# DOUBLE SHOT

Issue 319 - SEPTEMBER 2012

DOUBLE SHOT

Guy Cribb Intuition

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SEPTEMBER 2012

Double Words: Guy Cribb • photos: Guy Cribb and INtuition guests – Peter Corrigan in Maui and Lenka Slecna in Prasonisi

Shot Long before they bored me with logarithms I’d given up the will to live for maths, history and the sciences in school, and a subsequent series of fast exits from a number of establishments ensued. Funny that, considering Windsurfing INtuition has such a focus on the science of our sport.

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tance and tuning- so intricately linked- could be written with basic physics or geometry, and this is often how I back up my message to INtuition guests after the more humane Muscle Memory sessions. I am generally of the thought, drive a car well but let the mechanics look after the engine. However, if there was a button I could switch in a couple of seconds that offered dramatic performance enhancement, then of course I’d be keen to tune it- for example if I could switch between traction or turbo, I’d be using it in and out of every corner. This month’s Double Shot feature brings simple geometry to your boom height and outhaul settings and reveals how harmonious they are with each other. By flicking the Double Shot switch you’ll turbo boost your early planing or create more traction control, radically broadening the wind range of any of your sails. The feature is also a rough guide to outhaul and boom height tuning- but not the full story, we’re looking more at their relativity this month.

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Guy Cribb Intuition Outhaul Adjusting the outhaul alone can effectively increase or decrease your sail size by almost 15% – so if you have a 7m sail, you can basically turn it into a 5.9m or 8m. 7m sail -15% = 5.9m 7m sail +15% = 8m So if your quiver of sails were 9.5m, 7m, 5m, and 4.2m you would be very well equipped for every wind speed 10 – 50 knots - IF you were tuning them correctly, had the technique to back this up and did not have the specific needs of the wave sailor who demands more sails to handle the toughest conditions. Please refer to my recent Frigging in the Rigging feature about quivers/tuning (Windsurf/ guycribb.com).

Outhaul controls the power of your sail. Less outhaul makes the sail ‘fuller’ or ‘deeper’ giving you more power. So, less is more.

More outhaul flattens the sail giving you less power, so generally more control.

Boom height

We have flexibility in our boom height for two reasons. 1. The disparity in heights of the rider, and 2. To adjust early planing or control (two opposites in windsurfing.)

Boom height based on your height

I use a varying boom height range of about 12 cm between my 4 and 8m sails – • To increase early planing, raise the boom. • To improve control, lower the boom. 82

SEPTEMBER 2012

Raising the boom takes the weight off my feet and puts it onto the mast foot, which is right in the middle of the board naturally trimming it flatter. When the board is flat it accelerates easier/faster. Lowering the boom increases weight onto my front foot, naturally pushing the windward rail into the water, giving me more control. It also naturally lowers my body, and the lower I am the heavier I am- improving my counterbalance to an overpowered sail. This point alone could be a whole magazine feature, but please just take it for granted right now – lower boom equals more control. In flatter water we generally use a higher boom and in rougher water a lower boom. Side-onshore wavesailing a slightly lower boom, racing a higher boom, the list goes on but the general adjustment is higher for power, lower for control.

Double shot!

So the story so far is – • Raising your boom improves early planing. • Reducing outhaul improves early planing. • Lowering your boom improves control. • Increasing outhaul improves control. Imagine if you could adjust both boom height and outhaul together in a couple of seconds, having an instant Double Shot effect? Well, due to the basic geometry of the rig, when you raise your boom height, you are naturally reducing your outhaul tension, and when you lower your boom it naturally increases outhaul.

Maths and science The general max range of outhaul adjustment from min to max is 3cm, 2cm is usually enough. The general max range of boom height adjustment is 12cm, but 8cm is usually enough. For every 2cm (20mm, 1/2 inch) of boom height adjustment you have 5mm of natural outhaul change- the recommended incremental adjustment. So if you raised your boom by 40mm (4cm, 1 1/2 inches) that automatically adjusts your outhaul by a staggering 10mm (1cm) which is basically the equivalent of giving yourself an extra metre of power! So next time you think about changing a sail size, think again, think Double Shot!

‘In 12cm of boom height change there is 3cm of outhaul change

The double shot switch

There’s three main opportunities to adjust your boom height: 1. Whilst blasting along come out of the footstraps and stand near the mast, quickly adjust the boom height and get going again without even getting wet. 2. If you’ve fallen off, during a waterstart you are right next to the boom so a quick adjustment is easy. 3. Come into shallow water and quickly make the change.

Summary Early planing- the high boom naturally released outhaul – note how the sail is so full it’s touching the boom? That’s great in underpowered conditions.

Control- the low boom naturally increased the outhaul and the sail no longer touches the boom.

I love the soft Muscle Memory approach to coaching, but there is even science behind that. When it comes to tuning, it’s physics all the way- please check out the Cribb Sheet for a non-fussy scientific approach to tuning.

Guy Cribb INtuition - Riding the World By Storm

The Cribb Sheet says it all.

©Guy Cribb INtuition 2012 Guy runs INtuition windsurfing courses attracting guests from all over the world for a week of radical development and fun only at the world’s very best venues from Australia, Brazil and Hawaii to Greece, Morocco and the Red Sea. The courses are always fully booked and have non-stop repeat offenders working their way up from waterstarting and footstrapping to riding massive surf in Hawaii. Guy transforms your windsurfing by day and shows you round the very best restaurants and local secret spots by night to give you a 24/7 action-packed INtuition experience that is incomparable to other holidays or courses. Guy is Britain’s Professional Windsurfing Coach, former multi-times British Champion and National Racing Coach. www.guycribb.com

www.windsurf.co.uk

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