The propeller shaft hole will be drilled prior to sheeting the bottom.
Two pieces of scrap plywood were screwed to the keel. Once the strut
mounting holes were drilled, a stack of washers under each mounting hole
was used to determine how much material had to be removed.
(28-MAR-2005)
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A jig was rigged up to flatten the strut mounting area.
The router is run on two parallel lengths of angle iron.
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Depth of cut is adjusted to remove enough material so that
the strut sits flat on the plywood.
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A block plane can now be used to finish the job.
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A 1/8" masonite spacer was fabricated and slipped under the strut
to simulate the thickness of two layers of fiberglass cloth which
will eventually cover the hull. The strut was bolted into position
and an 8' long piece of 1" round bar was fed through the strut to simulate
the propeller shaft.
(02-APR-2005)
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A guide block was loosely clamped to the keel.
Click here
to see how the guide was made.
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Push the shaft through the guide block until it contacts the keel
and mark the point. Shim the shaft until it's centered in the guide block
and mark the holesaw entry point. Clamp the guide block.
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Remove the shaft and insert the boring bar, coupler and holesaw into the guide block.
Use an inclinometer to verify the shaft angle is correct before drilling.
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Click here
to see how the boring bar was made.
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The finished shaft hole.
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A fiberglass tube was inserted into the shaft hole.
Click here
to see how the tube was made.
(03-APR-2005)
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This is a view from inside the boat. An 8' long shaft was fed through the strut and shaft hole.
A 1" hole was drlled in frame #4 to position the shaft at 12 degrees.
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A 1" ID x 1-5/8" OD rudder shaft collar inserted into each end of
the tube will center the shaft in the tube until the epoxy cures..
When the boat is righted, the tube will be ground flush with the keel.
Two laminations of fiberglass cloth will be applied to the keel before
installing the shaft log.
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Two layers of 3/8" thick by 2" wide mahogany stock were laminated to the inside chine log surfaces.
This will restore some strength to the members, lock the frames into position and provide additionnal
fastening area for the first plywood bottom screws.
(04-MAR-2006)
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