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Problem for you engineering types

Old 04-04-09, 11:56 PM
  #1  
snoboard2
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Problem for you engineering types

A few of us are in Banner Elk, NC for their race this weekend. They had an awesome uphill TT that was 5.3 miles long and gained 1428 feet of elevation (avg grade of 5.1%). For the sake of this problem lets say it was a constant grade.

I don't have a power meter, but my buddy does. I was hoping i can calculate (though various awesome online power calculators such as http://www.analyticcycling.com/ForcesPower_Page.html) my power for the climb.

His stats for the ride:
65 kg rider
9 kg bike/gear
~28 minute time (11.36 mph avg)
exactly 300w for the ride


My stats:
74 kg rider
10 kg bike/gear
~27 minute time (11.78 mph avg)

Basically I put in his gear/rider weight and played with the grade and speed a bit till the output said ~300w. Then I put in my higher weight/speed leaving everything else the same. After putting all the info i got anywhere from 330-350w for my effort on the ride.

Course: http://www.mapmyride.com/ride/united...23799046470167

Last edited by snoboard2; 04-05-09 at 12:01 AM.
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Old 04-05-09, 04:53 AM
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What's the problem again?
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Old 04-05-09, 05:56 AM
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They should have made you guys climb Beech mountain.

I've been down the route you all did many times but never up it.
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Old 04-05-09, 06:04 AM
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Originally Posted by snoboard2 View Post
uphill TT that was 5.3 miles long and gained 1428 feet of elevation (avg grade of 5.1%). For the sake of this problem lets say it was a constant grade.
We have a very similar TT here (almost the exact same length and vertical rise) that I do in May, the High Point TT in northwestern NJ.

It's never a constant grade. For example the High Point course goes 3%-5%-7%-flat-( -1)%-8% and then a couple of 12-15% grinders near the end. Just do the friggin ride and get your official time. Problem solved.
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Old 04-05-09, 07:08 AM
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How close was his "calculated" power to what his power meter reported? You are are lucky it wasn't steeper
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Old 04-05-09, 07:09 AM
  #6  
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I don't understand the problem.
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Old 04-05-09, 08:46 AM
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I don't see the question to the problem anywhere.
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Old 04-05-09, 09:12 AM
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Wanders, we've got to start our collegiate team. We're missing out on some good racing.
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Old 04-05-09, 09:35 AM
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Originally Posted by Hocam View Post
What's the problem again?
You're not reading between the lines.

Obviously, the answer is 42.
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Old 04-05-09, 12:52 PM
  #10  
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Is Lees McRae getting their collective asses kicked?
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Old 04-05-09, 12:55 PM
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I was the "buddy with the power meter." I think that he is looking at what his power was for the climb.

umd, my average power was exactly 300 for the climb.
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Old 04-05-09, 01:02 PM
  #12  
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Originally Posted by JaRow View Post
Is Lees McRae getting their collective asses kicked?
Mostly no. A lot of strong guys from there.
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Old 04-05-09, 01:57 PM
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it pitched up a few times and the climb started after a mile of flats, so it was really a lot steeper than 5%

I was hoping i can calculate (though various awesome online power calculators such as http://www.analyticcycling.com/ForcesPower_Page.html) my power for the climb.
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Old 04-05-09, 06:52 PM
  #14  
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Technically not a question!
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Old 04-05-09, 08:01 PM
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What are you trying to solve? I would just go to that climb and do TT repeats in various gear combinations and see what my times are. Knowing average power won't help you if you don't have power-meter to refer to during the event anyway. And the last 5-8 minutes, you'll be above your FTP power anyway.
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Old 04-05-09, 10:16 PM
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Originally Posted by TideCrazy3193 View Post
Mostly no. A lot of strong guys from there.
Very true. Well, I hope you guys did well.
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Old 04-05-09, 10:44 PM
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The question seemed pretty straightforward to me: his friend did it in Xmin and weighs Xkg and averaged 300 watts - if the OP did it one minute faster and weighs 9kg more, how many more watts was he putting out?
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Old 04-06-09, 06:18 AM
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Originally Posted by TideCrazy3193 View Post
Mostly no. A lot of strong guys from there.
And you can't ride out of banner elk without hitting a climb anywhere.

Some great riding there. You should take the road to "Oz" next time, that will leave you seeing circles and stars.

I blew a tube descending Beech Mountain last summer, good times.
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Old 04-06-09, 07:30 AM
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Originally Posted by pacificaslim View Post
The question seemed pretty straightforward to me: his friend did it in Xmin and weighs Xkg and averaged 300 watts - if the OP did it one minute faster and weighs 9kg more, how many more watts was he putting out?
Bingo.

Banner elk is awesome riding. Beech mountain is awesome. Looks like a lot of fun, unfortunately with the time trial and the race the next day we didnt get a chance to do it. Hopefully soon though.

James, we did alright. I came in 6th in the TT and 11th in the RR. The race was rediculous in itself.
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Old 04-06-09, 07:40 AM
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Originally Posted by snoboard2 View Post
Basically I put in his gear/rider weight and played with the grade and speed a bit till the output said ~300w. Then I put in my higher weight/speed leaving everything else the same. After putting all the info i got anywhere from 330-350w for my effort on the ride.
Yes, but he already answered that question.
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Old 04-06-09, 10:22 AM
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Originally Posted by Hocam View Post
What's the problem again?
The problem is the OP is too fat for this sport (not to mention his bike and gear).
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Old 04-06-09, 10:32 AM
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Originally Posted by snoboard2 View Post
Basically I put in his gear/rider weight and played with the grade and speed a bit till the output said ~300w. Then I put in my higher weight/speed leaving everything else the same. After putting all the info i got anywhere from 330-350w for my effort on the ride.
Seems like a sound approach.
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Old 04-06-09, 10:39 AM
  #23  
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Originally Posted by Phantoj View Post
Seems like a sound approach.
Yes. For the 3rd or 4th time, what is the OPs question?
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Old 04-06-09, 05:40 PM
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Originally Posted by pacificaslim View Post
The question seemed pretty straightforward to me: his friend did it in Xmin and weighs Xkg and averaged 300 watts - if the OP did it one minute faster and weighs 9kg more, how many more watts was he putting out?
Exactly. I'm really just looking for someone to double check my methods. I know it's not really an accurate model of my efforts, but it's better than nothing.
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Old 04-06-09, 05:46 PM
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Originally Posted by snoboard2 View Post
Exactly. I'm really just looking for someone to double check my methods. I know it's not really an accurate model of my efforts, but it's better than nothing.
It seems like what you did is going to be as good an estimate as you can hope for without a meter. I use online calculators to gauge my power output on specific hill climbs, but really only to measure progress, not for an absolute power output.
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