<VV>B-58 (nova ir)- No Corvair

[James Davis]

I take issue with that.  The engines were of the same design but 
entirely different manufacture.   The fighter variant of the J-79 
used on the F-110, F-104, F-4, A-5, etc used a titanium compressor 
section and a long A/B.  The J-79-5A/B  used a stainless steel 
compressor and a short (5' 8") A/B; even the combustion and turbine 
section was different than the fighter variant . This resulted in a 
much louder and heavier engine with a higher SFC for the B-58A 
engines.  On the fighters engines, when T-2 (compressor inlet 
temperature) hit 550 C, the T-2 circuit breaker would pop removing 
all afterburner fuel; slamming the pilot and GIB against the 
instrument panels and the world got very quiet.  No such problems 
with the J-79-5.
Engine inlet unstart is always a problem with supersonic 
aircraft.  With centerline and near centerline engines unstart is a 
problem but not a panic unless you are in active combat.  On an 
aircraft with engines on the wings, an unstart is a 
disaster.  Starting with block 10 B-58A's, the  #1 and # 4 engines' 
electronic afterburner controls were wired through a P-2 pressure 
balance sensor.  If the compressor inlet pressure, varied more than 
2.5 psi the afterburner fuel was shutoff to both engines. The SR-71 
had a similar system that commanded full opposite rudder, and 
commanded a automatic inlet spike restart sequence in the event of an 
engine inlet unstart.   With the hydromechanical fuel control of the 
J-58  A/B fuel was only controlled by the pilot and engine rpm, so 
asymmetrical trust was an emergency.




At 09:12 PM 1/30/2007, AeroNed at aol.com wrote:
>
>
>BTW Interesting B-58 story told to me my a test pilot...The B-58 engines
>were the J-79, same engine as the F-4 Phantom. Anyhow, the engine was very
>advanced for it's time and experienced many teething problems. There 
>were more
>than a few B-58 incidents where one of the outboard engines would flameout
>(shutdown) and throw the airplane into a flat spin. Flying, or should I say
>riding, a supersonic frizzby must be very exciting.
>
>BTW2 Edwards uses a B-58 for target practice. No live ordnance, just
>avionics testing. It is sitting out in the desert and the thing is 
>in real bad  shape
>from vandals. Here's some picts: _http://www.b-58hustler.com/665.html_
>(http://www.b-58hustler.com/665.html)
>  ___________________________________