two feet below the aft chainplates on either side of the outer hull there are concave dimples the size of a pie plate. This is my first boat and I have no idea what to do Thanks
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Dan Sheehan AMS
Unusual for a Hunter 30
This is an unusual problem in a Hunter 30. It may be that the aft lowers are seriously over stressed causing the hull to deflect where the knee that anchors the aft chainplates is glassed to the hull. First check the rigging tension. Make sure the knees have not started to detach from the hull. The knees are cored with wood and sometimes will rot out if the chainplates are leaking. This is not likely in your case as that would cause a loss of rig tension. I see this situation on many Irwins and other boats that have thin hulls where the rigging tension is overdone. The Cherubini Hunters are not thin hulled and that is why it is unusual to see this in one of those.It may be only a cosmetic issue but you need to have it looked at before afailure occurs. Dan Sheehan AMS
This is an unusual problem in a Hunter 30. It may be that the aft lowers are seriously over stressed causing the hull to deflect where the knee that anchors the aft chainplates is glassed to the hull. First check the rigging tension. Make sure the knees have not started to detach from the hull. The knees are cored with wood and sometimes will rot out if the chainplates are leaking. This is not likely in your case as that would cause a loss of rig tension. I see this situation on many Irwins and other boats that have thin hulls where the rigging tension is overdone. The Cherubini Hunters are not thin hulled and that is why it is unusual to see this in one of those.It may be only a cosmetic issue but you need to have it looked at before afailure occurs. Dan Sheehan AMS
checked tension and knees
Thanks Dan for the response. My neighbor at the boat yard inspected the knees wich seem intact with no seperation from hull.The rigging tension was moderate and I've since relaxed the tension with no apparent effect to the deflection. Would it make sense to score the glass on the knee to inspect the wood core? Thanks, Spike
Thanks Dan for the response. My neighbor at the boat yard inspected the knees wich seem intact with no seperation from hull.The rigging tension was moderate and I've since relaxed the tension with no apparent effect to the deflection. Would it make sense to score the glass on the knee to inspect the wood core? Thanks, Spike
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Dan Sheehan AMS
Probably just cosmetic
If there is no water weeping from the knee I would not start putting holes in it just to check. It sounds like you are just looking at a cosmetic issue. FRP is flexible, if you put a load on it in a certain direction for almost 30 years it will deform. Or if the load is placed on it before the hull cures sufficiently. If the tabbing between the knee and the hull fails you probably would not have the dimple in the outside as the load would not transferred to the outer hull. If it was my boat I would probably just live with it. I had one customer who spent a year trying to eliminate the dimples in his Ranger 30 only to have them come back the following year. Dan Sheehan AMS
If there is no water weeping from the knee I would not start putting holes in it just to check. It sounds like you are just looking at a cosmetic issue. FRP is flexible, if you put a load on it in a certain direction for almost 30 years it will deform. Or if the load is placed on it before the hull cures sufficiently. If the tabbing between the knee and the hull fails you probably would not have the dimple in the outside as the load would not transferred to the outer hull. If it was my boat I would probably just live with it. I had one customer who spent a year trying to eliminate the dimples in his Ranger 30 only to have them come back the following year. Dan Sheehan AMS
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HN
I've seen the exact same thin on a 1981 H30
My friend and neighbor has an 1981 H30 or 31. He has the boat sotred in is side yard for a year or two. About 6 months after he had the boat moved to his yard he got a dimple that looks just like yours right on top of the cradle jack plate (where the plywood square for the cradle presses against the hull). For some reason he has his mast suspended by lines on the side of the boat that has the dimple. I think that the weight of the mast is pulling weight on the cradle jack in this area. I dimple might disappear when he puts the boat back in the water. I would bet that when your boat was new, before the resin fully cured, the hull was put in a cradle with the weight on the jacks rather than the keel and this caused deflection in the hull. Because the resin is still a little soft before the full cure the dimples stayed. When a boat in in the cradle it should be sitting on the keel. The cradel jacks are to keep the boat from tipping. If this occured when the boat was older look for spider cracks in the gell coat on the outside on the outside if you gring the bottom paint off and wpe with solvent. Or on the inside glass. THere probably isn't any gell coat on the interior of the bildge where you dimple seem to be. Since the older hunters are solid glass on the hull any minor cracking is probably not structural but if you are really concerned have a surveror look at it. HN
My friend and neighbor has an 1981 H30 or 31. He has the boat sotred in is side yard for a year or two. About 6 months after he had the boat moved to his yard he got a dimple that looks just like yours right on top of the cradle jack plate (where the plywood square for the cradle presses against the hull). For some reason he has his mast suspended by lines on the side of the boat that has the dimple. I think that the weight of the mast is pulling weight on the cradle jack in this area. I dimple might disappear when he puts the boat back in the water. I would bet that when your boat was new, before the resin fully cured, the hull was put in a cradle with the weight on the jacks rather than the keel and this caused deflection in the hull. Because the resin is still a little soft before the full cure the dimples stayed. When a boat in in the cradle it should be sitting on the keel. The cradel jacks are to keep the boat from tipping. If this occured when the boat was older look for spider cracks in the gell coat on the outside on the outside if you gring the bottom paint off and wpe with solvent. Or on the inside glass. THere probably isn't any gell coat on the interior of the bildge where you dimple seem to be. Since the older hunters are solid glass on the hull any minor cracking is probably not structural but if you are really concerned have a surveror look at it. HN
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