Boat measurements

[jwalker]

< Edit: Split from the RIBnet project boat thread JK >

JK, look at the actual hull length when choosing the boat. It varies considerably between manufacturers for a given boat length. It can be close to metre variation in the 7 - 8.5mt range.

[John Kennett]

For a boat that is sold as a 7.5 metre I would expect that to be the overall length, meaning a hull length of something like 6.5-7.0 metres. Do you know of any that are markedly different?

John

[Matt]

Even my hardboat sold as 29'2 is actually 30'11

[Manos]

Originally Posted by John Kennett

For a boat that is sold as a 7.5 metre I would expect that to be the overall length, meaning a hull length of 6.5-7.0 metres. Do you know of any that are markedly different? John

John everyone knows that the RIB manufacturers measure the boats from bow to the end of the pontoons and not the hull LOA.
So yes is is different.
If you want a 750 RIB the hull LOA may be between 6.20-6.60. If you want a hull LOA of 750 then you are talking for a RIB total LOA (inc tubes) between 8-830 mtrs.
Now there are some manufacturers (very few) that measure the actual hull LOA. So you need to check.

[John Kennett]

Manos, there's no such measurement as "hull LOA". LOA means "length over all" which is the total length. Not the hull length.

Like I said, for a boat (and we're talking about RIBs here) that is sold as a 7.5 metre I would expect that to be the overall length, meaning a hull length of something like 6.5-7.0 metres. The waterline length would be a bit less still . . .

John

[Manos]

John YOU ARE VERY WRONG my friend

Shall I mentione the names BIBOA and RYA? Check with their rules and you will see. Also every book on RIBs and boats you look mentions this. I'm sorry but you are wrong

[John Kennett]

I am always ready to learn from an expert. Perhaps you'd like to explain exactly where I'm going wrong?

John

[Manos]

Check above. Just added a bit in about BIBOA and RYA rules.

LOA means Length Over All i.e. from bow to the end of the boat wherever that is. HOWEVER, there are two ways of doing it on RIBs, hull LOA and Boat LOA. So there you go. Examples, 8.5 mtr Scorpion Hull LOA 8mtrs (I think), 7mtr Falcon Hull LOA 6.10 mtrs. 640 mtrs Falcon Hull LOA 580 or as above can't remember etc etc

....and I'm NOT and expert (others are though), but I have a few Degrees including a Masters

[Seb]

LOA is the LENGTH OVERALL. OK, the 'rigid hull length' is less as rightly said but a boat model marketed with a measurement, i.e. Avon SR8.4, Halmatic Pacific 22, Ribcraft 585 etc etc etc is a reference to the LOA right?!

So, being educated or not is irrelevant. A RIB is measured as any other boat, from bow to stern. LOA again.

The actual hull measurement however is a simple figure that may be calculated if required. Its not, IMHO a 'standard' and recognised industry dimension. Its simply not needed.

Check some boat specs, do any of them state hull length or beam? Nope!

Just my views

[Manos]

Originally Posted by Seb

A RIB is measured as any other boat, from bow to stern. LOA again.

Yes it is on ships and cruisers (although there you take into account the swimming platform which is not a part of the boat) and it suppose to be for RIBs but it an't.
When you say I want a 7 mtr RIB you mean a 7mtr total length (OVERALL) not hull length.
When you go to a marina and you have a RIB you pay fees not on the hull length but on the OVERALL lenngth i.e. the total length from bow to the end of the pontoons. When you go on a ship with the trailer you again pay fees on the total length (OVERALL) and not the hull leght.
As I said check with MOST (95%) of the RIB manufatcurers how they advertise the length of their boats and what the actual hull legth is.
As the word says OVERALL LENGTH in naval terms means from bow to the of the stern. On a RIB in this case is the end of the pontoons for most of the manufatcurers as they are a part of the hull. for some others is from the end point of the bows to the end point of the hull stern.

Education makes a lot of difference by the way