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Stall Horn Warning Switch

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Discover

Joined: 26 Feb 2007
Posts: 429

Posted: Sat Nov 19, 2011 12:43 pm Post subject: Stall Horn Warning Switch

Anyone have a suggestion as to how to seal the stall warning switch? I checked and mine leaks air. To me that means drag. 

So I'll have to figure out how to seal it



Here is a picture of mine

Notice all the light coming in around it in the second pic?



With camera flash on 



With camera flash off. see the light coming in?

 	  Quote: 	
		   


	


<pre><b><font size=3D2 color="#000000" face=3D"courier new,courier">

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pitts_pilot(at)bellsouth.
Guest

Posted: Sat Nov 19, 2011 2:02 pm Post subject: Stall Horn Warning Switch

Well, you could use some thin foam or some silicone.  However, do you 

really use the stall warning horn?  If you're really after getting rid 

of drag, I'd drop the switch inside and secure it in the other holes and 

then fill up the hole in the leading edge.

Just a thought.

Linn



On 11/19/2011 3:41 PM, 923te wrote:

 	  Quote: 	
		   Anyone have a suggestion as to how to seal the stall warning switch? I checked and mine leaks air. To me that means drag.

 So I'll have to figure out how to seal it



 Here is a picture of mine

 Notice all the light coming in around it in the second pic?

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Discover

Joined: 26 Feb 2007
Posts: 429

Posted: Sat Nov 19, 2011 2:09 pm Post subject: Stall Horn Warning Switch

Not being an experimental I have to keep the stall switch working in place. 

I may try the silicone or maybe a small amount of touch and foam???

I have not held and looked over the switch itself. I think the leak is outside the switch. Anyone know if the switch itself leaks air thru it?

Sent from my iPhone

On Nov 19, 2011, at 3:58 PM, Linn Walters <pitts_pilot(at)bellsouth.net> wrote:

 	  Quote: 	

 Well, you could use some thin foam or some silicone.  However, do you really use the stall warning horn?  If you're really after getting rid of drag, I'd drop the switch inside and secure it in the other holes and then fill up the hole in the leading edge.

 Just a thought.

 Linn

 On 11/19/2011 3:41 PM, 923te wrote:

> Anyone have a suggestion as to how to seal the stall warning switch? I checked and mine leaks air. To me that means drag.

> So I'll have to figure out how to seal it

> 

> Here is a picture of mine

> Notice all the light coming in around it in the second pic?

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pitts_pilot(at)bellsouth.
Guest

Posted: Sat Nov 19, 2011 5:01 pm Post subject: Stall Horn Warning Switch

On 11/19/2011 5:06 PM, 923te wrote:

 	  Quote: 	

 Not being an experimental I have to keep the stall switch working in place.

Well, only during the annual. 

And it depends on what your goal really is.

 	  Quote: 	
		   I may try the silicone or maybe a small amount of touch and foam???

 I have not held and looked over the switch itself. I think the leak is outside the switch. Anyone know if the switch itself leaks air thru it?

 From the pictures it looks like the switch rests in the black curved 

(plastic or metal?) part.  The light is leaking between the leading edge 

metal and that black plastic part.

If there is drag, as you say, with that air leakage I suspect it's down 

in the nano knot range.  You might consider leaving the stall switch 

alone 'till the last 'improvement'.  The stall switches are pretty 

pricey, I think.

Linn

 	  Quote: 	

 Sent from my iPhone

 On Nov 19, 2011, at 3:58 PM, Linn Walters<pitts_pilot(at)bellsouth.net>  wrote:

> 

>

> Well, you could use some thin foam or some silicone.  However, do you really use the stall warning horn?  If you're really after getting rid of drag, I'd drop the switch inside and secure it in the other holes and then fill up the hole in the leading edge.

> Just a thought.

> Linn

>

> On 11/19/2011 3:41 PM, 923te wrote:

>> Anyone have a suggestion as to how to seal the stall warning switch? I checked and mine leaks air. To me that means drag.

>> So I'll have to figure out how to seal it

>>

>> Here is a picture of mine

>> Notice all the light coming in around it in the second pic?

>

>

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Discover

Joined: 26 Feb 2007
Posts: 429

Posted: Sat Nov 19, 2011 5:51 pm Post subject: Stall Horn Warning Switch

There is drag at the switch, loss of work from  the air not going over the wing surface and then drag created whne the air  leaves the airframe. 

  

 It's interesting how some of the smallest  shapes of the greatest drag.

   [quote][b]

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flyv35b(at)minetfiber.com
Guest

Posted: Sat Nov 19, 2011 6:17 pm Post subject: Stall Horn Warning Switch

On 11/19/2011 5:56 PM, 923te wrote:

 	  Quote: 	
		   There is drag at the switch, loss of work from the air not going over

 the wing surface and then drag created whne the air leaves the airframe.

 It's interesting how some of the smallest shapes of the greatest drag.


	


The drag from the switch has to be very very small.  Spend your time 

working on something that could make a real difference like cooling 

drag.  Design and build a cockpit adjustable cowl flap or some other way 

to reduce cooling drag.  At cruise speed you're dragging more air 

through the engine compartment than you need, especially with cooler 

weather.

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Discover

Joined: 26 Feb 2007
Posts: 429

Posted: Sat Nov 19, 2011 6:31 pm Post subject: Stall Horn Warning Switch

I agree and have a project in mind for the winter  to try and reduce cooling drag. 

Sent from my iPhone

On Nov 19, 2011, at 8:15 PM, flyv35b <flyv35b(at)minetfiber.com> wrote:

 	  Quote: 	

 On 11/19/2011 5:56 PM, 923te wrote:

> There is drag at the switch, loss of work from the air not going over

> the wing surface and then drag created whne the air leaves the airframe.

> It's interesting how some of the smallest shapes of the greatest drag.

 The drag from the switch has to be very very small.  Spend your time working on something that could make a real difference like cooling drag.  Design and build a cockpit adjustable cowl flap or some other way to reduce cooling drag.  At cruise speed you're dragging more air through the engine compartment than you need, especially with cooler weather.

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teamgrumman(at)yahoo.com
Guest

Posted: Sun Nov 20, 2011 10:25 am Post subject: Stall Horn Warning Switch

once the inside of the wing section gets pressurized, it will push back as if it were sealed.

RTV?

       From: 923te <923te(at)att.net>

 To: Team Grumman <teamgrumman-list(at)matronics.com> 

 Sent: Saturday, November 19, 2011 12:41 PM

 Subject: TeamGrumman-List: Stall Horn Warning Switch

  

 Anyone have a suggestion as to how to seal the stall warning switch? I checked and mine leaks air. To me that means drag. 

So I'll have to figure out how to seal it



Here is a picture of mine

Notice all the light coming in around it in the second pic?



With camera flash on 

[img]cid:1.1688387226(at)web114610.mail.gq1.yahoo.com[/img]

With camera flash off. see the light coming in?

[img]cid:2.1688387226(at)web114610.mail.gq1.yahoo.com[/img]



 	  Quote: 	
		   


	


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