lundberg

@VONMAN I'm with you on the Denali journey; my skiing keeps getting better and I'm having so much fun! The C75 took me from 15off into 28off. I've been really tempted to try the C85 but now it looks like I might need to skip a model.

What is "Slalom Challenge Rd"? Sunday, 10. of March 2024 10:00 AM OW Tricks Preliminary Rd- Top 6 Advance to Finals start list 11:30 AM OM Tricks Preliminary Rd- Top 8 Advance to Finals start list 2:40 PM OW Jump Preliminary Rd- Top 6 Advance to Finals start list 4:24 PM OW Slalom Challenge Rd- 8 Skiers- 4 passes each 5:47 PM OM Slalom Challenge Rd- 10 Skiers - 4 passes each

@Horton I was able to use the "downloads" approach to increase the resolution of an image, thanks!

Thanks again to @pkulio! His data is great and is making me think about what sort of trends I can find. Here is a look at a comparison of angle, speed and location in the course at centerline (gate, 1 to 2, 2 to 3.....). If you pair this data with video you might be able to correlate small details with the impact on angle and speed, what the actual difference between an "easy" pass and a "hard" pass. Here is one of my 15off 34.2mph passes (at a minimum you can see that Paul runs and earlier line).

@Horton is there a way to improve the resolution of the images in a post? Looks great on my PC but once it get's up loaded to the tread you can't see any detail.

Big thank you to @pkulio for being the first to collect and send me data! He has a nice set up running standard phone video at the same time he was capturing gyro and gps data using a ski doc orbit mount. He was skiing 36mph running passes at 28 and 32 off. The "handle path" at the bouy gets less accurate as the rope gets shorter as it begins to arc as the skier gets higher and more free of the boat. It should still be accurate when the rope is tight behind the boat showing location in the course as well as cross course angle, directional speed and peak swing speed.

The Denali set screw for the fin block was on the 3.x skis (I had a 3.4). It went away once they had the "CG fin" which had a similar impact with the cross drilled holes. I liked the C65 and love the C75!

I was using a Rstyle and stopped because of foot pain. I went to a HRT and love it. Three other friends who were double boot users have also switched to HRTs and are happy.

@thager I took your advice this weekend. I've been a 15 off skier in the course a long time, just last year running my first 34.2 pass one time. This year, after loosing a little more weight and trying to understand the dynamics that need to happen between hook up and edge change, I've been improving each time I get a chance to ski in the course. I started taking shots at 22off with some success running it at 32.3 and 5.5 at 34.2 a month ago. This weekend I got 6 sets at StellaBlue and gave myself permission to go have fun and try 28off, even right from the dock. It was so fun and different. I could feel the dynamics better and realize the things I was "getting away with" at longer lines. The punchline is that I ran multiple 28offs at 32.3 and rounded 4 ball at 34.2! I'm pumped and bummed the season is coming to an end for me here in Washington.

@adamhcaldwell thanks for the encouragement! I reached out to Cord and could not make this weekend happen, but I'll try again.

@ski6jones @Kroeks has it right, the plots show the course starting at the bottom and running to the top. As you round the ball you slow down as the swing goes away from the boat and you are just starting to accelerate. The pink mark shows where the peak swing speed happens and the green where max speed over the water happens. In the last plot you can see that my peak swing speed is just before centerline and the peak speed happens sometime later as your direction becomes more in line with the boat. You can see how I'm getting later and later by how close the max speed is to the ball. You can also see how I pulled long to 6 and my peak swing speed was after centerline.

@TFIN @Chris Rossi I just finished listening to the latest spray makers podcast on gates, and loved the talk about "handle path". I wonder if you'd be up for collecting some data to see how it aligns with your thinking?

This is an update for my effort to understand what is going on while I ski. It started in the winter with a parameterized matlab model of the handle path based on a swing profile. part 1- https://ballofspray.com/forums/topic/51107-slalom-ski-path-physics-matlab-model/#comment-846939 followed by a simple setup to measure the actual swing profile with rope tracking camera mount and phone app to record the gyroscope data part 2- https://ballofspray.com/forums/topic/51660-slalom-ski-handle-path-physics-part-2/#comment-850767 A couple of weeks ago I took a trip to StellaBlue and had a chance to collect some data in the course and have a great time skiing! (Side note - I improve my PB almost a full pass, running 15off/34.2 (7 times), getting around 4 ball at 22off/34.2mph and around 3 ball @ 28off/32.3mph) Here are a couple of fun pictures from the trip (you should go to StellaBlue if get a chance) So here is the data. There is lots of info here, but I think it would be most useful for those who are trying to make a change and see / measure the impact. Whether it is location in the course for gates, speed dynamics (think "fast vs slow" ski), differences between onside and offside, or "what is another skier actually doing differently than I am"....its all here. If you collect some as I described in part 2 I'd be happy to "process" it for you. (The plots are not to scale (x vs y). I'll put one at the end for reference.) @MarcusBrown @AdamCord

I captured another data set this morning. Lot's of info can be mined from this data. zoomed in and to scale