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Old 23 September 2013, 04:30   #1
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How to measure a RIB

I am trying to find som data on an old RIB. There is no ID plate so not easy.

When I measure from transom to front end of tube, measures 5.0 meter but what about the distance from transom to the rear end of tube ?

Cheers T
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Old 23 September 2013, 05:34   #2
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I may be wrong, but should you not measure from bow to stern, i.e. the actual length of the boat, including the transom to end of tubes
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Old 23 September 2013, 06:04   #3
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At our marina they measure from the extremes, that includes anchors sticking out of the front and anything hanging over the back.

There was a charter company a few years ago who attached swim platforms to 32' yachts and chartered them as 34', we saw them around the Greek islands and couldn't believe it.
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Old 23 September 2013, 09:05   #4
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Hi,

Why do you want to know / care? If it's because you are being charged for storage then most (but not all) will measure to the furthest extremes.

Steve
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Old 23 September 2013, 11:27   #5
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In general (at least in the US), OAL is measured from the furthest forward point (including anchor rollers, etc) to the furthest rear permanently mounted point (on a RIB, usually the tube cone.) If a motor bracket is bolted on such that the motor extends beyond the tubes ends, it is not figured in. I believe this is to keep cabin boats from claiming a larger length by means of swim platforms and the like.

This, however, is a matter of interpretation, and manufacturers may use different measurements when figuring OAL. As Dry Run says, it doesn't matter a whole lot.

jky
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Old 23 September 2013, 12:26   #6
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LOA is the same in the UK. If you want to get an accurate measurement, drop a plumbline from the furthest forward part of the tube/anchor roller and again from the rear tube cone. Mark this on the floor with a piece of timber or similar, extended to the centre line of the boat, then measure between the two along the centre line. Remember that some manufacturers overstate LOA, so a 5.9 metre boat might be listed as a 6m etc.
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Old 23 September 2013, 13:58   #7
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i was of the belief that ribs are measured overall, but yachts were measured at the waterline - ie where the bow and stern emerge from the water, of course im probably wrong!
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Old 23 September 2013, 13:59   #8
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thinking about it, that would make sense for a displacement vessel as its waterline length determines its theoretical top speed.
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Old 24 September 2013, 11:38   #9
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Quote:
Originally Posted by Festinghouse View Post
i was of the belief that ribs are measured overall, but yachts were measured at the waterline - ie where the bow and stern emerge from the water, of course im probably wrong!
I'd guess it depends on whether you're looking for LOA for calculations (as in your hull speed figure) or berthing (where you'll need room to fit the entire length of boat.)

Marina's I suspect, would use the larger figure (especially since that translates to more money.)

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Old 24 September 2013, 12:21   #10
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Best Way to MEASURE A RIB!?? Easy!!.. FULLY Laden in Force 7 Wind against Tide!
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