Kurt K power computer with Cycleops Trainer?
01-09-10, 08:29 PM
#26
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20 mph = ((5.244820)(20)) + ((0.01968)(20^3)) = 262 watts.
Look at this chart for watts per kg for specific abilities
https://www.cyclingpeakssoftware.com/...profile_v4.gif
This is the formula for power on a KK Road machine where x is speed in mph.
((5.244820)(x)) + ((0.01968)(x^3))
Here is the chart made from the formula above for the power levels of a KK Road Machine Trainer. I have a powertap and my power is always within 5 watts of the chart.
https://www.kurtkinetic.com/documents..._Curves419.pdf
Take your weight and convert to kg. find a w/kg at a level you think you might be in the FTP column. find the watts and corresponding speed to get those watts. get on the trainer and see if you can hold it for an hour. if you dont have an hour do it for 20 minutes but your ftp will be 95% of the 20 minute power.
Look at this chart for watts per kg for specific abilities
https://www.cyclingpeakssoftware.com/...profile_v4.gif
This is the formula for power on a KK Road machine where x is speed in mph.
((5.244820)(x)) + ((0.01968)(x^3))
Here is the chart made from the formula above for the power levels of a KK Road Machine Trainer. I have a powertap and my power is always within 5 watts of the chart.
https://www.kurtkinetic.com/documents..._Curves419.pdf
Take your weight and convert to kg. find a w/kg at a level you think you might be in the FTP column. find the watts and corresponding speed to get those watts. get on the trainer and see if you can hold it for an hour. if you dont have an hour do it for 20 minutes but your ftp will be 95% of the 20 minute power.
Based on this, I cant really tell https://www.kurtkinetic.com/documents...ner_manual.pdf
J.
01-09-10, 08:37 PM
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20 mph = ((5.244820)(20)) + ((0.01968)(20^3)) = 262 watts.
Look at this chart for watts per kg for specific abilities
https://www.cyclingpeakssoftware.com/...profile_v4.gif
This is the formula for power on a KK Road machine where x is speed in mph.
((5.244820)(x)) + ((0.01968)(x^3))
Here is the chart made from the formula above for the power levels of a KK Road Machine Trainer. I have a powertap and my power is always within 5 watts of the chart.
https://www.kurtkinetic.com/documents..._Curves419.pdf
Take your weight and convert to kg. find a w/kg at a level you think you might be in the FTP column. find the watts and corresponding speed to get those watts. get on the trainer and see if you can hold it for an hour. if you dont have an hour do it for 20 minutes but your ftp will be 95% of the 20 minute power.
Look at this chart for watts per kg for specific abilities
https://www.cyclingpeakssoftware.com/...profile_v4.gif
This is the formula for power on a KK Road machine where x is speed in mph.
((5.244820)(x)) + ((0.01968)(x^3))
Here is the chart made from the formula above for the power levels of a KK Road Machine Trainer. I have a powertap and my power is always within 5 watts of the chart.
https://www.kurtkinetic.com/documents..._Curves419.pdf
Take your weight and convert to kg. find a w/kg at a level you think you might be in the FTP column. find the watts and corresponding speed to get those watts. get on the trainer and see if you can hold it for an hour. if you dont have an hour do it for 20 minutes but your ftp will be 95% of the 20 minute power.
Ok well, my wieght in kg is 63.5. For 20 minutes without training for it, I can go 20 minutes at 20 mph thus 290/63.5= 4.56. This is in the CAT 2 section of the graph?
01-09-10, 08:41 PM
#28
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^ FTP is one hour power. You have to reduce it on a 20 minute test.
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You could hit a tree and die.
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01-09-10, 08:59 PM
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I think you need to check your math there. You're more like 262 * .95 / 63.5 = 3.94W/Kg if your kk is accurate. I've found the resistance to vary with time/temperature so it might be within 10% of actual power.
01-09-10, 09:11 PM
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Cool thanks, for some reason I had the notion that 20 mph = 300 W. Well cat 3 is not so bad with no training. Not saying I am remotely ready for a cat 3 race haha. I should stop smoking and dedicate myself. Hrm decisions decisions.
01-09-10, 09:14 PM
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That's not how it works and that's not what the chart means.
01-09-10, 09:29 PM
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a) He wasn't saying that you calculated 20mph wrong, just that FTP isn't 20 minute power. You missed the part where you have to take 95% of that. That's only an approximation, some people lose more than 5% of their 20 minute power for an hour, especially people with high anaerobic capacity.
b) The labels themselves are actually quite meaningless and arbitrary. For each column, the top and bottom numbers are fixed and the rest of the numbers are distributed evenly. The chart isn't intended to say you ride at a cat x level, or that you would be successful at that level, or that it would even be sufficient to get to that level. The intent of the chart is to see your "profile," or your relative strength in each duration. The shape of your profile indicates where your strengths or weakness are.
It's really quite involved, but if you are interested in learning more, read this.
b) The labels themselves are actually quite meaningless and arbitrary. For each column, the top and bottom numbers are fixed and the rest of the numbers are distributed evenly. The chart isn't intended to say you ride at a cat x level, or that you would be successful at that level, or that it would even be sufficient to get to that level. The intent of the chart is to see your "profile," or your relative strength in each duration. The shape of your profile indicates where your strengths or weakness are.
It's really quite involved, but if you are interested in learning more, read this.
01-10-10, 09:56 AM
#34
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If your 5 second power is well above your one hor power, your more of sprinter.
If your power profile slopes upward to the right (i.e.your power is relatively better as the durationss increase, you're more of a clssic time trialist,etc.
The shape of your profile will tell you what weaknesses you need to train, and what strengths you can race.
The absolute numbers won't do much other than either 1) depress you, or 2) give you false hope.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.
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You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.
01-10-10, 10:35 AM
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Also, for me, the KK power curve was waaaay off when compared to my PM during the same session. Estimated power is stupid IMO.
01-10-10, 11:03 AM
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It should also be mentioned that the numbers really don't matter, it's how they're applied. Even if I could put out 500W for an hour, if I'm pulling the field in a race that whole time I'm gonna blow up and fall off the back.
The numbers are just a point to set goals and measure progress. They could really be anything, just as long as they're consistent. The fewer unaccounted variables, the better. That's why power is nice, it's a rate of work performed which is independent of a lot of other factors (wind, hills, etc.)
The numbers are just a point to set goals and measure progress. They could really be anything, just as long as they're consistent. The fewer unaccounted variables, the better. That's why power is nice, it's a rate of work performed which is independent of a lot of other factors (wind, hills, etc.)
01-10-10, 06:05 PM
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It's really quite involved, but if you are interested in learning more, read this.
They're not going to tell with any certainty how you compare to someone else (unless that's already obvious). Someone who can put out the same power, or even slightly less, may be able to do it in a more aerodynamic position. This is where trainer numbers may fail you. It's easy to get sloppy if you don't have to think. Sprinting on my Road Machine feels entirely different than on the road, due to balance issues.
Last edited by tadawdy; 01-10-10 at 06:09 PM.
01-11-10, 04:17 AM
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To illustrate, if your 5 second, 1 minute, 5 minute, and One hour power all fall in the same horizontal range on the chart, you're an all arounder, with no greeat relative strengths or weakness.
If your 5 second power is well above your one hor power, your more of sprinter.
If your power profile slopes upward to the right (i.e.your power is relatively better as the durationss increase, you're more of a clssic time trialist,etc.
The shape of your profile will tell you what weaknesses you need to train, and what strengths you can race.
The absolute numbers won't do much other than either 1) depress you, or 2) give you false hope.
If your 5 second power is well above your one hor power, your more of sprinter.
If your power profile slopes upward to the right (i.e.your power is relatively better as the durationss increase, you're more of a clssic time trialist,etc.
The shape of your profile will tell you what weaknesses you need to train, and what strengths you can race.
The absolute numbers won't do much other than either 1) depress you, or 2) give you false hope.
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