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Killington Nov 17 2013 ... Springish... and now I can prove my speed
- Thread starter bdfreetuna
- Start date
C-Rex
New member
I love these threads.
The app is more accurate in things besides max speed because it has more date points with which to calculate those things. Max speed is probably calculated by finding the most distance you covered between data points. If it takes a data point, say for example, once every half second, and you cover 50 feet between the two, you're doing 100ft/sec. Now, a phone GPS is only accurate to around 10 yards, if that, it certainly could be less accurate, and almost certainly will not be more accurate than that. For the sake of this post we'll say it accurate to within 10 yards. So that gives you +/- 20 yards of error in the distance calculation since we're talking about 2 data points. This means if you actually traveled 50 ft between data points, the phone may think you traveled anywhere between 30 and 70 ft. That will throw off your max speed quite a bit but average speed and all the rest will be ok because with more data points comes more accuracy.
dlague
Active member
I think this is where everyone starts to develop doubt
Since the fasted speed recorded in world cup ski racing is 100.6 MPH (very brief) and average speeds (full run) of the best world cup skiers are around 79 MPH and the average speed going through the finish line is around 47 MPH under world cup skiing conditions with no fog, I have to say your story becomes a little hard to believe. Remember they have skin tight race suits on! The wind resistance alone on you jacket and ski pants makes this story tough!
Plus what if a deer jumped out on the trail - you would have scared the shit out of it! Sorry dude - I think skiing fast is fun but no mater what anyone says - it is dangerous no matter how good someone is.
bdfreetuna
New member
Well I guess I wasn't going 76 since the app seems unreliable, so dontcha worry too much
Trust I was pleasantly surprised when I saw the numbers on the app. I figured I was doing more like 60-something but I believed what the app said.
Trust I was pleasantly surprised when I saw the numbers on the app. I figured I was doing more like 60-something but I believed what the app said.
Puck it
Well-known member
Free apps are never right, you should have paid the $0.99 for the full version.
dlague
Active member
That's ok - you are not the first to make such claims and you will not be the last! Funny thing is - the result is always the same!
Puck it
Well-known member
dlague
Active member
What is BS That it is OK? or the result is always the same? Not getting it!
Puck it
Well-known member
dlague
Active member
bdfreetuna vs Highway Star?
Puck it
Well-known member
Do you have a better choice? HS is the real deal!!!!!!!
dlague
Active member
Na! Skiing is chill - everyone will do their own stuff and just enjoy the season for what it is worth! The best challenge is within yourself!
Everyone has a story - take them with a grain of salt! If you see it - great - you are a witness! If not - it is a story!
Puck it
Well-known member
dlague
Active member
:razz: Don't know the "Highway Star". Sacrilege!!! Was it a similar thread?
bdfreetuna
New member
I don't know Highway Star but I'll gladly ski off anyone in this thread who was raining on my little parade. 
I love these threads.
The app is more accurate in things besides max speed because it has more date points with which to calculate those things. Max speed is probably calculated by finding the most distance you covered between data points. If it takes a data point, say for example, once every half second, and you cover 50 feet between the two, you're doing 100ft/sec. Now, a phone GPS is only accurate to around 10 yards, if that, it certainly could be less accurate, and almost certainly will not be more accurate than that. For the sake of this post we'll say it accurate to within 10 yards. So that gives you +/- 20 yards of error in the distance calculation since we're talking about 2 data points. This means if you actually traveled 50 ft between data points, the phone may think you traveled anywhere between 30 and 70 ft. That will throw off your max speed quite a bit but average speed and all the rest will be ok because with more data points comes more accuracy.
That was a good explanation. I would add that probably more accurate speed sensors use more than 2 data points and place them on a curve so it averages out, so your max speed is really the max speed you had over, say, at least a few seconds as opposed to that microsecond top speed.
60 sounds totally reasonable and doable. It's a significant difference to nearly 80.
I would also say to try either Google MyTracks (free) . That's been pretty accurate for me.
Puck it
Well-known member
I don't know Highway Star but I'll gladly ski off anyone in this thread who was raining on my little parade.
A little advice below.
bdfreetuna
New member
Come to Berkshire East this year we'll see who gets down faster =)
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