Secondary menu


A graduate of Webb Institute of Naval Architecture, Jim Antrim founded Antrim Associates in 1979 after apprenticing with leading naval architects Dick Carter, Britton Chance and Gary Mull. His design portfolio is one of the most diverse in the industry, and includes record-breaking custom multihull and monohull sailboats, popular production boats, wing-sail assisted motor-catamarans, and recently, a solar-powered unmanned electric craft.

Always keeping an eye toward efficient innovation, Jim's expertise in composite engineering yields high-performing and weight-effective structures. Jim has developed several computer programs used in laminate engineering analysis, as well as performance analysis and prediction. His services are often sought after by other leading naval architecture firms.

His love for the sport of sailing ensures thoughtful, fun and leading edge designs.


In 1999 Jim was awarded the grade of Fellow by SNAME (Society of Naval Architects and Marine Engineers)

"The grade of Fellow shall be accorded exclusively to individuals who
have made outstanding personal contributions to significant achievements
in naval architecture and marine engineering in the form of  advances in
design, research, production, operation, or education."


In 2002 Jim Antrim was awarded the Professional Design Award by



Ultimate 24

     2003 Sailing World Boat of the Year -- Sportboat

     Sail Magazine - Top 10 Designs for 2003



Ultimate 20

     -1995 Sailing World Boat of the Year -- PHRF/Sportboat



Notable Records

Antrim/Ultimate 27

     Pacific Cup (San Francisco to Hawaii)
          2002 1st in Division, 9th Overall, 62 entries
          2000 1st in Division, 7th Overall, 70 entries
     2002 Antwerp Race, Belgium 
          Course speed record, 220 entries
     2000 Key West Race Week
          1st, 2nd, 3rd Place
     Newport Beach to Ensenada 
          1998 1st PHRF B, 5th overall 
          2002 1st ULDB-B, 1st overall ULDB 
     Around Catalina Island Race
          1998 1st overall PHRF
          1999 1st in PHRF-B
          2001 1st in PHRF-A
          2002 1st in ULDB-D
     Long Beach to Dana Point 
          2001 1st overall ULDB
          2002 1st overall ULDB
          1998 1st overall PHRF

Duffy Voyager

(62' Electric Power Trimaran)
    Newport Beach to Catalina & return
          Electric boat course record

Zephyr, Antrim 40 Trimaran

     2005 Ft. Lauderdale - Key West Race
          Course record: 15.7 knot average

Aotea, 40' Offshore Trimaran 

     Cover, Multihulls Magazine
     San Francisco to Japan
          Singlehanded Record 
     San Francisco to Hawaii 
          Singlehanded Record
     1991, 1993 Doublehanded Farallones Race
          1st to Finish
     1991 & '92 Three Bridge Fiasco, SF Bay
          1st to Finish, 1st Overall

Erin, A30+  Trimaran

     Cover, Multihulls Magazine
     1995 Doublehanded Lightship, SF Bay
          1st to Finish, 1st in Class, 95 entries
     1995 Doublehanded Farallones Race 
          1st to Finish, 1st in Class, 150 entries
     1996 Three Bridge Fiasco, SF Bay
          1st to Finish, 1st Overall, 215 entries
     94,95,99,01,05 Doublehanded Farallones Race
          1st to Finish

Some Press

Sailing Anarchy Interview

"Keeping It All Interesting, Jim Antrim Designs"  

     -Professional Boatbuilder, April/May 2002, by Steven Callahan


"The Wizard of El Sobrante"

    -Latitude 38 - June, 1994, by Shimon Van Collie

Contact Us


4018 Archery Way
El Sobrante, CA 94803

(510) 223-9680