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Thread: Sailing with negative volume
3rd January 2014, 10:10 PM #85
- Join Date
- Nov 2009
Amazing so many people seem to place a lot of meaning to the "volume" figure printed on the board. Firstly, it can be totally inaccurate and second, even if accurate the volume distribution can be very different board to board. I think many people associate volume with whether a board will float when off the plane. That presumably means the board is still moving albeit slowly........in which case it is the dynamic volume that is experienced not the static volume. The dynamic volume will appear higher than the static volume and the difference will be affected by the board width/plan shape/volume distribution/hull shape/rails etc. I have never seen any figure quoted for dynamic volume/float probably because it increases with speed through the water so is a variable. I figure for dynamic volume assuming a sub planning speed...say 4/5 knots would be interesting though.
When folks are out on very small kit, it is usually very windy, and that usually means even in lulls there is still enough wind to propel the board forward to some degree. I know 90k plus guys who use 80/85 litre boards and they are not up to their knees in a lull unless the wind dies completely such that they cannot make any forward progress. I am sure a number of brands understate even the static volume on some of their boards just to get them to fit expected categories ( 75/80/85/90/96 etc).........or maybe to flatter the rider!
3rd January 2014, 10:15 PM #86
- Join Date
- Nov 2009
ps............it now appears the most useful determination of obesity ( at least for a man) is waist size as a ratio of height rather than the BMI. More important than overall bodyweight however, is the percentage of fat in the body and most especially visceral fat. Even the thinnest person can be prone to diabetes etc if their visceral fat level is too high..........overall size is no guide in this case. You can get a measure of visceral fat and overall fat with bio scales or MRI scans but unfortunately the only totally accurate method is a post mortem!!
3rd January 2014, 10:24 PM #87
3rd January 2014, 10:42 PM #88
3rd January 2014, 11:40 PM #89K-151
Starboard Phantom 377L, Fanatic Hawk 135L, Witchcraft Chakra 105L, Fanatic Quad 84L
Tush Lightning 9.4, North S-Types 8.4 and 7.2, North Volts 6.4, 5.9 and 5.3, Goya Wave 4.4
4th January 2014, 01:05 AM #90
Windsurfing was only ever intended for small folk until that great Dunkerbeck interloper came and ruined everything.
Truth is no one teaches high wind gybing it's something you have to work out for yourself, the guru's concentrate on low to mid wind action, me I always likened it to slalom mono water ski-ing only with the added complication of having to transition the damn sail thing instead of just switching hands on a tow rope.
So, I spent every waking moment practising rig transitions til i could do it without thinking, then it all became automatic, up to a point.
Everything Max says, works, in fact everything everyone says, works for them, but us light weights don't drop off the plane as quick as big guys, so we perhaps might have a bit of an easier time of it, not that i want to admit to it..
4th January 2014, 09:52 AM #91
- Join Date
- Sep 2006
Something I don't necessarily agree on is that more wind typically also means enough wind also in lulls. Often really windy conditions also means pretty gusty conditions, and there can be periods when you have very little power in the sail. As you say though, unless you are standing totally still, the lift of the board will keep you from sinking fast even on a small volume board.
As a matter of fact, I often feel surprised how little the "feel of float" improves when I go for a bigger board. Normally I use a 75 liter also in pretty light winds, but at times I grab an 85 (narrow big wave model, sort of). Of course it feels a tad corkier, but you still have to stay relatively concentrated when slogging to avoid tail or nose sinking etc etc. Conversely, even on a 69 in winds far, far below planing, balance is not _that_ more demanding. I reckon there is a lot of psychology involved, if you _think_ your board is on the small side, it will affect you slogging confidence and confidence is very important in such situations.Ola H.
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