Design 177 – Sea Hawk 21
6.5m Island Hopper

177 Sea hawk 21
Other Drawings:

Gen. Arr. (with Magnify Tool).
Interior Plan & Profile.
Outboard Profile & Deck.

LOA 6.500 m 21' 4"
LWL 6.000 m 19' 8¼"
Beam 2.430 m 7' 11¾"
Draft 0.550 m 1' 9½"
Displacement on dwl 1650 kg 3,638 lbs
Outboard Engine 7 to 11 kw 10 to 15 hp
cruising Speed 2.56 m/s 5.0 knots
EU Category C - Inshore
The Sea Hawk 21 Island Hopper is designed for very straightforward construction in ply and epoxy, from CNC cut parts if wished.

As her name suggests she is basically designed for short sea trips, though of course she is equally suitable for coastal, estuary and lake cruising.

She has a round-bilge displacement hull with a cruising speed of 5 knots (5.75 mph; 9.26 kph). Top speed with, say, a 10 to 15 hp outboard, will be about 6 knots (7 mph; 11 kph.

The hull is designed for simple lapstrake construction – a fairly narrow flat bottom strake with five hull strakes. The frames are made from three layers of ply and the edges are stepped so that the strakes will fit directly to them.

The detailed and accurate plans together with true step-by-step building instructions carry builders, professional and non-professional alike, through the building process simply and easily. And for larger boats particularly, they allow a managed build to be carried out very successfully. Plans are fully dimensioned; no scaling or lofting is required. The plans and instructions are practical, clear and detailed, containing everything required to build and complete the vessel. Where CNC cutting files are included, or available, they can be sent directly to a CNC facility as required. Professional technical support throughout the build, is available by email, via the forum or by regular mail. More plan info