The Motorsailer PH7

November 4, 2011

The PH7 was a 50 ft. motorsailer, designed by the late Blaine Seeley and built in Taiwan. I purchased it cheaply in the summer of 1980, but then had to spend more than one year to outfit it decently.

The PH7 cruising somewhere in the Caribbean.

Big,slow, very comfortable and moderately seaworthy, due to the big windows of the house, I thought that I had the best of two worlds.  I could motor along and when pressed for range or the conditions were right sail.  Or so I thought.  To push that big and heavy boat at a decent speed needed a good 20 to 30 knots of wind and at that point sailing becomes very interesting, especially after a few nights with little sleep.  But you hardly have 30 knots winds in the Caribbean.

An aft view of the PH7 when it had an inflatable as a tender.  Later on the inflatable was substituted with an 11' Boston Whaler.

Then I discovered to my horror that between radar, autopilot, navigation lights, VHF radio, satellite navigation (the precursor of GPS) and refrigerator I used so much electricity (about 35 A) that after one night of sailing the batteries were dead and would take about 12 hours of generator time to recharge.  So let the generator run while sailing?  How stupid, when with little more fuel I could run the main engine and average 7.5 knots.  So the sail got demoted from main engine to steadying device, unless the conditions were handbook perfect.   Of course the electricity consumption and generation could have been optimized, but the wind conditions not.  Still the PH7 sailed from California to Florida (through the Panama canal) and all over the Caribbean.  It was fun, so much that I wanted to explore the Mediterranean with her, but something inside me told me that with the big windows of the house she was not suited to cross the Atlantic.  And I do listen to those subconscious voices.   And since a "boatless" period loomed ahead, I sold her.



An aft view of the stern, rudder and propeller.



The original interior layout from the brochure.  I did not make big changes,  only wallpapers, curtains and table tops were upgraded.

Click on the plan to get a bigger view.

Unfortunately the original is not very sharp.




Florida registration FL 5846DW

Hull number MRXI500020279
Panama canal identification number 738131

Radio call sign      WXF 9636

LOA 15.25 m 50' 0"
LWL  13.47 m 44' 2"
Beam 4.57 m 15' 0"
Draft 1.83 m  6' 00" 
Empty weight 16,300 kg app. 36,000 lbs app.
Keel 3,180 kg 7,000 lbs
Sail surface 76 m2 831 sq.ft
Mast height 17.10 m 56 ft
Fuel tanks 2,240 l 592 us gal
Oil tank 83 l 22 us gal
Water tanks 1,156 l 306 us gal
Hull speed (S/L = 1.34) 8.90 knots


The Original Brochures


Other Mariners

Ken Chapman, the owner of DreamQuest is trying to locate all the Mariners that have been built. Bill Kimley of Seahorse Yachts was told that 15 Mariner 50 were built from the mold before he purchased it to make some improvements and build the Mandarin 52.

His Dream Quest has the hull number MRXI500010179.  He thinks that the digits indicate hull number one built in January 1979.  What he thinks makes sense, except that the hull number of the PH7 is MRXI 50002079.  Obviously sometime ago I must have dropped a digit in front of the 79, which appears that the "PH7" was hull number 2, but the month built cannot be determined.

Anybody that has any information on the PH7 or the other Mariners 50 is welcomed to share his information with us.
The e-mail of Ken Chapman is


Hull number MRXI500010179 (hull number 1, built in January 1979), owned by Ken Chapman in Southern California.  

The boat is currently is going through an extensive rebuilt.  I wish him all the best, since a  Mariner 50 deserves all the love it can get.

The picture was taken a few weeks prior going on the hard. Notice that the waterline is low due to the engine, genset and all tanks being removed 


My old boat, hull number MRXI500020279 (hull number 2, built in February 1979).

Ken has located the new owners of the PH7 with the Florida registration number from this web site.  He has written a letter to the new owners, with no response yet.  Hopefully they will reply to his letter soon and provide status and information for this web site.


Second Wind

Hull number MRXI500030279 (hull number 3, it appears to be built in February 1979) , owned by Jim Landweer, 6748 Wing Point Rd N.E. in Bainbridge Island, Washington, phone 206-842-6748.  Jim doesn't have a computer so no e-mail or internet access

The boat is on the hard while Jim and his wife Shirley are building a large home that overlooks Pudget Sound with Seattle on the opposite shore.  Once finished he will turn his attention toward Second Wind.  He is also looking for a partner to assist with the refit and share the sailing in the Northwest.  

Ken Chapman visited Jim, his wife Shirley and Second Wind in the summer of 2004.

The PH7 (in the foreground) and her sister ship "Second Wind" in the San Pedro harbor (California) in the year 1980 or 1981.

Lady Hawke

Hull number MRXI500040379 (hull number 4, built in March 1979), owned by Mike Morehouse and his wife Marilyn, with Santa Cruz as her hailing port (South of San Francisco).

Mike with his wife Marilyn and their dog Bear made a trip South in August 2004 and got as far as the Channel Islands off Santa Barbara.  Ken paid them a visit in late September aboard "Lady Hawke" in their Santa cruz marina and had a great impromptu dinner aboard, shared pictures and talked about Mariner 50s.  Mike and Marilyn are planning to head South next year in the Fall and join the Baja Ha Ha to Cabo and the keep on going.

Sea Star


Hull number MRXI50006108 (Hull number 6, Coast Guard records indicate she was built in 1981, however from the sequence of hull numbers, October seems to be the month, but without the last digit after the 8, who knows exactly what year.  Another Mariner 50 mystery ) Owned by Ron Stone, located in Mission Bay, CA.

Ron has taken "Sea Star" north to San Francisco and south to Puerto Vallarta, Mexico.

Ron is currently replacing all the pilothouse windows.  He also has clear plexiglass stom windows that fit over all of the pilothouse windows, a great idea.


Mandarin 52

Believe it or not, Bill Kimley of Seahorse Yachts in the last years built a brand new motorsailer based on the original mold, making a few improvements.  The addition of the integrated swimstep added two feet of length, thus the 52.