Boat measurements

[John Kennett]

Originally Posted by Manos

On a RIB is the norm when you say that you want a 750 mtr RIB to actually get most of the time a 6.5-7ish LOA RIB. If you say you want an 8mtr RIB you will get again most of the time a 7.5ish mtr RIB and so on.

There's no doubt that manufacturers tend to round up to a certain degree, but I think that they are generally more accurate than that. Do you know of any RIB that is sold as a 7.5m which is actually less than 7 metres?

Agree, but I was making the point that when they say a min LOA 6.5 mtr RIB can enter F2 class the mean mean the boats hull LOA and not the total length with the tubes and IMHO should had been the other way round - TRYING TO GET IN THERE VERY HARD

I know that you are upset that your boat doesn't meet the requirements, but you are misquoting the regulations. You assumed that the measurements refer to the LOA, but you were wrong. They don't. As far as I can see there is no mention of LOA anywhere.

The RIB racing rules specifically say that measurments are as per P1 section D2 which says "The length must be measured between the perpendiculars of the external moulded hull length of the boat, taken at the extreme bow and the rearmost planing surface (the rear most part of the keel) including all hull planing steps (regardless of height), but excluding trim tabs, either fixed or movable" which is expressly NOT the LOA!

LOA is different from hull length. "Hull LOA" is a meaningless term that can only cause confusion -- it's either hull length or LOA.

John

[jwalker]

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 something like 6.5-7.0 metres. Do you know of any that are markedly different?

John

Sorry about the delay in replying JK, been out all night.

Yeh, I agree with you that a hull length of around the 7mtr mark is the biggest I would like to tow regularly and it was one of the criteria I had when looking for a hull. Initially I considered the Ribcraft 7.8 which has a hull length at approx 6.8 mtrs. Then the 7.5 Scorp has very short sponsons at the rear and that gives it a hull length of a little over 7mtrs. The Humber 8.5, which you might expect to be a bit on the big side, also gives a hull length of a little over 7 mtrs! A bit of cheating on Humber's part...maybe. The extra length of nearly a metre is at the rear and just tube so it doesn't really effect towing.
Since the tubes are on the water at rest and at low speed it does however give it a very different characteristic to the Scorp.

I'm sure there will be other craft with similar variations in hull length. Worth asking the question when enquiring I think.

Night night

[Cookee]

Originally Posted by Manos

Agree, but I was making the point that when they say a min LOA 6.5 mtr RIB can enter F2 class the mean mean the boats hull LOA and not the total length with the tubes and IMHO should had been the other way round - TRYING TO GET IN THERE VERY HARD

Sorry Manos - got to agree with JK here - the rule book (PB1) refers to "measured length" and "Length min or max" but not LOA. You want to race get a bigger boat?

[Jonny Fuller]

Originally Posted by Manos

John YOU ARE VERY WRONG my friend

ROTFLMFAO

[John Kennett]

Originally Posted by jwalker

The Humber 8.5, which you might expect to be a bit on the big side, also gives a hull length of a little over 7 mtrs! A bit of cheating on Humber's part...maybe. The extra length of nearly a metre is at the rear and just tube so it doesn't really effect towing.

I was just looking at the dimensions on the Humber web site and was struck by the vast amount of tube aft of the transom!

John

[jwalker]

Yeh, it's a Humber thing. .... However, I noticed the new Ribcraft 7.5 is just 6.4 inside the hull. As I said, keep yer eyes peeled.

[Jonny Fuller]

Originally Posted by jwalker

Yeh, it's a Humber thing. ....

Talking of 'Umbers', hows the build going?

[Rogue Wave]

I heard that Massey Ferguson are remodelling his cabin?

[jwalker]

Originally Posted by Jonny Fuller

Talking of 'Umbers', hows the build going?

Nearly done. Got it weighed on Friday. Phoned Volvo and got the calculation on the props. Gonna put another axle on the trailer, the extra weight has made it marginal as is, so that'll knock back the launch a couple of weeks.

Originally Posted by Waver

I heard that Massey Ferguson are remodelling his cabin?

Na, na, na-na, na.

[Jonny Fuller]

Go on then, how much does it weigh?....or is it a big secret!

[jwalker]

Nah, no reason for it to be a secret. 2820kg

[Jonny Fuller]

[jwalker]