International Mirror Class Association of Tasmania.


Toll Tasmania: Supporting Tasmanian Mirror Sailors

 

 

 

 

RIG COMMENT

Good to see a quick response of comments,  here is the reply from the UK Technical Officer and Measurer Martin Egan :

 

As I read it, the response from the Irish Technical Interest Group (IRL-tig) seems to be closer to their inital thoughts rather than their conclusion. This is not surprising as they have only just seen the rule change poposal. My point is that is seems a bit self contradictory in places.

They seem to be a suggesting employing a professional mast designer to design a 2 piece mast using a readily available "D" (I guess they mean "pear") section (integral track) with a tapered top and a joint that will work and not snag sails. The class (internationally) ownes this design and allows different mast manufacturers in the different countries to make and sell masts to this specific design.

At the same time they want it to be cheap, but I would have thought having a mast effectivly custom made, possibly using a section that the manufacturer did not normally stock or use would be more expensive than using a "off the shelf" section and joint design. Z Spars can retail a Mirror one piece mast based on a standard section for £180,  compared to Trident's custom offering for £260

I'm also unclear if such a "readily available across the world" pear section exists and what happens when whoever is manufacturing it decides to stop manufacturing it (like 5mm marine grade gaboon 3 ply).

Not only that, but a tapered and jointed mast is the most difficult to make and expensive possible solution.

This certainly would be more "one design" than having a more open choice of section and joint design. However I'm worried that the ideal crew weight range for this mast will be smaller than we currently enjoy with the gunter rigs, reducing the appeal of the boat.

Another snag is that Trident Weekender masts would be different to this new design, and so, out of class race wise. I've always been keen to word the rules so Weekender masts can race.

They want it to be simple, uncomplicated, robust and durable, yet at the same time they want a joint which has to make it less robust and durable.

They talk about the new rig making it simpler, more reliable and quicker to rig/de-rig than the current setup. But I don't know what they mean by this. Maybe, because the seem to store their boats with the mast down, they are saying there is little difference in rigging time between having to step the gunter mast and rig the sails and step the bermuda mast and rig the sails. If this is the case there is a simple one-step solution - leave the mast up unless you are trailing.

They thought the Trident mast could be improved on. The design was poor (agree), the build quality was poor (agree), it was too stiff (agree). They don't seem to think it would be the correct starting point for a "one design" mast (agree).