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Re: another plane crash ...

Dave wrote:
> 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

So, in fact, from what you're saying, the GR4s aren't actually capable
of supersonic flight, because without the variable ramps (as found on
Concorde, and the Tu144), the engines wouldn't stay running once the air
entering the intake became supersonic.

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