2/11/2024 0 Comments F4 phantom cockpit weapons officerI suspect these BL control plates could then move to vary the intake-throath ratio. The reader speaks of "splitter vari-ramps" and says that "later F4 had active ramps". Of course, a vortex generator to keep the engine well fed at high AOA. It was not present on the prototype, and it looks extremely similar to the one seen on the unlucky CF105 Arrow. On the lower part of the control plate, a triangular extension can be seen. I have no info on wether there was also some other form of boundary layer control, such as aspiration. It probably caused a Cd increase in exchange for improved engine efficiency. This plate was obviously there to start a new, thin boundary layer at a short distance from the intake, avoiding the ingestion of the thick layer developing from the nosecone. Even Mig 21 had a variable geometry intake, thanks to a sliding nosecone.Ģ) A big boundary layer control plate. I found no specific info on the internal working of F4 intakes, so I wonder : had they some movable parts I'm not aware of ? Fixed geometry seems strange for such a sophisticated aircraft. Only, F15 air intakes had variable geometry, while it appears F4 ones were fixed. Probably they were 2D shock diffusers, the same principle used in F15 Eagle. These intakes have two features that strike the eye at first :ġ) no shock cone : something very different from, say, contemporary F104 or Mirage. There are many aerodynamicists here, and I think it's an interesting subject. He asked some info about the peculiar air intakes of that plane. I received a letter from a Forum reader who was lucky enough to be a F4 pilot.
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