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Coolie Hat Switch
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kuffel(at)cyberport.net
Guest

Posted: Tue Mar 13, 2012 3:58 pm Post subject: Coolie Hat Switch

Bob,

  

 <<   voltage to the trim system to 1.25 volts. If  the

motor will definitely not run at any speed under any load at

this  voltage, then this shutdown philosophy would work.



Anybody got a  Ray-Allen actuator laying around? .. tell us what you see    >>

  

 At no load my Ray Allen motor starts around 3+  volts and then continues to run until the voltage is reduced to 2.5  volts.

  

 Hope this helps.  The time constant I used on  my controller is 1.5 sec.  The 3 sec supplied on some commercial  controllers is too long.  At 12 volts the lock to lock time for RAC motors  is about 6 seconds.  So 3 sec can give you full travel from  mid-location.

  

 Tom Kuffel

   [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Mar 13, 2012 4:24 pm Post subject: Coolie Hat Switch

 	  Quote: 	
		  

 At no load my Ray Allen motor starts around 3+ volts and then continues to run until the voltage is reduced to 2.5 volts. 	


   Good data sir. Thanks! 

  	  Quote: 	
		   

 Hope this helps.  The time constant I used on my controller is 1.5 sec.  The 3 sec supplied on some commercial controllers is too long.  At 12 volts the lock to lock time for RAC motors is about 6 seconds.  So 3 sec can give you full travel from mid-location. 	


   Yeah . . . I would hope that most users

   find that something like 10-15 seconds

   for full stroke at cruise trim suggests

   a 2 second run-time limit for keeping a runaway

   bounded. It's probably not so critical during

   approach to landing where the trim needs to

   run perhaps twice as fast. On a Learjet the

   speed ratio between cruise and approach is

   1:4.



   If the speeds are set for useful/comfortable

   rates in both modes of flight, then

   a stuck command isn't going to produce a

   startling event. If the mechanical limits and

   trim control authorities are well crafted, there's

   no risk for having a trim system stuck in a stop.

   I think I'm going to leave the run-time limit

   feature off.



   Thanks for the feedback.



 

   Bob . . .    [quote][b]

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