Large Catamarans

 

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Large Catamarans

LARGER CATAMARANS
DESIGNS & PLANS


Study Plans are available for these designs - remember a study plan gives you more details and a wood materials list usually on two A1 sheets, so that you can cost out a project before ordering the full plans. When you order the full construction plans you do not need to order the study plan as well, as all the study details are on the full plans.

We have just 3 designs - there are study plans (A1 sheets with sections, construction details and a wood materials list, for most of these designs - for further information please see the price list on the main page.

 

Note - In the particulars for each design, the dry weight is given for guidance only and will vary depending on the grade/density of plywood and solid wood used - different thicknesses of ply are often used by builders and the dry weight figure is based on the thinnest ply specified.
Also the Guidance Use comments are given in good faith and are based on feedback from previous builders etc and based on standard weight adults - contact us if you want further clarification before ordering/building.
E & OE

 

Catamarans on this Page

Cat 25 Cat 254 Cat 40

 

CAT 25  
The CAT 25 was designed to fit the Micro Multihull racing class as it was originally conceived. A set of plans is available to upgrade the standard design to fit the existing rules . Construction is similar to that of the CAT 19. Both boats incorporate external daggerboards which therefore do not encroach on the accommodation and are easy to install. 1/4’’ ply is used for most of the construction in both boats. LOA 25’0’’ (26’3’’ in MK2 version); Beam 14’6’’; Hull Beam 3’9’’; Draft min 8’’; Draft max. 3’8’’; Headroom 5’0’’; Dry wht. approx. 1850 lbs.; Loading capacity 1600 lbs. Sail Area 270 sq.ft.

Cat 25 Particulars

LOA 25' (26'3" in mk 2 version) 7.63m (8m in mk 2 version)
OA Beam 14'6" 4.42m
Hull beam 3'9" 1.14m
Hull Mid Depth 3' 3 1/2" 1m
Draft 8"/3'8" 0.2/1.12m
Sail Area 270 sq.ft 25.12 sq.m
Approx. Dry Weight 1850 lbs 839 kg
Load capacity 1600 lbs 726 kg
Maximum Headroom 5' 1.52m
Accommodation 4 berths with room for galley and wc
Engine 10 hp outboard  

Hull Shape

U with narrow flat bottom plus 2 planks per side
Construction Methods Ply over frame
Major plywood requirements for hull 28 x 6mm sheets
12 x 9mm sheets
Guidance Use Coastal/cross channel
Drawing/Design Package 12 x A1 drawings + 7 x A4 instruction/spec sheets
Additions and alterations included with the plans Mk2 hull with additional length
GRP hull construction
Larger sail plan with 325 sq.ft (30.23 sq.m) area

 

CAT 25 PLANS PRICE

UK/EU/US/Elsewhere - STUDY PLAN Ł25.00/FULL PLANS Ł220

(Study Plan approx. 30 Euros/$34 USD; Full Plan approx. 264 Euros/$297 USD)
 
 
CAT 254

Cat 254

Cat 254

This is the latest racing version of the CAT 25 and embodies a long waterline hull with a light weight construction using tortured ply. The pre-shaped sides are simply stitched to the bottom and epoxied at a set angle. The 6mm sides are then pulled up producing a round sectional shape. This gives a very light but stiff hull which simply uses bunk tops and shelves as longitudinal stiffening. Four berths can be fitted into the hulls along with basic cooking and toilet facilities to comply with the MOCRA Rules.  Apart from being a racing catarmaran the CAT 254 is also an ideal platform for fast cruising. LOA 26’3’’ (8.00m); Beam O.A. 16’9’’ (5.1m); Beam (Hull) 3’6’’ (1.07m); 1’9’’ (0.53m); Sail Area 375 sq.ft (34.5 sq.m.); Disp. Approx 1600 lbs. (725 kg.)

Cat 254 Particulars

LOA 26'3" 8m
OA Beam 16'9" 5.1m
Hull beam 3'6" 1.07m
Hull Mid Depth 3'5" 1.04m
Draft 1'9" 0.53m
Sail Area 375 sq.ft 34.5 sq.m
Approx. Dry Weight 1600 lbs 725 kg
Load capacity 1600 lbs 726 kg
Maximum Headroom 4' 1.22m
Accommodation 2-4 berths plus wc and galley
Engine 10 hp outboard  

Hull Shape

U shaped with narrow flat bottom plank
Construction Methods Stitch and tape
Major plywood requirements for hull 14 x 3mm sheets
32 x 6mm sheets
18 x 9mm sheets
Guidance Use Coastal/cross channel
Drawing/Design Package 6 x A1 drawings + 12 x A4 instruction/spec sheets
Additions and alterations included with the plans  

 

CAT 254 PLANS PRICE

UK/EU/US/Elsewhere - STUDY PLAN Ł25.00/FULL PLANS Ł250

(Study Plan approx. 30 Euros/$34 USD; Full Plan approx. 300 Euros/$338 USD)

 
CAT 40  
The CAT 40 is a comfortable cruising catamaran using the latest thoughts on wide bodied hulls enabling much more accommodation than usual on a catamaran of this length. The standard arrangement has 8 dedicated berths (including 3 doubles) with the ability to sleep many more.  There are 2 wc’s and a large galley and deck saloon along with plenty of deep stowage space, a large cockpit and inside and outside steering positions. Construction is based upon pre-shaped ply bulkheads and frames being slotted onto the ply hogs/stems so preforming the shape of the hulls accurately without the need for lofting. Obviously on such a capacious boat, there is much scope for alteration both in layout and in the basic use of the boat. She could for instance, be used purely as a motor yacht providing a very stable platform for diving etc. LOA 40’; Beam O.A. 25’; Beam (Hull) 7’3’’; Draft 3’7’’; Displ 8 tons; Sail Area 880 sq.ft.

Cat 40 Particulars

LOA 40' 12.2m
OA Beam 25' 7.63m
Hull beam 7'3" 2.21m
Hull Mid Depth 5' 1.5m
Draft 3'7" 1.09m
Sail Area 880 sq.ft 81.86 sq.m
Displacement 8 tons 8.13 tonnes
Maximum Headroom 6'7" 2m
Accommodation 8 berths (incl. 3 doubles) 2 x wc's, galley, deck saloon
Engine 2 x 20 hp sail-drives  

Hull Shape

U shape
Construction Methods Ply over frame (strip planked bottom option)
Major plywood requirements for hull 72 x 6mm sheets
158 x 9/12mm sheets
Guidance Use Offshore/ocean
Drawing/Design Package 11 x A1 drawings + 6 x A4 instruction/spec sheets
Additions and alterations included with the plans  

 

CAT 40 PLANS PRICE

UK/EU/US/Elsewhere - STUDY PLAN Ł30.00/FULL PLANS Ł400

(Study Plan approx. 36 Euros/$41 USD; Full Plan approx. 480 Euros/$540 USD)
 

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POSTAGE & PACKING (SHIPPING)
Please note - the plan prices do not include P&P charges which will be added to your order.
When ordering multiple items on-line we will always try to combine the packing and charge the lowest P&P cost option.
Go to Ordering Plans & Manuals for the Postage & Packing rates.

 

FOR DETAILS OF THE STITCH & TAPE
AND CEDAR STRIP PLANK
CONSTRUCTION METHODS SEE THE HOME PAGE