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Major Tom

Member Since 05 Jun 2008
Offline Last Active Today, 03:53 PM

Posts I've Made

In Topic: Foiling Laser

18 November 2015 - 06:12 PM

Look really inefficient, like an ancient prototype foiling moth, I am sure that a non foiling laser will be faster as when the boat is in low riding mode the drag of the foils will be massive.

In Topic: Traveler Designs

16 November 2015 - 04:51 PM

Shorter main sheet with centre sheeting, makes leeward mark rounding a a lot easier.

Assuming (big assumption) the same mechanical advantage, I don't think so. 
Lets say the boom is 8 feet long. 2:1 mainsheet at the stern, or 4:1 mainsheet in the centre.
according to my sums then with the boom 90 degrees out its 
5.66 ft from centre of boom to centre sheeting point, * 4 way purchase = 22.6ft
11.31ft from end of boom to end sheeting point * 2 way purchase = 22.6 ft.
In practice of course the numbers aren't that neat, but the principle applies. You can't save much weight by centre sheeting since the principle vertical loads are kicker (vang) and leech, not mainsheet.
It all comes down to ergonomics really, what setup do you prefer. In particular how you are going to get the tiller extension past the mainsheet. With a very long tiller extension (IC. Moth for example) you can't use a stern bridle unless you are happy to have twin tiller extensions.
With a centre main sheet you are able to have better choice over the amount of purchase you need, for eg, aft sheeting is generally either 1:1 or 2:1. If you are sheeting from the centre of the boom you have the choice of 3:1 which gives you a purchase halfway between the two aft sheeting options, the reality is on a Laser most of the purchase is being used to bend the rig, a 1:1 would be more than sufficient to pull the main above the leeward aft corner of the deck if there was a fixed bridle and not a traveller.

In Topic: Traveler Designs

15 November 2015 - 06:30 PM

Shorter main sheet with centre sheeting, makes leeward mark rounding a a lot easier.

In Topic: Movable Ballast Systems

15 November 2015 - 05:59 PM

Wtf has this got to do with dinghies? Groundhog Day............

In Topic: Balast Jackets

10 November 2015 - 07:22 PM

Wore weight jackets on a Laser for about 10 years with no damage to my back, there were limits and they were strictly enforced at major events. However, I believe there were far more injuries among Finn sailors as they carried a lot more weight and after racing a Finn is a lot heavier to drag up the slip with tired back muscles. As a lightweight (at the time) the weight I carried allowed me to be far more competitive and actually, in a strange way, enjoy my Laser sailing.