What is the difference between Mk1 and Mk2 Laser sails

So you're looking at upgrading or swapping out your rig, huh? The whole Mk1 vs Mk2 Laser sail thing—it matters more than you'd think, both for how fast you go and whether you're even legal to race. The big stuff comes down to shape, how it's built, the battens, and what mast you can slap it on. The Mk2 came along to replace the old Mk1. It's got this more modern, aggressive profile that's supposedly quicker in all sorts of conditions. But here's the catch—you need the right hardware to make it work.

How can I tell if my Laser sail is Mk1 or Mk2?

Honestly, the simplest way? Look at the battens and the very top of the sail. The Mk1 has this one long horizontal batten up near the head, and then a shorter one just underneath. The Mk2's totally different—two full-length horizontal battens, one near the top and another further down, plus this vertical batten running up the back edge, the leech. Oh, and the Mk2's got a beefed-up head patch and the clew—that bottom back corner—is a different design, hooks into a special outhaul system.

Are Mk1 and Mk2 Laser sails interchangeable?

Could you physically bolt either sail onto a Laser mast and boom? Yeah, probably. But are they truly interchangeable without messing with your rig? No way. The Mk2 sail absolutely needs a Mk2 mast and a Mk2 boom. That mast is stiffer, has a different bend profile, all to actually power the Mk2 properly. Stick a Mk2 sail on a Mk1 mast and you'll get a terrible shape and feel slow. Sure, you can use a Mk1 sail on a Mk2 mast, but it just won't be as good as the real deal Mk2.

Which Laser sail is faster: Mk1 or Mk2?

Pretty much everyone agrees the Mk2 is faster, especially when the wind's light to moderate—say, up to about 15 knots. It's got this fuller, more powerful shape that just drives better and points higher. Those two full-length battens and the vertical one? They make the leech way more stable, less flappy, so you can trim more precisely. In heavier air, both need depowering, but the Mk2 generally gives you better control. That said, the Mk1's still competitive. Some folks actually prefer it—it's simpler, more forgiving when it's really blowing hard.

What are the key technical differences between Mk1 and Mk2 Laser sails?

The technical stuff? It's pretty big. Changes how the sail and mast work together in the wind. Here's a table that breaks it all down.

What is a Laser sail Mk2 upgrade?

Thinking about ditching the Mk1 for a Mk2? You gotta make sure you've got all the bits. Here's what you'll need.

• Mk2 Sail: The big one. Comes with the new batten and clew setup.
• Mk2 Mast: Stiffer, different taper. Seriously, don't cheap out and use your old Mk1 mast.
• Mk2 Boom: Has that specific outhaul fitting for the Mk2's clew.
• Battens: You'll need three—two horizontals and one vertical. Make sure they're the right lengths.
• Outhaul Line: The Mk2 system uses a 2:1 purchase. So yeah, new line, maybe a cleat too.

Frequently Asked Questions