[Milsurplus] altimeters coupled to autopilots

[Lloyd KK7IZ]

Might have been a Lear L-2 or Sperry SP-4
Thanx
Lloyd  KK7IZ
kk7iz at cox.net

Lloyd Godsey  KK7IZ
1315 N. udall Circle
Mesa, Az  85203
480-620-7145 (cell)
Visit my  web site
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www.antiqueradioarchives.com
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Collecting OLD civilian aircraft radios and literature
Particularly Lear. Got anything?
Some boatanchors got wings

----- Original Message ----- 
From: <boeing377 at aol.com>
To: <milsurplus at mailman.qth.net>
Sent: Saturday, March 25, 2006 5:36 PM
Subject: [Milsurplus] altimeters coupled to autopilots


>I worked on a tube autopilot that had an altitude hold function. It 
> just had an aneroid pressure sensing element on the autpilot chassis, 
> shock mounted to isolate it mechanically. Autopilot didnt need to know 
> altitude, just pressure and could control elevators (vertical axis) to 
> maintain a zero change in aneroid deflection. Slaving to a radio 
> altimeter would be pretty impractical as it would be essentially 
> terrain following, NOT a smooth ride unless you are over the ocean or a 
> flat landscape and serves no really useful purpose if you are above 
> minimum enroute altitude.
> 
>   
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