Dan Taylor knows the Blériot XI inside and out. As a pilot and historian
at Old Rhinebeck Aerodrome in Rhinebeck, New York, he helped restore an
original 1909 model to flyable condition and serves as its official pilot
during the Aerodrome's weekly air shows. Below, Taylor guides you through a
tour of this pioneering aircraft, giving you a detailed view of its key systems
and aeronautical innovations.
Front view
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Large, paddle-like blades set at deep angles relative to each other helped give the
Blériot XI efficient thrust despite its low-powered engine.
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Propeller
The propeller on this plane is a typical design of the period—a
Chauvier-type style of propeller that was used during that early period. These
engines didn't turn up very much. They were engines that maybe turned up 1,400
or 1,500 rpms, not like these big engines today that are turning up real fast.
A big, slow-turning prop was much more efficient. The Wright brothers knew
that, and their propellers were turning very, very slowly but moving a lot of
air. This is the same thing with this engine, too. When I'm going down the
runway at maybe 30 miles per hour, it's only turning up about 1,800 rpms
maximum.
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Built by motorcycle engine designer Alessandro Anzani, this engine was
lightweight but provided just enough power to keep the Blériot XI
aloft.
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Anzani Engine
Many of the early airplanes carried very lightweight air-cooled engines. They
wanted a lightweight engine because they didn't really figure out all the
structures yet as far as the bracing of the airplane. You look at airplanes
today and everything is streamlined. They know about metals. Back in the early
days, they didn't. They were experimenting. Everything was a new trial. This is
a 30- or 35-horsepower Anzani engine. Blériot flew the English Channel
with only a 25-horsepower engine, but this was the next step up. It powered the
airplane pretty well but it was prone to overheating with its cast-iron
cylinders because you weren't moving very quickly. You were probably doing only
35 or 40 miles per hour. Hold on to your hat! It was an airplane engine that
was very useful for this airplane before the rotary engines came out. The
radial air-cooled engine worked pretty well in its day.
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Since his light airplane was often thrown about by wind close to the ground,
Blériot designed landing gear that could pivot, allowing his craft to
turn slightly into the wind yet keep rolling in the direction of the
runway.
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Main Landing Gear
Back in 1909-1910, these airplanes were feathers in the wind. They had a
problem with that. So what Blériot did was make the landing gear pivot.
It has what's called "castering landing gear." As I take the airplane and I
move it from side to side, the landing gear actually pivots a little bit. And
the reason for that was so that the airplane could still land at an angle and
the wheels would track whatever direction you were going. That's a feature
that's still used today. Certain bombers and airplanes actually have a
castering gear that you can dial in for a crosswind landing. Pretty remarkable:
technology from 1909.
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This original data plate from 1909 shows the aircraft's origins and factory
information.
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Data Plate
This example here [of the Blériot XI] is serial number 56 of about 900 that were made.
This [plane] was
found at a junkyard in Laconia, New Hampshire and all the parts that were there
showed a data plate and the data plate said "Paris, France. Serial number 56.
Blériot Type XI." It is the oldest flying airplane in the United States
and to have the opportunity to fly an airplane like this here at Old Rhinebeck
is a great honor.
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With a low-powered engine, these deeply curved wings are needed to provide
lift during slow flight.
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Wing Design
The wings on this airplane, if you look at them, you'll notice that the
structure has a big what we call in aviation terms "undercamber." If you look
at a jet today, it's almost like a flat board out there. The reason for that is
that you don't require as much lift because you have a lot of speed, a lot of
propulsion. With this airplane Louis Blériot knew he didn't have a lot
of power, so he needed a lot of lift at slow speeds. This airfoil gives a lot
of lift at slow speeds but has a very abrupt stall characteristic. In other
words, if you don't keep that wing flying, it doesn't mean the engine stalls,
it just means that the engine ceases to have lift. So because of that, you have
to make sure you always have speed over those wings or it can drop a wing and
you can prang it. But, just the same, the wing design is very unique to
Blériot.
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Side view
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Used to control the lateral movement of the aircraft, this feature is
still found in contemporary designs.
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Rudder
To steer the airplane—much like conventional airplanes today—I have
a rudder so I can make left turns and right turns very simply by moving that
stick and the rudder bar in the cockpit. And this hasn't changed at all on this
design. This is pretty much the way it always was.
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The elevator controls the pitch of the aircraft, allowing it to climb or
descend. Blériot was one of the first to pair this with a rudder,
creating a now-standard tail design.
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Elevator
Moving the stick fore and aft has elevator control for pitch. Pull back on
the stick and up we go—and the other way down. So, houses get smaller, and
houses get bigger.
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Despite its appearance, this feature only supports the tail once the
aircraft has stopped. Other versions of the Type XI used bamboo skids instead
of wheels.
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Tail Wheel
This is the tail of the Blériot XI. There were several designs. There
was the wheel, like we have on this Blériot XI. There was also another
method of doing it where it was bamboo cane that was bent around as a "tail
skid." And they used that too on some of the later Blériots.
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The body of the Type XI had to be both strong and lightweight, so
Blériot designed a system of wire cross-braces to secure its wooden
frame.
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Frame
The construction of these airplanes—they're built a little bit like a bridge. You
can see that there are cross wires that are tightening all these pieces
together. All this is held in compression and in the cross-brace it's giving
you the strength. Louis Blériot came up with his own style of
turnbuckles, and it's just a piece of stiff wire that runs threaded between
here and as you tighten these little nuts up it would pull this wire tighter.
And sometimes if you had a hard landing or something you'd need to retighten
them because the wire would stretch. This was considered the Louis
Blériot style of a turnbuckle. Nobody else really copied it. It was just
a design very unique to Blériot alone.
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The Blériot XI uses wing warping, a flight control system
pioneered by the Wright brothers, to turn the aircraft left and right.
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Wing Warping
Okay, so for the wing warping, as I'm balancing the airplane I can move the
stick from side to side. That would warp the wing, bending it almost like a
bird, in order to bank the airplane. When I'm flying the Blériot XI, in
this particular airplane I have very little power, so I have to be very slow on
the controls, be ready for any pitch change or any attitude change that I have
to correct right away. Sometimes, if a wing goes down, moving the wing warp
isn't enough and I can actually physically shift my weight in the seat, lean to
one side, and very slowly that wing will come back up again.
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Cockpit view
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The Type XI features a single control stick and a set of foot pedals to
steer the aircraft, a configuration that remains standard today.
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Flight Controls
As you look at the cockpit you'll notice the control stick, called the cloche,
that bell-shaped housing that's named after a lady's dress style of the period.
The wheel on the top of the control stick really doesn't turn or anything. It's
just something to hold on to. You can see the wires that are attached just to
the sides of that bell housing and those go out to the control surfaces. They
go to the elevators, to the wing warp on the wings, and then you can see the
rudder bar—a wooden footrest almost—and that's what you would use
to operate the rudder. When I'm flying the Blériot XI, in this particular
airplane I have very little power so I have to be not overly generous with the
control movement because you can get yourself into an awkward attitude of the
airplane where you may not be able to recover. So everything in this airplane
is done very slowly.
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In 1909, aircraft cockpits had few if any flight instruments. This Type XI
features only two: an oil pressure gauge and a tachometer.
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Instruments
Blériots were used a great deal for the great circuit races of Europe in
1911. And navigation was coming into its own at that time, so they were
learning about using maps and using a compass and things like that. But in the
early days when they started out, instrumentation was very, very limited.
Usually it was just an oil pressure gauge, maybe an air speed indicator, but
for the most part it was just basic instrumentation. Doing what I do when I fly
this airplane is flying what we call "by the seat of your pants." You really
just kind of feel how the airplane is that particular day when you're taking
off. Does it feel light? Can I pull back on the stick? Oh, it's still going too
slow: I have to lower the nose a little bit. It's all done by feel.
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