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Re: another plane crash ...

Brian Morrison wrote:
> On Fri, 03 Jul 2009 22:12:44 +0100
> Dave <davenpat@btopenworld.com> wrote:
>
>> nntp@benison.co.uk wrote:
>>> On Fri, 03 Jul 2009 14:56:03 +0100, Brian Morrison
<scrapspam@fenrir.org.uk>
>>> wrote:
>>>
>>>> Which has been known to work against them, even in a Tornado GR1.
>>> Or should that be especially in a GR1.  Never played with the GR4 though!
>> GR4's were limmited to subsonic speeds after MLU.
>
> Er, why?
>
The reason that a Tornado could reach Mach 2 was down to the variable
geometry ramps at the front of the intakes. At speed, the ramps would
come down from the top of the intake to prevent (I can't remember the
terminology).


I have remembered now, it is the shock wave of the air from going too
far down the intake.

Basically it was to prevent too much air punching down towards the
engines and blowing out the flame. There used to be an AICS (air intake
control system) that controlled the angle of the ramp according to the
A/C air speed. There is a vent about 2 or 3 foot behing the front of the
intake on top. This was there to balance the pito static system that the
computers used.

At the sides of the intake were spring loaded inlet vents that allowed
extra air to go into the intakes.

The above is a very scant description of how it worked

Before MLU the RAF decided that they didn't need supersonic flight from
the GR1's and it was decided to take out all of the AICS systems. This
left space for other things to go into the avionic bays for GR4 enhancement.

The ramps were controled by a hydraulic actuator and they were removed
and replaced by an adjustable strut that was set once only.

F3's were not affected.

HTH

Dave

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