А вот что сами производители говорят про то, зачем они сделали/не сделали вырезы.
Взято отсюда:
http://www.boardseekermag.com/windsu...ntro-2011.html
Half the boards in this test have tail cut-outs – please justify why yours does or doesn’t.
Starboard: Theoretically speaking, cut-outs increase the efficiency of the wetted area by making the surface wider and shorter (i.e. higher aspect ratio). Experimentally speaking, we’ve plugged the cut-outs and taken the plugs off again a million times: the cut-outs do increase top speed and give extra sharpness to the acceleration. When they’re plugged in a board becomes more sticky and draggy. The acceleration just isn’t there anymore.
Mistral: In the Screamer line the small boards have no cut-outs as they’re designed to stay on the water in high winds. The bigger boards have them as they are designed to lift more board out of the water. The way I run the vee and rockerlines in the boards makes for a fast ride once you lift them slightly onto the rail. In effect the cut-out shortens the rail and there’s more lift in the rocker, resulting in less wetted surface and faster speeds. It’s the opposite when sailing flat, but the added waterline is what will give the control.
Naish: Our boards feature tail cut-outs to increase the top-end speed and handling in higher winds.
Thommen: Cut-outs or cut-aways are a way of diminishing or relieving some of the pressure of the board’s tail, so you get the leverage of a wide tail without getting overpowered by its surface when the pace picks up. They also help to promote a smoother and more comfortable ride – especially in rough conditions.
Fanatic: We more or less pioneered the concept with our Thundertail cut-outs more than 10 years ago. Since then we’ve stopped using them and tried to find different shapes to achieve more or less the same advantages, without the spin-out and drag associated with cut-outs. Right now we have a special vee concept in the tail that allows all the power to be released at max speed – the same as on our slalom boards. This means that in light winds we don’t have problems with spin-out or drag that cut-outs tend to have, but we’re still very competitive in upper end speeds.
Tabou: See previous answer about control.
RRD: You need to put cut-outs on a board if it’s not free and high enough on the water, but the Fire Storm shapes allow the board to be free and high and easily achieve top performance with a high level of comfort without them. We prefer to keep our board simple and stylish.
JP: We use cut-outs to stabilise the board, as fuller tails create a lot of lift and make the nose rise. Tail cut-outs take a bit of pressure from the tail and guarantee a smoother ride.