Lifting Davit Hull Supports (Design Plans Ideas)

Submitted by FineSmoke on Mon, 06/08/2009 - 17:21
I recently started using a davit with a manual lift system for #1251. Currently the davit has two parallel lift bars approximately 7 feet apart that run beam to beam across the slip under the boat. The wooden lift bars hang over the slip on steel cables and are treated lumber approximately 4'x4' with each mounted parallel and on top of a steel bar. I need to modify the beam to beam supports so as to provide hull support when the boat is lifted out of the water--something like the bunk boards on a boat trailer. Does anyone have some ideas, designs or plans for some modifications I can make to the existing lift bars? Keep on, Craig Smitham 214-538-9444 csmi...@chfirm.com White Rock Boat Club Dallas, Texas FS #1251
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Comments

Cover the wooden supports generously with suitable carpeting.

Submitted by karafiath on Tue, 06/09/2009 - 12:07.
Cover the wooden supports generously with suitable carpeting. Ensure that the wood gets soaking wet on a regular basis, say weekly or more often. Eventually the wood will bend and conform to the hull shape. I have a Jet ski host for my Scot. FS 3512

Karafiath, I doubt 4 x 4 timbers mounted 90 degrees to the axis

Submitted by Jay Lott on Wed, 06/10/2009 - 07:54.
Karafiath, I doubt 4 x 4 timbers mounted 90 degrees to the axis of the boat on top of steel bars are going to bend to conform to the bottom shape of the boat, no matter how often you soak them. Finesmoke, probably what Karafiath was thinking is that if you run some 2 x 6 bunks parallel to the axis of the boat, then you will get a lot of surface contact and support. Like on a Flying Scot bunk trailer. I have the exact same request as Finesmoke. I am looking for dimensions or plans for form-fitting hull supports which would be mounted on bars which are 90 degrees to the axis of the boat. If anyone has them or knows where they can be obtained please let me know. Thanks.

Yesterday, Dee at Flying Scot Inc.

Submitted by FineSmoke on Thu, 06/11/2009 - 17:51.
Yesterday, Dee at Flying Scot Inc., very promptly replied to my request for help on this subject (see my recent post on this subject under the "Maintenance, Repair..." forum). To see the document, click this title: Cradle Storage for the Flying Scot This one pager answered my question for the most part with written instructions and diagrams. [ed. FSSA Web Editor] After reviewing the document my follow-up is two-fold: First, the cross bars in my davit are approximately 9 feet apart center to center (due to the location of the reinforced dock posts sunk all the way into the bottom of the lake on which the steel cable pulleys are located—not 6 feet as recommended). Also, if I put the forward cross bar under the mast step, my bow point and forestay come up under the cross-davit pipe spindle that the cables roll up on. Because of flood danger, when stored in the davit the deck really should be raised above the level of the pipe spindle. Second, I do not want the boat to sit level in the davit when hoisted—I want the bow raised to the point that any rainwater that gets in drains out the transom drain hole. (Even with a mooring cover in place we are advised by the boat club to always remove the drain plug on storage, because if the boat fills with water the weight of the water damages—or completely breaks—the reinforced dock posts on which the steel cable pulleys are located. So, what would be a good way to raise the height of the bow deck higher than the aft deck during storage in the davit? Would it be in modification of the forward cross bar (i.e., making it taller than the aft one), or modification of the angle of installation of the two fore and aft supports? (Or, maybe some modification of all 4 supports?) Keep on, Craig Smitham 214-538-9444 csmi...@chfirm.com White Rock Boat Club Dallas, Texas FS #1251 FS #1251