Copyright Velocomp LLP 2005-2015
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ON/OFF DFP(M) DISP
If you pair the Newton with a direct force power meter (DFPM), ON DFP DISP shows your
DFPM power data on the main screen of the Newton. To see your Newton data on the main
screen, click the center button, use top/bottom arrows to select OFF DFP DISP, then click
the center button to accept.
TIP:
RIDE FILE DATA FROM YOUR NEWTON AND DFPM WILL BE RECORDED, NO MATTER
WHICH SETTING YOU SELECT
COAST (Coast Down)
When you ride at high speed the effects of wind, bike aerodynamics, and riding
position become very significant. These effects are measured by aerodynamic drag,
commonly called CdA.
Your Newton accurately estimates
your CdA, based on your height, weight, and ride
position.
For 99.5% of riders, Estimated CdA provides both consistent and very accurate
results under nearly all cycling conditions
.
If you enjoy experimenting and want to learn more about measuring CdA (and, optionally,
Crr), then the coast down procedure is an advanced feature that you can try.
NOTICE:
“COAST DOWN” MEASUREMENT REQUIRES CARE AND PATIENCE. PLEASE READ
THESE INSTRUCTIONS CAREFULLY.
The coast down calibration procedure, in conjunction with ISAAC software,
measures
the
aerodynamic (and optionally, friction) drag coefficients that are particular to each cyclist,
riding position, bike type, tires, and road type. The measured drag coefficients are then
stored in your Newton profile.
The coast down procedure is this: accelerate to 20 mph (32 kph),
then stop pedaling
. Your
bike will slow due to aerodynamic and frictional drag (your bike may also slow due to the
effect of hill slope, but the Newton factors hill slope effects into its calculations). Once you
slow to 8 mph (13 kph) the coast down is complete.
For accuracy you will need to repeat the coast down 5-8 times, then analyze your results in
the ISAAC software to get the best composite measurement.
NOTE
: THE COAST DOWN MEASUREMENT WORKS VERY WELL WHEN THE PROCEDURE IS
FOLLOWED. HOWEVER, IF THE PROCEDURE IS NOT FOLLOWED EXACTLY, THEN IT IS
LIKELY THAT YOUR NEWTON WILL BE MORE POORLY CALIBRATED THAN IT WAS PRIOR TO
THE COAST DOWNS! SO, IF YOU DECIDE TO DO COAST DOWNS, PLEASE READ THESE
INSTRUCTIONS CAREFULLY AND FOLLOW THEM EXACTLY.
Here is the Coast Down procedure:
1.
Prior to doing Coast Downs you MUST use ISAAC “Device/Set Up Newton...”
to provide rider information. You MUST do a Cal Wind. And, you MUST do a
Calibration Ride.
2.
Wear the clothing, bike helmet, and shoes you’re going to use during your rides.
3.
Find a fairly level to uphill road,
with few cars, where you can coast on the road
