Friday, May 13, 2011

Design 1784-C1 - Jupiter

Although this is a sistership to design #1784, let's focus on her for a moment. Jupiter was built by T. K. Atkinson of Browns Bay, a suburb of Auckland, New Zealand, and launched in 1965. She was constructed of local woods using cold molded construction techniques. It has been said that by using care in her construction of both the hull and deck and her joinery the yard was able to shave 1,300 lbs from her weight and thus this weight was added to her ballast.

Here are the plans. My assumption is the "mark ups" found on the general arrangement have been drawn in after the fact and reflect what the boatbuilder actually constructed. Note the auxiliary engine below the cabin sole ingeniously connected to the propeller shaft by a chain drive system. She looks like a great cruiser/racer.

Principal Dimensions
LOA 42'-7"
LWL 30'-0"
Beam 11'-3"
Draft 6'-9"
Displacement 22,600 lbs
Ballast 12,300 lbs
Sail Area 725 sq ft


  1. Bruce:

    What is the sail just fwd. of the mast?


  2. Geoff,
    I believe that is a spinnaker staysail. You can do a search on the Internet and get some information about these but they are considered ineffective and outdated...