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Boat lift bunk board question

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samudj01 View Drop Down
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    Posted: March-13-2019 at 4:22pm
For the engineers: I bought a used hydrohoist without bunks (they were stolen). The brackets for the bunks are there which are 2x2 angle sticking straight up. I plan to attach 2x material to the angle with bolts similar to many cable hoist setups I have seen (plan to round edges and carpet). It is a 4400lb lift and the distance (length) between the angle brackets is ~12’.
-what size board should I use?
-the board will only be held by the bolts unless I weld on a tab. Are bolts sufficient and then are two bolts per bracket sufficient?
-plan is grade 5 galvanized bolts. Should I consider others?
Appreciate the feedback.
1999 Sport Nautique w GT40
1978 Ski Tique and 1972 Skier w 302's
Previous - 1987 Martinique w 351
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8122pbrainard View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: March-14-2019 at 8:02am
David,
I would go with at least a 2x8 or bigger if you have the vertical room. Also, do check the prop/rudder clearance if the boat sits that far forward on the lift. You will have 8 bolts in shear so I really wouldn't worry too much about the grade of bolt but if you can find grade 5 in a hot dipped galvanized, go for them. Tabs for support of the wood is a nice idea but I don't feel absolutely needed. Do use some heavy large diameter washers on the wood side. Then after a few wet/dry cycles check the bolts for tightness.


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64 X55 Dunphy

Keep it original, Pete
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samudj01 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samudj01 Quote  Post ReplyReply Direct Link To This Post Posted: March-14-2019 at 6:08pm
Thanks for the feedback Pete. This gives me some confidence. I was most worried about the shear strength of the bolts holding the board to the bracket.
1999 Sport Nautique w GT40
1978 Ski Tique and 1972 Skier w 302's
Previous - 1987 Martinique w 351
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