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What is it?

F41 is Ian Farrier's first catamaran design. Ian Farrier is already famous for his folding trailerable trimaran designs

F41 is a 12.7m long, 7m wide bridgedeck catamaran design. The hulls are 11:1 length/beam, and the boat is well canvassed (60 square meter main, 27 square meter jib) with a 16.5 meter mast. The boat should be finished somewhere between 11,000 and 13,000 pounds, which gives a Bruce number of about 1.3... so it should be a competent sailor. It's not a beach cat, but it is not a condomaran either.

using boat rating calculator , the F41 at 13,000#, 0# ballast(!), 965 sq ft sail, 42' LOA, 40' LWL, 23' BOA, gives D/L = 91 and SA/D = 28. in contrast the Hobie 16 has D/L=73, SA/D=51.6.

• F41 mailing list

  I started an email list for F41 related discussions. You can sign up for it by sending email to majordomo@employees.org, no subject, body of "subscribe f41".

  if you just want digests subscribe to f41-digest, or look at the archives here

• F41 information from Farrier Marine

• my boat, hull #6, Tiger Shark

  look at the building progress pictures

  for this boat the emphasis is on excellent performance and modest appointments. correspondingly the fitout will be:

  • sailing rig has main, fractional jib, and asymmetrical spinnaker, instead of screecher/genoa/etc.
  • the "regular" sized boat with 6' standing headroom, instead of the 6'6" option (which gains windage and loses side deck width)
  • transom hung rudders, instead of underhung (which gains simplicity and lightness and control authority)
  • daggerboards, instead of centerboards (which gains simplicity and loses the drag from the centerboard slot)
  • aluminum mast, instead of carbon (which saves $$$ and gains serviceability with "conventional" material)
  • bow pole made of ? oh heck we go back and forth between carbon and aluminium. how bad could an extra 100 pounds really be?
  • dual steering stations, port and starboard
  • interior layout 76kb: galley up on bridgedeck, nav station too; 3 cabins probably with queen size berths (1980mm x 1500mm), one head with shower (don't need two heads, are we going sailing or are we sitting around?)
  • wood: for interior trim only, Macrocarpa, New Zealand Cypress This is neat stuff! it looks great, a light honey color; is a hardwood, but is soft enough to be reasonably machinable; best of all harvest is sustainable! it takes oil very nicely (varnish too). it smells good.
  • 25hp Mercury outboard motors, instead of inboards (save weight and money, no diesel smell, no drag from outdrives or prop shafts, no through-hull fittings, no heat or oil or exhaust inside the boat, less noise, etc.)
  • 2x105Ah 12v batteries, instead of more appliances, batteries, generators, etc.
  • just a small (50 to 100 liter) refrigerator, not a freezer. enough to keep drinks cool and veggies fresh, insulin, etc.
  • targa bar will hold solar cells and antennas (VHF, GPS, radar, omega/decca/loran/satnav :)

  building and fitout contract

  Fosters' mast proposal section , and Fosters' base rendering

  Boat #6 is being built by Aeromarine in Timaru, New Zealand. Ken Wood is the coordinator.

  Kenwood Yachts coordinates custom built boats, sells Farrier's plans, sells used boats.

  Aeromarine builds lots of stuff, including power boats, shower stalls, and giant water slides. Aeromarine has built several F36 trimarans.

• other F41 web pages
  • #2, Paul Symes
  • #10, Ian Maxwell

• Other stuff

• Port Of Timaru, NZ

• How to avoid California state tax: CA BOE publication 52, Vessel exemption from California use tax

• Oanda currency converter

• ORC Category Zero regulations

• COLREGS 72

• SOLAS

my Hobie Trifoiler web pages

my homepage