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Push Button on Joystick Grip to Toggle Speed Brakes?

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Valin

Joined: 13 Apr 2010
Posts: 31
Location: Colorado

Posted: Sat Jun 26, 2010 1:03 pm Post subject: Push Button on Joystick Grip to Toggle Speed Brakes?

Hello,  

   

I’ve searched the archives but can’t find help on this.  I’d like to use one of my joy stick grip buttons to control the Precise Flight speed brakes.  The button is a simple push button normally open.  The Precise Flight Control Unit needs a voltage on one of two pins to control whether they are up or down.    

   

How can I use a push button to switch the voltage a between two lines?  Here’s a screen shot of my wiring diagram in work.  Note I’d also like it to work with the toggle switch on the panel.  

   

Thanks,  

   

Valin  

Lancair Legacy Project  

Texas  

   

[img]cid:image001.png(at)01CB1548.BE46A300[/img]

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bgray(at)glasair.org
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Posted: Sat Jun 26, 2010 2:13 pm Post subject: Push Button on Joystick Grip to Toggle Speed Brakes?

Forget the push button on the stick and replace it with a three position toggle ((up)-off-down). The toggle should be spring loaded to off from the up position only. Run your single point ground for the speed brakes through a two position toggle in a convenient location to control the ground for the pilot/copilot control authority.  

     

Bruce

 www.Glasair.org   

  

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Valin

Joined: 13 Apr 2010
Posts: 31
Location: Colorado

Posted: Sat Jun 26, 2010 2:27 pm Post subject: Re: Push Button on Joystick Grip to Toggle Speed Brakes?

Thanks for the advice Bruce.  I'd assume you mean replace the button switch with a toggle switch as one can on the Infinity grips.  You can't do that with the Tosten grips.  Not sure if you could see the image -- but, the Precise Flight Control Unit requires a positive voltage across either pin 6 or 7 to move the speed brakes up or down, respectively.



I'd really like to use the push button on the grip to just toggle the speed brakes up or down if it's not too complicated.  I'm hoping there's a special relay that will handle that easily...  



Anyone know of the best way to accomplish this?



Thanks again,



Valin

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bgray(at)glasair.org
Guest

Posted: Sat Jun 26, 2010 2:54 pm Post subject: Push Button on Joystick Grip to Toggle Speed Brakes?

Gosh that would be confusing to fly. That means that if you have partial

speed brakes deployed, it would take 2 button presses to go to full

deployment. You would have to watch the brakes to see which way they

moved when you pressed the button to see if another press was needed.

Not good if you're on short final. 



Does the SB control box have logic to control the end point or does it

continue power if the brakes are fully up/down?



I still thing a 3 position toggle is the only solution, unless you want

to fiddle with a button and only want full up/down on your brakes.



Bruce

www.Glasair.org 



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Valin

Joined: 13 Apr 2010
Posts: 31
Location: Colorado

Posted: Sat Jun 26, 2010 3:17 pm Post subject: Re: Push Button on Joystick Grip to Toggle Speed Brakes?

The Precise Flight Speed Brakes are either up or down -- no partial deployment.  There are lights on the panel for when they are deployed and you can hear and feel the vibration from the turbulent air.  I can see how you'd want what you described if there were an in between setting rather than just deployed or not.  



With just binary up or down, the push button toggle seems pretty simple operationally to me.



Thanks,



Valin

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bgray(at)glasair.org
Guest

Posted: Sat Jun 26, 2010 4:21 pm Post subject: Push Button on Joystick Grip to Toggle Speed Brakes?

I have the earlier model that allows partial settings. I would still go

for a pilot/copilot command switch. You don't want a passenger putting

on the brakes at the wrong time.



Bruce

www.Glasair.org 



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