It looks like you are using an ad blocker. That's okay. Who doesn't? But without advertising revenue, we can't keep making this site awesome. Click the link below for instructions on disabling adblock.
Welcome to the Newschoolers forums! You may read the forums as a guest, however you must be a registered member to post.
Register to become a member today!
so me and my bud .lencon were going for max speed today, and we got this result. we got first chair on the canyon and got some niceeee groomers. so we decided to go full throttle. we started the app on the last part of riding the lift. we get off the lift, traverse over to the canyon, and then send it. so heres the results..
we were absolutely mobbing. this was the fastest ive ever gone and was scared for my life. .lencon was on his 4frnt yle and i was on my KF rayzrblaydz. so theres this canyon at pebble and we straight lined it to the bottom. did we really go this fast? how accurate is ski tracks app? anybody have any experiences with the app?
devan1044I do a decent amount of GPS work for school (with the cheap GPS receivers that are found in phones), and they are very accurate in determining velocity when height is unchanging. This is because they compute speed based the rate of lat, lon, alt change. GPS works by having multiple satellites (minimum of 3, optimum of 4 satellites) broadcast at the time over and over again. Since the satellites are at different distances away and the signal takes a constant time to travel, your reciever can triangulate your location based on small time differences between each signal. With a 3 satellite gps triangulation, lat and lon are very accurate but altitude can have large uncertainty. I would guess that the mtns blocked some signal and only gave your receiver 3 signals to work with. With 3 signals, there could be a big swing in the Z location and your total distance traveled could be huge error in altitude. Looking at the graph, your most rapid descent was 900ft(.17mi) in about .1 miles. This would compute to a slope of about 60 degrees ( tan-1(.17/.1). I don't know of any in bounds 60deg slopes or any 60deg slope I wouldn't shit myself skiing let alone straight lining, so I think your gps altitude is off and that error is propagating to an insanely high speed.
I'm not saying you weren't sending it, but 90+ seems excessively high. Just my theory though.
definitely legit answer.
as well, you probably had park clothing (not skintight) and park skis on.
tons of air resistance and probably pretty high coefficient of kinetic friction compared to race skis
dickhead.why is your battery level so high after having your phone in your pocket all day? you must have charged it on the way home or when you got home, and the 96 mph was in your car on the way home
AUSTINBIKESKIdefinitely legit answer.
as well, you probably had park clothing (not skintight) and park skis on.
tons of air resistance and probably pretty high coefficient of kinetic friction compared to race skis
If you read the thread it says what skis were used
I can confirm that GPS is least accurate at measuring ellipsoidal height when compared to lateral translations. In short it is a form of parallax error which subsequently will produce inaccurate speeds inferred from the data.
That said, lets say you did achieve 96.6mph... still isnt 100
but what if i told you guys i was wearing only a speedo and goggles.... it was gaper day.. that automatically increases my speed by 69mph. so therefore if it wasnt gaper day i was really doing a solid 27.6 mph. science
You didnt even hit relatively close to 96.6. You literally wouldnt be able to control a pair of skis under 210 if you were going that fast.
/end thread
AHussYou didnt even hit relatively close to 96.6. You literally wouldnt be able to control a pair of skis under 210 if you were going that fast.
/end thread
have you ever heard of kitten factory skis?? ;) ;) ;) no need for extra length when you got that carbon fiber . also, no need to control. just sit back and straight line. at this point i know we didnt go 90mph so im just being a tool.
if the phone shifts in the pocket, such as moving forward just a tad this can increase the speed greatly. Say you're doing 60 and it (or your body) moves forward at all. The app will think that it is an increase in speed
hmm i wonder what the record speed for off piste would be. I've straight lined steep groomers on super g skis before, but I'm pretty sure I've gone faster in chutes
I'd say it's wrong and you could have been doing 70mph. The obvious solution is to test it again, and get your buddy to download the app and do it at the same time too
auskiI'd say it's wrong and you could have been doing 70mph. The obvious solution is to test it again, and get your buddy to download the app and do it at the same time too
I've done this before putting 2 phones with the app going in the same pocket. They were consistently off by 20 to 30 % of each other. Sometimes they'd be close.
As was said, it's definitely because of poor altitude accuracy.
Anybody that thinks these dudes hit 96 mph without a speed suit and a ridiculous hill is an idiot. Speed Skiers fucking struggle to hit 100 in those special suits going straight down steep ass specially groomed runs. I'm not sure you can even go faster than like 60-65 with normal clothing.
The fastest I have been clocked at on a pretty steep wide open straight run was 68 mph. I just physically couldnt go faster. The wind drag was so noticable at that speed on my clothes (normal fitting ski clothes). I am an ex racer and don't think speeds above 75-80 TOPS is really possible on most runs in normal ski clothes. Skin suits help a lot.
Were you in a tuck? If you were on the run I'm thinking of at Pebble it's totally possible to hit terminal velocity before the runout, so quite possibly high 60s to low 70s in a good tuck with baggy outerwear. With a bit of a tailwind you might be able to hit 90. I think a lot of the haters don't understand how steep Pebble actually is/how a ski that isn't an under-damped noodle performs.
grifrowlWere you in a tuck? If you were on the run I'm thinking of at Pebble it's totally possible to hit terminal velocity before the runout, so quite possibly high 60s to low 70s in a good tuck with baggy outerwear. With a bit of a tailwind you might be able to hit 90. I think a lot of the haters don't understand how steep Pebble actually is/how a ski that isn't an under-damped noodle performs.
full tuck the ENTIRE time. if you were even out of position the slightest you could feel a HUGE difference in wind resistance and speed. ... and yea im still blown away how damp the rayzrs were.