Siam 25 Plans

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Printed plans shipped and PDF plans emailed from Selway Fisher
$41.00 - $628.00


The Siam 25 has been drawn up as a open dive and fishing boat for a client in the far East that can also be used for simple family trips around the islands. Her hull has been based on the Rathlin 20' motor launch hull - a robust and stable design. The design is very adaptable - some will want to remove the rig completely and others may just fit the mizzen as a steadying sail. The hull will also take more extensive accommodation.

Details for both an outboard well and for an inboard engine installation have been included. The cockpit can drain into the outboard well.

Construction is Western Red Cedar strip ith plywood bulkheads - the bulkheads may be set up on the building jig and used as moulds.

The accommodation drawn is a simple open arrangement with an open backed wheelhouse which accommodates a basic wc compartment and galley. The remaining space is open under a simple awning


Siam 25 Particulars

LOD 25' 7.62m
Beam 8'8" 2.64m
Draft 2'9" 0.85m
Sail Area 353 sq.ft 32.80 sq.m
Approx. weight 3300 lbs 1500 kgs
Ballast 850 lbs 400 kgs
Maximum Headroom 6'4" 1.93m
Accommodation Open wheelhouse and cockpit with separate wc and  galley in the wheelhouse
Engine 27 hp inboard or 10 - 25 hp outboard

Hull Shape

'U' shaped round bilge
Construction Methods Strip plank
Major strip wood requirements for hull 1000m of 22x33mm ( 7/8" x 1 1/4") Western Red Cedar
Guidance Use Coastal/cross channel
Drawing/Design Package 11 x A1 drawings + 6 x A4 instruction/spec sheets
Additions and alterations included with the plans  
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