Vibrex 2000 and Vibrex 2000 Plus User Guide 157
Appendix: Photocell Taping
This appendix helps the user determine how much retro-reflective tape
(tape width) to use with the Vibrex 2000 and Vibrex 2000 Plus systems’
photocell installations.
Tape Width Determination
The user may determine the optimum photocell tape width for the subject
aircraft in the following ways:
• Mathematical formula
• Simplified table
• Numerical graph
Mathematical Formula
Use the following formula to calculate the minimum width of retro-
reflective tape necessary:
Minimum tape width = 2.0(p)(Radius)(Rate)(0.0003)
Express the answer in inches. Use the following values and units with this
equation:
• π = 3.1416
• Radius = Distance of the tape from the center of rotation in inches
• Rate = Rotational rate in Hertz (cycles per second)
The user may determine the Hertz value by taking the revolutions per
minute (RPM) and dividing by 60. Note that this formula calculates the
minimum tape width.
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