iBike iAero Generation III, Справочное руководство

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Copyright Velocomp LLP 2008-2010
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TIME ADVANTAGE
Time Advantage™ is another feature exclusive to the iAero/DFPM combination.
What is Time Advantage?
When you ride a bike, most of the time you’re riding in your “normal” position.
DEFINITION : YOUR “NORMAL RIDING POSITION” IS THE POSITION YOU USED WHEN
PERFORMING THE CALIBRATION RIDE WITH YOUR DFPM.
As long as you stay in your normal riding position, the relative amount of time it takes to
complete your training ride is unaffected by your riding position; that is, your “normal”
riding position gives a “normal” training time.
Now, suppose you’re on a ride and you have deviated from your normal riding position for
a portion of your ride, say, going into a tuck. Did going into a tuck save you time
compared to staying in your normal riding position? Clearly, the answer is “yes”, but
how
much time did you save ?
Here’s another situation: you attacked a hill and stood up to get more power. You know
that “standing up” is less aerodynamically efficient and costs you some time.
How much
extra time did it take to climb the hill due to aerodynamic inefficiencies?
A final situation: you’ve perfected your “normal” ride position using the iAero. During a
long ride, however, you get tired and your ride position becomes a bit sloppy.
How much
longer did it take you to complete your ride because your ride position became worse?
Time Advantage answers all these questions, and more.
DEFINITION : AT ANY POINT OF YOUR RIDE, “TIME ADVANTAGE” IS THE CUMULATIVE
AMOUNT OF TIME YOU HAVE GAINED (OR LOST) UP TO THAT POINT, DUE TO DEVIATIONS
FROM YOUR NORMAL RIDE POSITION.
Time advantage is measured in seconds. Suppose you look at your iAero at mile 6.2 of
your ride and Time Advantage reads a positive 30. Then, up to that point of your ride you
have
gained 30 seconds of time, relative to your “normal” riding time , as a consequence of
moment-to-moment improvements of your normal riding position. If, instead, your Time
Advantage reads -15 then you’ve
lost fifteen seconds compared to staying in your normal
riding position.
How are Continuous CdA and Time Advantage related?
If your current value CdA is higher than your baseline CdA then you are relatively less
aerodynamically efficient compared to your normal riding position and, for the same
amount of applied force, you won’t go as fast. Conversely, if your current CdA is lower
than your normal value then you are MORE aerodynamic and you’ll go faster compared to
your normal riding position.
The iAero compares your Continuous CdA to your baseline CdA, moment-by-moment.
Using the comparative CdA values between your baseline CdA and your Continuous CdA,