KNIGHT
TWISTER
First
Flight
An
excerpt from an article written for the July 1993 Experimenter.
May,
1964. I had "lost the toss" and got to make the first flight. We had
hoped to keep it low key but with so many support people involved, it proved
impossible. Channel 12 News showed up. Volunteer firemen in hooded aluminum foil
suits, a chopper with an external litter and on-board cameraman and my partner
and a friend in a Swift rounded out the support group. In addition, a number of
fellow workers with their wives and kids showed up. It was like a circus!
The
FAA representative finished his final inspection, handed me the freshly typed
airworthiness certificate and settled back to watch the fun. Everyone else stood
back with morose looks on their faces as if watching someone in the last moments
of a terminal illness.
My
mouth was so dry as I taxied out that I couldn't have spit if my life depended
on it. The 90 hp Franklin bellowed through the short stacks and I was on my way.
After leaving the ground at around 100 mph, a shallow climb was initiated.
Control pressures were light and sensitive as expected. A gentle left turn
allowed me to locate the Swift and the chopper as we headed for the practice
area.
At
altitude some turns, coordination rolls and wing overs were performed to assess
control pressures with speed bleed off. Next came landing attitude stalls. A
quick check of the chute harness and a glance at the chase plane and away we
went. The last figure I saw on the rapidly unwinding airspeed indicator was 85
knots....then the airplane pitched down so violently that I was thrown against
the straps, fuel squirted out of the vent in the gas cap and I found myself
looking at the ground over the top wing. This was coupled with a violent roll to
the left. Full throttle and a rapid (3.5g) recovery was made with a loss of 800
feet. I was sure I had missed something so I climbed back to altitude and did it
again. Same results! It was obvious that the approach and landing would prove to
be a very educational experience.
As
descent and pattern entry were in progress, the rescue chopper was spotted
hovering near the approach end of the runway. The Swift was just behind and to
the left. Initial approach speed was 100 mph, but it soon looked as if I might
overshoot. The nose was lowered and power reduced. The six foot propeller acted
as a drag chute and I lost 200 feet before I could get the throttle open. Not
wanting to experiment further, I settled on 115 mph for final and wheeled it on
at 95 mph. After a long rollout I taxied back and dismounted. Everyone just
shook their heads.
Subsequent
flights confirmed that the stall came at around 90 mph. The vicious rolling
pitch down was a permanent part of the airplanes personality. The spin tests,
six turns in each direction, showed the spins to be fast and that the nose would
begin to come up a little after the fourth turn. Recoveries were positive and
took a full turn to a turn and a half after the control inputs.
Even
with its built in "attitude" the little Twister was a dream to fly; a
real thoroughbred. We did Cuban eights, snap rolls, aileron rolls and barrel
rolls with it and cut a lot of toilet paper with the inter-plane struts. Once it
earned your respect it was thoroughly predictable and a delight to fly.
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