Single Chine Hull: Design 323c2T: Tug Pelikan

Awarded "Best Small Tug" at Boston Tug Muster
Specifications:

LOA: 21 ft.
Beam: 9 ft.-2 in.
Draft: 3 ft.
Displacement: 6500 lbs.
Construction: FG, Epoxy Ply (West System), Aluminum, or Steel
Recommended Power Commercial: 150 Hp Diesel
Recommended Power Pleasure: 36-50 Hp Diesel
Maximum engine with gear weight: 1000 lbs. Requires offset output shaft: 7-8 degrees.

Profile 323c2T






Plan 323c2T
  




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. I designed this hull to be beachable with partial bilge keels acting as stabilizers when beached. (What I'm saying is she has three distinct keels, one long and two short.) This increases wetted surface but on a low speed tug hull this is a no-brainer compromise. The bilge keels also allow the tug to be stored or hauled for painting without the need for a cradle; just a few keel blocks are required. Serendipity struck when I discovered that the specific design of the bilge keels gave the tug much more maneuverability than expected (Duh!). In fact, she will back "figure eights" in less than 3 boat lengths easily. This handling makes her an ideal workboat for tight quarters like marinas, mooring placement with the deck crane, construction, and general small waterway work. Note that the bilge keels do add some extra complexity to the construction and are optional.
Power requirements are economical and range from 35 to 160 SHP; for gunkholing and pleasure use a small diesel of 30 Hp is entirely adequate. Generally, higher hp engine installations are appropriate only for hulls constructed of aluminum or steel. A compact diesel is recommended, with a maximum engine weight of around a 1000 lbs. with marine gear. 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!)
In the version shown the forward compartment contains the fire pump for the monitor, which doubles as a heavy duty pump for de-watering vessels alongside, with appropriate 4" hoses. This pump is driven from the "nose" of the main engine, by a clutched shaft through seals in the bulkhead. The main engine also drives a 3 kw AC generator which augments the standard 12VDC system through an AC/DC breaker panel. The coffee maker (second only to the main engine(s) in importance on a tug) runs on 120 VAC as do the deck and flood lights. Everything but the coffee maker can be considered optional!
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 Pelikan 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 361TY Pouch, or Design 367TY Perk.  Pelikan 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. 




Design and all rights reserved.
Copyright 2003, 2012 Mal Low, Gloucester, MA USA
Revised 20 May 2003

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