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Old 02-23-2017, 12:15 AM   #141
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Art - I don't think a sail conversion project would ever recover costs from fuel savings, unless you are circumnavigating.

In my eye, fuel savings are a very small advantage of a motorsailer. By far, stabilisation in rough water is the biggest plus to me. Other motorsailer advantages like "get home propulsion" and "something to tinker with" are also a big plus.
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Old 02-23-2017, 12:22 AM   #142
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When one approaches hull speed under power, a sail-assist rig will not add much. Works best when you're engine-powering below one-knot of hull speed. My one-knot-below hull speed RPM is 1800. If expecting any help from the sails, I apply only 1400-1600 RPM.
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Old 02-23-2017, 12:41 AM   #143
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cardude`s boat resembles a motor sailer. I think it`s a great idea. Does the build include provision for supporting the mast on deck, or will there be a post extending to the keel? I fitted a compression post to a small sail boat when I was concerned about how well the deck was tolerating the load.
Can you get enough sail area so it can just be sailed? Maybe a spinnaker, that would be fun, even a "gennaker", a hybrid genoa/kite.
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Old 02-23-2017, 07:56 AM   #144
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Convert trawler to motorsailer?

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Originally Posted by BruceK View Post
cardude`s boat resembles a motor sailer. I think it`s a great idea. Does the build include provision for supporting the mast on deck, or will there be a post extending to the keel? I fitted a compression post to a small sail boat when I was concerned about how well the deck was tolerating the load.
Can you get enough sail area so it can just be sailed? Maybe a spinnaker, that would be fun, even a "gennaker", a hybrid genoa/kite.

The sail version of this boat is keel stepped so that's what the rigger wants to do.

As far as getting enough sail on the boat so it sails without the engine, the sail plan with the 40' mast and just two sails won't be very speedy (maybe 3-4 knots if the sails produce 7-8 hp in 15 knots of wind) without the engine running at all, and like FF said the prop will cause some drag.

The spinnaker idea is interesting.

My engine makes about 8hp at about 1400rpm and burns about 1/2 gallon per hour doing that, so maybe a combo of 15 knots of wind and 1400rpm will get me about 6 knots. That's a 2400 mile range! I can make it to Hawaii now!


Can I run this little Yanmar at only 1400 rpm for long periods of time? I'm just kidding about Hawaii, but maybe I will cross the Gulf of Mexico one day.

For you sailors/riggers/mathematicians out there, what is the reduced stress on a rig with 700 sq ft of sail (the factory size rig) vs 377? Is it linear or logarithmic?
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Old 02-23-2017, 08:55 AM   #145
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cardude, I like the looks of the sailrig on your boat . It just looks right . Just think of all the extra shade you could hang off of those sticks when in the tropics . It would really increase your cooled off lounging area. Go for it man !
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Old 02-23-2017, 09:06 AM   #146
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cardude, I like the looks of the sailrig on your boat . It just looks right . Just think of all the extra shade you could hang off of those sticks when in the tropics . It would really increase your cooled off lounging area. Go for it man !

That was another reason for doing it, as crazy as that sounds. I'm constantly looking for places to hang my hammock. Lol.
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Old 06-22-2017, 02:26 PM   #147
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Convert trawler to motorsailer?

After two years of yacking about it, I'm finally doing it. Well I'm not-- Mack Sails in Stuart is doing the work.

A few pics. More pics coming this weekend after I go check it out in person.

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Old 06-23-2017, 05:25 AM   #148
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Sailboats get to go out in Blue water because of their construction.

Adding a mast to a motor boat does not change the vessels scantlings.

A parasail is easiest to rig , but simply slowing down to SL.9 will give low fuel burn,at no cost.
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Old 06-23-2017, 06:50 AM   #149
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Wow this is going to be interesting. Are you going with original sail plan that IP has for your boat ?
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Old 06-23-2017, 07:06 AM   #150
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Yes this is the sail plan the Island Packet folks drew up back when they were still Island Packet. Basically the same as the SP Cruiser, but with a little shorter mast and smaller sail plan due to a little less ballast in my boat, and because I wanted a low stress setup that would last quite awhile and be easy to single hand.

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Old 06-23-2017, 07:10 AM   #151
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I love it! Vertical stabilizers. You're trip to the Bahamas will be a great ride.
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Old 06-23-2017, 07:14 AM   #152
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Convert trawler to motorsailer?

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Originally Posted by FF View Post
Sailboats get to go out in Blue water because of their construction.

Adding a mast to a motor boat does not change the vessels scantlings.

A parasail is easiest to rig , but simply slowing down to SL.9 will give low fuel burn,at no cost.

True. I don't know how strong the scantlings were on the sail version of the boat, the SP Cruiser, which is what my boat is based on. I don't think the SP was ever considered a "blue water" boat by many when it first came out (big windows, small scuppers, etc). I remember IP did advertise that the boat had an "Ocean A" rating, for whatever that's worth. I'm not crossing an ocean, except for maybe to get to the Bahamas.

This project makes no monetary sense, and possibly no sense at all for most people. It's just something I've wanted to do for awhile and so I just decided to do it.
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Old 06-23-2017, 07:32 AM   #153
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I love it! Vertical stabilizers. You're trip to the Bahamas will be a great ride.

Ha! Yes, vertical stabilizers. Now I just need to figure what all these ropes (lines ) are for, and why they have all these funny names.
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Old 06-23-2017, 08:15 AM   #154
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I think it is a great project and I'm going to enjoy watching it come together.
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Old 06-23-2017, 11:09 AM   #155
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This project makes no monetary sense, and possibly no sense at all for most people. It's just something I've wanted to do for awhile and so I just decided to do it.
It is your money and your kids inheritance. You can spend it as unsensibly as you want!
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Old 06-23-2017, 01:57 PM   #156
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Better to convert motorsailer to trawler.
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Old 06-23-2017, 03:16 PM   #157
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I can't think of a better platform for a motorsailor. 1. Decent ballast (and designed for it), 2. hull already engineered in a highly successful sailing version, 3. nicely matched powertrain proven in tens of thousands of hours as an assist engine or primary power in the SP Cruiser versions. 4. Mack Sails is the ultimate rig designer for the job. They know Island Packetts and how to take advantage of the strong points of the design for that application.
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Old 06-23-2017, 03:25 PM   #158
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Looks to me Bijou was designed as a motorsailer and not a trawler, but built without the sail rig to make it a trawler.
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Old 06-23-2017, 03:38 PM   #159
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Convert trawler to motorsailer?

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Looks to me Bijou was designed as a motorsailer and not a trawler, but built without the sail rig to make it a trawler.

You are correct.
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Old 06-23-2017, 03:40 PM   #160
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I can't think of a better platform for a motorsailor. 1. Decent ballast (and designed for it), 2. hull already engineered in a highly successful sailing version, 3. nicely matched powertrain proven in tens of thousands of hours as an assist engine or primary power in the SP Cruiser versions. 4. Mack Sails is the ultimate rig designer for the job. They know Island Packetts and how to take advantage of the strong points of the design for that application.
Absolutely!
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