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Major Tom

Member Since 05 Jun 2008
Online Last Active Today, 07:53 PM
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Posts I've Made

In Topic: Tantra 2014-A Performance Daysailer

Today, 07:18 PM

Don't feed the troll.........

In Topic: Can a 29er sink?

Today, 07:16 PM

The total positive bouyancy in a 29 er is approximately 1 sheet( 3 m2) of 8 mm 80 density foam, 3 sheets 5 mm 80 density foam and about 1/3 sheet of 6 mm marine ply. I doubt if this will offset the total weight go the gelcoat, cloth, resin, bonding paste, fittings, fasteners, spars, sails sheets etc etc. the foils almost float so will supply a bit of added volume to the above calculation!

In Topic: D Zero

Yesterday, 03:37 PM

If you sheet block to block with no vang you are in effect using the tension on the leech to bend the mast, there is no forward component on the lower section from the boom. The top section will be close to its maximum bend due to the limited bend in the lower section.
If you crank the vang on, almost as much force that is pulling the boom down is also pushing it forwards inducing bend into the lower section. This flattens off the lower part of the sail and as the top section is not as loaded it allows better gust and chop response from the upper leech.
General rule on a Laser is if you want to point higher ease the vang while staying block to block as this straightens the rig and increases leech tension.

In Topic: D Zero

17 September 2014 - 08:42 PM

You can ask Daniel about that.
 
Certainly on a laser, the fact that you have both the ability to vang sheet and the ability to traveler sheet is an advantage.  The vang bends the mast differently than the sheet does, for the same amount of leech tension.

On a Laser, by the time you have as much leach tension on the main using the vang as you would get sheeting block to block with the main sheet, you are fairly close to destroying the boom and the aft end of the boom will be almost touching the deck. This is because the vang has such a large forward component force that causes the lower section to bend. This makes tacking a whole lot harder as the boom is seriously low. Back in the good old days before longer boom sleeves and when weight jackets were not just legal but were almost the norm, getting under the boom was quite a challenge especially in bad sea conditions.

In Topic: Soft Deck Safety

17 September 2014 - 06:34 PM

The 2 most likely places the outer skin will now fail are at the intersection of the cockpit side tank and the deck and at on the gunnels at more or less the place where the non slip stops in the area you sit and hike out.These areas might need local repairs as time goes by........