Re: Navy Phantom Engine Question

Blinky the Shark <no.spam@xxxxxxxxxxx> wrote:

Aingon Atelia wrote:
"WaltBJ" <waltbj01@xxxxxxxxxxxxxx> wrote:


Andy Bush wrote:
It is a feature of all F-4s and is designed to control the
supersonic flow of air into the intake. The 'flat plate'
(variable ramp duct) is hinged to flex away from the fuselage
as the jet moves towards supersonic speeds. This acts as a
barrier to the incoming air and deflects the supersonic shock
wave outside of the intake lip thereby allowing only subsonic
air to enter. If the 'splitter plate' did not do this, then
the shock wave would enter the intake throat and potentially
cause engine disruptions (compressor stalls).
SNIP: The plate is hinged towards the front, at the middle,
and the rear. At about M 1.4 (depending on temp aloft) it will
slowly move the center fold out to close down the intake as
required to control air flow into the compressor and prevent
supersonic flow into it. If it does not program, thye crew
will soon experience a hefty compressor stall (loud bang)
which is attention-getting on a maintenance test hop for an
engine change. Walt BJ

A nice set of pics, here:

http://tinyurl.com/ho4za

Good closeups. I didn't realize it was only the rear part that
moved (according to a caption there).

Hard to tell from those pics where the drive is, althugh it does
read as though it's at the rear, inside the intake.




--
Aingon Atelia
IAingonAtelia@xxxxxxxxxxxxx
Poke out my left I to reply
.

Relevant Pages

  • Re: Navy Phantom Engine Question
    ... It is a feature of all F-4s and is designed to control the supersonic flow ... of air into the intake. ... outside of the intake lip thereby allowing only subsonic air to enter. ... you can see pictures of a flat plate right at the inlet to ...
    (rec.aviation.military)
  • Re: Navy Phantom Engine Question
    ... supersonic flow of air into the intake. ... The 'flat plate' (variable ... air flow into the compressor and prevent supersonic flow into it. ...
    (rec.aviation.military)
  • Re: Navy Phantom Engine Question
    ... supersonic flow of air into the intake. ... The 'flat plate' ...
    (rec.aviation.military)
  • Re: Navy Phantom Engine Question
    ... of air into the intake. ... The 'flat plate' is hinged to ... outside of the intake lip thereby allowing only subsonic air to enter. ... intake throat and potentially cause engine disruptions (compressor stalls). ...
    (rec.aviation.military)
  • Re: Installed Cold Air Intake
    ... --Problems with mass air flow sensor due to dirt passing through K&N ... filter is treated with. ... intake ducting for dust. ... not a bottleneck unless major modifications are made to the engine. ...
    (rec.autos.tech)