A
New-Old Antique
by Budd Davisson, courtesy of
www.airbum.com
Aviat
Monocoupe 110 Special
Right up
front I want to make an apology: I
want to apologize to Stu Horn, Aviat's
president, and all the folks up in
Afton, Wyoming for what I was thinking
the first time I saw their version of
the legendary clipped wing, Monocoupe
110 Special. I looked at that tiny
tail, the non-existent windshield, the
tall narrow gear and I was thinking,
"Man that thing is going to be a real
lunch eater. They're crazy if they
think they can sell those things to
mere mortals.!" Now, having flown the
airplane I know how deceiving looks
can be and how far off base I was. I
apologize because, while the airplane
isn't going to be everyman's idea of a
great airplane, to someone who wants a
fast, fun flying machine that truly
has a character all its own, the Aviat
110 Special is certainly it.
When I finally got
my chance to fly the airplane and was
in the process of doing this
incredibly graceless stretching
exercise called "climbing on-board", I
couldn't help but remember pilots
inspecting the airplane at its
introduction at Oshkosh '99: they
quickly separated into two camps. One
was shaking their heads, clearly
amused with just a hint of fear in
their eyes. The other group however,
had fire in their eyes and it was all
they could do to keep from drooling.
Like we said, not everyman's airplane.
When
viewing Aviat's new airplane, a pilot
has to remember several things. First,
the clipped wing version of the
Monocoupe, the 110 Special, was
originally supposed to be a pylon
racer with Johnny Livingston at the
controls and it's designed to fly that
way. Second, people were smaller in
those days. The forgoing facts mean
that both big wings and big cockpits
were unnecessary. The first time you
sit in the airplane, you'll also
assume they thought windshields were
unnecessary as what there is of it is
well above your head.
The cockpit is
narrow. Probably one of the narrowest
of any two place airplane being
offered for sale. That's just the way
airplanes were designed in the late
1920's. Aviat, to their credit,
however has come up with an
interesting solution: rather than
going with the original thick, wood
doors, they designed a nifty steel
frame door that's less than an inch
thick and adds close to three inches
to the shoulder and hip room. So, now
it's tight, but not uncomfortably so.
The door also hinges upwards with a
nitrogen assist cylinder that works
beautifully. It makes getting into the
airplane much easier than with the
original doors and does away with the
need for a jettisoning mechanism which
will be necessary when it is approved
for aerobatics. Still, doing some
stretching exercises would be a good
idea before trying to board. They say
a step is being designed, which should
help.
The cockpit also
has a thoroughly antique feel to it.
For one thing, the top edge of the
instrument panel is almost even with
the top of your head because of the
steep deck angle. More interesting,
the only part of the windshield that
isn't covered by motor is a tiny
sliver at either end of the slightly
concaved instrument panel. However,
even though the windshield is
virtually useless in the three-point
position, the airplane somehow doesn't
feel much blinder than many other
taildraggers. This is because the
fuselage tapers towards your feet just
after it goes past your shoulders
which moves the front door post
inboard giving amazing visibility out
the side windows. No, you can't even
remotely see ahead, but the view
angled out about 30° to the side on
which you're sitting is quite good.
The visibility the other way, across
the cockpit is also non-existent,
which brings up an interesting point:
When taxiing it takes the tiniest turn
away from your side, to uncover the
entire taxiway ahead of you. "S"
turning is not only unnecessary but it
doesn't work because you have to turn
really sharp, probably 60°, the other
way to see out the opposite side.
Ed Saurenman,
Aviat's Chief Designer/Engineer and
all around aviation junkie, lit the
fire on the IO-360 A1B6, pointed at
the control stick, indicating I had
command, and away we went. There were
no brakes on the right side but I
didn't miss them. The tailwheel is
moderately tight and the airplane
tracked exactly the way my feet moved.
No more, no less. With the exception
of having no idea what was on the
other side of the airplane, it was a
cinch to taxi. Almost like a go-cart.
We'll ignore the
first take off because the right door,
mine, popped open at about 60 mph and
I aborted the takeoff. Ed says they've
flight tested the open door up to 160
mph IAS, but I wasn't all that
interested in taking off with the door
hanging out at a 45° angle. In the
process, however, I got a good feeling
for the airplane's ground handling in
a less than optimum situation: besides
accelerating almost up to takeoff
speed with a door open and wind
hitting me in the face, I had Ed
Saurenman laying across my lap trying
to close the door. At no time did the
airplane do anything stupid. I was the
one who did something stupid in not
getting the locking pins completely
set. The next takeoff was more
successful.
The vernier
throttle (more on that later) doesn't
have to move very fast to get a
terrific reaction out of the airplane.
I eased the power in and got the
airplane rolling then pushed it the
rest of the way and held on. The
engine is exactly the same as in my
Pitts and we were carrying the same
number of people, but the acceleration
was easily half again what I see out
of my own airplane. I think I had
adrenaline pooling in my boots.
I was watching the
side of the runway out my window and,
as the tail came up, I didn't have
time to re-focus my eyes over the nose
before we leaped off the ground. But
this was not a lift-induced leap. This
was the ballistic launch which is part
of flying tiny airplanes with big
motors. What a rush! It would be worth
buying one of these things just to do
that over and over.
The instant we came
off the ground, the left wing came up
and I pressured it back down while
playing with the rudder to keep my
butt in the middle. The airplane
doesn't have a skid ball and doesn't
need one. Even though we were sitting
almost on the CG, it was amazing how
much you could feel the airplane skid
when it wasn't in trim. On every
takeoff the wing would could up and I
couldn't figure out why. Finally, I
asked Ed and he said it was because
that tank was empty and the airplane
was so sensitive to loading that wing
simply flew first.
Usually, I climb a
strange airplane out at a flat angle
to get better visibility but, since
we'd have to be dead level to see over
the nose, I just held it at 100 mph
and watched the ground rapidly
disappear out my side window. The
specs say the airplane will climb at
1700 feet per minute and I wish I had
timed it because that's what my Pitts
climbs at and this was going up
noticeably faster. The airplane is
definitely a rocketship!
As I pushed over
into level flight, the visibility got
better and better until it was almost
normal, but I had to duck my head to
look under the wing for side
visibility. Turns in either direction
felt much better, if I picked up a
wing to clear the area first. As I
played with the controls I could see
that they had done quite a bit with
the ailerons in trying to get away
from the traditional heavy, scratchy
feel of original Monocoupes. They'd
changed some linkages to give the
stick more mechanical advantage, but
were still limited in travel by leg
room. Ed said as soon as he got the
airplane back to the factory, they
were going to design a control stick
with a higher pivot point so they
could increase the mechanical
advantage through the system even
more. The pressures are acceptable, as
is, but everyone, Aviat included,
would like to see them lighter.
Ed had said it was
a "rudder airplane" but it wasn't
until I started messing with the
controls that I saw he wasn't kidding.
As I was turning, I was
consciously trying to coordinate and
was paying special attention to what I
was feeling. There was a lot of
slipping and skidding I was
compensating for but it wasn't until I
tried separating the controls to do a
turn without rudder that I figured out
what was happening. Prior to flying
this airplane, I'd always thought the
Aeronca Chief to be the King of
Adverse Yaw, but it doesn't hold even
a very small candle to the 110 Special
in that area. Using enough aileron to
pull a wing up 15°, with out rudder,
results in the nose going the other
way while the airplane ignores the
entire process and continues straight
ahead indefinitely with the nose off
to one side. In a 15° bank, it would
absolutely refuse to turn without
rudder. Just tap the rudder, however,
and it would come around smartly. I
then found I could lock the stick in
neutral and put in the tiniest amount
of rudder and it would roll into the
nicest, most coordinated turns I've
ever done. Tap the rudder harder and
the airplane would snap into a bank
almost instantly. Old Johnny
Livingston wanted to turn corners and
this airplane would definitely do
that. The roll-yaw couple was by far
the strongest I've ever seen.
Let me make one
thing clear here: even though the
feeling that you have to constantly
play with the rudder is initially
strange, this is no way a negative.
It's just an unusual characteristic
you get used to in a few minutes and
you can fly along indefinitely with
your arms crossed while flying the
airplane just fine with your feet.
If you walk the
airplane back and forth with the
rudder then let go of the rudder, it
immediately locks up in the direction
it was pointed and sets up a fairly
steep spiral and it doesn't make any
difference whether you freeze the
rudder or not. Again, not a bad
characteristic, but one worth noting.
After they got the
airplane back to the factory and
listed all the comments made by
journalists and prospective dealers
who had flown the airplane they made a
number of significant modifications.
Their goal was to make the airplane
handle in a more normal manner. The
mods included increasing the size of
the vertical tail (a big percentage
increase but you still can't see the
difference). They put spades on the
ailerons and changed the linkage to
give more mechanical advantage. I
talked with Ed about the changes in
some detail and he says it completely
eliminates any of the airplanes
"strangeness" and any pilot would find
it to be very normal feeling. He also
said the ailerons are not only much,
much lighter, but the already spiffy
roll rate was even higher. Alright!
I couldn't check
the pitch stability because the bungee
trim system was out of whack and was
constantly biasing the elevator
slightly. The elevators, however, felt
completely normal.
The airplane is
really fast for the power. We were
indicating right at 170 mph at 23
square and Ed says he flight plans 175
mph and always gets it. He also says
he thinks the airplane has another 20
mph in it. Just prior to leaving the
factory, a mechanical glitch had
forced them into replacing the
Hartzell composite two-blade with a
conventional, and shorter, metal prop.
Ed says the instant they did that they
lost 8 knots in cruise. Also, since
its Oshkosh introduction, the airplane
has been under going constant
modification including lowering the
cowl line nearly 3 inches. This
changed the windshield angle and, when
Ed and I got together, the fairing
strip at the top of the windshield was
still the original and had a huge
amount of drag-producing gaposis. He's
confident they'll have the airplane
cruising effortlessly at 190 mph or
more before serial production begins.
I was interested in
how the airplane would stall, so I
chopped the power and held the nose
slightly high. Then, I pulled and
waited. Then, pulled and waited some
more. The airplane didn't want to slow
down and, as it came down through 85
mph, it REALLY didn't want to slow
down. Eventually somewhere in the high
60's, with little or no buffet, those
tiny wings suddenly unloaded, the nose
fell and it rolled off on a wing. It
has a very clean break with not a hint
of a mush. The instant I released back
pressure, however, it was back flying,
even before I brought the power up.
The book stall speed is 68 mph and the
wing is the good old fashioned Clark
Y.
When stalling the
airplane I was careful to keep things
centred as they haven't done the spin
test series yet. For that reason we
couldn't do any aerobatics. This was a
disappointment because Woody Edmunson
in his 110 Special "Little Butch"
helped set the stage for serious
aerobatics in the late 1940's. Once
the spin tests are completed, however,
the airplane will once again be able
to dance, which I imagine it will do
really well. I couldn't measure the
roll rate, but when you put your
shoulder into I'd guess it at
something around 150°/sec.
As we
came back into the pattern, I was
feeling much more comfortable in the
airplane because I found the
rudder-only thing made it much easier
to handle. However, as we slowed down,
I once again had to put some aileron
into the mix. Ed had said to use 110
mph for the first approach (100 is
normal) and I found it dead simple to
put it on an IAS number and keep it
there. It was terrifically
speed-stable throughout the approach
even though we weren't using trim.
Visibility isn't an
issue during the approach. Not at that
speed, anyway. The runway sits in that
tiny windshield, which doesn't seem
that tiny after the first hour, and
lets you drive right down final. It
was about half way down final that I
got yet another surprise: the airplane
really wants to glide. I had expected
it to fall out of the air the second
the power came back and the prop
flattened out, but it didn't. In fact,
I was coming in too high to hit the
numbers.
As we floated down
the runway, I started flaring and, as
the nose came up, I automatically
shifted my eyes to the runway edge
visible in the windshield sliver at
the edge of the instrument panel. As
the nose came up further, my eyes kept
tracking back until I was once again
looking out the door window. It all
seemed very natural, although I don't
like looking at just one side of the
runway to land. I prefer glancing at
both.
I held the airplane
off and it floated and floated, then
gently touched and hopped a little in
three-point. I didn't rush the
throttle, but waited to play with the
rudders as it slowed down. Again, the
airplane followed my feet and, with
the runway edge so clearly in sight,
it wasn't hard to see the changes
needed. I was using very little rudder
and the airplane was giving no
indication it would do anything I
didn't ask it to.
Power up, we
scrambled back into the air. What a
blast! If the sun wasn't just about to
set, I could have kept doing that
until we ran out of gas.
On the last
landing, I was a little slow getting
the tail down and we kissed gently off
the mains setting up a little skip.
Not wanting to drop it in, I thought
I'd ease in just a hint of power. I
got the hint of power in but forgot
about that stupid vernier throttle (a
friend of mine is taking up a
collection to fund AAVT, Aviators
Against Vernier Throttles) and I
didn't get the hint out until it
touched again. And again. And yet
again. Do I get to log all those
landings? Through out the entire
embarrassing episode, the airplane was
absolutely honest and not once did I
feel any centrifugal force against my
seat telling me the airplane was
trying to turn hard. I gave it every
opportunity possible to take a chunk
out of my behind and it just trucked
ahead and did it's thing.
I don't know if the
Aviat 110 Special is indicative of all
such Monocoupes or not, but I was
impressed by its ground handling. It's
honest and direct and is very, very
much like a Luscombe, yet another
airplane with an undeserved
reputation. The only reason a pilot
would have serious trouble with it
would be because he over controlled it
and didn't realize the airplane was
only doing what he told it to do. The
lack of visibility and the rudder
would take a little getting used to
but that's all minor stuff.
The airplane is
really intriguing in that it is an
honest to goodness modern antique that
is useable. It has four hours worth of
gas and can shuffle along at a healthy
clip and let you arrive in style.
Here's an airplane for the antique
buff who wants the appearance and fun
of an antique but wants to go places
at the same time without worrying
about something breaking and letting
him down. It's a new antique for the
new millennium.
Aviat
Monocoupe 110 Special
Power Plant
Lycoming IO-360 A1B6, 200
horsepower
Wing span:
23'10"
Overall
length: 19' 10"
empty
weight: 1160 pounds
Gross
Weight 1624 lb.
Vne: 207
mph
V cruise,
75%: 173 mph
Vstall 68
mph
Rate of
climb: 1700 fpm
Range @
cruise: 475 miles
Fuel Total:
42 gallons
Baggage: 20 pounds
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