Single Chine Hull: Design 325T: Tug Porker

Specifications:

LOA: 27 ft.-6 in.
Beam: 10 ft.
Draft: 3 ft.-10 in.
Displacement:11,000 lbs.
Construction: FG, Epoxy Ply (West System), Aluminum, or Steel
Recommended Power Commercial: 180 Hp Diesel
Recommended Power Pleasure: 55 Hp Diesel
Engine requires offset output shaft: 7-8 degrees.

Profile 325T


Plan 325T






May be built in pre-lam (sheet) fiberglass, epoxy/plywood, steel, or aluminum. The fiberglass pre-lam can be cast on a flat moulding surface using regular FG cloth and resin. Concave and convex fillets for hull and superstructure joints are cast in simple moulds. All the fiberglass pre-lam necessary for construction can be made up in advance with one long weekend spent on making the moulds and dedicated evenings thereafter for 6 or 8 weeks. For pre-lam GRP sheet or epoxy/plywood construction I recommend Gougeon Bros. epoxies and other components of the West System and their PRO-SET line of laminating resins rather than polyester type resins. This also allows you to use inexpensive styrofoam billets for making up cores and filler shapes. More detail on the technique which we developed for this hull is included in the tutorial. For commercial work aluminum is recommended, with steel as the first choice for heavy commercial use.
This is a single chine hull (flat bottom) with a full keel. 
Power requirements are economical and range from 55 to 180 SHP; for gunkholing and pleasure use a small diesel of 55 Hp is entirely adequate. Generally, higher hp engine installations are appropriate only for hulls constructed of aluminum or steel. There are two bulkheads and room for a porta-potty and sink, and for an overnighter you can unroll a sleeping bag/air mattress on each side of the engine. (OK at anchor but not while underway!)
As for all my tug designs, I do not propose a specific interior plan or engine/gear combination, preferring to allow you to tailor it to your intended use. Each hull built from the design becomes essentially a custom vessel. The Tutorials and Addendum give a reasonable amount of guidance to help you with your selection.
If you are more interested in a live-aboard lifestyle, look at Design 367TY Perk on the Tug-Yachts page. Porker teamed with a houseboat barge would be an ideal combination also. The barge could be moored while you devote the tug to other duties, like going for supplies and fuel, moving North or South with the seasons. See my ATB design, Pelagic, for an extreme example of this concept using a larger tug with twin screws. 


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Design and all rights reserved.
Copyright 2003 M. E. Low, Gloucester, MA USA
Revised 20 May 2003

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