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Celebrating Eleven Years Online...!
Home | Intro |
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The 32' Tug Yacht "TERRIER"Copyright 2002 - 2007 Michael Kasten
Watercolor © 1998 Lena Kasten Terrier Outboard Profile |
Terrier Interior P & A |
Perspective Forward |
Perspective Aft Updated 21 February 2007 IntroductionThis page provides a brief introduction to the Terrier design. You can also review the entire Vessel Specification which gives a complete description of the materials, structure, scantlings, paint, equipment, and so forth. The original intent of the Terrier design was to create a coastwise and offshore small motor yacht for family cruising. Terrier is capable of occasional light towing as well as long range ocean voyaging. Particulars are:
Having a design displacement of 15,500 lbs, Terrier is of medium weight, at D/L 319. Displacement will vary from around 14,000 lbs. when lightly loaded, to a maximum capacity of around 19,500 lbs. with tanks full, and the boat ready for a journey.
Power The diesel engine should be 35 to 50 horsepower continuous rating. If light-duty towing is anticipated or for continuous heavy weather traveling or for ice, the higher end of the power range would be preferred. Note however that a higher horsepower engine will only use more fuel, while not providing any greater speed. In other words, additional power will not be necessary unless extreme conditions or towing or ice would be regularly encountered. Displacement hull speed for Terrier is over 7.2 knots. Beyond 6.5 knots the resistance curve begins a steep climb and fuel economy suffers proportionately. For example, at 6.5 knots less than 15 hp will move the boat and consume around 0.93 gallons per hour, and a range of over 1,900 NM is possible. At 6 knots, using 10 HP the range would be close to 2,600 NM. At 5.5 knots, range would be above 3,000 NM unless heavy weather were a factor. A Vetus shaft assembly has been specified and is an excellent choice. A 2" shaft is correct for the 35 hp engine. Naturally an engine with more horsepower will require a larger diameter shaft. The propeller revolutions should be kept within the range of between 500 and 750 RPM. Therefore the gear reduction ratio will depend on the engine's rated RPM. Maximum propeller size is 25" diameter. In any case, a slower turning heavier engine will be a more dependable and more durable power source. An example of one ideal combination of power and drive train is the Lister Alpha 35 mated to a Sabb HVP-15 controllable pitch gear and propeller. In fact, this very combination is supplied by Sabb directly and can be shipped anywhere in the world at a very reasonable cost. The accommodations are intended for a couple with an occasional guest. As is, Terrier is a compact and tidy craft... just right! If a larger vessel than Terrier were desired, a good alternative is the Nidaros 38 design... Check it out...!
Plans and Vessel Specification One of our smaller motor vessels, we have provided the complete Vessel Specification for Terrier online. The Spec is given just as it would be supplied to the owner and / or builder when Building Plans are purchased. Terrier's Vessel Spec is offered here as an example of a typical small craft Vessel Specification. Larger vessels will always involve a much more elaborate Vessel Spec, amounting to some 50 or more pages. As always, the Vessel Spec. is accompanied by a complete Equipment List. Together with the first few drawings of the Building Plans, these documents and drawings make up our usual Estimating Plans packet. If the Building Plans are of interest, the Terrier Vessel Specification provides information regarding which plans sheets are included in the Building Plans packet. For more information please see our Plans List for the price of Building Plans.
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