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vtmecheng

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Posts posted by vtmecheng

  1. This argument just keeps going, despite no new information for some time. This just wouldn’t happen in most any big sport. Those sports have press conferences and reporters who dig for the story. There would eventually be an official statement by the “league” and often the player would make a statement, either apologizing or doubling down. Only reason skiing can get away with silence is that it’s so small and the same level of money isn’t moving around. Any other sport and we would have statements.

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  2. Has anyone on a MOB actually found that raising the rear up has provided a meaningful benefit? I'm questioning if my current RTP shims, totaling 0.12", are even worth it. My front binding is about 1/4" higher with the shims on my RTP. (Edited heights after measuring)

  3. JB weld, the longer cure original version. Make absolutely sure it’s completely dry, even give it a few days with a fan on in a dryer part of the house. Use alcohol to clean the area, painters tape all edges so epoxy only goes where you want it. Don’t ski it for a couple days.

  4. Bringing back an old thread. I only ever added a thin spacer to my RTP, between the binding and aluminum mounting plate but not sure if it was enough to really make a difference. Looking at some of the pro skier binding setups I notice that some, like Will Asher, use a Reflex/HO style front release with a RTP that looks to have no cushion (just plate with non-skid for the RTP). This got me curious how high off of the ski is the foot with a Reflex/HO style release binding? How much difference between front and rear does the non-skid only RTP result in?

  5. Seems really dependent on the area. To northern VA, I’ve seen FedEx packages that are like new condition. Pittsburgh, FedEx delivers every package destroyed. They destroyed two new skis I ordered and will avoid them here at all costs. UPS seems to treat packages better here.

  6. @Broussard thank you for the information. I knew that the pylons have been different over the years, using screws for many of the years. Whatever the reason for the recent issues, it's good that they have added a screw to the top for 2023. I plan to apply some threadlocker to ours and tighten with rubber strap wrench. Hopefully that will be enough. We deal with enough danger in this sport to have yet another thing.

    One addition: Non-captive threaded fasteners in a vibration environment is always asking for problems. Any engineer who has been around the block a few times with this kind of design work has seen it. At my employer we have lessons learned training on this every few years just so the new engineers don't make the mistake.

  7. @skierjp it should never come loose. This comes off going across the wakes and it’s a really bad day. Also, that metal hits you in the mouth or eye and it’s a real bad day with stitches or more. As an engineer, there is no excuse for not including some method of thread retention. I’m going to add thread locker to ours but that is not really the right solution for high vibration applications like this.

  8. That pylon cap coming off highlights bad and dangerous engineering by Mastercraft at their own event. You can see the boat crew tightening it many times during competition. The cap constantly comes loose on other Prostars I’ve skied too and it has to be checked. The friction in one threaded fastener should never be all that is relied upon for safety, especially with vibrations and rotation against it. It wouldn’t have cost much to add a locking method here and there’s plenty of room for one. Thank goodness no one was hurt at the even when it came off but MC needs to update the design. I’m using this at work to teach young engineers why we have requirements that do not allow such a design.

  9. @03RLXi I thought about doing that. The pipe part of the top results in greater rotational moment of inertia, meaning it will want to keep rotating. I may start by flipping it over just to see how it works. No harm in trying and it will prove if it works better. I do like that it essentially has a protective cover around the tubing but that’s not essential.

  10. Quick update. Pulled a heavier shooter yesterday at 28 off and there was a bit more shake at the turns due to rope hits than I wanted. I’ll either need to shorten the tubing a bit or reduce weight off the top (driven mass) to improve that. The problem is that both changes will increase the natural frequency of the system, possibly bringing back some of the issues with camera stabilization induced jelloing. We will see.

  11. Yes, this mounts to a skidoc. The slot is for access to the inside to hold the wing nuts in place when tightening and let me add or remove tubes easier during the adjustment process. It’s possible that I could shorten the tubes up a bit and still get a good result but I’m not worrying about perfection unless I find this has too much motivation with shorter line lengths.

    I am sure a GoPro or dedicated camera without the phone stabilization would be a great answer but they aren’t $25. This also works for other skiers if they want to use their phone.

  12. It definitely helps but the springs look to be a little too soft and with too much available displacement. That is why the video shows so much shaking at each turn. What you want is just soft enough to dampen our high frequencies but stiff enough with lower deflection capabilities that the low frequency hit from a rope shock doesn’t cause large motion. It needs to be designed in a window.

    I just made this and it works fantastic with phones. The camera mount on top was replaced with a screw down type. The 1/4 inch vinyl tubing seems to provide just enough motion and damping. I played with different lengths and number of tubes. The height is easy to determine, this is a 2” pvc pipe cap on top. Four tubes seemed to work best on our 2021 Prostar. More was too stiff (I started with the 6 in the picture) and fewer caused too much shake at rope hits.7s9v6xj77m62.jpeg892at4wq77b5.jpeg

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