Cub stories are
always of a whimsical nature. "I remember
falling out of one when trying to get out of
the front seat," or "We always used to glide
down over the tree tops by the river bottom
to surprise the girls skinny dipping." There
are damned few blood and guts Cub stories
because, except for frontline liaison
stories, the Cub just wasn't made for blood
and guts situations. Besides, everybody has
flown a Cub, so too many people can figure
out whether you're lying or not. Better to
stick with Leopoldopf Colibris, or
Polikarpov I-16s. With those, not many can
tell whether your facts are straight.
Even though the
perennial yellow Cub may be plain vanilla,
there is a Cub mutation that is guaranteed
to give rise to a few stories and definitely
is capable of inspiring blood and guts
narrative. This mutant is known as the
"clipped Cub."
Originally,
when you spoke of the clipped Cub, you were
talking about one specific type of animal.
These days, however, thirty-odd years after
the first Reed Conversion was STC'd, you
have to be very careful what type of machine
you are talking about, because the Reed
clipped wing conversion was just the
beginning in a whole new saga of the J-3
Cub.
The original
Reed conversion did nothing more than
shorten the wings 40 1/2 inches on each
side. No, this wasn't done by whacking away
at the tips, as many folks believe. Rather,
the inboard forty were sawed off, the attach
fitting holes redrilled and the wings thrown
back on. A few other little goodies had to
be done, such as installing a vertical "U"
shaped stiffener that bolted vertically to
the spars and picked up the upper lift strut
bolt. This was needed because when the wings
and lift struts were shortened, the strut
intersected the wing at a different angle,
which introduced eccentric loads on the
original lift strut attach fittings, a
definite no-no. This changed strut angle
also meant the fuselage strut fittings had
to be heated and bent.
The supposed
purpose of the Reed conversion was to take a
little of the Cub out of the Cub. It cut
down the float on landing, made it less of a
cork in rough air, made it stronger because
the bending moments were less and speeded up
the roll rate because the wings were
shorter. It is highly doubtful if any Reed
conversions were done to help the airplane's
stability. It was the last two points, the
increased strength and roll rate that caught
everybody's eye. Here was a way a couple of
guys could spend a weekend with a sabre saw
and welding torch and produce their very own
65 hp acrobatic machine. Incidentally, the
Reed STC applies only to wood spar Cubs,
although I believe there is an STC for
chopping aluminium Cub spars.
A Reed Cub
looks just exactly like any other Cub,
except that there is only one short rib bay
between the ailerons and the fuselage, as
compared to a couple bays in the stock Cub.
However, the biggest majority of clipped
Cubs are pretty easy to identify because the
builders seldom stop with trying to increase
their "stability" or cut down on the float.
These days, the Cub is like the 1932 Model B
Ford used to be, before the price went out
of sight. When I was a kid, if you could get
a fat motor under the hood, you put it under
the hood and, if it didn't fit, you moved
the firewall or left the hood off. Clipped
Cubs now fall into the same sort of street
rod category. The originals may have been 65
hp, but there are precious few of them still
flying on that few ponies. 85 hp is the
norm, with C-90s and 100 hp 0-200s being as
common as ladybugs.
I guess I've
had my share of fun in Cubs, clipped and
otherwise. I've chased girls down river
banks, sneaked around ridges to surprise
coyotes and landed on top of moving trucks.
And, like everybody else, I've done probably
a thousand loops, two thousand rolls and a
million spins in Cubs. But that was a few
years back, more than I'd like to admit to.
Now, when I see a nice, stock looking,
yellow clipped Cub, I can't help but stop
and look at it. It can't hold a candle to a
Pitts in performance, but there is nothing
prettier than a well done clipped Cub. And
Joe Eubanks, of Daytona Beach, Florida, has
a well done clipped Cub.
When I saw
Eubanks' Cub, I was in the process of
strapping on a Jungmann, but the urge was
still there to unbuckle and walk over to
look at it. My generation of pilot can trace
its roots right down to the Cub, and I can
trace my early aerobatics down to the same
source. So nostalgia may have a hand in
colouring the way many of us look at Cubs in
general and especially those of the clipped
variety.
As it happens,
Joe Eubanks had just taken delivery of his
shiny yellow fabric toy and was looking for
any excuse to fly it. Give him a reason
("Hey Joe, is the beach still there? Let's
go check."), and he's gone. I said something
like, "Boy, is that thing cute." He said,
"Right, let's go flying." Joe's a real
pushover.
Joe's clipped
Cub is a classic example of what the breed
is all about. Except that it has a few
little tricks that developed fairly
recently, it could be sitting on the ramp in
front of Any-FBO, Inc., Small Town, Kansas,
circa, 1951. Many folks can look at a plane
like Eubanks' and not even realize it's a
wolf in sheep's clothing, or at least a
Pekinese in drag. It looks exactly like a
restored J-3 because it's hard to judge the
wing length without something to compare it
to. Black lightning bolt down the side, jugs
hanging out in the breeze, Cub decal on the
fin, fat bagel-like tires . . . it's all
Cub. Except it's not.
What sets Joe's
airplane a little apart from the standard
Reed clipped Cub is its detailing and the
extra thought given to its new role as
acrobat. Rather than doing just the Reed
mods, who-ever built the airplane up
originally worked in all the details that
have been found to make clipped Cubs a
little better. One of these is doubling up
the ribs, putting an extra one between each
of the originals. This not only makes the
fabric panels smaller and stronger, but
eliminates the age-old (or is it old age)
clipped Cub problem of ribs which break. The
original rib spacing was just fine for
flying out of a farmer's field, but repeated
bashing at 4-5 gs would cause the aluminium
built-up ribs to break and you had to open
up the skin to repair them. Similarly, the
rib stitching is tighter, allowing a little
extra diving speed without popping some
fabric loose.
These days,
it's possible to build a practically brand
new Cub, since Univair of Denver, Colorado
makes just about everything you'd need from
new cowling to ribs and landing gears.
Granted, Wag-Aero of Lyons, Wisconsin does
make a completely new J-3 kit, the CUBy, but
it's a homebuilt, and can't be licensed in
standard category. Also, none of the CUBy
parts can be used on a stock J-3 because
they don't have an FAA PMA (Parts
Manufacturing Approval) number. Univair's
stuff, on the other hand, carries the PMA
number because they bought the licensing
rights from Piper, so they are the
manufacturer of record. This is all
basically a crock, since the only real
difference is a rubber stamped number, but
that's the way the system works.
The nice part
about having a supplier like Univair around
is that Cubs like Eubanks' can be built up
using brand new sheet metal. The cowling and
boot metal on Joe's airplane doesn't have so
much as a fingerprint on it, which makes for
a super sanitary appearance. Also, an
airplane like Joe's can be built using brand
new ribs and spars, something worth
considering if you're thinking about doing
aerobatics on parts that may be as much as
forty years old.
Crawling on
board a Cub, clipped or otherwise, is a
great way to slip a disc. It makes everybody
look, and feel, like an arthritic giraffe,
because everything, the struts, the door and
the seats are carefully arranged so that
they get in the way, no matter how you
approach them. Then, once inside what look
like uncomfortable seats from the outside
turn out to be truly awful. The front seat
is okay, except the rudder pedals are so
close you find your knees in your shirt
pockets. The back seat, which is really just
a canvas sling, is akin to sitting in a
hammock at a 45 degree angle. And that back
seat, where you solo the airplane, is
usually beefed up with stronger canvas,
because more than one clipped J-3 akro pilot
has found his butt falling through a rapidly
widening rip in the bottom of the seat.
Joe's machine
has a 90 hp Continental with a pressure carb,
which used to be the hot setup and still
ain't bad. Because of the carb, Joe, who was
wedged in the front seat, had to work a
wobble pump a little to get the fuel
pressure up before somebody flipped the prop
through a couple times. "Switches on, brakes
and cracked!" I hollered. The prop was
flipped once more and the little Continental
started chortling away and off we went.
Taxiing out to
the runway, I was once again reminded of the
incredibly bad brake system the Cub has.
I've always hated heel brakes and the Cub's
are the pits, because you can't reach them
when you need them and when you do, they
don't work worth a hoot.
It's a good
thing a Cub is a Cub and you really don't
need brakes anyway. It's only the Cub's
gentle nature that kept an entire nation of
pilots from rising in a revolution and
forcing Piper to go to toe brakes, or at
least heel brakes that can be used.
Of course, as a
trainer, the brakes were situated just fine.
Since a student could hardly reach them, he
seldom got himself in trouble with them. He
also learned to get himself back on the
straight and narrow with the rudder rather
than relying on brakes, such as they were.
When it's
springtime in Florida, and it was, a Cub
might as well not even own a door, because
nobody in his right mind closes it. As I
lined up on the grass and started shoving
the throttle up, I gazed out the open door
and wondered how many thousands of pilots
and passengers have done the exact same
thing.
The Cub isn't
the standard for docility and fun for
nothing. A couple of plaintive bleats from
the Continental, a few gentle suggestions
from my feet and we were off. But not in
much of a hurry. A 90 hp Cub in Florida with
two folks on board isn't going to win any
time-to-climb contests. About 600 fpm seems
to be average. That will go up to 800 fpm or
more with only one on board and a little
cooler temp. The clipped wings suck a little
out of the climb, but the 90 hp makes it all
back up. However, as a slight amount of
thermal turbulence started working us over,
it was obvious even to one who hadn't been
in a Cub for some time that losing nearly
seven foot of wing makes the Cub a lot more
sure footed in the bumps.
At altitude, I
racked it around a bit, trying to get back
the feel of that tall stick and those so-so
ailerons. As it happens, Cub ailerons are
one of the areas that a lot of guys modify
when they go the hotrod route. Some seal
them, some servo them, but no matter what
you do, the roll rate is still some-what on
the leisurely side. It's a lot better than
stock, but it's not going to thrill the
underwear off a Pitts pilot.
Satisfied we
were in that particular piece of airspace
all by ourselves, I ducked the nose down for
a second, got 110 mph on the gauge, pulled
the nose up and fed in aileron. Then I fed
in some more. Up and over the top, easy and
graceful, as a roll should be. The Cub had
no problems with the manoeuvre, but it was
obvious it wasn't going to go rushing
through it, no matter what I tried to make
it do.
Aileron rolls,
barrel rolls, four points (sort of), and
slow snap rolls (not recommended without
good tailwires), we went right down the
menu. And it was fun. I think I had
forgotten what it was like to have to
actually "fly" an airplane through a
manoeuvre. I'm so used to just pointing the
nose, wiggling the stick and the Pitts does
the rest. Not so with the clipped Cub. If
it's going to do the manoeuvre at all, it
will be because you've carefully balanced
the dynamic and aerodynamic forces acting on
the machine and made its flight path teeter
along on the tightrope that is aerobatic
flight. Ease up for a second and the
manoeuvre just won't look good. Of course,
you can botch it up six ways from Sunday and
the clipped J-3 will just shrug its
shoulders, fall a little ways, (just to get
your attention) and then will sort things
out all by itself.
Loops are the
clipped Cub's strong point. 110-120 mph
(redline) on the clock, an even, low G pull
and the nose easily climbs an invisible
rope, arching its way into the domain where
the blue is down, the green up. Gently
relaxing the pressure on the top rounds out
the loop, taking some of the "eggy-ness" out
of its shape. Then the nose is falling down
and it's time for a little more back
pressure to bring everything back into level
flight.
I remember the
days when I thought nothing of honking a
clipped Cub around as if it was a 450
Stearman. It would do a fair to terrible
English bunt (half an outside loop from the
top) and would glide like a stone inverted,
gas running out of the cap all the time.
Eubanks' had a vented, inverted fuel cap and
the fuel injection would let it run a little
longer, but I somehow didn't feel like
playing those kind of games. I was a lot
younger in those days. So were the Cubs.
Power back,
nose up. Bam! The stick comes back and a
rudder goes down. The Cub whips over into
the prettiest little spin any airplane can
do. One, two, three, four. Opposite rudder
and a slight relaxation on the back
pressure. No need to jam the stick forward.
The Cub will spin only if you hold it in.
Relax a little and it will pop out before
you're even ready for it. Since a Cub, even
a clipped one, will glide well enough to be
able to slope soar ridges in a strong wind
with absolutely no power, the best way to
lose altitude is in a spin. And that's
exactly what we were doing.
It was on final
that I recalled the only really noticeable
difference between a stock J-3 and one
that's clipped: losing seven feet of wing is
bound to do things to your glide ratio.
Where a regular Cub will bob and weave on
final, threatening to keep on gliding past
Peoria, a clipped Cub, sits there like a
Mustang, riding a taut wire attached to the
ground. It usually surprises first-time
clipped Cub pilots to find themselves having
to use power on final. I personally like it.
It allows you to handle a lot more wind and
you can put the airplane right where you
want it.
Once down into
ground effect, the clipped Cub still allows
you to make those beautifully soft,
whispering landings that grass runways and
Cubs were made for. A gentle whoosh and
you're down. There aren't many things in an
airplane that can beat that kind of feeling.
Right now there
is a legion of clipped Cub fanatics who are
screaming that we didn't touch on this or
that detail. They're yelling that we missed
the importance of the larger lift strut fork
or the beefed up strut mod. We didn't talk
about aileron bracket problems, or threading
rudder cable through the struts as a safety.
They are right. There are a dozen things,
maybe a thousand, I've missed, but the best
way to learn all those is to start climbing
the aerobatic ladder the same way a lot of
us did. Go find a clipped Cub and an
instructor and have at it. You'll never
regret it.