Re: Wind Resistance, Clothing, & Low-Hanging Fruit?
- From: "Phil Holman" <piholmanc@yourservice>
- Date: Tue, 29 Nov 2005 15:52:09 -0800
"Ron Ruff" <rruffrruff@xxxxxxxxx> wrote in message
news:1133247884.270535.63030@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> "(PeteCresswell)" <x@xxxxxxxxx> wrote in message
>> >
>> > Could the wind resistance of clothing really be a bigger factor
>> > than
>> > the diff
>> > between fat and skinny tires?
>>
> Yes... easily.
>
> Phil Holman wrote:
>> Air density. On cold days when more clothing is required, air density
>> is
>> increased so you get a double whammy. The ratio of air density at 30
>> deg
>> C and 0 deg C (constant pressure) is 303/273 = 1.11. If you coast at
>> 30
>> mph in a toasty 30 degrees, this will reduce to 27 mph at a chilly 0
>> degrees. IMO this is a bigger factor than the additional clothes.
>>
> The speed difference will be proportional to the square root of the
> density ratio... or in this case 1.11^.5 or 1.054. Floppy clothes
> could
> have a much larger effect. Also, the rolling resistance of tires
> increases at low temperatures, which would probably make the
> difference
> between the tires more pronounced.
>
Yes you're right but actually drag is proportional to velocity squared
so 30^2 = v^2 *1.11
v = Sqrt (900/1.11) = 28.5 mph. For me, this is more significant than
the additional layers of clothing I wear ( I don't wear one inch thick
cycling tights).
Phil H
.
- References:
- Wind Resistance, Clothing, & Low-Hanging Fruit?
- From: (PeteCresswell)
- Re: Wind Resistance, Clothing, & Low-Hanging Fruit?
- From: Phil Holman
- Re: Wind Resistance, Clothing, & Low-Hanging Fruit?
- From: Ron Ruff
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