have 3-4 on both sides preferably 4 and 1 bow stand. Note that the majority of the boat's weight resting on the keel and the jack stands essentially are there for moderate support and balance. The hull should not be buckled anywhere, if it is not blocked properly then what is occurring in the cabin is most likely the result.

 

[shemandr]

I gave up watching my boats being lowered onto the hard. On average the area around the keel would compress 6 or more inches as the boat was lowered on the keel. Don't freak out.