Welcome to the catamaran design website of Derek Kelsall.

With over 40 years of specialising in Catamarans and composites, and developing the KSS (Kelsall Swiftbuild Sandwich) custom build process for professional and home boat builders, Kelsall Catamarans is the world leader in this field.

Design Plans

Arrangements

Resin Infusion

Frames for
Half Hull

Shaping and
Lamination

Modular
Assembly

2009 marks a milesone for Kelsall Catamarans. It was 45 years ago that Derek Kelsall completed the Trans Atlantic race in the first non-ballasted multihull. The 2009 race has just been won by a monohull for the first time in some years.

KSS 33 Hulls for Sale - Price Reduced

KSS explained for boat builders in NEW booklet

NEWLY Launched, the second of three, KSS 58's built by Ballotta, Peru

NEWLY Launched, the second of three, KSS 58's built by Ballotta, Peru

KSS-Triana. The first cat built to LLoyds 100A1 (1969).
A forty year old design - still sailing - described as "magnific" by the new owner.

New Design KSS P40 Ballotta In Build

New Design KSS P40 Ballotta In Build

Refurbished Typhoon - Tornado Hull & Rig, 16kts on 1st trial

KSS 46 Gillaroo in the Galapagas Islands. We like the seal on the step.

KSS 82 Bonefish Goes Alfoat, Tauranga, NZ

KSS 82 Design and Pictures

Aluminium - 43 footer - from GHI, Korea

KSS 39 by Ballotta Boats, launched Christmas 2008

New Design KSS 42 Kitiwake

Designed for modular construction/assembly

New Design KSS P46 JP

Designed for modular construction/assembly

See the Kiss Kat range.
For a trailer sail catamaran that is simpler, better and more convenient.
www.kelsall.com/kisskat

See our independent KSS contacts around the world

Join the KSS Boat Group

Derek Kelsall's blog is derekkelsall.blogspot.com