NCLRA logo  

Line Rake Analysis

Close Menu
Home Join or Renew Contact Us Racing Suppliers Bylaws TorqueRoll Racing Rules TechTopics Helpful Programs Plans Calendar NATs Information F2C Team Selection NCLRA Awards Documents Login

For a Coefficient of Parasitic Drag: 0.010

Line sweep angle 1.69 degrees

Line sweep 0.886 inches.

Total System drag 0.74 pounds.

Line Drag 0.36 pounds is 48.5 % of total.

A/C Drag 0.38 pounds is 51.5 % of total

Weight of model in ounces: or in grams:

Wing span of model in inches:

Line diameter in inches:

Number of control lines:

Line length (handle to a/c centerline) in feet:

Wing area in sq. in.:

Lap time in seconds:

Calculations done as follows
(Corrections and improvements solicited!) 

  Rho = .002378
  Gravity = 32.17
  Mu = .000157
  E = .85
  CdPe = .01 /*Coefficient of Parasitic Drag */

  WingArea = WingArea / 144.0  /* Get wing area in sq. ft. */

  AspectRatio = ( Span**2 ) / WingArea;

  Velocity = Radius * TwoPI / LapTime  /* Velocity in ft/sec */

  CdL = 1.868 *  (Velocity * Diam / Mu)**-.232 ) *
                 (1.0 - Span * .5 / Radius)**2.768

  Drag = .5 * Rho * (Velocity**2) * WingArea * ( CdPe + ( Weight*Weight /
          ( ((.5*Rho)**2)*(Velocity**4)*(WingArea**2)*PI*AspectRatio*E)) +
        .735 * N * Radius * Diam * CdL / WingArea )

  Gamma = atan ( .686 * Rho * Gravity / Weight * N * Radius * Radius * Diam *
         ((Velocity*Diam/Mu)**-.232)* ( (1.0 - Span*.5/Radius)**2.768) ) * 57.3
 
  LineDrag = .5 * Rho * Velocity*Velocity * .735 * N * Radius * Diam * CdL;   

  LineSweep = Span * 6 * sin(Gamma/57.3)

  ACDrag = Drag - LineDrag

Back