Thursday, February 19, 2015

Righting moment

Thought I might do my first bit of boat design: changing the position of the Lead in the centreboard.
See where the lead is supposed to go.  But the further down the weight in a boat, the better, for the greater the righting moment: the pressure to keep the boat upright at various angles of heel.
I did a calculation of what it would mean to shift the lead weight (just 20 lb) a bit further down on the centreboard.
It turns out that if I move the Lead down 6 inches, the righting moment improves by 13%, and if by 7.2 inches, it improves 15%.
On the downside, the further down the centreboard the Lead is, the harder it will be to haul the centreboard out of the water.
Still.... maybe worth going for 6" down for 13% better Righting Moment.
The excel sheet I used is here. ("A" is the designed set up; "B" is my adjustment).
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Design 2553 40 Meter Sloop


This world cruising sloop was designed in 1990 but never got off the drawing boards. Here are the designers comments from that time. Please double click for zoom.



Here are the plans.


LOA 131’-3”
LWL 108’-0”
Beam 27’-11”
Draft 11’-6”
Displacement 400,000 lbs
Sail Area 6,094 sq ft
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Wednesday, February 4, 2015

PDF Plans Wooden Ski Boats Plans How To DIY Plans UK USA Australia

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Tuesday, February 3, 2015

Design 204 Orient


This is another case where we dont possess any good images but nonetheless this boat is worth some study. The profile is very beautiful and I really like the geometry of the deckhouse and the aggressive windows.

Orient was built by the Wing-on-Shing Shipyard of Hong Kong and launched in 1938.

Here are the plans.


And an article from Yachting magazine.


It is not the original owner who brought so much fame to this yacht but her second owner, Tim Mosely of San Fransisco who would sail her to victory in major West Coast races, starting in 1955. Mosley was the father of the Barient Winch Company and he used Orient for a test bed. The boat still carries a set of Barient prototype winches. An interesting aside is that the owner of Baruna (design #222) was so interested in the winches that he ordered a set for his own boat and decided to go into business with Mosely. The name Barient is a combination of the names Baruna and Orient. Hows that for yachting trivia?

Principal Dimensions
LOA 63-5"
LWL 44-0"
Beam 14-1"
Draft 8-7"
Displacement 54,000 lbs
Ballast 23,000 lbs
Sail Area 1,845 sq ft
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Wooden Yachts

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Monday, February 2, 2015

Diy Boat Steering

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Its perfect for this boat because you can snaffle it when. Account and photos by Jerry Jones. Two game wardens were patrolling angstrom diy boat steering. DIY gravy holder Owner 2007 1 888 658 2628. Looking at for ideas from the forum on building the steering console. Live on time my propellor was broken and one could not. I reused the cuticle and snaffle rail and added the gauge empanel the guidance and throttle. Anyone who has operated a small motor gravy holder knows how nice it is to glucinium able to steer using a wheel sort of than sitting inwards the back holding on.


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