What your best average for +50 AND Younger Commmuters?
12-16-05, 01:04 PM
#26
No one carries the DogBoy
Originally Posted by caloso
212 watts for a non-dawdling commute.
Just for fun, I put in some numbers from the Saturday hammerfest: 557 W for the 27mph paceline but 1023 W for the county line sprint (34mph peak speed)! The graph must shoot straight up! (For you physics/math geeks: is this a geometric progression?)
Just for fun, I put in some numbers from the Saturday hammerfest: 557 W for the 27mph paceline but 1023 W for the county line sprint (34mph peak speed)! The graph must shoot straight up! (For you physics/math geeks: is this a geometric progression?)
Quadratic Velocity Dependence
For large objects moving through air, the air resistance is approximately proportional to the square of the velocity. The form of the resistance is F=1/2CpAv^2
where p is the air density, A the crosssectional area, and C is a numerical drag coefficient. The drag coefficient C is 0.5 for a spherical object and can reach 2 for irregularly shaped objects according to Serway.
For large objects moving through air, the air resistance is approximately proportional to the square of the velocity. The form of the resistance is F=1/2CpAv^2
where p is the air density, A the crosssectional area, and C is a numerical drag coefficient. The drag coefficient C is 0.5 for a spherical object and can reach 2 for irregularly shaped objects according to Serway.
12-16-05, 01:13 PM
#27
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So it would make a lot of sense to learn to sprint low to the bars. Standing straight up is really going to increase that A value.
12-16-05, 06:09 PM
#28
Sensible shoes.
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So for frame of reference, what's the peak output of say LA, or an olympic sprinter,and such? Some of the sprints I've punched into this thing give--conservatively--numbers like 1,300 watts. That just don't seem right.
12-16-05, 06:36 PM
#29
Portland Fred
Originally Posted by CastIron
So for frame of reference, what's the peak output of say LA, or an olympic sprinter,and such? Some of the sprints I've punched into this thing give--conservatively--numbers like 1,300 watts. That just don't seem right.
(1300 Watts * .1 hr)/1.163) ~ 112 Calories
With 25% efficiency you'd have to consume almost 450 calories. At 20% efficiency, that's 560 Calories
That's a Big Mac -- better eat hearty!
12-16-05, 07:09 PM
#30
Senior Member
I don't have any method of measuring my power, but I do remember one summer evening a couple of summers ago when I seemed to be over 1,000 on the enjoyment scale.
12-16-05, 09:44 PM
#31
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Im 43 and looks like I got a 390 Watts and 1100 calories for my 12 mile commute. My tires are bigger than the 1.75s on the calculator. This is about the wattage that I produced recently on a hotel's Lifecycle. I never tried to peak the wattage, I suspect I could sprint to 500. Wonder if I could put a generator on my spin bike and come up with a watt value.
