Hull Length

[SuperPiper]

ISO 12217-2 uses hull length LH in its calculations. LH seems to be different from LOA and LWL. It is defined in ISO 8666 but I don't have access to that standard.

Could someone please post a sketch and/or the formula for LH?

It will be much appreciated.

[Doug Lord]

SP, I found this reference:
202. HULL LENGTH (Lh) : ( EN/ ISO 8666 §5. 2. 2)
The hull length must not exceed 9,50 m.
Reminder: This measurement does not include rudders and their fittings, bobstay fittings, devoid of devices designed to lengthen the waterline, nor pulpits and pushpits, solar panels and wind vane autopilots.

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From the 9.5m racing rules. We may have the standard at the lab-if you still don't have a good enough answer by Monday I'll check.

[ruysg]

Definition from ISO 8666:

The length of the hull, LH, shall be measured in accordance with 5.2, one plane passing through the foremost part
of the craft and the other through the aftermost part of the craft.
This length includes all structural and integral parts of the craft, such as wooden, plastic or metal stems or sterns,
bulwarks and hull/deck joints.
This length excludes removable parts that can be detached in a non-destructive manner and without affecting the
structural integrity of the craft, e.g. spars, bowsprits, pulpits at either end of the craft, stemhead fittings, rudders,
outdrives, outboard motors and their mounting brackets and plates, diving platforms, boarding platforms, rubbing
strakes and fenders.
This length does not exclude detachable parts of the hull, which act as hydrostatic or dynamic support when the
craft is at rest or underway.
With multihull craft, the length of each hull shall be measured individually. The length of the hull, LH, shall be taken
as the longest of the individual measurements.

[lewisboats]

Sounds like LoD

[SuperPiper]

ruysg, thanks for the direct quote. That is great. I will use this information.

But check this link from the dark side. If you scan down to the specs, you will see that LOA, LH and LWL are all quoted. LH is less than LOA but longer than LWL. Now, I'm confused.

http://www.teamspeed.com/forums/luxu...bs-2009-a.html

Sorry about using a powerboat as an example.

[gggGuest]

.32 metres - about the size of the pulpit maybe...

[ruysg]

It's natural that LWL<Lh<LOA. Since Lh and LOA include the hull, they will be bigger than LWL. And LOA normally includes parts not included in Lh, such as pulpits, and swiming platforms.

By the way ISO 8666 doesn't define LOA. I guess the closest to LOA would be Lmax (Maximum Length).

Ruy