The Lumberyard
Three basic points of reference (click to open/close)
When setting up the framing for a hull there are three basic points of reference. When these points are kept in check you will get a fair and even hull. First, each frame is set at 90 degrees to the keel; secondly the frame is set at 90 degrees to the surface so it does not lean forward or backwards. Third the frames are set level from side to side. The keel notches and the use of spacer blocks assure frame spacing.
Getting a 90 degree keel (click to open/close)
 To begin, the keel is sandwiched between two blocks set on plate glass. This basic setup gives the needed 90 degrees to the surface and the 90-degree to the keel.
Create a grid for reference (click to open/close)
A ruled line was set up in the computer. Any program that will draw a line will do the trick. I set mine up in CAD with lines spaced out at .030. This is then printed out and glued to foam board. Evenly cut the foam board at the bottom line. This keeps the lines parallel to the surface.
Start at the center of the hull (click to open/close)

The first frame set up is in the center of the hull. Starting in the center of the hull and working in two directions to the bow and to the stern greatly reduces any chance of error down the entire length of the hull. If you were to begin with frame one and work your way to the stern any frame that had a lean will continue from frame to frame.
Leveling with your reference grid (click to open/close)
Taking a close look at the frame set up; you can see the top of the frame touches the same line on both sides. This simple process levels the frame from side to side. Another way to accomplish this is to use a line level, which is about two inches long. Set a piece of wood across the top of the frames. Place the line level on the wood to make sure your frame is even from side to side.
Setting the frame in place (click to open/close)
With a little dab of 5-minute epoxy in the keel notch, the frame is set in place and rubber banded to the backing board.
Working in groups of three (click to open/close)
When the first frame is glued into place, the keel is slid out to the next notch. The next frame is set in the keel notch and the keel and frame are pushed against the backboard until the frame stands square. Frames were set up in groups of three. A frame was skipped and the next set of three were set up. Each set of three were held together by the gun port sill. This worked to maintain the proper spacing but proved to be to weak when it came time to sand the hull. Some of the joints between the port sills and the side of the frames broke. To correct this, a small spacer block was glued in the space under the sill.

Go to part 5 - BUILDING THE HULL

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