"JetPac" Can this be put on a Macgregor 26 somehow v. 150hp

Discussion in 'Boat Design' started by Ry Labo, Aug 14, 2012.

  1. Ry Labo
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    Ry Labo New Member

    Hi there I don't know enough about Macgregor's for this and it seems the manufacturer doesn't either, do you know if the 150hp version of the JetPac could be put on a Macgregor 26S. Could a Macgregor 26 be modified to have one (In Canada the hp regulations {overpowering} are more lax, and if you get in insured the Coast Guard won't want to get in the middle of it). This isn't a normal outboard, it is lower and more aft, and would only add weight of 500lbs so instead of a 250lbs outboard it's like having two. If the water ballast is always full and the Macgregor is always in the water, could it be ok, even if it means you cannot open full throttle. If it is a bit destabilizing, how could that be changed as needed. how much weight and where, maybe more buoyancy somehow. Also how much can the Macgregor hold in weight on the water safely, and how can that be modified to hold more as well. This JetPac could be converted to run waste vegetable oil, and is very attractive for it. The only other diesels are old Yanmar, and only 35hp, which isn't made anymore. I'm considering buying a Macgregor 26S 1994 version very soon, and I hope somebody can please help me with this, thank you,

    regards Ry

    heres the link to the Jet Pac outboard: http://www.daytonamarinepropulsion.com/ and
    http://www.fleetwatermarine.com/JetPac_ ... system.htm

    my email is killa_kat@live.com
     
  2. baeckmo
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    baeckmo Hydrodynamics

    Adding some 15+ % of the all up weight aft of the transom does seem a risky undertaking. It will alter the balance of the vessel completely. I am sure there are better solutions. Note that this is a boat designed for sailing; the power / weight ratio you are suggesting here is downright dangerous for this hull.
     
  3. Ry Labo
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    Ry Labo New Member

    if anybody knows a cheap boat, that is like the Macgregor, and can definitely hold this outboard can you tell me (one that still could go fast with it, so probably still a 26")
     
  4. Ry Labo
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    Ry Labo New Member

    and has a cabin, and can hold weight, maybe even mre than the macgregor 26
     
  5. WestVanHan
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    WestVanHan Not a Senior Member

    Lots of boats out there Ry,hit up craigslist.

    As for putting it on a Mcgregor, take a close look at your life insurance and see what they will or won't pay out on-and I'm not kidding either.
     
  6. Ry Labo
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    Ry Labo New Member

    i read on another forum that HP calculation is 2 x W x L -90, which for the Mac if I put it at 23" length (waterline), and really low ball it even for Transom Width at 5", that makes the Macgregor 140hp, and with 6" width at 186hp. I think I made a mistake earlier as I was going off of a comment on another forum that the weight of the outboard is 500 lbs, I've herd that it's 100% self buoyant, so it's like pulling weight, not holding it up
     
  7. whitepointer23

    whitepointer23 Previous Member

    a mac 26 with a 50 hp 4 stroke outboard is fast , quiet and economical, putting a diesel on there will just make it slow and noisy.
     
  8. WestVanHan
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    WestVanHan Not a Senior Member

    IIRC from what I heard a 50 will give 22-25 mph,guys put on 70-90 hp and do 30 mph.

    In this area with all the whales,orcas,and deadhead logs around there's no way I'd do that speed that close to the water and with lousy visibility over the cabin.

    Even with my boat at 30 knots and high up it's tough to see logs/whales quickly enough-thats why I very rarely do it.
     
  9. PAR
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    PAR Yacht Designer/Builder

    I'm not sure of the MT 1" on the Mac 26, but I can tell you the extra weight that far away from the CB will dramatically affect her trim, likely by several inches.

    The Mac 26 will not like being pushed as fast as the 150 HP might get her and frankly, the idea is way over the top in regard to reasonable. The boat is admittedly a huge compromise, on both the sail and power side of the coin and you want to step way over the line for reasonable, on one side of this equation? Yea, good luck with that . . .
     
  10. CDK
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    CDK retired engineer

    A MacGregor 26S probably doesn't take overpowering well. It has an eggshell hull with lots of resonance. My son just returned from a one week trip with a rented one, powered by a 90 hp Honda. The deafening noise, instability and lack of thermal isolation cured him from wanting to buy such a boat.
     
  11. Manie B
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    Manie B Senior Member

    Bad idea period.
    and everybody will agree once they see this pic
    can you imagine a Macgregor with this lot hanging of its bum
     

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  12. rwatson
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    rwatson Senior Member

    Thats a very surprising statement. Hondas I have used have just purred, and my 75 Tohatsu, not the quietest of beasts, was a just a nice hum at speed.

    The Mac has an inner liner, which very few power boats have. It makes for good thermal protection and great noise reduction in my experience.

    I cant understand "instability" problems How many people on board ?. In calm water the Mac tracks fine with a crew of 4, and in heavy weather, the water ballast makes it a very stable cabin cruiser.
     
  13. whitepointer23

    whitepointer23 Previous Member

    that is what i have heard from 2 mac owners as well. they are very happy with them.
     
  14. WestVanHan
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    WestVanHan Not a Senior Member

    ...and we all have forgotten that it's a jet he wants to put on.

    Outboards with jets are rated about 2/3 the hp of a prop-with the same engine.

    So his 150 hp jet is about equal to a 100hp prop unit,but with the poor holeshot and response-closer to 90 IMO.
     

  15. CDK
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    CDK retired engineer

    I wasn't there, he chartered the boat 200 miles south of our island. Before the trip he had set his mind on buying one, but this one week changed his opinion. They were with 2 adults and 2 kids, rented rooms 3 times because it was too hot to sleep on board. A sudden gust almost capsized them on the first day (sailing), his wife injured herself because the boat seems to have an unusual hatch and they found the noise of the Johnson 50VRO on his speedboat soothing after the McGregor.

    The only thing I can verify is the ultralight construction. My own boat has the same length and weighs 3.5 tons, the McGregor about 1/3 of that.
     
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