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Snapfigure said..
About the stubby and parallel rails (narrow boards) Some thoughts from a very experienced guy
When the outline is rounder, wider mid section and narrower tail. that is why I call it a compact shape, not a stubby.To get planing you have a wider midsection and when going fast you use the narrower tail. And the rounder outline turns better.Basically the square stubby is a mistake. When you have a flat rockered windsurf board (compared to surfing), you need outline taper. Outline taper gives a bigger wind range and turns better. It was just for marketing, they are always desperate for something new. You also see these brands going back to round outlines now. JP already went back the next year.
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Those are interesting comments - but I wouldn't quite agree.
If you just look at the plan shape of the board then, for sure, having a wide mid section means the minute you bank the board over the buried mid rail acts like a brake in the water and the board turns towards that side. But a board will also turn on its rocker line and with good sailor drive and with narrow boards you just need to commit with your weight more.
So we might say that boards that are wider in the middle will suit those intermediates just learning to gybe and starting to turn on waves, and a narrow tail may help for better control.
Where the parallel-sided hull shape comes into its own is in being narrower overall, which makes it faster, and the short length is better for tighter carved turns and for backfoot 'pivot' top turns.
The early planing is not about overall board width some much as a function of the hull width further back, under the straps - and that's why stubbies often have a relatively wide tail which is then pinched in for the very rear section. A wide tail can still be just as fast but will also support sailor weight in the lulls and transitions. You can usually keep good control as long as you don't sail the board over-finned.
Early planing is also a function of rocker line, and of course about having sufficient board volume for the weight of the sailor carried (float!).
Plus early planing is always about sailor technique and if there's a move back to traditional (longer and wider) shapes that's perhaps because intermediates find the step down to a narrow board that is just 215cms long a bit too much .
Most of us are more likely to enjoy a board that is easier to sail but the more active sailor can still reap rewards from a more radical stubby or compact shape. A lot of the new boards also need to be sailed off the front foot more and they won't work so well with sailors who still like to drive a board off the back foot.