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# How fast do you ski? - Page 8

Quote:
 Originally Posted by mdf Once you approach your personal speed limit, whether of you equipment (mechanical engineering) or your skills (phys ed) or courage (creative writing), a little bit faster feels a whole lot faster (psychology). Calling it "exponential" (mathematics) is acceptable (philosophy) hyperbole (literature). [Not to be confused with hyperbola (geometry).]
Yes. As you demonstrate, it's less matter of knowing math than being a polymath.

And a hyperbola is the path (approximately) that you follow through the air when you go over even a gentle roll at 70 mph.
Quote:
 Originally Posted by sjjohnston Yeah, pretty much.
Thanks!
Jeez Dog ,I gots a JOB.

When I'm in the mood to bomb a trail I...

1) Do a few runs on the trail to check conditions and notable obstacles.

2) Check for trail to be clear, I usually have a friend go down halfway and call it out.

3) Strip to speed suit, and switch out to my GS/DH skis.

So far I have not ran into any trouble doing this, but before I started to use these steps I would get the occasional warning from the ski patrol for speeding on certian trails. My record speed to date is 87mph.

To add onto that, GPS systems can be innaccurate for tracking speeds while skiing. GPS systems log linear movement, and while you are skiing you are going down hill. So, the GPS speeds you see are a bit slower than you are actually going. I use a combination of GPS and 100 ft markers to track my speed.
That's what I was thinking... if a GPS is inaccurate, it's going to be low. If I understand correctly, a GPS generally measures horizontal displacement. The horizontal displacement is less than the length of the Hypotenuse (the trail, in this case), therefore, the GPS thinks you are going a shorter distance in a period of time which will register as slower than you are actually going.
My GPS logs give horizontal coordinates, elevation, direction of travel distance, time and speed between logged points. Comparing horizontal coordinates in track logs reveals that the reported speed in the logs is a simple distance traveled between logged points divided by time interval logged between logged points. The error due to the slope is small at most ski resorts. A greater error making the reported speeds lower than actual speeds is due to the distance between logged points being chord length and not arc lengths, but people are generally going fairly straight when shooting for top speed. I'm not sure how the max speed feature works. I've heard it uses the Dopler shift of the signal carrier wave on the more expensive units. All I can tell you is it is often higher than the highest logged speed.

### Change in plans

There has been a change of plans regarding the upcoming 5th Annual Radar Speed Trap Day: Session 2 has been canceled and will either be held Friday, the 4th of May, or Saturday, the 5th, depending on the weather.

See you there!
Quote:
 Originally Posted by Rise To The Top When I'm in the mood to bomb a trail I... 1) Do a few runs on the trail to check conditions and notable obstacles. 2) Check for trail to be clear, I usually have a friend go down halfway and call it out. 3) Strip to speed suit, and switch out to my GS/DH skis. So far I have not ran into any trouble doing this, but before I started to use these steps I would get the occasional warning from the ski patrol for speeding on certian trails. My record speed to date is 87mph. To add onto that, GPS systems can be innaccurate for tracking speeds while skiing. GPS systems log linear movement, and while you are skiing you are going down hill. So, the GPS speeds you see are a bit slower than you are actually going. I use a combination of GPS and 100 ft markers to track my speed.
You wear your GS suit freeskiing? Why......
Quote:
 Originally Posted by doublediamond223 You wear your GS suit freeskiing? Why......
Why not? It certainly makes a different fashion statement than the famous Stihl hats.

On a recent day at the basin I saw Jeff B wearing an old Austrian national team suit with a pair of spyder shorts and suspenders over the suit. It was sort of a lederhosen on steriods approach to things...
I'm here to post in this very important thread that, without exception, freeskiing in a GS suit is the ultimate gaper move- no matter how well you ski or how many NASTAR medals you have.
Quote:
 Originally Posted by viking kaj Why not? It certainly makes a different fashion statement than the famous Stihl hats.
Maybe you've never worn one, but they are not comfortable at all, fashion aside. Also, skiing in a suit without at least training shorts to protect it is a great way to mess up your suit.

Quote:
 Originally Posted by Takecontrol618 I'm here to post in this very important thread that, without exception, freeskiing in a GS suit is the ultimate gaper move- no matter how well you ski or how many NASTAR medals you have.

Agreed. Are you listening, Heluva? (He uses his as thermal underwear when skiing pow)
Quote:
 Originally Posted by doublediamond223 You wear your GS suit freeskiing? Why......
Well, for some of the faster speeds, I usually plan it out, but other than that, I usually wear under armor underneath my jacket.
Quote:
 Originally Posted by doublediamond223 Maybe you've never worn one, but they are not comfortable at all, fashion aside. Also, skiing in a suit without at least training shorts to protect it is a great way to mess up your suit. Agreed. Are you listening, Heluva? (He uses his as thermal underwear when skiing pow)

I cannot remember the last time I skied without my DH suit. I really feel naked when I dont wear it, granted I wear it under my jacket most of times (Exept in trainning where you got to train like you race ) But yea I dont think I can ski without it... Its warm-er... thats all I got O_o
GS suite free-skiing (or between race runs) gaper antidote....

Take some old school grey sweatpants (got mine at goodwill for \$2) and cut off legs - leave 'em long. Wear over the GS suit on race night. Pull 'em off and stuff into you parka sleeve. Viola. Ghetto "training shorts."

Note. Not too great for wet conditions.
not sure if anyone has posted this in the thread, but there is a great radar based speedometer found here. http://www.amazon.com/Tech-O-SI-Ski-Speedometer/dp/B000EQ82IM it will settle a lot of bets and I am sure I will find out out that I don't ski as fast as I think, but it will be fun to play with!
There are a lot of very fast skiers posting in this thread, but I doubt any of you can ride lifts as fast as I can.
Quote:
 Originally Posted by Woodstocksez There are a lot of very fast skiers posting in this thread, but I doubt any of you can ride lifts as fast as I can.
You right. Alta is know for it's "slow" lifts. I'm sure all of you ride lifts faster than me...
Quote:
 Originally Posted by TMAS29 I cannot remember the last time I skied without my DH suit. I really feel naked when I dont wear it, granted I wear it under my jacket most of times (Exept in trainning where you got to train like you race ) But yea I dont think I can ski without it... Its warm-er... thats all I got O_o
You're an active fis racer though, it's different...
Quote:
 Originally Posted by Finndog not sure if anyone has posted this in the thread, but there is a great radar based speedometer found here. http://www.amazon.com/Tech-O-SI-Ski-Speedometer/dp/B000EQ82IM it will settle a lot of bets and I am sure I will find out out that I don't ski as fast as I think, but it will be fun to play with!
interesting, but if it's based on radar, is it using stationary objects to calculate speed? If it is, knowing I've had trees jump out in front of me, and since even they move, how accurate could it be?
Quote:
 Originally Posted by 2-turn interesting, but if it's based on radar, is it using stationary objects to calculate speed? If it is, knowing I've had trees jump out in front of me, and since even they move, how accurate could it be?

I dont know about those evil tree trolls but it is very accurate in open terrain.
Originally Posted by Atomicman

The fastests 17-20 year olds and top Western region racers at Mammoth in a downhill on race prepped 210cm + skis in speed suits and in a tuck on race prepped closed course Tops 70MPH.

You guys are smoking crack and some of the smoke got into your GPS's! :

Westy:

Completely agree, it is very unlikely that you were actually reaching those speeds. Convert MPH to KPH and maybe that is correct. The video you posted doesn't look fast at all. Not tring to take anything away from you as you do ski well but I fail to see those speeds.

### UPDATE on contact info

If you're bringing a radio, we'll be using the maggot channel, 5:13, to set up the radar runs.
Gee.. I figured you be using channel 4:20....
Quote:
 Originally Posted by endlessseason If you're bringing a radio, we'll be using the maggot channel, 5:13, to set up the radar runs.
And if I come, which I'm not sure of at this point (the rivers are calling me), it would be interesting to do some side by side GPS testing as well. I've got 2 units I could bring.
Quote:
 Originally Posted by doublediamond223 Maybe you've never worn one, but they are not comfortable at all, fashion aside. Also, skiing in a suit without at least training shorts to protect it is a great way to mess up your suit.
Actually I have, but who says fashion is comfortable? Those horns I wear can be extremely warm for spring skiing. And what do you think Plake puts up with everytime he has to color his mohawk for a new sponsor?
just a reminded too everyone tomorrow tram deck 8:45 for the annual snowbird radar day. If your in Utah and dont come your a wimp!!!! :P
You guys arent untited to your opinions anymore we have radar gun results.

http://www.tetongravity.com/forums/s...6&postcount=21

listed in the thread are the fastest results for anyone. My speed was done on a Blue/Black know as Mark Malu. Other notable speeds.

First run out for me I hit 62mph would later hit 69 mph in the same spot in mineral.

GS Turns down A blue/black in mineral I was going 48mph.

62mph on Bassackwards a Blue

44 on Upper Emma taken while turning

63 on Lower Emma a green.

I was using 183 Volkl Gotamas, wearing Baggy clothes.

to anyone that was in utah and didnt show up I will consider you a arm chair quarterback untill you show up.

to anyone that says that you need a speed suit to break 40mph I am sorry cause you have no freaking clue. 40mph was easily attained while turning not even straightlining.
Not that it really matters, at least to me, but did you get to compare gps data and radar data?
Correct me if I'm wrong here. GPS measures your speed based upon the time it took you to get from point A to point B on a horizontal plane. While most GPS's will give you elevation, they do not take elevation changes into account when factoring speed. Therefore it would seem the steeper the slope the less accurate your GPS speed would be.

Example: If I were to jump straight down off a 100 story building, my GPS would not give me my speed since I am traveling on the vertical plane, not horizontal. Every time my GPS would send/receive a signal it would register no change in position.

Is this a correct assumption?
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