Professional BoatBuilder #166 April/May 2017

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Professional BoatBuilder Magazine

April/May 2017

On the cover: A new wooden shaft bearing is being installed in the harbor tug Paletuvier at Classic Works in La Ciotat, France. It was custom- built from lignum vitae staves machined to a close fit with the 240mm-diameter (9.5") shaft and fitted inside a bronze sleeve as a quick, long-lasting replacement for a failed conventional modern rubber bearing. Story on page 40. Photograph by Butch Dalrymple-Smith.


  • The People's Foiler by Dave Clark.  The father-and-son design team of Steve and Dave Clark develops the UFO, a stable, affordable, production-built foiling beach catamaran.
  • Taking the Simple Measure of Laminates by Robin Loscombe.  Simplified equations allow designers to calculate symmetric orthotropic panel-bending moments without resorting to finite element analysis.
  • Saved by the Wood of Life by Butch Dalrymple-Smith.  A client's looming towing contract forces a yard to look to the past for materials and techniques in replacing the shaft bearing of a harbor tugboat.
  • Waiting on the Wind by John Kecsmar.  The challenges of weighing competing practical, technical, and regulatory demands when designing crew-transfer vessels for offshore wind farms.
  • RIB on the Gota Alv by Paul Lazarus.  At HSBO 2016, venerable Norwegian builder Norsafe brought its Marathon 900 (9m/30') RIB, powered by a pair of Mercury OptiMax diesel outboards.


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