speed2power: For a given speed, the power necessary by a cyclist.

In Bolshom/optimumtt: A colection of functions to help cyclists.

Description

Using a given climate, bike specifications, athlete characteristics and terrain information, this function returns the power necessary to a cyclist being able to develop the input speed.

Usage

speed2power(G, W, Crr, CdA, Rho, Ldt, Vw, phi, V)

Arguments

G	Gradient of slope. It's given by the heigth of a climb divided by its distance.
W	Weigth of the system, athlete, bike, clothes and all the gearing necessary.
Crr	Coefficient of rolling resistance. The resistance of the tyres to the ground.
CdA	It's the drag coefficient of the system. Usually the range is .4 (tops) to .17 (Obree 1994)
Rho	The air density in kg/m^3.
Ldt	The percentual loss of the drivetrain. Usually ranges from 1.5~5 percent.
Vw	Wind speed in m/s.
phi	The angle at which the wind affects the cyclist.
V	The speed in km/h.

Value

power

The power, in watts, necessary to overcome the resistance, by a cyclist.

Author(s)

Natan Freitas Leite.

References

https://www.gribble.org/cycling/power_v_speed.html

Examples

## The function is currently defined as
function (G, W, Crr, CdA, Rho, Ldt, Vw, phi, V)
{
    power = (((1 - (Ldt/100))^(-1)) * f.resist(G, W, Crr, CdA,
        Rho, V, Vw, phi) * (V/3.6))
    return(power)
  }

w=65+11
cda=.3
dt=3
g=0
crr=.005
rho=1.226
vw=0
phi=0
v=30

power=speed2power(g,w,crr,cda,rho,dt,vw,phi,v)
power

Bolshom/optimumtt documentation built on May 24, 2019, 8:56 a.m.