Along those lines, didn't the U2 have something like a 50 knot(?) window
when cruising at designed altitude? Drop the speed and it stalled. Not
an easy plane to fly apparently.
Martin
-----Original Message-----
From: Jim Nichols [mailto:jhnichols@xxxxxxxxxxxxx]
Sent: Friday, August 26, 2011 1:24 AM
To: Olympus Camera Discussion
Subject: Re: [OM] Titanic, was More from the Airport
Chris,
I trying to recall something I read a number of years ago. In an upper
corner of the flight envelope, the cruise AoA can approach the stall
AoA.
Think of it this way: The aircraft weight does not change, except for
the fuel that is burned off. As you climb to jet cruising altitudes,
the air density falls rapidly, so the dynamic pressure, or "q", falls
off as well.
This means that, in order to support the weight, the wing requires
higher and higher angles of attack. When the flight AoA approaches the
stall AoA for the flight Mach number, it takes very little stick force
to get into trouble. For crews flying fly by wire systems with
computers in the loop, they very seldom experience the subtleties of
hand flying in this regime.
Loss of pitot pressure on a dark night under such conditions is a
worst-case scenario.
I've heard the term "departure" used to describe the loss of flying
ability in such cases. I think I first heard of it in reference to the
early Lear jets.
Jim Nichols
Tullahoma, TN USA
----- Original Message -----
From: "Chris Barker" <ftog@xxxxxxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Thursday, August 25, 2011 11:43 PM
Subject: Re: [OM] Titanic, was More from the Airport
> Jim
>
> It would be bad if there were no indication of AoA, but I don't know
for
> certain what they have.
>
> Chris
>
> On Thursday, 25 August 2011, Jim Nichols <jhnichols@xxxxxxxxxxxxx>
wrote:
>> Piers,
>>
>> Thanks for the link. As an aeronautical engineer with a career in
wind
>> tunnel testing, and as a civilian pilot, that was interesting
reading.
>>
>> I noted that the Company's actions did not make reference to the
>> recommendation of an AOA indication in the cockpit in view of the
pilots.
>> Some other articles I have read recently have considered this to be a
>> worthwhile addition in many aircraft. I have seen sensors on several
>> business jets, but have no idea how the data are used or displayed.
>>
> --
> _________________________________________________________________
> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
> Themed Olympus Photo Exhibition: http://www.tope.nl/
>
>
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|