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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!pesnta!hplabsc!dsmith
From: dsmith@hplabsc.UUCP (David Smith)
Newsgroups: net.aviation
Subject: Re: Orphaned Response
Message-ID: <2349@hplabsc.UUCP>
Date: Mon, 21-Jan-85 18:09:14 EST
Article-I.D.: hplabsc.2349
Posted: Mon Jan 21 18:09:14 1985
Date-Received: Wed, 23-Jan-85 04:49:13 EST
References: <2@pbear.UUCP>
Organization: Hewlett Packard Labs, Palo Alto CA
Lines: 47

>/* Written 12:15 am  Jan 11, 1985 by hplabsc!dsmith in pbear:net.aviation */
>>So why is the X-29 any worse than the F-16?  The F-16 uses a force
>>stick to electronically signal desired control surface movements.
>>(Actually, it's a little fancier than that.  I read that horizontal
>>stick force does not signal aileron deflection, but roll rate.)
>>
>>And if a hydraulically actuated B-52 lost its electronics to EMP,
>>how would it navigate home?
>>
>>I don't know how susceptible our planes are to EMP, but the Air
>>Force does test them for it.
>
>	In order to increase roll rate, aileron/spoiler deflection MUST
>increase. therefore horizontal stick force does signal aileron deflection.

There's inertia in there, too.  Let the pilot hold full left stick force
for a fast left roll.  Then he lets go of the stick.  The electronics will
deflect the ailerons in the right-roll sense to get the roll stopped fast.


>
>	If a B-52 lost its electonics, the crew would pull out their
>equivilant of the world Jeppesen manuals and fly by the compass an gyro
>compass. So they may be off by 30 - 40 miles by the time they get back, but
>at least they would be in the ball park.

Good luck with the compass in the arctic.


>
>	The airforce may test for EMP, but I don't think that they can mimic
>the incredible potentials that would exist from and actual EMP, so the
>testing can't make it perfect or guarentee it, but just give an accurate
>probability of survival/failure.
>
>						Peter Barada
>						ima!pbear!peterb

A couple of years ago, Aviation Week had a cover picture of a B-52 sitting
on top of a huge wooden tower, surrounded by power lines for EMP testing.
They were going for whole-plane testing in fields comparable to nukes
exploding nearby.  I have no other information (such as whether it
passed, or just how representative the fields were).


				David Smith
				hplabs!dsmith