Time for another megapost <img src=icon_smile_dead.gif border=0 align=middle> from me.
As I understand it, the Enterprise class (like Cadets and other boats of that era) had their plans published from the beginning. That's why there is no licenced kit or panel manufacturer for the class. Mirrors have only ever been available as a kit.
Going back to a point brought up by Tim Smith, Trello and Dave Hughes about old boats with certificates and the current rules. When the class became International there were a lot of changes to the measurement rules in order to limit the possible variations in hull shapes (under the original rules I understand you could, and did, get huge variations). This was when the measurement stations were brought in, making things a lot tighter. In the UK the prescriptions of the UK MCA were changed to allow the hulls of old boats to be "grandfathered" up to UK Nationals level. This means they can be legally raced at UK events up to and includling the Nationals, so long as the hull complies with the class rules in force when they were certificated. This prescription is still in force.
I think the panel replacement rule came in as a response to a situation that arose in Sidmouth around 1991 when a large number of boats were completely or almost completely rebuilt using locally purchased timber and ply. I understand that in some cases the sail numbers of existing boats were used and so two boats existed with the same number. These boat were measured and successfully raced at MCA events. There was a lot of concern within the IYRU (now ISAF), RYA and Class at the time about this practice. At the time the International rule 7.5 required "... Materials used in alterations, replacements and repairs shall be equivalent to those originally supplied with the boat." However, the UK MCA prescriptions went further saying (14d) "..... A boat repair or rebuild that exceeds one third of the original hull shall use Kit part supplied by a licened Kit manufacturer and a new boat number or a rebuild identification shall be issued".
So back in 1991 the sort of repair that Andy has carried out, replacing the bottom panels of a boat with locally purchased timber was legal both in terms of the International rules and the UK Prescriptions at the time.
If Mirror sailors from that era had been happy to leave it at that, then there would have been no need to change the rules. I wasn't involved with the change, so I don't know why the UK prescription was not adopted, one problem may have been that ISAF won't allow imprecise phrases such as "..one third of the original hull.." in new rules. It would have to be more specific (such as, say,"...no more than 5 panels ",...)
Reading through the posts it seems to me that allowing more scope for repairs (back towards what was allowed in 1991) would address may of the issues raised in this forum. As I see it, the problem for those of us charged with making the rules, is one of control - how do we allow genuine boat repairs but without allowing it to be used as a mechanism for either building a new boat without paying a building fee (infringing ISAFs copyright) or building a boat with a race advantage over boats built from genuine kits ?
Don't forget that ISAF use the number of building fees paid each year as a measure of activity within the class. You may see it as an unnecessary overhead, but given the small number of new boats being built each year, it wouldn't take much to start making it look to ISAF like the class was less active than it was.
If the class (in the UK and worldwide) want to allow repair using locally purchased timber or allow building from plans, then the rules can be changed. But there are a number of concerns which the class will have to address and possible consequences, in particular:
<b> Control of materials </b>
I've already touched on this - how do we ensure the correct material and the correct thickness or size has been used. There seems widespread agreement that this should be done, but how ? How do I measure, for example, the thickness of a stern deck or an aft bulkhead (no hatch) on a completed boat ?
<b> Control of panel shape and, in turn, hull shape</b>
How do we ensure that the panel shape of each new panel conforms to panel shape in the kit specification ? It's the shape of the panels which largely determine the shape of the hull. Some of the panels (like the bulkheads), can't even be fully accessed. Even where some sort of template could be laid on a panel, I can envisage difficulties telling where a panel ends and the ajoining panel starts. Even if it can be done, it will, no doubt, take longer to measure the boat. You might find fewer and fewer people prepared to undertake boat measurement and to get a boat measured will cost more money.
<b> Protection of ISAF copyright </b>
How do we ensure that allowing genuine repairs using local timber is not used as a mechanism for avoiding paying a building fee ?
If we allow building from plans, then they will have to be professionally produced (i.e. will cost money) & ISAF will want a fee for each new boat built - I don't have an exact figure, but the building fee will probably closer to £100 than to £10. Once again, how do we ensure that we don't get boats build without numbers or that old numbers are "re-cycled" and used on new boats ?
Still waiting to hear where I can buy 5mm gaboon marine grade 3-ply.
That all for now <img src=icon_smile_dead.gif border=0 align=middle>
PS - Andy, did you take the decks off (in an afternoon) ? If not, how are the inside bottom panel to side panel joins taped ?
Edited by - MartinEgan on 25 February 2006 14:44:08
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