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Speed Brake Switch

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jkhults(at)verizon.net
Guest

Posted: Sun Jun 15, 2008 10:04 am Post subject: Speed Brake Switch

Bob & All,

  

 I have a 4-way momentary "China hat" switch on  my Infinity Aerospace throttle handle that I want to use for flaps (up &  down) and speed brakes (fwd & aft).  The Precise Flight speed brakes  require an ON-OFF switch because once power is removed, they will  close.

  

 Let me preface my question with the fact the  electricity is "not my area"!  My question is how do I use the MOM switch  to provide continuous voltage to the speed brake asymmetry module to keep them  extended?  Does it require a relay or some other electrical  equipment?  Or should I just use an ON-OFF switch somewhere  else?

  

 Thanks,

 Jon Hults

 Lancair Legacy

   [quote][b]

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jskiba(at)icosa.net
Guest

Posted: Sun Jun 15, 2008 11:04 am Post subject: Speed Brake Switch

How about a Flip Flop Circuit?  

Something like:  

http://ourworld.compuserve.com/homepages/Bill_Bowden/page9.htm  

   

see the section for:  

“CMOS Toggle Flip Flop Using Push Button”  

   

You would have to build the circuit.  

Hoe that helps   

Jeff.  

       

Sent: Sunday, June 15, 2008 1:00 PM

 Subject: Speed Brake Switch  

  

  

     

Bob & All,  

    

   

    

I have a 4-way momentary "China hat" switch on my Infinity Aerospace throttle handle that I want to use for flaps (up & down) and speed brakes (fwd & aft).  The Precise Flight speed brakes require an ON-OFF switch because once power is removed, they will close.  

    

   

    

Let me preface my question with the fact the electricity is "not my area"!  My question is how do I use the MOM switch to provide continuous voltage to the speed brake asymmetry module to keep them extended?  Does it require a relay or some other electrical equipment?  Or should I just use an ON-OFF switch somewhere else?  

    

   

    

Thanks,  

    

Jon Hults  

    

Lancair Legacy  

  [quote] [b]

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bobf(at)feldtman.com
Guest

Posted: Sun Jun 15, 2008 12:54 pm Post subject: Speed Brake Switch

aare the speed brakes on the wings? or on the fuselage (like a cozy or Long EZ)? If on the wings, you'd need to have huge concern about potential assymetric drag if one side has voltage failure and the other doesn't, could flip inverted if the drag was serious enough on the wing.

 

if it is non-asymmetric, then disregard the above safety concern..



bobf



On Sun, Jun 15, 2008 at 12:59 PM, Jon Hults <jkhults(at)verizon.net (jkhults(at)verizon.net)> wrote:

 [quote]       Bob & All,

  

 I have a 4-way momentary "China hat" switch on  my Infinity Aerospace throttle handle that I want to use for flaps (up &  down) and speed brakes (fwd & aft).  The Precise Flight speed brakes  require an ON-OFF switch because once power is removed, they will  close.

  

 Let me preface my question with the fact the  electricity is "not my area"!  My question is how do I use the MOM switch  to provide continuous voltage to the speed brake asymmetry module to keep them  extended?  Does it require a relay or some other electrical  equipment?  Or should I just use an ON-OFF switch somewhere  else?

  

 Thanks,

 Jon Hults

 Lancair Legacy

    	  Quote: 	
		  

	


[b]

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Bob McC

Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON

Posted: Sun Jun 15, 2008 7:52 pm Post subject: Speed Brake Switch

John;

  

 Assuming you wish to use one  momentary switch to turn "ON" the circuit and another (opposite side of the  "China Hat") to turn "OFF" the circuit, two SPDT relays will do the trick. See  attached word document. Please excuse the rudimentary sketch. The quadruple  ovals represent the relay coils. The diode is to protect the switch from the  load current. (assuming the list accepts the attachment)

  

 Bob McC

 [quote]   ---

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Bi-stable_momentary_P-B_relay_circuit.doc

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_________________
Bob McC
Falco #908
(just starting)

mlas(at)cox.net
Guest

Posted: Mon Jun 16, 2008 6:48 am Post subject: Speed Brake Switch

Jon,  

   

With the Precise Flight speed brakes you have two switches.  The first is the main power switch that provides power to the controller.  The second switch is the control switch which controls the operation of the speed brake.  The first switch is used for removing power from the system altogether.  When power is removed the speed brakes go into failsafe which is a hard retract.  The control switch works through the computer controller and controls the rate of extension and retraction while providing asymmetry protection during operation.  Look at the schematic provided and put together list a of questions from that.  The wiring that Precise provides is not very clear.  The units were original designed for an engineered installation on certified aircraft and the drawings have not been updated for the typical homebuilt installation.  

   

   

   

Here is the response from a post that I made down thread: I used a three position switch for the speed brakes on my Legacy.  Center off, momentary on, switched on.  That way you can have the best of both worlds.  The one word of caution is to have a power switch separate from the control switch.  Sometimes switches get hit on the stick unintentionally.  You would not want the speed brakes to come out during take off and in my experience you wouldn’t notice right away.  

   

Regards,  

   

Mike Larkin  

   

Legacy dude  

   

--

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Speedy11(at)aol.com
Guest

Posted: Mon Jun 16, 2008 10:50 am Post subject: Speed Brake Switch

John,

 If you contact JD at Inifinity Aerospace he can tell you how to do  it.  I think he has an optional switch you could install in place of the  original coolie hat switch that will do what you want.

 Stan Sutterfield

  

  	  Quote: 	
		  I have a    4-way momentary "China hat" switch on my Infinity Aerospace 

throttle    handle that I want to use for flaps (up & down) and speed 

brakes (fwd    & aft).  The Precise Flight speed brakes require an ON-OFF 

switch    because once power is removed, they will close.



Let me preface my    question with the fact the electricity is "not my 

area"!  My question    is how do I use the MOM switch to provide continuous 

voltage to the speed    brake asymmetry module to keep them extended?  Does 

it require a    relay or some other electrical equipment?  Or should I just 

use an    ON-OFF switch somewhere else?



Thanks,

Jon Hults

Lancair    Legacy 	


 

  



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  [quote][b]

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