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The handles for winding the winches are inserted here. This exploded detail shows the arrangement of the corners of the frame. Rolling a hull of this size is usually an operation that requires a small army of helpers. The cranes rotate the hull in place, keeping it from rolling and traveling across the floor�a benefit for working in a small space. A modified tie-down winch is shown here with the webbing rolled up and its end loop threaded through the winch drum and a metal retaining pin inserted.
The ratchet gear is painted white; the ratchet pawl is blue and the added handle is yellow. The weld joining the ratchet pawl and the handle is painted red.
The weight of the handle pushes the pawl against the gear. When this type of winch is used on a truck, the pawl is on top of the ratchet gear pivots under its own weight to engage the ratchet. When the winch is mounted in this orientation, the added handle provides the gravity operation and allows the operator easy and safe release of the ratchet gear, as needed.
To use the cranes, lead the belts under the hull and load the ends on the winches. Tension the belts and lift the hull slightly to allow the building jig to be released and removed. Block the hull up and take the tension off the belts to reposition them on the winches, rolling most of the belts onto the winches on the same side of both gantries and leaving just enough on the winches opposite to begin rotating the hull. This method provides the most length for lifting.
The loops sewn into the ends of the webbing must be threaded through the slotted drum of each winch and have a steel rod inserted to prevent the web from slipping out of the winch. A heavy load may unwind webbing that relies on additional wraps to keep them in place. Winch the hull up a few inches and begin rolling the hull, keeping it parallel to the floor.
Wind each belt from the full winch to the nearly empty one. The helpers operating the empty winches pull and reset the winch handles as needed, and the ratchets will lock themselves automatically with their own weight.
The helpers on the other side paying out the belts will have to pull back on their bars slightly, lift the ratchet dog handle, let a few inches of webbing out, and let the ratchet relock. Twins of Harley Quinn and Robin have winch duty. The hull rolls as the process is repeated. The operation will progress smoothly if the teams coordinate their efforts between the winches paying out and the winches pulling in. Continue until the hull has rolled 90 degrees or slightly more. Once the tipping point has been passed, the hull should slide upright on its own, or with just a little coaxing, within the confines of the now static belts.
After the hull is upright it can be raised and then lowered onto a cradle or positioned on blocks. At the end of the build, the gantries lifted the finished 2,lb boat onto its trailer. With the webbing shifted to the left sides, the hull is upright, ready to be lowered onto a cradle for the construction of the interior.
The gantry cranes will be put aside and returned when the finished boat is ready to be lifted onto its trailer. If your work space has strong, accessible ceiling joists or other overhead structures that can support the hull, you may be able to use truck winches without having to build gantries.
The ratchet dog handles will work by gravity in the orientation shown; if they are used upside down, then a spring mechanism or a counterbalance opposite to the ratchet handle will be needed. Earl Boissonou , 81, lives in Corvallis, Oregon, and is a retired elementary-school teacher. He is a passionate artist who draws, paints, and sculpts.
He began sailing in and built his first boat, an Adirondack guideboat, in to keep busy while recovering from a major operation. The Glen-L Bo-Jest that required the gantry cranes was his most recent build. He wishes to credit to his friend John Fruetel for coming up with the idea of the gravity-operated ratchet dog�a necessary component. At age 91, John still as an active and inventive mind. You can share your tips and tricks of the trade with other Small Boats Magazine readers by sending us an email.
Refer back to illustration 2 for this detail. We welcome your comments about this article. Locally at the Apprenticeshop, Dale Young rigged tall boat stands to do this. A beam goes across them after the pads are removed. Sling is rigged, then the screw on the boat stands cranked up, one person on each side.
I have four trailer winches and do you think they will work? How much weight would you guess that one crane with chain fall would work to lift out V-8 engine from boat? You could Diy Dinghy Crane Limited use steel shaft with roller at corner to allow webbing to go down to the lowered winches.
Standing on ladders is not my idea of safety especially when you are talking about four ladders. The longer webbing with rollers would help ease weight distribution. Would suggest boat trailer rollers? An eloquent description enhanced by excellent illustrations and a model which is a work of art.
I was captivated by the ingenuity of the use of the webbing winches and the construction of the the gantries. Thank you, Rob. I have something similar done from 4 logs 16x5cm and one 16x8cm for the top. As diagonal stringers I use tensioned rope, it is not good for long term hanging, but for turning boat it was ok. There are also groves in the top log for the legs, this stabilize the crane a lot. I wanted to create something that can be easily assembled and disassembled and stored for later use.
It is used for my kg Jollenkreuzer. The size of the construction is around 3x3m. The greatest issue while turning the boat was that it is around 2m wide and there were not much space left, but it passed. Great to see a practical way of safely handling your boat. An essential item with the Flying Fifteen weighing in about the kg lbs mark. When maintenance requires close attention to the fixed keel right the way around, many hours of wet-and-dry sanding to get a very slippery keel.
A gantry is essential. I question the use of ladders. A few turning blocks can lead belts safely to the ground. Always use tested and rated belts and slings. Please keep your feet on the ground and never work under or on the vessel unless it is well and safely supported by heavy timber, which is usually at hand and is relatively inexpensive�often available as off cuts from your local timber supplier.
Lastly, crawling around under a boat is not wise. Having access to a safe hoist makes maintenance, and building for that matter, much safer and easier. Ask anyone with a fixed-keel boat that they trailer from home! Very nice! I did something similar using two chain hoists and webbing with spreaders to lift my boat off the build frame and slip the trailer under. This made adjusting the trailer to suit the boat really easy. Do those differ from common boat trailer winches with a webbed strap from the winch drum to the boat?
The winches noted in the article are truck tie-down winches. Your email address will not be published. Paul designed a modified version�. John had taken his inspiration from a working peapod built in around in Washington County, Maine.
It was the same peapod I had been drawn to in American Small�. Gulls hovered in the breeze;�. The blade does not lock when open.
The frame and pins in�. The Explorer delivers that capacity in a 7. The face of the unit has two ports for volt power,�. When comparing rowing and sailing strategies for an oar-and-sail boat, it is easy to assume that rowing a direct leg upwind might prevail over a sailing a zigzag course to�. While vacuum-bagging an entire hull may be beyond the means�.
When I was younger�. Search for:. Share this article. Join The Conversation We welcome your comments about this article. Comments 11 What weight and beam of boat did you lift? Earl, Thank you to responding to the requests for an article on gantry cranes. Leave a Reply Cancel reply Your email address will not be published. Technique DIY Gantry Cranes Rolling a hull of this size is usually an operation that requires a small army of helpers. Related More Technique. Technique Tacking for Rowing When comparing rowing and sailing strategies for an oar-and-sail boat, it is easy to assume that rowing a direct leg upwind might prevail over a sailing a zigzag course to�.
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