Sitting height cabin

Discussion in 'Boat Design' started by brendan gardam, Sep 20, 2020.

  1. brendan gardam
    Joined: Feb 2020
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    Location: east gippsland australia

    brendan gardam Senior Member

    Just wondering what height cabins with sitting headroom normally are. Is there a standard dimension.
    I measured with myself sitting on a chair and came up with 1.5 m. Does that sound right or too high.
     
  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    There is a whole bunch of anthropomorphic data collected in the 1950's for a DoD standard on human factors engineering and now used everywhere.
    The latest version is MIL-STD-1472D https://apps.dtic.mil/dtic/tr/fulltext/u2/a281401.pdf
    Here is a typical example that has been rolled over to commercial apps.
    Reference: Common Dimensions, Angles and Heights for Seating Designers - Core77 https://www.core77.com/posts/43422/Reference-Common-Dimensions-Angles-and-Heights-for-Seating-Designers

    Edit: BTW for the 95% man, the reach of the arm above the seat is 147.2 cm for ground troops and 153.2 cm for aviators based on 1960-70 data, so you might want to add a few cm as the 95% has increased slightly over time.
     
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  3. brendan gardam
    Joined: Feb 2020
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    Location: east gippsland australia

    brendan gardam Senior Member

    Reading your info I think 1.5 is pretty close to what I need. Thanks.
     
  4. clmanges
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    clmanges Senior Member

    I'd think you'd want to be able to stretch your arms straight up without touching the overhead. For me, sitting in a chair with 17" seat height, that comes to about 66".
     
  5. DCockey
    Joined: Oct 2009
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    DCockey Senior Member

    The controlling dimension for "sitting headroom" is headroom above the seat, not above the floor/sole. Height of the seat above the floor/sole can depend on numerous factors including comfort and required space under the seat.

    Clearance above the seat is usually based on sufficient space for the occupant to sit upright (not slouched) which is referred to a seated height or sitting height. Allowance is needed for headware (caps, hats, helmets, etc) if appropriate. Typical specs for 95th percentile seated height are around 36 inches/960 mm. That spec does not work for 5 percent (more or less) of the population. 39 inches / 1000 mm fits all but a few people.

    If a boat has an enclosed head then it is usually desirable to have sufficient clearance above the seat of the head for all potential occupants of the boat to be able to sit upright.

    If the occupant wants to / needs to stretch arms directly above their head then considerably more space is needed. Many smaller boats cannot accomodate that much height in areas intended for seated headroom only.
     
  6. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    Also depends what kind of wheelhouse/boat you're in too, as the Capt./Master.

    On our current vessels, we have around 1300mm..as this is because the Capts like reach the internal ship-wide comms radio which is directly above them.
    The Capt doesn't need to move, just reaches up from his sitting helm position to the mic above his head - to make an announcement.
     

  7. brendan gardam
    Joined: Feb 2020
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    Location: east gippsland australia

    brendan gardam Senior Member

    My 1.5m is from the sole. The head is full height in one hull. The cabin will only be to house a convertible dinette. I checked 1.5 against the boat and it looks pretty right.
     
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