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Bluejacket 24 plan & profile
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Keel and portside panel partly stitched
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Chine and keel fileted
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Longitudinal bulkheads fitted
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Ready for first turnover
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Spreading fairing compound over sheathing
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Emerging from the cocoon
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With a little help from my friends
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Liz, wet at last
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Liz & Grey Ghost in Sharon Springs NY
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In Peterborough, Ontario hydraulic lock
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In a regular lift lock
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Liz on Lake Muskoka, ON
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Forward cabin
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Interior port side
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Steering station
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Private head
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Run from stop sequence of BJ24.
BJ24 at 6 to 7 mph. Trim is the same as at rest, or zero degrees. |
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A llitle faster at 8 to 9mph. |
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Bow starts to rise at 9 to 10mph. |
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Now running at 11mph. There has been no noticeable transition "hump" from displacement to planing speed. |
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Now at about middle of cruising speed range at 15mph. Shifting of crew fore-n-aft or change in motor trim have almost no effect on longitudinal trim of the boat. |
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BJ24 is now running at about 20 to 21mph. |
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This is max speed of 23 to 24mph. Notice that the boot top at the transom is visible above the waterline throughout the speed range. The bow rises to a maximum of approximately two degrees trim. When backing off slowly on the throttle, the trim drops very slowly to about 6 or 7mph where it suddenly falls to zero. |
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Model of Bluejacket 24 for towing tests. Length is 48" at scale of 1:6. Towing bridle connected to CG of model. The chine is taped from midships aft as part of the variable bottom profile testing program. Marking on stern is identification of trial conditions of displacement and degree of bottom warp. |
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Detail of towing bridle. The center line to the stem is for controlling direction in getting the model underway. This line is slack during the test so as not to interfere with model trim angle. |
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Stern view of test model. The name was part of the wish to find the simple solution to low speed planing. The tape on the transom is used to secure different transom deadrise profiles for comparative testing. |
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Bow view showing the stem towing attachment points later abandoned as not proper. The deck hatch allows access for adjusting trim weights for displacement variations. |
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Test weights are graduated in 10% and 5% of design displacement so model could be evaluated from minus 20% to plus 80% of nominal. Graduations on the mounting board allow weights to be placed on points predetermined to maintain static trim at design level by floating model in bathtub. |
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