Diesel Sail-drive: replace with outboard, inboard?

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  • 29 Mar 2023 14:10
    Reply # 13149352 on 13140149

    Has any Badger been equipped with a stern-quarter mounted, long-shaft, retractable, outboard motor, that can be lowered into the water when needed. I have heard it works well on 30 ft boats. Not in all conditions of course but for coastal cruising? A friend of mine who used one for cruising for many years on his 30-footer said this setup has an undeserved bad name. Perhaps 34 ft is just too big.

  • 23 Mar 2023 19:55
    Reply # 13142932 on 13140149

    Hi Arne and David,

    Yes, Arne, it HAS been a while! It is very good to get both of your replies and suggestions.

    I remember ASHIKI, but did not know that he had that engine well arrangement. And this on a pointy-sterned boat, too. I will look her up. Thanks for rummaging through your mags! Incidentally, since you both helped me a great deal with my conversion of ANNIE to JR in 2018, you may be interested to know that sadly I have had to convert her back to gaff rig as I was unable to find a buyer for her with her JR. SUCH a shame as she had such a great future under her new rig and had received so many sincere compliments. She had joined FROKEN SORENSEN and FOOTPRINTS as one of the best looking junks around (I'm not a bit biased, of course!) Well, she will look great under her old rig as well.

    Yes, FOOTPRINTS is one of my favourites and was a real incentive to convert ANNIE. But now we are talking about CONSTANCE, a Benford 34. I had forgotten FOOTPRINTS had a well. I am just not sure if a well would be possible in our case but will think of that more. A 9hp motor would be great instead of the hulking great 20hp diesel with its mass of exhaust boxes and hoses which take up so much room in that narrow bit of the boat. In our less sunny part of the world, we might need solar panels augmented by a trailing generator though I have no experience of them. We don't have much reliance on electricity luckily.

    I have only just read about HVO, a form of vegetable diesel oil, which apparently can be used in all engines. This might reduce the diesel fume properties of our current installation, which my family dislike so much. I had an ancient Isuzu Trooper for towing a mobile sawmill years ago. I used to put in a percentage of recycled cooking oil which sweetened up her fumes so much that my wife commented that it was like having a mobile fish and chip shop reversing up to the cottage door! 

    Thanks again for your help and I'll keep you posted on the outcome.

    Pol

  • 22 Mar 2023 03:39
    Reply # 13140417 on 13140149
    Deleted user

    You can certainly replace a diesel motor with an outboard. On Footprints, a 10 meter boat that weighed 5000kg we had a 9.9hp high thrust Yamaha 4 stroke outboard. It was very successful and did everything a small diesel engine would have done, except provide high output battery charging from an alternator. We used solar panels and a wind generator instead for battery charging. We used Footprints both for local coastal cruising, and for offshore sailing. BUT the outboard would need to be in an external well not open to the accommodation. This is for reasons of noise, fumes from the exhaust, and of course the explosion risk of petrol. You would also need a vented storage space to store the fuel. Ideally you would have some way of raising the motor out of the water when not using the boat and when sailing. On Footprints we could raise the motor vertically far enough to get the lower part of the drive leg above the bottom of the hull. Having had a lot of experience with outboard auxiliaries I think the Yamaha 9.9hp high thrust motor is the best motor for the job, and should be plenty big enough for your Benford yacht. 

    Last modified: 22 Mar 2023 04:39 | Deleted user
  • 21 Mar 2023 23:23
    Reply # 13140233 on 13140149
    Anonymous member (Administrator)

    Hi Pol  -  long time, no see!

    There used to be a JRA member named Gary King (Australia?), now deleted. He built himself a 30’ dory, stretched to 34’. He added an engine well and used an outboard engine. I am not sure where that well was sitting, but I think it was in the cockpit.
    Unfortunately, with his membership expired, most photos of his boat, Ashiki is gone too. I’ll have a look in the JRA Magazines.

    Cheers, Arne

    PS:
    Yes, check Gary King's article about his Ashiki in JRA Magazine 65, p.24-28

    Last modified: 21 Mar 2023 23:52 | Anonymous member (Administrator)
  • 21 Mar 2023 22:01
    Message # 13140149

    Hi All,

    Has anyone experience of fitting an outboard motor inboard in a yacht instead of an inboard diesel?

    Our boat is a 6 ton 34' Badger JR schooner. Plywood, flat bottom, with  a long keel and an outside rudder.

    We have problems with our 20hp Nanni diesel / Sail-drive combo which may make replacement necessary, and I am wondering if a 20hp outboard motor through the same hole in the bottom of the boat, or even a bit further aft, is a possible economical alternative?! In my ignorance I think it may be quieter than the diesel, take up less space, be a bit lighter and make less smell when running. But is petrol really any nicer than diesel?! (My family have a hatred of diesel fumes). I'm not crazy about the flammability of petrol but think this option needs to be considered. We have ruled out electric power due to cost, as we don't go into marinas or alongside unless we really have to, and we do too many deadlines currently, meaning frequent motorsailing.

    I envisage building a "well" around the outboard so that, should the arrangement leak, the leak will only drown the motor. Even that possibility could be reduced with a submersible pump in the well.

    I have room to move the motor aft a bit, another potential advantage of the arrangement over the current diesel.

    All suggestions would be gratefully received.

    Pol.

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