Technical Committee Interpretations
Requests for Rule Interpretations
following interpretations have been issued by the International
Technical Committee, approved by the International Executive Committee,
and are effective immediately.
Q: Is a 2:1 purchase system permitted
for use on the jib sheets?
This question arose based on some USA boats utilizing a 2:1 system
with blocks attached to the jib clew, plus turning blocks and additional
cleats being added at the front of the cockpit (near the coach roof)
to facilitate cross sheeting.
jib sheets are permitted to the extent allowed in Rule #D.4.1 (a)
(i) "Outboard padeyes for two part or direct heavy air headsail
sheet..." However, there is no specific permission given to
add additional hardware. Therefore, based on the J/80 class
rules being "closed class rules" under ISAF, the addition of blocks
to the jib clew and any other hardware not specifically approved
in the rules is prohibited.In the picture below, the ratchet block
for the jib sheet is permitted under #C.8.5 (a)(ii), but the "cleat
for jib sheet" is not permitted. 2:1 jib sheets are otherwise permitted,
with one able to secure the end of the sheet to any deck hardware
that is currently permitted in the Rules.
Q: Is it allowable to add an eye or other fitting to the stanchion
base for the purpose of attaching a gennaker turning block?
A: Yes. This request is a result of several older
boats having stanchion bases with leg welds that have broken, on
an otherwise still serviceable
stanchion. Newer boats have thicker bases. Permitting
a thru-bolted eye within the stanchion base foot print reduces
on the stanchion and does not change the intended function of the
Q: May one add an 1/8" Teflon coated plate under
the mast butt to facilitate adjustment? May one redrill the
factory holes in the mast bearing beam?
The mast length is fixed on all J/80s and no shortening or lengthening
of the standard spar (by adding a plate) is permitted. However,
one is permitted to drill additional holes in the bearing beam if
needed to properly tune the rig.
Can one use a block (such as a Harken 57) at the bottom of the mast
and same block at the top of the mast for the spinnaker halyard?
Many boats are shipped from the factory with a mast base block for
the spinnaker, so this is permitted. Adding a block high on
the mast for the spinnaker halyard is not permitted.
Can one use two cam cleats (such as Harken 150s) for the main halyard
instead of a clam or jam cleat?
Yes. The two J/80 builders have shipped boats with different
cleats for the main halyard and the use of cam cleats, provided
there are at least two of Harken 150 size, is permitted.
In lieu of a halyard winch, can one rig a purchase system on the
tail of the jib halyard for easier adjustment?
No. This is not specifically permitted in the Rules and has
never been standard equipment on a new boat. An owner currently
has the option to add a secondary winch for the halyard and/or a
block at the shroud base for sending the halyard aft to a primary