K = measured length of straight line between tip and tail

H = sidecut height (depth)

R = ((K*K)/(H*8) + (H/2))

How:

I took a long staight aluminium beam and used that for measuring when ski was updside down on the table redy for waxing.

Do have a wall:

Tie your ski stopper up. Place your ski on the floor, bottom down, and press it against a straight wall. Measure how many mm there is between skis edge and the wall and whats the distance between were your tip and tail touches the wall. Remember edges on bottom, not top of ski.

My new 161cm Head iSL RD r=11,5 measures:

K = 1,46m (146cm)

H = 0,022m (22mm)

R = ((1,46*1,46)/(0,022*8))+(0,022/2) = 12,12m

There is a slight difference of 0,62m. Something like 5% bigger r.

My sons 130cm Elan r=10m measures:

K = 1,16m

H = 0,019m

R = 8,86m

Here the difference is much more 1,14m. In % that is about 11% less.

My 180cm Olin powder and back country skiis measures:

K = 1,635m

H = 0,015m

R = 22,28m

Calculate your own ski radius or send me your measurements K and H and Ill do it for you free of charge. Post here some of your results and lets see how far off manufacturers figures are. Offcourse this is just a mathematical formula based on a true arch. A ski is allways cut unevenly to give it other properties as well.

H = sidecut height (depth)

R = ((K*K)/(H*8) + (H/2))

How:

I took a long staight aluminium beam and used that for measuring when ski was updside down on the table redy for waxing.

Do have a wall:

Tie your ski stopper up. Place your ski on the floor, bottom down, and press it against a straight wall. Measure how many mm there is between skis edge and the wall and whats the distance between were your tip and tail touches the wall. Remember edges on bottom, not top of ski.

My new 161cm Head iSL RD r=11,5 measures:

K = 1,46m (146cm)

H = 0,022m (22mm)

R = ((1,46*1,46)/(0,022*8))+(0,022/2) = 12,12m

There is a slight difference of 0,62m. Something like 5% bigger r.

My sons 130cm Elan r=10m measures:

K = 1,16m

H = 0,019m

R = 8,86m

Here the difference is much more 1,14m. In % that is about 11% less.

My 180cm Olin powder and back country skiis measures:

K = 1,635m

H = 0,015m

R = 22,28m

Calculate your own ski radius or send me your measurements K and H and Ill do it for you free of charge. Post here some of your results and lets see how far off manufacturers figures are. Offcourse this is just a mathematical formula based on a true arch. A ski is allways cut unevenly to give it other properties as well.