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A 42' Ketch For Voyaging

"ZEPHYR"

Copyright 1996 - 2007 Michael Kasten

 

The Concept

Here is a design based on the excellent yachts from the mid 1900's. These yachts are not just elegant, sleek and graceful, they have the kind of hull form that behaves well on the briny deep. For blue water travel they are comfortable, safe, fast, and weatherly.

 

Design Details

Zephyr is a medium displacement spoon-bow, counter-stern ketch, with a well balanced combination of beam and depth, and with a long fine run. The swept back full keel provides excellent tracking at sea. Zephyr has the attributes of sleekness, grace and speed, as well as a hull form that will stand up to a press of sail for windward sailing.

Principle dimensions are:

  • LOA: 42' - 0"
  • Beam: 12' - 2"
  • Draft: 5' - 5"
  • Displacement: 26,775 lb.
  • D/L 328

Conceived primarily for ocean voyaging, steel construction has been chosen for its incredible strength.  The single chine hull form was chosen on the basis of its simplicity, economy of construction, performance, and in order to blend well with the classic aesthetic of the design.

The keel configuration provided gives Zephyr the best combination of windward ability and excellent tracking at sea. The keel profile can be seen here, and is the same as that of Highland Lass II.  The raked back forefoot and the "drag" to the keel bottom are the elements that provide for excellent steering stability. With this type of keel, the boat will not require a steering vane and can instead use a simple sheet to tiller steering arrangement. The keel is a NACA low drag / high lift foil in order to provide both speed and good windward sailing.

The after-deck is raised in order to give more storage room in the lazarette as well as more leg room for quarter berths.  The main benefit to the raised afterdeck is increased reserve buoyancy aft, thus a dry area for the helm.

 

The Interior

The interior layout is intended to be the same as that of the 42' schooner Highland Lass II.  With Highland Lass' schooner rig, the mast positions have largely determined what's possible with the interior.  Therefore, in the forepeak there is a good sized chain locker.  Aft of that, a settee is located port and starb'd and a table is hung on the mast.  Just aft of the settee, a large galley is located port and starb'd. A ft of the galley there is a head to starb'd and a chart table / hanging locker to port.  Two quarter berths are located right aft.  The engine box is arranged to also serve as a bureau-top between the quarter berths.  With this layout, one can sleep four when needed, and two in relative luxury. 

An alternate layout is quite similar to that given to the 36' Grace.   The main mast position on Zephyr allows there to be a generously sized double berth forward.  Aft of that, to port and starb'd are two 4.5' long settees with a table between.  Since Zephyr is much larger than Grace, there is quite a bit of extra length available for the rest of the interior.  Given the excellent use of space provided by use of a pair of quarter berths aft, that is the ideal choice.  As compared to Grace, all the remaining extra space amidships is donated to a slightly larger galley, and a much more generous head compartment, and combination hanging locker / chart desk opposite.  In other words, the quarter berth, head and chart desk area would be the same as is designed for Highland Lass.

 

The Rig

The ketch rig works well for ocean cruising and provides a generous sail area.  Zephyr has used a gaff mains'l in order to limit overall mast height.  The mizzen mast provides a good hand-hold  when emerging from the companionway.  The mizzen mast serves as the compass binnacle, and an awning can be spread over the mizzen boom. 

The ketch rig provides quite a number of well-balanced sail combinations.  The main and the stays'l when used alone have nearly the same balance as the whole sail plan, and will allow easy tacking in close quarters. The boat will also tack easily with only the mains'l set.  Another equally well balanced combination is just the mizzen and the jib, to keep the foredeck clear while stowing the ground tackle - appropriate for getting under way from an anchorage.

One of the main benefits of the ketch rig as it is drawn is the manageable size of the sails.  The mains'l is 319 sq. ft. and is well inboard where it can be handled safely and easily.

A sail plan option we have drawn for Zephyr includes a few additional sails for trade wind sailing, hung from a cross-yard is located above the gaff saddle.  This allows a lower course and raffee to be set flying from the deck.  These two sails add some 500 sq. ft. 

 

Summary

Zephyr was designed immediately following a rough and wet passage down the Pacific West Coast in the early 1990's.  During that sail, the ideas for Zephyr came together in the form of several sketches, and were then worked into the design you see here.  The features presented above emerged as the result of having wished for each one of them on that trip. 

The result is, I think, excellent.

What would I change...?  Not one thing really.  If desired, one could easily provide a Bermuda rigged main sail, or possibly just more sail area - perhaps by scaling up the sail rig of the 36' Grace...

For more information about Zephyr, please inquire.


Please see the Plans List page to review our available Boat Plans.

Michael Kasten
Kasten Marine Design, Inc.
michael@kastenmarine.com
www.kastenmarine.com 
Modern Classic Yacht Design
Washington; Arizona; Sweden

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