Board design #3: Length, flex and turn radius // A correction!

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Video description / background:
It contains a mistake that was brought to my attention by a viewer, and I had to correct it for peace of mind and to simply stick to facts.
It is interesting and shows again that snowboarding at its core is all physics and pretty darn nerdy... Watch this clip to understand the connection between length, flex and turn radius!

[shycarves]

Honey Lars posted a video. Winter is coming.

[bestrongphysio]

Brilliant Lars! Saying you were wrong and correcting yourself is NOT easy to do and most people wouldn’t do it!

[riotsupercarver]

Well done. Loved the cardboard board visual aid.

[ShredAheadSnowboarding]

This video brings to mind the flex pattern of your Standa Cheater which allow the bending process to aid the side cut for those shorter tight turns. Additionally many riders don't consider overall flex patterns, I personally like a softer flex though the middle of the board to help me with pressure throughout the turn with a solid camber profile. Great Video thanks!

[digitalysed]

Great to see you Lars!
Looking forward to another Justaride winter! 🥳

[finboyYYC]

glad to see the videos coming back Lars, great info

[andrewduvenhage]

Great video! Now we need a video about flex.

[martinbailly]

Excellent correction ! Perfect presentation. Keep it up Lars ! 👍

[sugarplumflyjelly]

Without math equations, I made a similar argument as riotsupercarver in the comments on your previous episode.

"The increase of sidecut depth that results from increasing effective edge, given constant sidecut radius, is the result that effective edge tracing a larger length of circle, and thus more of that circle's curvature, but it does not change the circle itself (or, therefore, the sidecut radius, or the range of possible resultant turn radii)."

Distinguishing between flex curve and sidecut curve is indeed useful. And, depending on flex, flex curve may or may not yield a tighter radius turn given different lengths and the same sidecut radius. But, *thank you* for making your excellent videos, for carefully correcting, and for helping us all think through the complexities of carving snowboard design.

[darkieca]

Soo good to ear you again :) Zat makes me smile :D
Perfect video as usual !
Winter is coming \m/

[vassilismavromatis]

Key takeaways here: Most important, it seems your videos are based on your own knowledge and observations rather than repeating what is "commonly known" out there, hence there is always the chance for an error - to me that's a plus. Very brave, clear, thorough explanation and admission of your mistake, you did not try to hide or make a very short "hopefully easy to forget video about it". Kudos to you! Also, great to see contribution from the community / your followers, well done @riotsupercarver (hope I got the name right!)

[ferryman]

Woohoo, he's back..thanks for clearing that up..had me confused🤔👍

[ethanchamberlain]

Good insight. I started riding a significantly longer board last season w/ a med stiff flex and was liking it better that shorter stiff boards w/ deep side cut that I've been on last four years.

[lucasrocha]

nice video!! I'm 5'3' (160cm) 85kg (187lb) and bought Burton Custom Camber 154cm.. stability is so amazing.

[CLGill]

Great to see you back at it Lars. Just received my custom Donek board (160cm length, 30cm width) with a "variable" 7-10cm sidecut. I think you may have helped my understand how a sidecut can be variable depending on pressure of the press during a turn. Either way, great vid.

[Typhoonis]

This is a good reason to have a look at the size charts when buying a new board! Just because the 146cm was the only one left on sale if you are 85kg its not going to have that stiff flex its advertising you will overpower the board and it goes the opposite as well if your 45kg trying to flex a 165cm mid flex board your going to have a workout on your hands and not a great experience

[debarros]

You are the goat man! I'm 5'11 with roughly 230 pounds, and I might be around 250 with boots and a suit! size 11.5 boots bought a board of 165 wide, and I am not sure if will be too big for me. but I like stability and confidence on the board. shorter boards I rode were too nimble and all but freaking unstable and came out of the carve very loose. since I'm a very heavy guy with a strong riding personality!

[schtefel]

I guess this is why at my current level I actually prefer a less stiff carving board. It allows me to make a tighter turn at lower speeds. As my skill level will increase and thus my riding speed, I will be more keen to switch to a stiffer board when I am able to push against the board harder and therefore flex it more for a tighter turn shape. And obviously the higher the speed, the more stable a stiff board.
Same journey as with skis where I really like the stability of a stiffer ski while going fast but still able to carve tight turns.

[ShredAheadSnowboarding]

I have also taken other riders boards and lay them on a table so they can see their effective edge and side cut offset to better understand where to allow ie use edging and pressure during a turn, basically what kind of board performance they are looking at overall.

[daytch]

In turn( pun intended) the side cut also enables the turn flex because without it the tip and the tail wouldn't be able to contact the snow when turn flex would be initiated