Harness Straps

> 10 years ago
Reply
Register to post, see what you've read, and subscribe to topics.
Daneli
Daneli
QLD
1538 posts
QLD, 1538 posts
10 Mar 2008 10:30am
Does anyone move their harness straps back and forth along the boom depending upon the wind conditions?

I was sailing yesterday in stronger winds and found that every time I went to move back on the board towards the footstraps, the board wanted to round up into the wind. The harness straps were still set to the last time I sailed in 15 knts as opposed to the 20-25knts at Vic Point yesterday. Obviously as I moved back, the sail moved back resulting in the round up. If I wanted to head square or even slightly downwind I had to move my front foot forward to almost the maststep. Then I had trouble controlling the board.

Would moving the straps back on the boom help in stronger winds
NSW, 74 posts
10 Mar 2008 11:46am
if your overpowered and cant sheet in, move the back one an inch or 2 back, if it on the same size sail..
JayBee
JayBee
NSW
714 posts
NSW, 714 posts
10 Mar 2008 11:53am
You need to have more of your weight in the harness and less on your feet. More mastfoot pressure will stop the board from rounding up.
You only move your harness lines in response to a changed sail setting (i.e. if you have rigged you sail the same, then there is no need to change your lines (unless you do not have enough downhaul, in which case your centre of effort may move a lot whne the wind strength changes))

Take a look at www.guycribb.com under technique, it is a good place to start.

JB
555
555
892 posts
555 555
892 posts
10 Mar 2008 1:55pm
so.. it's blowing pretty hard, you're hooked in, but not yet in the straps? Sounds like a recipe for a catapult and some broken stuff - rounding up into the wind is probably a good thing!

Have a go at getting your front foot into it's strap before you hook in - the two (front footstrap/hooking in) are really interchangeable in sequence (personal preference). But, if you can get your front foot securely in it's strap first you'll seriously decrease your catapulting chances, will feel more in control, and will also gain a direct connection to the board which will help you steer.

You don't need to be hooked in to get in the straps, and not being hooked in to start with will help improve your sail power control skills.

Jem Hall talks about two phases to getting planing in his 'Beginner to Winner' DVD..

First he suggests that you imagine you are attempting to sit on a barstool beside your board, this puts your upper body and legs in the right general stance (if you have a barstool handy, you could try putting your board beside it to see what he means). Next, he talks about 'the accellerator' which means getting your front foot into the strap nice and securely, then pushing it forward (straightening your leg to drive the sail's pull though into the board), and pointing your toes just like you would if you wanted to accellerate hard in a car.

This has two immediate effects, the first is to apply pressure to the downwind rail which will turn the board off the wind a bit more and flatten it out if you've been a bit heavy on the upwind rail, and the second is that by pushing your foot/leg forward, you will unweight your back foot and commit yourself more to the boom. This will help you to get planing in a nice flat trim, and allows you to easily stick your back foot into it's strap all in one smooth movement.

Once that's all done, you can choose to hook in whenever you like.

Harness lines generally have one position for a given sail, and if the sail is rigged consistently, they shouldn't move. Try rigging your sail, and then measuring 1/3rd back from the front of the mast to the clew. Your front harness line should be about here, and the back one maybe a fist back from there. This is a generalised measurement, but should get you in the ballpark.

When planing and hooked in I aim to have the harness lines in a spot that allows me to take both hands off the boom briefly, with maybe just a touch more weight required on my front hand compared to the back hand (this just ensures that you're naturally sheeting in enough without having to think about it). Peter Hart says that you should be able to 'play the piano' on the boom, so there's really no pressure in your hands.

Another thing you can try is dynamic steering.. in light winds and when learning, most people steer by tipping the sail forward and backward. Dynamic steering is about getting physical with the whole rig. Get your legs and feet in on the action and really shove the board around rather than letting it turn in it's own time. This builds up your board control, and will help get the unintended rounding up sorted too.

Also consider your mast foot position - I've never sailed one of the newer longboards, so can't advise on where to put it, but having the mast foot too far forward could contribute to rounding up (the sail is more raked back when you step back on the board)
nobody
nobody
NSW
437 posts
NSW, 437 posts
10 Mar 2008 5:17pm
Daneli said...

Does anyone move their harness straps back and forth along the boom depending upon the wind conditions? No, but I have a 2 cambered sail.

I was sailing yesterday in stronger winds and found that every time I went to move back on the board towards the footstraps, the board wanted to round up into the wind. You need you rig angled further forward, sheet on more to bring the nose back toward down-wind with plenty of front foot pressure and to really get going before you try to get into the harness and then straps.

The harness straps were still set to the last time I sailed in 15 knts as opposed to the 20-25knts at Vic Point yesterday. Obviously as I moved back, the sail moved back resulting in the round up. If I wanted to head square or even slightly downwind I had to move my front foot forward to almost the maststep. Then I had trouble controlling the board. Are you fully planing before you go for the straps? It doesn't sound like it. If your not the board would be stalling then pivoting upwind.

Would moving the straps back on the boom help in stronger winds
No. The strap position as said by 555 should balance the sail with no hands. If you sail is not cambered and 7.5m+, the centre of effort might move a bit.


Also on the Kona One the front mast track position is better for an easier progression to planing but slower on the plane.
Moving it to the rear the opposite happens. It also gives less control in extemely fast reaches as you will start to get "tail wagging" sooner. I keep mine in the middle most of the time as I couldn't be bothered playing with it.


DBF
DBF
WA
14 posts
DBF DBF
WA, 14 posts
10 Mar 2008 5:55pm
Hi All, being an old dog learning new tricks, what length should my harness straps be, is there a golden rule? cheers
NotWal
NotWal
QLD
7436 posts
QLD, 7436 posts
10 Mar 2008 7:41pm
Guy Cribb Makes a good argument for long lines.
www.guycribb.com/

As a rough guide they shouldn't be any shorter than 26" and could be as long as 30".
I'm 170 tall, have my booms centre about 120mm from the top of the cutout (just at chin height) and my lines are about 28" - seems right. Oh that's with a waist harness. If they are too long (say 30" for me) it becomes difficult to maintain mast foot pressure and the harness becomes uncomfortable.
Gestalt
Gestalt
QLD
14968 posts
QLD, 14968 posts
10 Mar 2008 7:58pm
Hi Daneli,

did you have the centreboard fully retracted?

if not that could be the problem.
Daneli
Daneli
QLD
1538 posts
QLD, 1538 posts
10 Mar 2008 9:03pm
Thanks for all your feedback.

Gestalt - Yes the centreboard was fully up. PS did you see the great photos gregwed took. There's a great one of your inner left thigh.

nobody - the board is not stalling. I'm pretty sure I'm planning, it just doesn't want to go downwind. Mast track was in a centre position.

555 - Yes I had a few spectacular catapults. Unfortuanely because I have my front foot so far forward it is nowhere near the footstraps to hook in.

Jaybee - I'm not sure what you mean about mastfoot pressure. Is this pressng down on my front foot. Won't this want to turn the board further into the wind.

Maybe I am being lazy and hooking in too early or expecting too much from my limited experience.

Thanks again. I'll keep persevering as I'm still having alot of fun

MintoxGT
MintoxGT
WA
975 posts
WA, 975 posts
10 Mar 2008 8:10pm
555

Nice write up mate, I got a bit out of that.

Cheers GT
mineral1
mineral1
WA
4564 posts
WA, 4564 posts
10 Mar 2008 9:02pm
Daneli said...

Thanks for all your feedback.


Jaybee - I'm not sure what you mean about mastfoot pressure. Is this pressng down on my front foot. Won't this want to turn the board further into the wind.

Maybe I am being lazy and hooking in too early or expecting too much from my limited experience.

Thanks again. I'll keep persevering as I'm still having alot of fun




Means weight on harness or boom placing pressure down on mast foot to get drive.
And try not to get lazy and hook in first, go the guy cribb method, hang off boom, get some speed up, front foot in and then maybe harness line. Don't be shy about heading off down wind to get this part. And 555 has it right in what he has described. Good luck
555
555
892 posts
555 555
892 posts
10 Mar 2008 9:18pm
Windsurfing is all about balance.. in all three dimensions simultaneously!

Mastfoot pressure is one of the true keys to windsurfing. This is generated in a few ways, and is a dynamic sort of thing that can be a little tricky to get a handle on until you're doing it!

Basically, it can be thought of as any force pushing through the mastfoot into the board. In this particular case (getting planing, and into the straps) the required force is mainly downwards, and so will be pushing the board onto the water - 'downforce' if you like.

Two things will cause your board to turn into the wind, firstly, if the centre of effort in the sail is behind the centre of lateral resistance of the board, then you will experience a kind of weathervane effect. Secondly, and this is only really relevant if you're planing, if you have unbalanced weight on the windward rail (so that the board is tilted to windward) the board will carve into the wind.

Think of the centre of lateral resistance as a point on the board where if you were suddenly hit from the side (perhaps by a hairy chested, gold chain wearing chap on a jetski..) you would just be shunted sideways rather than being turned in either direction (ignoring for the moment the effect of the sail, and the distribution of mass on said shunting, and focusing on the hydrodynamic forces).

This point moves forward and back depending on how fast the water is flowing over your fin, whether you have the board flat or tilted, and the shape of the part of the board that is in the water at the time. As your speed increases to planing, this point moves back so that it is in the vicinity of the footstraps, and is mainly concentrated around the fin.

The centre of effort of the sail is close to being a fixed point on the sail these days with decent sails, and you move it - and alter the balance of things - by raking the sail forward and backward.

So, as you accelerate towards planing, you need to alter the rake of the sail to keep those two forces in balance.

How to generate mastfoot pressure or 'downforce'? Sheeting in generates a bunch, commiting your weight to the boom generates the rest. Where on the board it acts is determined by your mast foot position.

You should aim to be carried as much as possible by the sail, and be quite light on your feet. When getting planing it is sometimes helpful to think of pushing the board forward and down using the boom.

Given sufficient 'downforce', and the right balance of those scientific sounding 'centres' it is possible to move back down the board as you accellerate. As you get your front foot into the strap, you can counter the potential for carving by using the 'accellerator' technique.

The fin will also counter the upwind carving by generating a rolling moment on the board which would effectively carve the board downwind if it wasn't balanced by you standing on the windward side. (Best demonstrated by using an oversized fin, a narrow board and a small sail in big wind!)

So, to sum up all of that ramble..
0) Make sure your gear is set up right - not enough downhaul will stuff you up no end!
1) Keep the board flat.
2) Rake the rig appropriately to balance the 'turning' effects of the change in speed
3) Sheet in, and commit your weight to the boom to generate downforce
4) Go for the front strap, and then use your foot to steer
5) Hang your weight on the boom, and your front foot while you quickly sneak into the back strap
6) Own it!

You can hook in anywhere along the way from 1-6, but my suggestion is that you do it after 4).

There are a number of good videos and DVDs out there that will help.. I've taken a bit from every one I've watched. A picture is worth a thousand words, and a video even more.
bc
bc
QLD
708 posts
bc bc
QLD, 708 posts
10 Mar 2008 10:23pm
what you are going through is a common problem (I come accross this a lot with my students). There are a few causes.

Sometimes people tend to sail with their feet to far apart and as they step back they transfer their weight to their back foot which causes you to round up.

try to head down wind a bit make sure your front foot is pointing forward , take small steps back and keep the board as flat as possible. After a while it will become second nature

hope it helps

decrepit
decrepit
WA
12885 posts
WA, 12885 posts
10 Mar 2008 9:43pm
[edit] looks like I took too long to compose this, I've been beaten to it. Never mind I'll leave it here anyway.

Daneli, looks like you fooled everybody (except Gestalt) by not mentioning you have a centerboard.

Anyway the dynamics of going down wind are similar for long and short boards, but the effect of the rails are more pronounced on longer boards.
So what needs to happen when you go downwind, is for the center of lateral resistance (rails + centerboard + fin) to more or less match the position of the center of lateral effort (sail effort transmited via mastbase and your feet..
If the board wont go downwind, that means the center of lateral resistance is staying too far forward as you move back.
I'd try moving the mastbase all the way back in the track, that should mean you can move further back without raking the sail so far back, and more rail can come out of the water, moving the center of lateral resistance back. As you pick up speed, more and more rail will come out of the water, meaning you can move the sail back further, and commit more weight to the harness and go still faster.

If the harness lines are too far forward, you'll be pulling more with your back hand, this force is transmitted through your back leg, pushing the board upwind. Set your harness lines so you have = pressure on both hands.
Gestalt
Gestalt
QLD
14968 posts
QLD, 14968 posts
11 Mar 2008 12:32am
agree with decrepit here.

but thought i'd add a few more things.

on a long board sheeting in and raking the sail back will have you sailing upwind faster than you can say don;t sheet in.

the technique with longboards is to do a flare gybe of sorts to get the thing going downwind. then hook in.

to so this you need to push the rig forward and tilt the mast slightly to windward while hanging from the boom. (i can show you at the beach) this technique is even more important in stronger winds as longboards have a tendency to round up.

it will also help to move your hands a little further down the boom towards the clew.

then once you are sailing downwind in a normal sailing stance, move back slightly and hook in. don't oversheeting or rake the rig back as this will send you back upwind.

another trick is to push down on the windward rail when getting the board to turn downwind. longboards at subplanning speed are opposite to shortboards. so leeward rail to go upwind and windward rail to go downwind.

once you get to the point where you are sailing along with centreboard up, planing and hooked in the kona will act like a shortboard and respond to carving like a shortboard does.

the tequnique for getting the board to bear away rapidly is the first part of the Flare gybe.

once you get your flare gybes sorted you will be able to sail along at full speed, throw the rig forward and jump on the rail and have the board spin around in an instance.

lots of fun.

cheers
gestalt.
Gestalt
Gestalt
QLD
14968 posts
QLD, 14968 posts
11 Mar 2008 12:42am
hey Daneli,

i also wanted to add you are making excellent progress mate. to be able to sail that kona in 20-25 knots after only 2 months is fantastic.

i reckon it's time to learn the flare gybe. the rig skills you get from that will really help you sort out the board control.

i still steer my formula board with the rig by altering it's postion. once you get the knack of it you can twist forward and have the board bear way without even using foot pressure.
Daneli
Daneli
QLD
1538 posts
QLD, 1538 posts
11 Mar 2008 9:33am
Thanks Gestalt, I am thinking of getting a second board for conditions over 15 knts. The Kona is taking a flogging in the 20knts+ conditions like Sunday. Particlarly from the harness scratching it from climbing back on all the time. (I probably need to learn how to waterstart)

I actually cracked the hull from the boom hitting it in a big catapult. It's only a small hairline split but there were small bubbles of air and water coming from it at the end of the session. How to fix this might be the subject of another thread!

DBF
DBF
WA
14 posts
DBF DBF
WA, 14 posts
11 Mar 2008 9:38am
NotWal said...

Guy Cribb Makes a good argument for long lines.
www.guycribb.com/

As a rough guide they shouldn't be any shorter than 26" and could be as long as 30".
I'm 170 tall, have my booms centre about 120mm from the top of the cutout (just at chin height) and my lines are about 28" - seems right. Oh that's with a waist harness. If they are too long (say 30" for me) it becomes difficult to maintain mast foot pressure and the harness becomes uncomfortable.



cheers for the info, must make a couple of adjments and try again
timford
timford
NSW
510 posts
NSW, 510 posts
18 Mar 2008 7:27pm
what a great topic, thanks for asking the question and thanks to all for replying, i have a starboard go (profile pic from recent maui holiday) and I am have heaps of trouble holding a reaching course when approaching planning speed and hence rarely get there. Someone said to me to roll my weight more to the side of the board rather than the rear of the board, however in doing this all i seem to do is slow down and not achieve anything. Any further tips?
pepe47
pepe47
WA
1382 posts
WA, 1382 posts
18 Mar 2008 7:35pm
Great tips, thanks 555 and all the rest, may help me remedy my forearm fatigue. Marking out mast foot positions on the board for different sails right now. Also positions on the boom. Been suggested I should also go underhand grip on port tack. Starboard tacks ok but when I become fatigued I go for overhand....don't figure.

Must have taken a while to compose, so, well done!!
Always appreciate advice from those who are willing to impart thier skills on those who desperately need it.

Still buzzing from Yesterday
easty
easty
TAS
2213 posts
TAS, 2213 posts
18 Mar 2008 10:47pm
timford said...

what a great topic, thanks for asking the question and thanks to all for replying, i have a starboard go (profile pic from recent maui holiday) and I am have heaps of trouble holding a reaching course when approaching planning speed and hence rarely get there. Someone said to me to roll my weight more to the side of the board rather than the rear of the board, however in doing this all i seem to do is slow down and not achieve anything. Any further tips?


Weight to rear creates drag - you wont plane.
Weight to side makes board round up into wind - you wont plane.
Weight needs to disappear - weight on harness, weight off feet - planing.
It's really something that happens with practice - no-one can give concrete advice as every situation varies with wind strength, sail size, board type, your size, etc. Just get out there and have fun and it'll all come together eventually.

easty
easty
TAS
2213 posts
TAS, 2213 posts
18 Mar 2008 10:50pm
Oh yeah, if you're reaching on a beam reach, you might need to bear off a bit to a broard reach to get your gear planing.
decrepit
decrepit
WA
12885 posts
WA, 12885 posts
18 Mar 2008 8:52pm
And pump, did anyone mention pump?
Cruiser1755
Cruiser1755
QLD
235 posts
QLD, 235 posts
18 Mar 2008 10:16pm
sometimes a few little pumps seem right and other times a big pump is the go but I can't figure why, I just know both work for me at different times...why?
easty
easty
TAS
2213 posts
TAS, 2213 posts
18 Mar 2008 11:30pm
decrepit said...

And pump, did anyone mention pump?


Maybe pumping is something to try once the art of planing is second nature.
To be honest (and off topic) I only really got the hang of it last week - don't know what I'd been doing wrong previously, and don't know what I did differently last week in marginal planing conditions, but seriously the feeling of bending the knees and forcing the wind across the sail, driving the force down the legs into the board, and the climax of hooking in on the last pump and feeling the board drive away planing and gently shifting the feet into the straps was, well, did I mention climax before?
It reminded me of the first time I got into the harness and straps - a real breakthrough.
And it came about purely through practice - I'd pumped and pumped before, no result, eventually it all comes together.
Gawd, Finbar Saunders (and his double entendors would have a field day with this post )

timford
timford
NSW
510 posts
NSW, 510 posts
18 Mar 2008 11:54pm
damm I am hanging out for that result!! many thanks
oldie
oldie
VIC
356 posts
VIC, 356 posts
20 Mar 2008 12:01am
How to get your GO going, Timford-
It will take much less TOW than I did with my Go if youfollow these pointers-

* Don't drag along with nose in the air like your mates might be doing on narrower boards. Forget about straps at first (booties are good) but get your weight into the harness straight away with long lines and low boom. Correct balanced line position on the boom, starting with them forward to reduce power is catapult city.
* Sails less than 6.5 don't work very well, you can spill power by feathering the sail with your front arm. This pulls you more upright on the board to compensate for the power reduction. But my breakthrough was understanding that OVERsheeting reduces power too. As a gust pulls you onto your toes you can step towards the downwind rail with your back foot which turns you downwind, oversheeting the sail and saving theday.
* Concentrate on getting the board running flat while keeping a constant sail pressure and a constant light weight on the front foot. The Go planes very progressively and won't really speed up until you start working your way back, sheeting in to adjust to the relative wind and raking the sail back. What fun to be had...
timford
timford
NSW
510 posts
NSW, 510 posts
25 Mar 2008 3:52pm
Thanks for those tips. I got my Go 'going' on Friday night with the 6.4 and wind the high teens. Had a blast.
I only managed to get my front foot in the strap and its felt pretty good other than fighting a little to stay down. I did find keeping the board flat and being out of the strap till really going was the best way. I do tend to hook in as soon as possible when up and I found Jen Hall's harness line placement video on youtube very very useful.

I had a quick run on my wife's JP 110 Xcite ride after and goodness me that flies! A little hard for me to water start so i will stick with the 180 Go for a lot longer.
Please Register, or first...
Topics Subscribe Reply