Messing about in boats since 1975.  Online Since 1997.

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The 49' Classic Motor Yacht


The 49' Motor Yacht QUINN - Kasten Marine Design, Inc.
Exterior Profile | Deck Plan | Interior Profile | Interior Layout
Sail Plan | Lines Perspective | Color Sail Plan

Kasten Marine Design, Inc.
Copyright 2003 - 2016 Michael Kasten

General Concept

Quinn is an adaptation of the smaller power yacht, Moxie. The proportions and layout of Quinn are intended to maximize the interior for two, and to stay under 15 meters LOA. Another version is the 50' Renegade, essentially the same as Quinn but with a subtly different profile and slightly more displacement.

Moxie, Quinn, Renegade... each of them are an expression of my own ideal as a Power Yacht. Each of them has an extremely simple shape and light displacement, so will be inexpensive to build and to own. They are especially economical considering the generous amount of living space they provide. They are long and lean, so have modest horsepower requirements therefore conservative fuel use.

The arrangement on Quinn allows plenty of room for a couple and occasional guests, plus a big pilot house and cockpit deck. The aft 'party deck' as I call it could be screened in if needed, or enclosed by awnings. The large fore deck is perfect for sun tan adventures, and for stowing shore boats while under way.

Such a vessel is ideal for boating in the Pacific Northwest, including the wild and beautiful cruising waters extending from Seattle to Juneau, or for cruising the Columbia River, the San Francisco Bay estuaries, the US Intra-coastal Waterway, the Florida Keys, the canals of Europe, the fjords of Norway, the island coast of Chile, the Great Barrier Reef.... in other words, any of the interesting coastlines of the world.

For my own use, a more perfect power boat type is hard to imagine.

Power And Range

Range under power is a matter of providing the required fuel capacity for the preferred vessel speed and the intended destinations.

Per the Beebe algorithm, at passage making speeds of 7.4 knots with 600 gallons of diesel fuel, assuming a 12% reserve and a specific fuel consumption of 16 hp/gal/hr, range for the steel version will be approximately 3,000 miles, and at 7 knots, around 3,500 NM. The aluminum version is approximately 7,000 lb lighter, therefore will have a bit more range at those speeds, or will have the same range with a 15% reserve.

If built using light weight materials, an engine of 65 hp will push Quinn along at a "normal" hull speed of around 9 knots. Due to being long and sleek however, Quinn has a much higher speed potential of around 11.5 to 12 knots. At 11.5 knots in the fully loaded condition the power required will be approximately 130 hp. This is well within the intermittent rating of the John Deere or Lugger four cylinder turbo diesels.

A Sabb controllable pitch gear is planned, along with a Helseth three blade controllable pitch propeller.


Quinn is optimized for construction in aluminum.

Quinn is also a candidate for steel construction, in which case beam is 6" greater and the hull, aft deck, bulwarks and house sides are 10 ga. steel. To save weight, the fore deck and pilot house top structure are cold moulded wood.

Whether steel or aluminum, all parts will ideally be NC cut by plasma arc or water jet. The NC cutting process leverages the work already done to create the computer model, allowing structure to be easily defined directly from that computer model. The resulting "boat kit" makes for very fast assembly. Once the parts have been pre-cut and delivered, the frames and other internal structure are quickly erected, the stringers placed, and the plating applied.

To further optimize the design for steel, the 50' Renegade has been developed, having 12' - 9" beam , a subtly different profile, a little more freeboard, increased headroom, and slightly more rake to the stem.

A Sail Rig on a Power Boat...??

An optional Sail Plan has been drawn. The sail rig is of course not meant to win sailing races. It is for the sheer fun of sailing, for use as a get-home strategy in case of engine failure, and in order to extend the range under power when winds favor. If Renegade had been intended primarily as a sail boat, sail area would have been greater and the keel configuration optimized for that purpose. In this case, the primary objective was for ease of handling, therefore the Junk rig was chosen. For more information on the advantages of this type of rig, check out our web article on Junk Rigs.

Without the sail rig, a paravane rig would be provided for roll stabilization. With the sail rig, the weight of the rig helps attenuate rolling motions. If the sail rig were chosen, the paravanes would still be an option.

In Summary

For a couple seeking a comfortable life afloat, Quinn and Renegade offer the basics and also several luxuries. In terms of finding the perfect personal power yacht, Quinn or Renegade would be my own first choice.

The primary appeal of this design (to me anyway) is the excellent accommodations, combined with the economy of construction and powering. Guests can be accommodated by conversion of the pilot house dinette into a large double, or by conversion of one of the saloon settees into a double. The covered after deck allows one to be an observer of life on the water; the spacious galley and saloon allow the luxury of excellent meals afloat; the large double berth forward; the shower & tub... Nice...!

As the vessel becomes larger, the layout possibilities become much more numerous. For example, a larger prototype at 58 feet has the possibility of additional sleeping cabins or a separate office.

For more information on these vessels, please feel free to contact us... Also, you may want to check out the 43' Moxie Article written about the Moxie design by Steve Knauth in Soundings Magazine.

49' Dream-Yacht QUINN - Kasten Marine Design, Inc.

Other designs in the "Peregrine / Renegade / Moxie" Family:

36' Molly | 43' Moxie | 49' Quinn | 50' Renegade
61' Peregrine | 82' Peregrine | 100' Amazon | 164' Peregrine
60' Pennywise Trimaran | 70' Peregrine-on-Thames