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Old 04-08-09, 11:16 AM   #501
Apus^2
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Apus, post your mean maximal power curves from from when you started until now. that's some crazy improvement.
Sorry, just saw this.

I'm not sure how helpful it would be--I've been using a p-tap for 4 months so I don't have a wealth of information. But here is an MMP for NP with December's and up to today's data.
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Old 04-08-09, 11:23 AM   #502
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Just under 300 watts for over 3 1/2 hours....way better than I'll ever see.
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Old 04-08-09, 11:24 AM   #503
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Np! Average power for that race was 264. I was up front doing a lot of work and trying to get in breaks, etc.
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Old 04-08-09, 11:32 AM   #504
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Cool chart. Using density altitude and this chart, this may help you figure out why you had an 'off' day, other than just using TSB. In low temps and high pressure fronts, density altitude can be in the NEGATIVES, so you will probably set FTP records. On hot, humid, low pressure days, even if you are near sea level, the density altitude may be 3000-4000 ft, and you may see a 4-5% drop in power.

Altitude
Feet Meters % FTP
0 0 100%
1000 300 99%
2000 610 98%
3000 910 96%
4000 1220 95%
5000 1520 93%
6000 1830 92%
7000 2130 90%
8000 2440 88%
9000 2740 86%
10,000 3050 83%
11,000 3350 81%
12,000 3660 78%
13,000 3960 75%
14,000 4270 72%

So does this mean I can add 7% to my FTP for the purpose of these forums? I live at 5,012 ft. Or does acclimatization account for that.


Apus, that's still impressive how much do you weigh?
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Old 04-08-09, 11:37 AM   #505
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So does this mean I can add 7% to my FTP for the purpose of these forums? I live at 5,012 ft. Or does acclimatization account for that.


Apus, that's still impressive how much do you weigh?
A bit more info.
http://midweekclub.ca/powerFAQ.htm#Q17

edit: Granted the study was done with runners, but it's still relevant.
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Old 04-08-09, 12:51 PM   #506
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So does this mean I can add 7% to my FTP for the purpose of these forums? I live at 5,012 ft. Or does acclimatization account for that.


Apus, that's still impressive how much do you weigh?
Dude, back in '92, my first year racing, I was still a 4, living in Denver. I drove to San Antonio overnight to meet my girlfriend's family (now my wife). I did a race the next day, a weekday crit, and I was pwning the Cat 2s. It was amazing. HR was way low for RPE.

Of course, in 1992, TX racing was nowhere near the level of Colorado. But still.
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Old 04-08-09, 01:06 PM   #507
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Thanks for the link Esammuli. Looks like I need to start adding 5.6% to my FTP eWang Maybe more since I always do those test on a long climb, which goes from 6k-8k feet.

Just kidding of course. That would be silly

WR, I do notice that when I head down to sea level. It took me forever to break some '09 power records I set while in California in mid-January, even though I was not as fit then as I was a month or so later. I generally see a 5% or so increase in power when I head back to the east coast too.
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Old 04-08-09, 01:07 PM   #508
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1.26s (0.794Hz)
The internal sampling rate would need to be higher than that. To get reasonably accurate data for cadences up to 180RPM the sample rate would need to be at least 12Hz. The integrated and filtered data may be logged and displayed at .794Hz
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Old 04-08-09, 01:53 PM   #509
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The internal sampling rate would need to be higher than that. To get reasonably accurate data for cadences up to 180RPM the sample rate would need to be at least 12Hz. The integrated and filtered data may be logged and displayed at .794Hz
Yep, you're right. I forgot that the hub records at 61Hz, and sends the average out every 1.26s. The head unit then records on these intervals.

There's something I read about the sample rate thought, that explains the PowerTap's stochastic data. There's some magic "bad" rpm where it will read all over the place (like 75 rpm), and then for another RPM (I think it's 95 rpm) it's really really smooth.

At any rate, at 100 rpm, a single pedal stroke is still going to be 0.3s, which will cover 18.3 samples at 61Hz. For the peak 25% of the stroke, it's probably only like 5 samples to cover it, so you will probably miss part of the spike.
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Old 04-08-09, 02:16 PM   #510
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Just geting up and running with a wired SL. USB Cradle

WKO+ Should be plug and play, no? Plug the unit into the cradle click the "go get it" button and it goes and gets it, correct?
I'm getting a timeout message some of the time and a somebody pressed cancel message if I don't get the timeout message. But never any download.

Loaded the poweragent software that came with the unit, no joy. Downloaded the latest from the Saris Website. Still no joy.
The firmware update seems to be seeing the head unit and I'm getting the host readout when it is in the cradle.
Spoke to Saris this morning, they sent me some links/instructions to hopefully fix the poweragent problem , but that still may leave me with WKO+ not working for downloads.

Help, I didn't want a really heavy cyclocomputer with no down load capability.
Ensure that you have the correct COM port selected on the WKO+ home page - should be under the application settings heading
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Old 04-08-09, 03:24 PM   #511
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Ensure that you have the correct COM port selected on the WKO+ home page - should be under the application settings heading
This may be it, since it's on com 6 or something.

The good news is I had a productive lunch. Laced a wheel and got power agent working so I at least can get the info out that way now. WKO still did not work but I'll try this when I get home.
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Old 04-08-09, 05:10 PM   #512
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There's something I read about the sample rate thought, that explains the PowerTap's stochastic data. There's some magic "bad" rpm where it will read all over the place (like 75 rpm), and then for another RPM (I think it's 95 rpm) it's really really smooth.
Maybe when a harmonic of your cadence is close to the sampling rate (something like beat notes when you mix two signals with similar frequencies).
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Old 04-08-09, 06:50 PM   #513
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Just geting up and running with a wired SL. USB Cradle

WKO+ Should be plug and play, no? Plug the unit into the cradle click the "go get it" button and it goes and gets it, correct?
I'm getting a timeout message some of the time and a somebody pressed cancel message if I don't get the timeout message. But never any download.

Loaded the poweragent software that came with the unit, no joy. Downloaded the latest from the Saris Website. Still no joy.
The firmware update seems to be seeing the head unit and I'm getting the host readout when it is in the cradle.
Spoke to Saris this morning, they sent me some links/instructions to hopefully fix the poweragent problem , but that still may leave me with WKO+ not working for downloads.

Help, I didn't want a really heavy cyclocomputer with no down load capability.
It'll do this if you have the computer upside down in the USB mount or not completely connected metal contacts to metal contacts. I know through experience...haha...I spent 10 minutes the first time downloading because it was on upside down (I could've sworn that's how the manual showed it going). LOL...you'd think an engineer working on his PhD would be able to figure this out quicker.
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Old 04-09-09, 12:10 AM   #514
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Speedster22 was correct. Needed to change the com setting. Everything works now.
This is surely not the most user friendly software in the world.
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Old 04-09-09, 05:21 AM   #515
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Maybe when a harmonic of your cadence is close to the sampling rate (something like beat notes when you mix two signals with similar frequencies).
yea it is cadences of increments of 47.5rpm (47.5, the popular 95, and 142.5) lead to some sort of change in the data.
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Old 04-09-09, 05:38 AM   #516
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I typed up a big question, but it's gone now.

What kind of weekly TSS do you guys run? I hear about 5XX being a big week for someone racing, but that doesn't work with my understanding. TSS is roughly hours * IF * 100, right? If I ride 10 hours a week, depending on intensity I would expect a TSS of 800. So how can you race on 6-7 hours a week? The guys I know who are doing well put in probably a minimum of 12 hrs/week.

The week after my heart surgery when I was trying to get back in 'with a medium vengence' I was at 675 in ~9 hours. what gives?
1000+, 1100 on hard weeks. 1200 if I I'm on a 13 day stretch.
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Old 04-09-09, 06:46 AM   #517
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I typed up a big question, but it's gone now.

What kind of weekly TSS do you guys run? I hear about 5XX being a big week for someone racing, but that doesn't work with my understanding. TSS is roughly hours * IF * 100, right? If I ride 10 hours a week, depending on intensity I would expect a TSS of 800. So how can you race on 6-7 hours a week? The guys I know who are doing well put in probably a minimum of 12 hrs/week.

The week after my heart surgery when I was trying to get back in 'with a medium vengence' I was at 675 in ~9 hours. what gives?
January: 450 TSS weekly average
February: 500 TSS weekly average
March: 600 TSS weekly average (737 max)
April: 500 TSS last week, tapering for back to back to back race weekends (6 races in 3 weeks)

Average 8 hours a week, strong cat 3, faster than some cat 2's, at least locally.
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Old 04-09-09, 09:15 AM   #518
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am i going to regret riding this thing in the rain?
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Old 04-09-09, 09:39 AM   #519
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Only if it's an older model PT. The newer wireless and carbon window models are perfectly fine.
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Old 04-09-09, 09:47 AM   #520
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I put saran wrap over the computer/mount so the connections stay dry
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Old 04-09-09, 10:26 AM   #521
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Only if it's an older model PT. The newer wireless and carbon window models are perfectly fine.
it's not a newer carbon window model. hmmmmm
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Old 04-09-09, 10:38 AM   #522
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Here's a new Power distribution chart based on a few weeks of harder riding and racing. Any guesses on FTP? Mines set at 260 right now.

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Old 04-09-09, 11:37 AM   #523
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Here's a new Power distribution chart based on a few weeks of harder riding and racing. Any guesses on FTP? Mines set at 260 right now.
From that, it could be anything. Just do a test.
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Old 04-09-09, 12:05 PM   #524
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just do a test.
+1
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Old 04-09-09, 12:24 PM   #525
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I'm gonna go with 750.
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