posted on Dec, 14 2006 @ 10:37 AM
Originally posted by Ghost01
How dose the location of an aircraft engine inet/s really affect its stealthyness? Does it really make a signifigant difference in terms of RCS?
The placement decision depends on a whole load of things, first of which is - what is the aircraft gonna do?
High altitude penetration?
Low altitude penetration?
Need to be manouverable?
then there are other details like engine placement, weapons bay placement, engine mass flow rate, undercarriage etc etc. Everything has knock on
The B-2 was (originally) designed for high alt penetration of Soviet airspace - hence shield the inlets from the ground. Same with the F-117.
The F-22 needs to be manouverable, you need engine power at high AoA, so you need a good supply of airflow - thus get them intakes under the wings
where the air is cleanest.
Of course, with all of the above, most important thing in an inlet is not letting any radar waves get in and get out after hitting the fan face [at
least - not get out in any useful manner]. So all intake ducts are twisted/bent/whatever to ensure no clean path (i.e. without bouncing off a wall or
two) for waves (within a range of wavelengths) to the fan/compressor first row.