systematic use of the inside ski in carved-c.ppt use of the inside ski... · systematic use of the...

SYSTEMATIC USE OF THE INSIDE SKI IN CARVED TURNS

Ron LeMasterMatej Supej University of Ljubljana

ICSS 2013

LeMaster & Supej, 2013

“Stand on the Outside Ski!”

LeMaster & Supej, 2013

Empirical Evidence

J. Kröll, ICSS 2013

Inside ski

Outside ski

LeMaster & Supej, 2013

LeMaster & Supej, 2013

0 20 40 60 80 1000

5

10

15

% Turn Cycle

Ski

Atta

ck A

ngle

[deg

]

Ski Attack Angles

R. Reid, personal communication, 2009

Outside ski, 10m course

Inside ski, 10m course

Outside ski, 13m course

Inside ski, 13m course

LeMaster & Supej, 2013

0 20 40 60 80 1000

5

10

15

% Turn Cycle

Ski

Atta

ck A

ngle

[deg

]

LeMaster & Supej, 2013

Why?

• Not simply a correction for tactical errors

• Enables

• Carving smaller radius turn

• Carving earlier in the turn

• “Arcing the whole turn”

LeMaster & Supej, 2013

Howe’s Basic Relation

LeMaster & Supej, 2013

LeMaster & Supej, 2013

LeMaster & Supej, 2013

LeMaster & Supej, 2013

LeMaster & Supej, 2013

LeMaster & Supej, 2013

LeMaster & Supej, 2013

LeMaster & Supej, 2013

LeMaster & Supej, 2013

Limitations

LeMaster & Supej, 2013

To Carve Tightest Turn

• Achieve highest possible edge angle on outside ski

• Put sufficient force on outside ski to make it cut the snow, hold, and bend

• Put the rest of the force on the inside ski

LeMaster & Supej, 2013

Conclusion

• Inside ski is used as vertical support, particularly in the first half of the turn

• Outside ski turns itself due to high edge angle enabled by support of inside ski

• Pressure on the outside ski comes from radial force, not gravity

LeMaster & Supej, 2013

Thanks for your attention!

LeMaster & Supej, 2013