I
stumbled onto a brief but very interesting
test on the basic F-104A airplane, even
though the Starfighter had completed testing
well before.
Somehow
the Test Pilot School had proposed to Lockheed
adding a pair of strakes on standard F-104s,
then in service around the world. The
school was by no means an authorized path
for such modifications, in fact had no
authority, but famous test pilot Chuck
Yeager was the commandant. Aided
by Lockheed, supporters were in a process
of pushing for the modification approval
for the entire tactical fleet of the F-104,
worldwide, including the German Air Force,
then being equipped with the Starfighter.
The
modification mounted two aerodynamic surfaces
(strakes) below the tailpipe and about
30-degrees angle-off the lower centerline. I
recall each as roughly 5 feet long jutting
out about 12 to 14 inches from the fuselage. One
of the schools instrumented airplanes was
modified for the strakes and an angle of
attack gage in the cockpit. The flight
recorder included altitude, speed, and
angle of attack, and the control positions. The
latter was important!
Col.
Peterson, our director and the top dog
in testing directed me to look into the
school doing that testing. A school
instructor, Greg Neubeck, had been flying
the test airplane, and he concluded that
the strakes were significantly increasing
the pitch-up angle of attack of the aircraft,
thus giving improved turning performance
as well as safety margin. In talking
to Greg he seemed to me overly intent on
proving the value of strake even insisting
that he had rat-raced in both configurations
to get added confidence in his conclusion. The
idea of determining improved performance
in a dogfight made me suspicious of the
claims. It was obvious that the only
way to absolutely compare the effects of
the strakes was to actually fly into pitch-up
in the same, instrumented airplane, with
and without the strakes installed, which
he had not done. And the data would
be absolute: But, only if my hands
were not on the controls before entering
pitch up, and if I stayed off the controls
long enough to record the angle of attack
when pitch up began. At that point
there would be a nose up acceleration without
control inputs, induced entirely by the
pitch up moments. I explained this and
I asked for permission from to test it,
which was granted.
I
had long before begun practicing low speed
control and did loops in fighters starting
pull up at normal landing approach speed. In
fighters of the era, which were not blessed
with high thrust to weight of modern airplanes
that was excellent practice for getting
the most out of the airplane. I had
also flown the F-104 into and out of the
edge of pitch-up with my hands on the controls
and learned how to visually discern the
pitch up with ample time to recover. The
rate at which you exceeded the pitch up
angle and the degree of exceeding that
angle determined the outcome.
That
merely required smooth and gentle entry
to see the pitch rate change in time to
shove the stick forward and recover before
too deep in pitch up. I only needed
to repeat this, except to do it hands off,
which added very little complexity. It
was merely a matter of practicing a few
times to establish trim and consistent
nose-up (pitching) velocity to come almost
to a stop at the pitch up angle of attack
and then see the airplane begin an increasingly
intense, self induced pitch up. Staying
off the controls as the rate decreased
and then increased of its own volition
recorded the exact angle of attack where
pitch up occurred. Repeated data
points in flights with and without the
strakes attached proved there was no change
with the strakes, thus they added only
drag, weight and cost to the F-104. The
large angle of attack display gave me the
method to monitor the occurrence in real
time, which was vital to success.
The
only risks were approaching it with too
great angular acceleration (nose-up, pitch
rate) or delaying recovery after pitch-up
commenced, after which recovery would be
impossible, because of control limitations
of the F-104.
Shortly
after the tests, Col. Guy Townsend jumped
me. He was furious that, in his words,
I would risk an accident to get test data. Nothing
I said cooled him off one iota and it occurs
to me, even today, that I received that
ass-chewing for doing what a test pilot
is supposed to, and doing it with the approval
of a superior. In fact, Col. Pete
was Townsend’s boss, also. I
had no restrictions placed on me not to
fly into pitch-up, and it was impossible
to test conclusively with such restriction.
Every real test flight by definition entails
risk, with only the degree at question!
I never mentioned this to our mutual boss,
Col. Pete (because of my respect for him)
until many years after retirement. This
was the first time I saw the real Guy Townsend,
no longer the sugar-sweet voiced Southern
Gentleman.
To
confirm my recollections, I recently asked
Bob Hoey, the premier engineer of the AFFTC
at that time, if he recalled the tests
and he not only did, but he gave me the
following explanation for Neubeck’s
incorrect conclusion:
Regarding
Greg Neubecks "strakes" -
I finally figured out what he did so
that
his initial report showed the 0.2 to
0.4 g increase with the strakes. He had
compared the max g's that were reported
in the windup turns in Kinch (Iven
Kincheloe)-and-my F-104A report with
the numbers that he obtained during his
qualitative flights with the strakes
(which I think were done at Eglin). My
report used oscillograph data and the
max g was a line faired through the middle
of the buffet trace. Greg recorded
the stop needles on his g meter that,
of course, showed the top of the buffet
boundary. At .9 Mn in heavy
buffet
he would gain at least a half g!! I
could get his numbers by merely reading
the TOP of the buffet trace on my charts.
Being
a test pilot at the AFFTC resulted in some
memorable perks. One weekend Danny
Thomas joined a group of Hollywood entertainers
at the base for a celebrity golf tournament. Our
base was unique and quite open and I happened
to be driving home from the flight line
and recognized Danny sitting in his auto,
looking about rather puzzled. There weren’t
any signs on base, so I pulled over, introduced
myself, and gave him directions. I
was playing in the golf tournament and
he mentioned something about it, but I
knew he was surely scheduled to play with
one of rank.
The
next day, my assigned celebrity was Danny
and the guy who played the part of “Animal” in
the William Holden movie Stalag 17. That
evening we enjoyed an off-the-cuff floorshow
by the group, including Ann Margret, which
was outstanding. Danny Thomas proved
to be a gentle and gracious man and my
respect, after that brief period with him
is best shown in the fact that his St.
Judes Childrens Hospital remains my primary
charity for life and afterwards.
My
affection for Ann Margaret, was rekindled
very recently by a story on the email trail
of her immense happiness in seeing a Vietnam
infantry veteran at one of her book signings. He
brought in a picture he had with her and
she stopped the crowd waiting in line to
kiss and honor him, with sincere praise
to the waiting crowd: for the performance
of “Her Men”. Little
did I know at the time that a “Bob
Hope, show for the troops” would
not be very far off in my own future.