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Thread: Inboard vs. outboard

  1. #1
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    Default Inboard vs. outboard

    I spotted this work horse at the boatyard the other day and was wondering why there arenít more small inboards around.
    Itís basically a Hampton boat, 20-feet LOA, with a 6-foot beam. I would imagine that the engine is pretty substantial, although I wasnít able to get a look at it.
    To me, the biggest disadvantage to an inboard in a smaller boat is the space it takes up. Iíve worked on both, and would prefer the inboard. I would also imagine thereís not much difference in cost, given what they are getting for outboards these days.
    So, why is it that they are so rare?
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  2. #2
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    Default Re: Inboard vs. outboard

    inboard - 3 holes in the bottom of the boat
    outboard - 0 holes

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    Last edited by 2dogsnight; 03-09-2019 at 10:02 PM.
    1955 Fontana 18' - 1958 Atomic 4
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  3. #3
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    Default Re: Inboard vs. outboard

    Inboard: a cobbled together collection of cooling, charging, exhaust, propulsion, and fuel supply.
    Outboard: a precise interconnected unit built by robots.

  4. #4
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    Default Re: Inboard vs. outboard

    ^ What they said. Plus:

    Shallow draft
    Quieter
    Smoother
    Less Smoke
    Running aground incurs way less drama.


    Kevin
    There are two kinds of boaters: those who have run aground, and those who lie about it.

  5. #5
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    Default Re: Inboard vs. outboard

    And you can clean the weeds or fishing or anchor line off of the prop or change the prop a whole lot easier.

    In other words, simplicity.

  6. #6
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    Default Re: Inboard vs. outboard

    inboards come into their own on small boats when steam powered or when you need a semi-diesel

    whatever rocks your boat

  7. #7
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    Default Re: Inboard vs. outboard

    Other than all the previously mentioned differences, an inboard provides better weight distribution and trim being in the center of the boat.

  8. #8
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    Default Re: Inboard vs. outboard

    Simplicity of setup, ease of access for maintenance plus the new outboards have a much higher specific output. Seen of lot of them around here mounted on a bracket so no cutouts in the transom.
    Fight Entropy, build a wooden boat!

  9. #9
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    Default Re: Inboard vs. outboard

    Quote Originally Posted by phiil View Post
    Inboard: a cobbled together collection of cooling, charging, exhaust, propulsion, and fuel supply.
    Outboard: a precise interconnected unit built by robots.
    Some might see this as a point in favor of the inboard...

  10. #10
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    Default Re: Inboard vs. outboard

    Unless you make an interesting well, the outboard keeps you from backing against a dock or another boat and in general makes it harder to do stuff over the stern. And even "high thrust" outboards can't achieve the bollard pull of half the horsepower on a big slow turning prop.

    All in what you want.

  11. #11
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    Default Re: Inboard vs. outboard

    Try to motor against chop with the wind on the nose in a sailboat powered by an outboard. I've done it and it's a frustrating experience since the boat is pitching and the outboard is going in and out of the water. It's ok when there is no chop.
    Will

  12. #12
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    Default Re: Inboard vs. outboard

    The trick now is to get the outboard to sound like that semi-diesel. I could use that as relaxing music to fall asleep by.

  13. #13
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    Default Re: Inboard vs. outboard

    Do they make diesel outboards?

  14. #14
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    Default Re: Inboard vs. outboard

    Yanmar has a diesel outboard - have not seen it yet...

  15. #15
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    Default Re: Inboard vs. outboard

    The Yanmar outboards got killed off in the EU due to emissions, but allegedly, commercial users can still operate them. Fish farms in Scotland were using them some years ago.

  16. #16
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    Default Re: Inboard vs. outboard

    Creationists aren't mad - they're possessed of demons.

  17. #17
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    Default Re: Inboard vs. outboard

    Then there's servicing. The outboard can be taken to the shop without the boat. Repowering? Pretty quick update. But for long-range cruising, you really do want an inboard diesel.
    -Dave

  18. #18
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    Default Re: Inboard vs. outboard

    Gofer Steam Laddie!
    Bird

  19. #19
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    Default Re: Inboard vs. outboard

    Ah open steamboats. Like the Fire Canoe of McConnell Island in the San Juans. Tommy Thompson's creation.

    Elect a clown expect a circus

  20. #20
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    Default Re: Inboard vs. outboard

    Different horses for different courses. Pick the horse for the course.
    Hope for the best, but plan for the worst.

  21. #21
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    Default Re: Inboard vs. outboard

    Quote Originally Posted by navydog View Post
    Do they make diesel outboards?
    https://youtu.be/-jeMYeqUhmk

    Just watched that link this morning
    Skip

    ---This post is delivered with righteous passion and with a solemn southern directness --
    ...........fighting against the deliberate polarization of politics...

  22. #22
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    Default Re: Inboard vs. outboard

    Yanmar used to make 27 and 45 hp diesel outboards. Only sold them in certain markets.

    John Welsford
    An expert is but a beginner with experience.

  23. #23
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    Default Re: Inboard vs. outboard

    I would suspect that a lot of the “desire” today is basically a marketing driven “mob mentality” that has been nurtured and developed by the manufacturers. Basically a “let’s see here, I can build an inboard where I have to do all the work, design the system, assemble the components, align everything and then cover it all under my warranty ,... OR,.... I can build an empty boat, bolt some big outboard to the back and wash my hands of any and all warranty issues, and charge the same money. Oh Mr. new boat shopper(!) you want to buy this one over here with the outboard on the back and the lady on the bikini inside,....... Duh,... ok, that must be the better one because it has the bikini in the picture”...
    Thats how a lot of it works.

    I’ll take an inboard any time from about 16’ and up.

  24. #24
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    Default Re: Inboard vs. outboard

    I see everyone is carefully avoiding inboard/outboards. Is that because they're the best of both worlds, or the worst? I know how I feel, but living near a big lake, I bet 90% of the powerboats here are I/O.

    One of the big advantages of an inboard is that you still have steering when the engine is in neutral.
    "If it ain't broke, you're not trying." - Red Green

  25. #25
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    Default Re: Inboard vs. outboard

    Quote Originally Posted by Garret View Post
    the best of both worlds


    Simpler is better, except when complicated looks really cool.

  26. #26
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    Default Re: Inboard vs. outboard

    25 or 50hp rotary Wankel diesel outboard anyone?


    http://www.wankelsupertec.de/en_application.html

  27. #27
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    Default Re: Inboard vs. outboard

    Quote Originally Posted by Edward Pearson View Post
    25 or 50hp rotary Wankel diesel outboard anyone?


    http://www.wankelsupertec.de/en_application.html
    Can you imagine someone taking that into a regular outboard shop for a repair? There'd be some head scratching!
    "If it ain't broke, you're not trying." - Red Green

  28. #28
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    Default Re: Inboard vs. outboard

    Small outboards have some clear adwantages. A self contained unit that you can lift off the boat and carry onto the attic for winter storage all on your own. No propeller drag when rowing. Cheap and simple.
    From let's say 5 hp and upwards the adwantages of an outboard become fewer. The motor becomes heavy to carry. The weight of the motor and the amont of power requires a wide and deep transom which is more detrimental to rowing than the drag of a propeller. Outboards must be built light and consequently have a short lifespan.
    As the boat cannot be rowed comfortably you will always have that vulnerable propeller sticking out under it. You cannot protect an outboard motor the way you can protect the propeller on an inboard powered long keeled boat.

    So..... I am a fan of inboard motors.
    Amateur living on the western coast of Finland

  29. #29
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    Default Re: Inboard vs. outboard

    Has anyone mentioned cockpit space? Unless the boat is large enough to allow for fitting the inboard under the cockpit sole... that lump is going to take up some territory in your cockpit. Smart designers often turned that into an 'advantage' by using the engine cover as a table for entertaining, bait prep & filleting table, etc.
    David G
    Harbor Woodworks
    https://www.facebook.com/HarborWoodworks/

    "It was a Sunday morning and Goddard gave thanks that there were still places where one could worship in temples not made by human hands." -- L. F. Herreshoff (The Compleat Cruiser)

  30. #30
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    Default Re: Inboard vs. outboard

    Around here it is quite common in upen boats to have the motor box as a sort of partial partition between the cockpit space from which you steer and navigate the boat and the work space or hold space..... or passenger space.
    As the top of the motor box is flat it makes a good chart table or picknick table.

    However I have seen quite a few designers who have made gotten it all wrong.
    Amateur living on the western coast of Finland

  31. #31
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    Default Re: Inboard vs. outboard

    Another advantage to the outboard is the potential for shallow draft. Just tilt it up some and motor on.

    So...Is an outboard in a well an inboard?

  32. #32
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    Default Re: Inboard vs. outboard

    Quote Originally Posted by navydog View Post
    Do they make diesel outboards?
    Yep.

    https://www.oxe-diesel.com/
    Fight Entropy, build a wooden boat!

  33. #33
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    Default Re: Inboard vs. outboard

    oxe is now mercury racing
    for smaller ones yanmar has a new 50 hp diesel that they brought the technology for from a European developer. 800 cc turbo.
    z

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