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Yacht Designer Tad Roberts' Web Log

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Post Class Patrol Boats

Once again our Federal Government is selling off what I think are irreplaceable assets at a bargain price. Five of the 65′ x 17′ Post Class Patrol boats were built by Philbrook’s Boatyard in the early 1970’s. The next few days will see what I believe is the last one still in government service, the[.....]

CCG Hero Class and Safety Concerns

It should not come as any surprise that large, expensive, incredibly complex machines raise issues of competing interest. Union of Canadian Transportation Employees members are alleging un-addressed safety concerns on the CCG newest ships. Chronicle Herald Story here From the story it sounds like TC has been issuing operation certificates with promises[.....]

Stability of Canadian OFSV

CBC has just published a story CoastGuard Ship Redesign, outlining the discovery of apparent instability in the initial design of our new OFSV’s (Offshore Fisheries Science Vessel), three of which Seapan has under contract and the first under construction. This story seems like pot stirring coupled with the usual misinformation. These are large and[.....]

BC Handliner, Luoma Loon

Luoma Loon, BC Handliner built by the Luoma Brothers at Shack Island probably in the 1930’s. She’s 13′2″ x 4′ to the outside of her 1/2″ planking. 12 strakes of red cedar, six per side, on 1/2″ x 1″ bent frames spaced 6″. The Luomas built dozens of these between the 1920’s and 1940’s. At one[.....]

Gillnetters at Cassiar Cannery

Gillnetters at Cassiar cannery waiting for the season to start. All painted up, some of these are new boats, one or two built at the cannery and others built by Wahl’s in Prince Rupert. No chimneys so these boats had no heat. This was post Easthope, boats were running Chrysler Crown’s or Ace’s. The[.....]

Capsize of Refugee Boats in the Mediterranean

Mass drownings in the Mediterranean Sea day after day. A horrible situation that’s entirely preventable, or would be if someone (UN?) could enforce some simple loading guidelines. Of course I realize the problems are not anything close to simple, and the only real cure is to eliminate the need of people fleeing their homelands in search[.....]

Stability and the Leviathan II

Leviathan II has been recovered and is floating upright. This is good and it will allow investigators to gather facts on the precise condition of the ship at the time of the accident. Unfortunately, damage is so extensive that any “real stability at time of capsize” will be impossible to establish. This[.....]

The Troller Georgina

Her name is Georgina, a very old picture of a troller, perhaps before gurdies, for sure no davits. No exhaust stack so probably Easthope power. It’s mesmerizing how these old boats would slip along at 5 knots with no wake at all. Photo courtesy Don Macmillian, from his mother’s collection. Likely taken on the North[.....]

Small Boat Stability

Before we start looking at specific stability issues and possible regulatory problems, it’s important to get the basics understood. Above is a basic diagram showing three stability cases. The “Stable Condition” where G is below M and there is a positive GZ. Gravity is pushing down through G, the Buoyancy force is[.....]

LEVIATHAN II and STABILITY ISSUES

Leviathan II was built in 1981 as the CZ-72-112, a fast aluminum crewboat, her name changed at some point to Crown Forest 72-112, and she was rebuilt in 1996 to become the Leviathan. Registered length is 64.5′, beam 15′1″, and depth 5′3″ (this is not draft but depth of hull, deck to keel). 32.58 gross[.....]

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