Think of the triangle created by the mast base, the connection of the boom to the mast and the clew of the sail. If the clew of the sail is dragging in the water then your options are:
1. Move your mast base back or
2. Move your foot-straps forward or
3. Lower your boom attachment or
4. Raise the position of your harness hook
5. Lengthen you harness lines

All the above have the effect of rotating the mast more upright in the vertical plane along the centre line of the board, which then increases the height of the clew in relation to the water. Work with one parameter at a time and make small adjustments and gauge the effect when fully powered up and locked in position on a slightly broad reach. You will find different optimum combinations of the above for each sail in different conditions (i.e. underpowered, comfortable or overpowered). Take note of what works and use when the next the conditions apply.

I've had that feeling before, it gives you no room to crank more power on. I agree with above, especially mast track back a bit. i think it is also a sign of maybe not having enough fin. I happily use a fairly gutsy 40cm fin on my 2014 isonic. What are you using?

John340 said...
Think of the triangle created by the mast base, the connection of the boom to the mast and the clew of the sail. If the clew of the sail is dragging in the water then your options are:
1. Move your mast base back or
2. Move your foot-straps forward or
3. Lower your boom attachment or
4. Raise the position of your harness hook
5. Lengthen you harness lines

All the above have the effect of rotating the mast more upright in the vertical plane along the centre line of the board, which then increases the height of the clew in relation to the water. Work with one parameter at a time and make small adjustments and gauge the effect when fully powered up and locked in position on a slightly broad reach. You will find different optimum combinations of the above for each sail in different conditions (i.e. underpowered, comfortable or overpowered). Take note of what works and use when the next the conditions apply.

+2
Lower boom is right too

Nah your all wrong .raising the boom lifts the clew when your hooked in and extend your lines.
If you don't ext lines yes it makes it worse.
I thought you guys know your stuff.
I sail severn

Im 190cm or 6ft3 always use top clew cleat unless really over powered

Just thinking outside the box, too much downhaul? Collapsing the top of your sail => no forward drive in the top half of the sail to pull the rig forwards....?

Try a bigger fin

I've found this too, all of the above is completely relevant to the situation, the two things that sort the situation for me I've found are a: don't sail underpowered, and b: try and hold a more upright stance (which ends up letting the rig stand more upright as well).

I have 2016 KAs when I first got them I found they would drag or hit the water so I soon learnt too rig them with extra extension so the down-haul pullies were not together as with older style sails which I use to always have touching this immediately fixed the problem and also leveled out the bottom of the sail with the bottom of the extension. Having said I rig my sails with a gap between pullies I find this is around luff spec's but I have been experimenting with the amount of down haul for lighter or stronger winds.

There is probably too much water causing it to hit your sail clew. Sail at low tide instead.

evlPanda said..
There is probably too much water causing it to hit your sail clew. Sail at low tide instead.

Yes. It's almost certainly due to dangerous climate change causing rising sea levels.

You can also see evidence of this at the start of every season by the way the board sits lower in the water.

I'm pretty sure that's it.

We'll all be rooned.

sboardcrazy said..

evlPanda said..
There is probably too much water causing it to hit your sail clew. Sail at low tide instead.

Bad luck if where you sail isn't tidal...

Sail closer to the beach where it is shallower and there is less water.