Divet/crane

[chesseyhead2373]

I am looking to put a divet/crane into a pedestal seat mount instead of attaching a pedestal just for the divet. I am using the divet to lift about 250 pounds out of the water. Here is the question; would I need to reinforce the pedestal? Looking to do this in a lund or lowe crossover type boat, aluminum.

 

[alldodge]

Welcome
Yes it would need to be reinforced. A pedestal seat can hold that much weight but mainly force going downward. A davit will have much more load when the arm is extended. Greatest load will be the opposite of the arm.

This is why a claw hammer can easily remove a nail

 

[flashback]

Yep, leverage will rip the pedestal off the deck.

 

[garbageguy]

and consider how far away the load will be lifted from the center of the lifting structure (moment-arm) and the overturning forces the boat will see (if the lifting-structure doesn't fail)

 

[flashback]

Yep, I'm not familiar with the boat, righting moment may be a critical point as well.

 

[chesseyhead2373]

Thanks guys for the replies. Now trying to figure out how to reinforce it.

 

[Scott Danforth]

250#..... how far is the reach?

That will determine how much you need to reinforce the deck and how high up you need a second bearing on the mast

 

[alldodge]

Might try something like, take a 2x10 and strap cross both sides of the hull. One side of the 2x10 extend out as far as you might need. With boat in the water walk out to the end of the board to see what your boat does. Might try to tip, if not your good with the balance, just need to figure the reinforcement

 

[chesseyhead2373]

Looking at something like this, 500 pound lifting one, but max weight should be about 250pounds. They do make an aluminum davit but the reach won't work

Tele-Pro Telescoping Davit Crane - OZ Lifting Products

TELE-PRO® DAVIT CRANE 500 lb., 1200 lb. and 2500 lb. Capacity Individually tested and certified at 125% The OZ Lifting Products Tele-Pro davit crane features an industry-first telescoping boom adjustment while under load. This patented feature provides the user with ultimate control. The...

ozliftingproducts.com

 

[flashback]

Maybe a truss from the head of the divit to a point on the hull. It's not a good answer but might serve.

 

[Scott Danforth]

FYI, something like that isn't rated to lift people. When lifting people, the proof test is 220% rated load. The proof test in the literature is only 125%

What reach are you looking for? What height do you need to achieve? What list angle will you be operating at?

 

[tpenfield]

Is this a divit or a davit? I hate it when I leave a divit.

 

[Scott Danforth]

Is this a divit or a davit? I hate it when I leave a divit.

An improperly mounted davit will leave a divot

 

[tpenfield]

An improperly mounted davit will leave a divot

Yes, it makes sense. You use to make these, right?

 

[alldodge]

I didn't hear any say "Squirrel" but I am getting hard of hearing and didn't know Mr spell checker was on line

 

[airshot]

Watch the TV show " swamp people" many of the alligator hunters have lifting arms with winches to lift alligators up in the 500 lb class. You can see how well they are built into the structure of their boat.

 

[chesseyhead2373]

That's a great idea. Thanks

 

[Scott Danforth]

Yes, it makes sense. You use to make these, right?

Yes. 500# up to 40,000# and 20,000 SOLAS

 

[Bondo]

That's a great idea. Thanks

Ayuh,...... Welcome Aboard,...... Just how big of a boat are you mounting this in,..??