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How do you measure an inflatable??

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  • How do you measure an inflatable??

    How do you measure the length on an inflatable?? I have (what I thought, and what's registered as) an 8'6" inflatable with a hard floor. I always thought it was measured either on overall length or from the transom to the bow. Yesterday I measured mine and it comes up as 7'6" from transom to bow, and over 9'4" overall, neither of which matches the 8'6".

    What's the correct way?? We're looking at getting a bigger one, but now not sure what size we really want.

  • #2
    You have a Hard Floor on a Sib or Rib inflatable ?

    For measuring sibs lenght you need to : deflate the air keel, flip it up side-down, place a tall verical wooden, metal bar standing perpendicular at front bow tube, place a horizontal bar touching both cone ends, measure the distance between both bars in a straight line.

    Click image for larger version  Name:	Locker Lenght.JPG Views:	1 Size:	172.6 KB ID:	10867601

    For Ribs the entire hull must me measured that's front bow area to transom's end in straight line as in pic.

    Check if any of your Sib's lenght measurements dials same, near of what stated ?

    Happy Boating
    Last edited by Sea Rider; May 20th, 2020, 10:36 AM.


    Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

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    • #3
      Mine is a SIB with a plywood inserts for floor and an inflatable keel.

      Are you saying on a RIB it's just the glass hull from transom to bow?

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      • #4
        Originally posted by km1125 View Post
        Mine is a SIB with a plywood inserts for floor and an inflatable keel. Are you saying on a RIB it's just the glass hull from transom to bow?
        Will depend entirely on the fabricator, at least on mine being a 450 mtr Rib is what the hull lenght measures aside from the tube collar. On sibs, there's a 3 +,- % allowed tolerance regarding lenght mesurements. By how far will the lenght of your sib be different from the stated form of being measured ?

        Happy Boating


        Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

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        • #5
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          " how do you measure an inflatable "

          with some sort of flexible tape measure l'd imagine...
          when fully inflated of course,

          I know, l'm going....

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