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External antennas on composite plane

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gmcjetpilot

Joined: 04 Nov 2006
Posts: 170

Posted: Thu Feb 14, 2008 5:13 am Post subject: External antennas on composite plane

Flat plate area of the airframe has nothing to do with it, 

speed does. The B757 and B767 is a big plane but goes 

460 kts.

   

  bent whip Com (at) 200 kts about 0.25 to 0.30 mph drag

transponder (at)  200 kts about/less than 0.10 mph drag

VOR whiskers (at) 200 kts double the Com antenna)

   

  So for all three you are looking at 1 mph at 200 kts.

   

   

  >Subject: Re: External antennas on composite plane (was Alternator article)

 	  Quote: 	
		  From: "Matt Prather" <mprather(at)spro.net>


	


 	  Quote: 	
		  Drag is a relative thing.  One or two antennas on a big 4 seater that

won't go 200kts down low is one thing.  As the airframe gets smaller

(lower airframe flat-plate area) and the speed goes up, antenna drag

becomes less trivial..  Plus,  antennas are ugly.  But, I agree that for

?most airplanes external antennas make sense unless you're looking to be
	


 	  Quote: 	
		  experimental. Regards, Matt-


	


        Be a better friend, newshound, and   [quote][b]

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mlas(at)cox.net
Guest

Posted: Thu Feb 14, 2008 6:10 am Post subject: External antennas on composite plane

460 kts TAS not indicated.  The indicated speed of a 757 or 767 is 360kias.  

   

Think about it,  

   

Mike  

   

--

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