Capstan Calibration Chart (with Pressure Drop)

Written by

Tom Wolf

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Key takeaways
  • PWM flow control enables about fivefold travel speed change without altering spray pressure.
  • The chart shows which nozzle flow rates to use for given settings.
  • Add the significant Capstan solenoid pressure drop to cab spray pressure calculations.
  • See Capstan Tip Chart (with Pressure Drop) PDF or Capstan-Pressure-Drop-US-units-1 download for details.

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Pulse-width Modulated flow control allows you to change travel speed by a factor of about five without a change in spray pressure.  This chart shows which nozzle flow rates to use. Note the significant pressure drop across the Capstan solenoid.  This value must be added to the cab spray pressure, as explained here.

Capstan Tip Chart (with Pressure Drop).pdf

Capstan-Pressure-Drop-US-units-1Download

About the Author

Tom Wolf

Tom Wolf is based in Saskatoon, SK and has 35 years research experience in the spraying business. He obtained his BSA (1987) and M.Sc. (1991) in Plant Science at the University of Manitoba, and his Ph.D. (1996) in Agronomy from the Ohio State University. Tom focuses on practical advice that is research-based to improve the efficiency of producers.

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Reference
Wolf, Tom. (2015). Capstan Calibration Chart (with Pressure Drop). Sprayers 101. https://sprayers101.com/capstan-chart/ (Accessed on April 14, 2026 at 22:35)
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