Current Issue

April/May 2021 — Table of Contents

Professional BoatBuilder cover photo

On the cover:  Seakeeping and offshore performance are important measures of a successful 40-knot sportfisherman like Islamar, an 80′ (24.38m) model designed by DLBA Naval Architects and built at Weaver Boatworks in Deale, Maryland. Story on page 20.
Photograph courtesy of DLBA.


Steve D’Antonio

Aligning engines to shafts. Page 16/17.

Task Sheet: Engine Alignment
by Steve D’Antonio
A guide to principles and best practices for aligning engines to shafts.

Christopher Swanhart

The science of spray. Page 20.

20  Wet Boat, Dry Boat
by Christopher Swanhart
By identifying and measuring the characteristics that make a boat run wet, we can avoid them and design new models that keep passengers and operators dry.

Courtesy APER

Boat-disposal programs. Page 34.

34  Disposal, Part 2: Vanishing Acts
by Dieter Loibner
Practical fiberglass-boat disposal is essential to developing a complete life-cycle plan for the industry. Strategies from around the world suggest next steps in making derelict boats disappear.

OceanPlanet Energy

Solar controllers. Page 50.

50  Sizing and Selecting Solar Controllers
by Tom Whitehead
Choosing the right charge controller to optimize recent technical advances in batteries and photovoltaic panels.

Henri Thibault

Heart of a French runabout. Page 60.

60  Bill Is Back
by Gérald Guétat
A restored 1956 Kirié Simca recalls an era when runabouts powered by small marinized car engines dominated French boat racing.


6  Letters, Etc.
Readers comment on the scarcity of lightweight pilot boats; finding inspiration in naval architecture texts; and Gurit’s menu of cleaner composite materials.

10 Rovings
compiled by Dieter Loibner
Baltic assembles a 68′ (20.73m) Café Racer built with flax-fiber laminate material; Hanse Yachts establishes a design institute in Poland; eight bells George Hazen; and NMEA’s OneNet standard is ready for prime time.

76  Parting Shot
by Warren Miller
Why accommodations on modern cruising sailboats tether them to the marina, and some changes that could let owners sleep in comfort without shore power.


66  New Products and Processes

67  Connections

69  Classified Advertising

71  Index to Advertisers