I/O to outboard

Discussion in 'Boat Design' started by Rranger, Nov 26, 2020.

  1. ondarvr
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    ondarvr Senior Member

    That's a bracket not a pod/floatation bracket.
     
  2. brendan gardam
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    brendan gardam Senior Member

    I think I know what it is. It is a fully sealed aluminium pod. It does add some flotation when stationary.
     
  3. ondarvr
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    ondarvr Senior Member

    Sorry.

    From the pic it looks like a typical bracket.
     
    Last edited: Nov 27, 2020
  4. Rranger
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    Rranger Junior Member


    Thanks for the response good to hear in your other post the 125HP should be sufficient. I've thought about rebuilding the transom and cutting it to height and building a splashwell and hang it on the back and go. Still might. Your hull extention idea is that complete or a fiberglassed pod extention?
     
  5. brendan gardam
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    brendan gardam Senior Member

    Yes I can see that. Sorry for being rude. It is only 300x400mm. I got it cheap so I used it. Would have been better to do it properly though.
     
  6. brendan gardam
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    brendan gardam Senior Member

    i think if you want to do the work conventional transom mount and splashwell looks better and keeps the boat balanced.
     
  7. Rranger
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    Rranger Junior Member

    I’ve been doing a lot of wood burning and I’ve pretty much convinced myself conventional and splashwell is the way to go..
     
  8. brendan gardam
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    brendan gardam Senior Member

  9. brendan gardam
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    brendan gardam Senior Member

    This my latest project.(family made me give up sailing) . Po removed v8 volvo and fitted 225 merc on a pod. Goes really well but I think it is ugly. Would have looked much nicer mounted on the transom.
     
  10. ondarvr
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    ondarvr Senior Member

    There's good and bad with a splash well.

    The thing I don't like is you can lose 2-3' of space in the boat, so it can get cramped quickly. Many times going with a transom mount and splash well is cheaper, but if you need to build all of it from scratch, it may be a wash.

    Using a flotation bracket makes an existing hull feel an extra 2-3' longer inside, with a possible benefit in ride from the extended hull.

    Good flotation pods aren't cheap though, and it may take some fine tuning to get the performance right.

    I almost started a project like this one time, but after pricing everything needed, the numbers didn't indicate it was worth it.
     
  11. brendan gardam
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    brendan gardam Senior Member

    A hull extension pod in Australia is Around $5000
     
  12. Mr Efficiency
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    Mr Efficiency Senior Member

    I don't know about improved ride, it seems to increase porpoising, Brendan might be a judge of that, having converted a hull to a pod, and with before and after experience.
     
  13. ondarvr
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    ondarvr Senior Member

    I've done this before for other people.

    One complaint you hear is that the ride wasn't as desired after it was done.

    That's because so little thought was put into it, and they have no experience at doing it.

    Getting the right pod for the application is key, most just buy something thay find on Craigslist or a scrap yard and bolt it on.

    Get the right pod, then set it up correctly, height, prop, HP, etc. and most people are pleased with the result.

    Most people just bolt a bunch of scrap stuff together and head for the water, after that they say it didn't work.

    The cost of doing it correctly keeps people enjoying a good outcome.
     
  14. DCockey
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    DCockey Senior Member

    Does the splash well for a transom mounted outboard take up more room than the engine box for an I/O?
     
    Barry likes this.

  15. Mr Efficiency
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    Mr Efficiency Senior Member

    What is the right pod for one boat. might not be for another, I tend to think they work better on boats where the engine weight(s) is a lesser proportion of the total weight, otherwise you are getting the COG too far rearward. I may or may not be right in thinking that brackets and pods originated as a way to get more top end speed out of racing boats, that being the case, I am not sure what works for racing boats necessarily translates for recreational boats, where flat out speed is of little importance. Whatever the case, the main game now is to get more interior space, which is very useful, but if it results in porpoising tendencies, it looks like a doubtful trade-off in the boats so affected. I am particularly leery of pods on power cats, where stiffness in the longitudinal direction is not great anyway, when I see boats with "hydrofoils" being bolted on to outboards, on pods, the explanation is usually an attempt to stiffen the pitch, and not very successfully in smaller power cats.
     
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