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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Nov 18, 2011 8:27 am Post subject: antenna connections

 	  Quote: 	
		  

Is there anything different about this type of antenna compared to 

the one I'd suggested, outside of a streamlined base?


	


   Probably. I didn't intend to suggest that antennas

   made from aluminum are not practical. When you have

   the engineering and purchasing options to optimize a

   design to its intended purpose, then the product can

   be pretty finely tuned with respect to trade-offs.



   Metals are finicky things. A perfectly robust piece

   of metal can become very fragile when scratched. Cutting

   threads on a rod might be called "very deep scratches."

   Disruptions of an otherwise smooth surface become local

   stress risers that predict where a crack will start.

   I'm not a processes and materials guy so my working

   knowledge is limited to what 'rubbed off' while working

   around folks who really good at it.



   Given that I have no control over materials, processes and

   target airframes, my recommendations have to be as

   goof-proof as I can imagine. As long as your airplane isn't

   a pusher, then there's no risk to the airframe for shedding

   an antenna. If you're interested in crafting a recipe for

   success and find the risks acceptable, then give it a try.





   Bob . . .

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messydeer

Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA

Posted: Fri Nov 18, 2011 9:02 am Post subject: Re: antenna connections

Interesting. How wide and thick is this spiral wrap? What is the gap between one wrap and the next? And why don't we see this feature in airplane antennas? Where weight is the devil, seems saving an ounce would make it attractive to antenna makers.

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_________________
Dan

LynnCole(at)foxvalley.net
Guest

Posted: Fri Nov 18, 2011 12:31 pm Post subject: antenna connections

The antenna, itself tapers from about 0.175" at the base to about 0.100" at the tip.  The wrap is quite thin - about 0.005-0.008" diameter, and the pitch of the spiral is about 1 inch.  The wrap is solidly bonded to the antenna for its entire length.  I suspect that it adds some drag to the antenna, but in the car the added drag would be very minor compared to the overall drag of the vehicle.  It's a good question as to why we don't see such a wrap on aircraft antennae.

 Lynn Cole

LynnCole(at)foxvalley.net (LynnCole(at)foxvalley.net)

 



On Nov 18, 2011, at 11:02 AM, messydeer wrote:

[quote]--> AeroElectric-List message posted by: "messydeer" <messydeer(at)yahoo.com (messydeer(at)yahoo.com)>

Interesting. How wide and thick is this spiral wrap? What is the gap between one wrap and the next? And why don't we see this feature in airplane antennas? Where weight is the devil, seems saving an ounce would make it attractive to antenna makers.

--------

Dan

Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=358381#358381





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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Nov 18, 2011 4:19 pm Post subject: antenna connections

At 11:02 AM 11/18/2011, you wrote:

 	  Quote: 	
		  



Interesting. How wide and thick is this spiral wrap? What is the gap 

between one wrap and the next? And why don't we see this feature in 

airplane antennas? Where weight is the devil, seems saving an ounce 

would make it attractive to antenna makers.


	


    Adding the wrap is another process that adds to

    cost of the finished product. If you can make the

    critter survive without it, then perhaps you're

    a few shekels ahead in the game. Then too, that

    fix applies only to the phenomenon identified

    as vortex shedding. There's turbulence in the

    air behind a propeller that supplies yet another

    vibration input.

   Bob . . .

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Fri Nov 18, 2011 4:19 pm Post subject: antenna connections

Several aviation antennae are actually embedded in fibreglass forms so you actually don’t see any of the actual antenna.  On some composite planes the antennae are built in to either the wings or the tail leaving nothing exposed at all.  Having worked with Scaled Composites, Bob must have a wealth of experience in that field..

 

Noel

 

From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Lynn Cole

Sent: November 18, 2011 4:57 PM

To: aeroelectric-list(at)matronics.com

Subject: Re: Re: antenna connections

 

The antenna, itself tapers from about 0.175" at the base to about 0.100" at the tip.  The wrap is quite thin - about 0.005-0.008" diameter, and the pitch of the spiral is about 1 inch.  The wrap is solidly bonded to the antenna for its entire length.  I suspect that it adds some drag to the antenna, but in the car the added drag would be very minor compared to the overall drag of the vehicle.  It's a good question as to why we don't see such a wrap on aircraft antennae.

 

Lynn Cole



LynnCole(at)foxvalley.net (LynnCole(at)foxvalley.net)



 



 



 

On Nov 18, 2011, at 11:02 AM, messydeer wrote:





--> AeroElectric-List message posted by: "messydeer" <messydeer(at)yahoo.com (messydeer(at)yahoo.com)>



 



Interesting. How wide and thick is this spiral wrap? What is the gap between one wrap and the next? And why don't we see this feature in airplane antennas? Where weight is the devil, seems saving an ounce would make it attractive to antenna makers.



 



--------



Dan



 



 



 



 



Read this topic online here:



 



http://forums.matronics.com/viewtopic.php?p=358381#358381



 



 



 



 



 



 



 



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  the Contribution link below to find out more about



  this year's Terrific Free Incentive Gifts provided



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www.buildersbooks.com



www.homebuilthelp.com



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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Nov 18, 2011 4:29 pm Post subject: antenna connections

At 02:26 PM 11/18/2011, you wrote:

 	  Quote: 	
		  The antenna, itself tapers from about 0.175" at the base to about 

0.100" at the tip.  The wrap is quite thin - about 0.005-0.008" 

diameter, and the pitch of the spiral is about 1 inch.  The wrap is 

solidly bonded to the antenna for its entire length.  I suspect that 

it adds some drag to the antenna, but in the car the added drag 

would be very minor compared to the overall drag of the 

vehicle.  It's a good question as to why we don't see such a wrap on 

aircraft antennae.


	


    It's possible that the wrap we see on car antennas

    has two purposes. The first being aerodynamic as

    previously explored. The second may be that the wrap

    is also a metallic conductor that serves as

    the antenna supported on a Fiberglas rod.

   Bob . . .

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LynnCole(at)foxvalley.net
Guest

Posted: Sat Nov 19, 2011 9:02 am Post subject: antenna connections

A magnet sticks to the shaft of my car's antenna.  Your idea of a metallic wrap on a fiberglass rod might save a little weight in an airplane.

 Lynn Cole

LynnCole(at)foxvalley.net (LynnCole(at)foxvalley.net)

 



On Nov 18, 2011, at 6:26 PM, Robert L. Nuckolls, III wrote:

[quote]--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>

At 02:26 PM 11/18/2011, you wrote:

  	  Quote: 	
		  The antenna, itself tapers from about 0.175" at the base to about 0.100" at the tip.  The wrap is quite thin - about 0.005-0.008" diameter, and the pitch of the spiral is about 1 inch.  The wrap is solidly bonded to the antenna for its entire length.  I suspect that it adds some drag to the antenna, but in the car the added drag would be very minor compared to the overall drag of the vehicle.  It's a good question as to why we don't see such a wrap on aircraft antennae.

 	




   It's possible that the wrap we see on car antennas

   has two purposes. The first being aerodynamic as

   previously explored. The second may be that the wrap

   is also a metallic conductor that serves as

   the antenna supported on a Fiberglas rod.





  Bob . . . 

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  November is the Annual List Fund Raiser.  Click on

  the Contribution link below to find out more about

  this year's Terrific Free Incentive Gifts provided

  by:

* AeroElectric www.aeroelectric.com

* The Builder's Bookstore www.buildersbooks.com

* HomebuiltHELP www.homebuilthelp.com

  List Contribution Web Site:

--> http://www.matronics.com/contribution

Thank you for your generous support!

                              -Matt Dralle, List Admin.

          - The AeroElectric-List Email Forum -

  --> http://www.matronics.com/Navigator?AeroElectric-List

              - MATRONICS WEB FORUMS -

--> http://forums.matronics.com

            - List Contribution Web Site -

Thank you for your generous support!

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  --> http://www.matronics.com/contribution

 [b]

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