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Electric Gov Setup

As there are some customers asking how to set up a eletric basically right - we want to explain some things here. Please mention that the most important setup values are "static" ones:

  • throttle endpoints (as usual)
  • basic throttle
  • collective add
  • min limit
  • runup limit
  • Auto (Bailout) throttle

That's all - and now lets walk through them ;-)

 

 

 

 

Here we have the basic diagran which shows dependencie of collective and throttle. Keep in mind that our zero degree point must not be stick center - it can be set up on the tail section e.g. for a scaleship.

Motor stop is the bottom line as you know.

 

 

 

 

 

 

 

 

 

 

 

In a flight bank we always use a 3-point v-shaped throttle curve which is determined by the named values here - if the gov is not running (e.g. disconneted rpm sensor).

 

For setting up this values we suggest to use the method for the spoolup mode above - it will give the same values and the control loop is disabled by default there.

 

 

 

 

 

 

 

In addition to the drawing above - when the governor is engaged (which means the throttle has passed min limit and a valid rpm signal is given from the sensor) - the throttle curve will be shifted completely by the integral. The goal is to get the right height for the requested headspeed. If the TC is set up too high (too much basic throttle) the rpm overshoots first and will be taken back by the integral afterwards.

 

 

 

 

 

 

Our main control loop parameter in governed operation is called the "Gain". This is a proportional gain, a short term value. Too much will get oscillating rpm effects, too low - no constasnt rpm on the rotor.

To limit the used throttle range for the gain above and beneath the throttle curve - we have the P Limiters.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Now - how to tweak them if needed - e.g. on Low RPM flying with overgeared helicopters:

  1. disconnect RPM signal wire
  2. turn the motor on
  3. Spoolup until you have zero collective
  4. measure Headspeed (external )
  5. dial basic throttle unless you got the HS for your first RPM
  6. go into a hover
  7. dial collective add unless the headspeed seems to be the same (just listen)
  8. write down values and repeat point 4-8 for every one of the max. 3 headspeeds
  9. turn the motor off
  10. dial in the values above corresponding to the target RPM and bank
  11. set min limit approx. 20 points below the lowest basic throttle - but at least 10 points
  12. stick at zero collective
  13. flip the motor switch to run
  14. if the spoolup goes too fast - lower the gov acceleration limit (default 3) to 2 or 1. But lowering this will lower also the autuortation recovery acceleration.
  15. get into a hover, switch all rpm's to try
  16. on the lowest RPM do a climbout and fast descend
  17. if the motor (not rotor) overspeeds - lower the P Lim - (unless you won't have Gov at min Limit entries. If they appear - lower min Limit). If it has too less punch on the sudden collective input - increase the value. It is better to accept a bit overspeeding than have no power ;-)
  18. test autorotation bailout - we would set the throttle for this somewhere between min Limit and off. Lets say 10-20 points less than min limit - but not below 10.

That's it!

 

Video with most known issues on the VGov: