OKDIA AGM: draft agenda

[davecooper]

The draft agenda for the OKDIA agm at Puck is on-line at https://www.okdinghy.co.uk/docs/OKDIA-AGM-Agenda-2015.pdf. You’re invited to send any comments or corrections to
[email protected]
Dave Cooper

[bradjohanson]

Agenda change:

7 (a) Boom dimensions
Old rule
13.4 The depth of the boom, including the sail track, forward of the outer point shall be 70mm ± 20mm and the width shall not exceed 37mm.
New Rule
13.4 The depth of the boom, including the sail track,from 200mm from the centre of the gooseneck hole to the outer point shall be 70mm ± 20mm and the width shall not exceed 37mm.
Reasoning – most booms have tapered front ends. This just brings the rules into line with current practice
Question:
Many boats also have booms tapered at the aft end, why not a 200mm taper zone to the outer point as well? Are old booms grandfathered?
I went thru photos from one regatta in Germany and I found at least five boats with aft tapered booms. If we are bringing the rule into line with current practice where do we stand on aft tapered booms?

Brad Johanson
USA-1010 and CAN-500

[bradjohanson]

New Rule
8.3.2 Single skin timber boats may add a layer of plywood, with a maximum thickness of 4mm, for reinforcing in the cockpit only.
Amendment 1. Cockpit reinforcing as described in 8.3.2 may only be used in boats with no stringers.
Amendment 2. Cockpit reinforcing as described in 8.3.2 is limited to an area of 0.90m2
Amendment 3. Cockpit reinforcing as described in 8.3.2 may extend 50mm from the Bulk-heads at Stns 1 and 2.
Amendment 4. The type of plywood used for cockpit reinforcing as described in 8.3.2 must be no heavier than the plywood used in the skin of the boat

What happened to the 8.3.2 change approved at the 2014 Annual General Meeting? It does not show up in the current class rules.

8.3.2 All framing and longitudinal stiffening, including stringers, shall be consistent throughout the boat.
Reasoning: Again this removes a grey area on whether stringers have to run the length of the boat or not.
Carried: 8 for (NED, POL, FRA, AUS, NZL, SWE, GBR, GER), 0 against.

If this meant to replace that 8.3.2 or be an additional rule?

Amendment 1 why should only boats without stringers get the benefit of a cleaner, safer, more comfortable, dryer cockpit?
Amendment 2 this should be enough to have the extra panel tie into the two stringers each side in the rest of the hull (assuming we don’t pass amendment 1)
Amendment 3, this makes structural sense (and I assume we can also extend the stringers past stations 1 and 2 say 150mm to make a fair transition between the stringers and the floor panel when building a boat with stringers (assuming we don’t pass amendment 1)
Amendment 4. One builder builds a 5mm bottom and then vacumes in a light 4mm plywood inside everywhere except in the cockpit where he vacumes in a heavy 5mm plywood to meet the 10% thickness rule. Can he then add a 4mm heavy ply or 4mm light ply?

[Greg]

Hi Brad

the booms are allowed to be 70mm deep as a minmum. Most are way more and some are tapered through the aft band as outside of that it is basically free area. Or has been treated as such anyway. Some were too tapered and being less than 70mm +/- 20mm had a can or something similar stuck in the end to make them comply.
This change makes booms that are rounded at the front so they do not hit the mast legal. That is basically all it is doing. If a boom was never legal it cannot be grandfathered as that can only apply when a rule makes something illegal that was previously alright. As the measurement includes sail track it really only affects the front end where this has often been cut away.

hope this explains it

cheers
Greg

[Author]

Posts