Issue No. 150, August/September 2014 — Table of Contents
On the cover: Ultrasonic-testing a composite hull in way of the integral chainplates can reveal potentially catastrophic delamination and bond failures without cutting into the structure or finish. Shown here are a taped-on test grid and some residual couplant—medical-grade ultrasonic gel that helps propagate sound waves. Story on page 60.
Photograph by Roby Scalvini.
22 The Membrane Concept
In 1970, a team of composites specialists worked with Fabmat to develop a membrane skin with predicted deflection on a 36′ (11m) powerboat.
26 Are Your Dealers Franchisees?
by Benjamin Ford
Boatbuilders who terminate or alter dealer agreements may run afoul
of franchise statutes, which differ from state to state.
34 H/G-H Pilot Boats, Part 1
by Paul Lazarus
Pilot boats produced by a design/build venture begun in the late 1970s between two venerable Massachusetts firms—C. Raymond Hunt Associates, and Gladding-Hearn Shipbuilding—now dominate the U.S. fleet.
50 Praise for Big Props
by Nigel Calder
In reevaluating the relationship between propeller size and horsepower of conventional marine diesels powering displacement hulls, for efficiency, go with the large prop.
60 The ABC’s of UT
by Roby Scalvini
If you can invest in just one advanced non-destructive testing technology, it should be ultrasonic.
Readers comment on sailboats from Fairey Marine; alternative lithium-ion batteries; Hinckley’s rudder plugs; identifying Hobie Alter; Black Cat’s fire extinguisher count; and the lack of Gulf Coast coverage.
compiled by Dan Spurr
Glen-L Marine; a new model from Robert Perry and Pacific Seacraft; highlights from the High Speed Boat Operations Forum; a retractable sunroof from Webasto; and concealing valuables afloat.
72 Tools of the Trade
by Dan Spurr, Steve D’Antonio, and Aaron Porter
Tools, techniques, and ideas that grabbed our editors’ attention and imagination at professional shows and conferences in the past year.
88 Parting Shot
by Erik Seither
Recent regulatory changes and on-the-water failures have driven home the need for boat designers to brush up on stability calculations.
80 New Products and Processes
85 Classified Advertising