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Old April 7th 21, 11:58 PM posted to rec.bicycles.tech
John B.[_3_]
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Default More Crazy data

On Wed, 7 Apr 2021 11:26:06 -0400, Frank Krygowski
wrote:

On 4/7/2021 10:35 AM, Tom Kunich wrote:


The one problem with barometric altimeters is there can be two sources of errors: 1. When a front moves through the barometric pressure changes and you can show errors. 2. As you point out the sampling rate is important for accuracy. Usually not for absolute altitude for which they are surprisingly accurate (Over the years I've had perhaps a dozen different barometric pressure altimeters and they are all in very close agreement.) but the sampling rate really does screw up the rate-of-climb or grade calculations.


I'm not much into riding data. But long ago, I was given a Nike watch
(Lance Armstrong model) with a barometric altimeter and electronic
compass. I had some fun with it, but it lost its mind after a few years.
The altimeter began acting as if I were riding upward in a hot air
balloon. Several attempts at disassembly yielded no fix. It now sits in
my workshop hoping for a miracle.


A barometric altimeter depends on the density of the air to calculate
altitude above some base and will even change the altitude reading as
the day warms up, i.e. the density of the air is reduced. Which is
why, in the days of barometric altimeters in aircraft part of the
before landing routine was to set the altimeter according to
information received from the control tower.

Air density was also used to calculate maximum take off weight and
even max horsepower for reciep engines :-)
--
Cheers,

John B.

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