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Pitot pressure switch

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tomcostanza

Joined: 19 Oct 2008
Posts: 49

Posted: Mon Sep 27, 2010 3:37 pm Post subject: Pitot pressure switch

Does anyone know a source for a pressure switch I can put in the pitot/static system.  I'd like to disable the flaps-down function if the airspeed is above some reasonable value.  I can find electronic sensors, but I'd like to eliminate any electronics for simplicity.



Thanks,

-Tom

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_________________
Clear Skies,
Tom Costanza
-- in year 17 of a 3 year project

nuckolls.bob(at)aeroelect
Guest

Posted: Mon Sep 27, 2010 5:24 pm Post subject: Pitot pressure switch

At 06:37 PM 9/27/2010, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "tomcostanza" <Tom(at)CostanzaAndAssociates.com>



 Does anyone know a source for a pressure switch I can put in the pitot/static system.  I'd like to disable the flaps-down function if the airspeed is above some reasonable value.  I can find electronic sensors, but I'd like to eliminate any electronics for simplicity. 	


    Take a look at these.



  http://www.omega.com/Pressure/pdf/PSW21_PSW22.pdf



 They're available directly from Omega.



  http://www.omega.com/ppt/pptsc.asp?ref=PSW21_PSW22&nav=preh02

 

 There's some on ebay right now . . .



  http://tinyurl.com/3yww3qx 



 

   Bob . . .    [quote][b]

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JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Tue Sep 28, 2010 2:25 am Post subject: Pitot pressure switch

Hi Tom



Is this what you are looking for:



http://www.tcwtech.com/usw-1.HTM



Regards



John

---

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johnciolino(at)comcast.ne
Guest

Posted: Tue Sep 28, 2010 4:37 am Post subject: Pitot pressure switch

Check www.aircraftextras.com.  They have the switch you need.



John Ciolino



--

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user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Tue Sep 28, 2010 4:55 am Post subject: Re: Pitot pressure switch

I suggest that an override switch be wired in parallel with the pressure switch, in case the pressure switch fails open.

  An alternative to disabling the flaps would be an alarm that would sound if the flaps were lowered while above a certain speed.  The pilot would hear the alarm as soon as the flaps started going down and she would let go of the switch before the flaps lowered enough to cause damage. (unless she is blonde)    

Joe

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Joe Gores

user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Tue Sep 28, 2010 5:40 am Post subject: Re: Pitot pressure switch

Kevin Horton made a spreadsheet that converts airspeed to pressure.  This might help deciding which pressure switch to buy.

www.tcwtech.com/airspeed%20conversion.xls

Joe

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Joe Gores

sprocket(at)vx-aviation.c
Guest

Posted: Tue Sep 28, 2010 5:40 am Post subject: Pitot pressure switch

I agree.  In my opinion, you should always have direct pilot control coupled 

with an independent warning system.   Automatic systems are like 

bureaucracies:  They can be expensive, frustrating to get working and prone 

to failure when you need them the most!

Vern

--------------------------------------------------

From: "user9253" <fran4sew(at)banyanol.com>

Sent: Tuesday, September 28, 2010 5:55 AM

To: <aeroelectric-list(at)matronics.com>

Subject: Re: Pitot pressure switch



 	  Quote: 	
		   

 <fran4sew(at)banyanol.com>



 I suggest that an override switch be wired in parallel with the pressure 

 switch, in case the pressure switch fails open.

  An alternative to disabling the flaps would be an alarm that would sound 

 if the flaps were lowered while above a certain speed.  The pilot would 

 hear the alarm as soon as the flaps started going down and she would let 

 go of the switch before the flaps lowered enough to cause damage. (unless 

 she is blonde)   

 Joe



 --------

 Joe Gores





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=313985#313985






	


 	  Quote: 	
		  

 Checked by AVG - www.avg.com

 17:56:00

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peter(at)sportingaero.com
Guest

Posted: Tue Sep 28, 2010 12:38 pm Post subject: Pitot pressure switch

I'd suggest the switch from TCW also - but be careful how you wire 

it.  Think about the scenarios when you would want it to work and when 

not, and then figure out the wiring. An over-ride switch also sounds 

sensible.



Peter



On 28/09/2010 00:37, tomcostanza wrote:

 	  Quote: 	
		   



 Does anyone know a source for a pressure switch I can put in the pitot/static system.  I'd like to disable the flaps-down function if the airspeed is above some reasonable value.  I can find electronic sensors, but I'd like to eliminate any electronics for simplicity.



 Thanks,

 -Tom



 --------

 Clear Skies,

 Tom Costanza





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=313929#313929

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Sep 28, 2010 1:58 pm Post subject: Pitot pressure switch

At 07:55 AM 9/28/2010, you wrote:

 	  Quote: 	
		  



I suggest that an override switch be wired in parallel with the 

pressure switch, in case the pressure switch fails open.

   An alternative to disabling the flaps would be an alarm that 

 would sound if the flaps were lowered while above a certain 

 speed.  The pilot would hear the alarm as soon as the flaps started 

 going down and she would let go of the switch before the flaps 

 lowered enough to cause damage. (unless she is blonde)   


	


    I'll second that suggestion. Keep in mind too

    that any time you add complexity to any system,

    the parts counts go up and failure modes expand,

    probability for failure goes up.



    If it's your CD player or cabin air conditioning

    system, perhaps not a big concern . . . but hooking

    motors to flight control surfaces is IS a BIG

    concern.



    One is well advised to consider return on

    investment for adding complexity. Does it really

    ADD to safety? Does it add a bunch of convenience

    that helps you be a better pilot while adding little

    or no risk? Consider the potential risks for handing

    off legacy pilot duties to modern conveniences.



    Finally, when such systems are added, make sure that

    NO failure will produce a hazardous, un-commanded motion

    of the surface and NO failure can produce a hazardous

    failure-to-move the surface as needed.



    My all time favorite flap system was actuated by

    a handle that was pulled up off the floor. Nothing

    happened until I was ready for it to happen . . .

    and risk of the flaps not being available as

    needed was exceedingly low.

   Bob . . .

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