On Wed, 21 May 2003 09:47:17 GMT,
Tenex <
[email protected]> wrote:
> andy_welch wrote:
>> Tim Woodall wrote:
>> > On Mon, 19 May 2003 18:41:44 GMT, Tenex <
[email protected]> wrote:
>> > > Tim Woodall wrote:
>> > 557*4200/3600 = 650W.
>>
>>
>>
>> Is that right? 650W sounds awfully high for trundling along the flat at 16mph. Isn't that more
>> "Lance going up a mountain" power?
>
AIUI, 650W is fuel burned (i.e. calories consumed). At 25% efficiency this is about 160W
power output.
>
> Consider that involves one hour's effort of moving approx. 170lbs. Doesn't seem too high.
>
> OTOH, I'm not sure Tim was being complimentary about my rowing performance, which I think is a
> useful means of burning calories at almost twice the rate of 16 mph cycling. ;-)
>
Wasn't intended to either be or not be complimentary. You are comparing 5 mins on a rowing machine
(at I assume a high effort) with a gentle trundle on a bike. Based on the same table I burn
something like 700 cal/day just commuting. This works out at about 65cal per 5 mins, 816W or,
assuming 25% efficiency just over 200W power output.
Of course, my commute isn't completely flat (gains about 150 feet in 8 miles) with some (minor) ups
and downs in the middle. While this doesn't seem like a lot, I regularly average 20mph+ on the way
home and on a couple of occasions averaged 25mph+[1] (probably with a tail wind as well
while I
rarely manage 20mph on the way to work (I'm also not prepared to push quite as hard on the way to
work as I don't want to get too hot)
Regards,
Tim.
[1] Unfortunately I didn't time my fastest ever journey. All I know is that from getting up
from my desk to get changed to getting into the house (after putting the bike in the shed)
was 25 minutes.
--
God said, "div D = rho, div B = 0, curl E = - @B/@t, curl H = J + @D/@t," and there was light.
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