Boat Davits

I have davits behind my house i live on a salt water canal can I use the davits to lift my pontoon boat out of the water

It depends on the overall weight of the Pontoon boat and the "Capacity" of the Davit. Most Davits have a weight capacity of 1500 lbs. Since most Pontoons exceed this weight, it's not likely. You'll need to have a boat lift.

2010-05-06 06:43:51 by anthony acevedo

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I have 2 high capacity Davits (5,000 lb each) each built on a concrete base and mounted on the seawall and the ground in the backyard of my house. They are 26 feet apart. My question is how to use these davits to lift a boat say 5,500 lb? Do you hook them to the back and front of the boat (not sure this is a good idea for the hull structure). Do you use straps and spreader? Do you make a support beams from wood and steel to support the boat and lift it from the support beams? or do you get rid of them and buy a 4-pole lift for $8,000? Thanks
Michael

You certainly need slings. But other than that it depends on the vessel. If it is a strong boat, such as a yacht, fishing boat, workboat etc. then probably not, If you don't want to raise it too high.

But if it is a lighter vessel then two spreaders is by far the best way. The primary objectives with the spreaders are to avoid crushing the vessel (squeezing it) with its own weight, at the sheerline, and avoiding damage to any superstructure where the slings on their own might foul this. They will also allow you a much higher lift.

Make each of them (or have them made) with two heavy welded eyes on each end: one on the top and one on the bottom: Four, in all, per spreader. Two equal lengths of heavy, square or rectangular, box section would be ideal for the spreaders themselves.

Put lifting shackles on each eye and to each top shackle, add a specified and equal length of lifting chain, shackled once again at the centre to a lifting ring, to form a triangle when suspended, with an angle not less than 45 degrees between the spreader and each chain. The davits' shackles will attach through these centre rings.

On each bottom shackle, fit your two lifting slings, and away you go.

This assumes a boat that is reasonably longer than the 26 feet you say the davits are set apart. And don't forget to establish the correct position for the slings, particularly the aft one: Avoid lifting the vessel on its rudders or stern gear. And be sure to use high-tensile lifting shackles and chain. Not just any old stuff.

What a most envious setup!

-|--)

2010-08-17 13:27:26 by Sean

A small boat hangs from two davits, one of which is shown in the figure. The tension in line ABAD is 82lb. Determine the moment about C of the resultant force Ra exerted on the davit at A.

And the other problem is:
It is known that a force with a moment of 960 Nm anout D is required to straighten the fence post CD. If the capacity of winch puller AB is 2400 N, determine the moment about A. Height is .875 m and length is 3m

Have you ever heard of giving us a link to the figure? There is no excuse for its absence. Either scan it or reproduce in image drawing software. And then upload it to an image hosting service.

2010-02-08 21:19:32 by brit

I wrote about the sinking of the Wilhelm Gustloff. 9000 people died and they were all Germans and this was during WWII. I’m not sure how they will respond; they’ll either mourn the loss of life or think that I’m some kind of Nazi sympathizer, which I’m not. If you have the time could you just glance over it and tell me your feelings towards it. Thanks.
January 1945. The Reich is crumbling. Soviets press into East Prussia, tales of brutality, torture, and death precede them striking fear and panic in the countless refugees fleeing to the West. Explosions and screams fill the roads to Danzig. Russian planes fly overhead, like raptors they strike at their prey dropping bombs onto the icy terrain, blasting holes into the canvas of despondent German citizens. In Danzig, waits their only hope, the Wilhelm Gustloff, the flagship of the Kdf’s (kraft durch freude) strength through joy program. At one time it was a luxury ship that provided affordable travel for German soldiers. During WWII it was transformed into a hospital ship then later into a navy barracks. Now a bleak gray paint covers its once gleaming, ivory walls. It is no longer a symbol of strength or joy but one of despair and loss. Throngs of people cram the docks. SS Storm troopers scour the crowds looking for any able-bodied men, as young as 15, to fight on the front and defend their crippled country; its mostly women, children, and wounded soldiers now who try to gain passage. As the ship readies to sail frantic mothers hand off their children to strangers lucky enough to board. Frenzied people try to gain access at any cost.
The Wilhelm Gustloff is ill ready to make passage. It’s engines haven’t been used in four years, many of its original lifeboats are missing and it only has a maximum capacity of 1,880 passengers and crew, when it left the docks on January 30 it held over 10,000 people. Below deck each passenger is crammed into every space available. They can’t stay on the decks, it is about 0 degrees Fahrenheit the cold, harsh winds of the Baltic make it impossible. They are required to wear life jackets at all times which many ignore. The ship cannot handle so many people and the plumbing clogs making a bad situation even worse. Food is offered to those who can stomach it. But most just wait and prey hoping to make it to mainland Germany alive. On the bridge four captains plan and argue about possible routes to take. Originally the Wilhelm Gustloff was to have three escorts two torpedo ships and the Hansa, another cruise ship carrying thousands. But one torpedo boat and the Hansa experience problems and can’t continue leaving the Gustloff almost defenseless. Later in the evening the captains are informed that a German minesweeper is heading in their direction. The senior captain, Friedrich Petersen, decides to turn on the ships lights in order to avoid a collision making the Wilhelm Gustloff easy to see in the dark. The Russian submarine S-13 makes its way into the Baltic and easily spots the shining cruise ship. It was now after 8 pm and Hitler’s voice booms from the radio. His celebratory speech of the 12th anniversary of the Nazi rise to power echoes through the corridors. Some feel comforted and hopeful while others cynical and revolted. Shortly after three torpedoes strike the side of the Wilhelm Gustloff. In a hurry the captains seal the watertight doors sealing in many off- duty officers, officers who were trained in emergency procedures. Thousands of people storm the decks of the ship. They frantically claw at the frozen davits holding the lifeboats; they manage to free some. A few officers try to keep order but fail. Children are pushed out of the way and into the freezing Baltic. Some lifeboats are lowered but people crowd them and fight most smash into the sea sending passengers into the icy waters and crushing some. The once powerful and glorious cruise ship sinks in less than 45 minutes. Thousands of people are left in the bitter waters of the Baltic. They try to stay above water grasping onto anything or anyone. Many of the children are spared an almost certain death of hypothermia. The life vests they are wearing are meant for adult bodies they are turned upside down and drown. Ships receive an SOS and move to save the thousands who are now stranded in the unforgiving sea. The remaining survivors are hopeful they see the lights of other ships moving towards them. They’re saved. Then in a moment their hope turns into hopelessness the ships leave and return to safer waters. They fear attack and retreat. But there are several who stay to rescue those they can. Out of over 10,000 passengers only 1000 are saved. Over 9000 people died as a result of the sinking of the Wilhelm Gustloff.

It is the single greatest maritime disaster in history not just because of the tremendous loss of life but also because it is an unknown disaster largely ignored by the pages of history. But this doesn’t make it less real. These were real people who lived, suffered and died because of a war they did not start and events they had no control over. They were not rich, or privileged, or powerful by any means, they had nothing except a desire to live. I want you to remember them and their story. They may have been citizens of an enemy state but that doesn’t make them less human, less like us. All of us are alike we have the same desires and dreams, we all hope and love. And all of us are affected by tragedy no matter how great or smal

First of all you don't have to feel apologetic for giving people another side to a story. I feel that all war is wrong and there you can be neutral. My daughter did one on the fire bombing of Dresden which at the end of the war burned and killed 100,000 people. All of them were women children and old people. War is evil because people are evil. The atrocities by the allies are not known. I grew up in a German town in Canada but being Mennonite we do not fight or support war as a solution to solving problems.
You do need to inform and show the evils of war and the effects of decisions that people make and lives that are lost.
At the end of the war countless Germans were killed and most were only obeying orders or be killed. The German people were not all Nazis or Nazi sympathizers. I consider myself a mini Nazi historian on the war. I was unaware of this article and wish you well in your presentation. Your points are true and we need to hear what you are saying.
What country are you in?
Go for it.....

2007-10-01 17:00:49 by meeko6811

In the early 1940s, as the Navy expanded in response to the threat of involvement in World War II, a large number of civilian passenger ships and larger freighters were acquired, converted to transports and given hull numbers in the AP series. Some of these were outfitted with heavy boat davits and other arrangements to enable them to handle landing craft for amphibious assault operations.

There are, sadly, none left.

2007-05-08 11:12:22 by phil_anselmo39701