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Flitzer Z-21
The Flitzer Z-21 is the first of Lynn William's designs to be published,
but it is the result of a lifetime of
researching, designing, and building of light aircraft. This is the first of an intended series of light sport
biplanes that span the range of ultra-lightweight flyer to serious aerobatic mounts. Above all, the Flitzer
Series of designs are created to "provide desirable handling characteristics and good all-round performance
in an affordable airframe that is unashamedly vintage."
The Flitzer Z-21 represents the best all-round flying machine of the Flitzer Series, and likely the simplest to
construct. It is small in size, but large in character and performance. It has been designed specifically
around the small, flat four cylinder engines in the 50 to 80 horsepower range; of which there are several
choices that are both economic and reliable.
 The wide landing gear and large wheels make landing easy, especially on grass fields where this design is
most at home. Short field performance is exceptional, and the design has very good cross-wind capability
when required. The Flitzer Z-21 may be safely operated from small grass fields of 1000 feet in length or
less.
 In the words of the designer, "It flies beautifully because, although it is well damped, and able to fly hands-
off in the cruise, it is highly maneuverable notwithstanding its relatively low power. The masses of the
engine, fuel tank and pilot are grouped closely about the C of G. Everything has been contrived so that the
aeroplane will balance, and provide a good pilot view, without recourse to sweep back. The USA 35B
wing section - the same as on a Piper Cub - makes it very stable and forgiving. That section hangs onto lift
even at a 20 degree angle of attack, and at full power the aeroplane can hold an attitude of 35 degrees."
"The aspect ratio (span to chord) is 6.5:1 for the top wing and a little greater for the lower. This gives a
good climb rate and a gentle stall. Turn rate is about 360 degrees in seven seconds."
It has been described as "handling like a Pitts S-1C, except that, being 240 lbs lighter, it is considerably
easier to land!"
The cockpit has been designed with generous dimensions, and is configured such that the pilot sits within
the fuselage protected from the wind. The authentic classic windshield provides protection in most all
configurations, including take-off and landing. Full shoulder and lap harness attachments are provided and
the simple instrument panel provides room for basic VFR instruments. Pilots up to 6'-6" in height and 215
lbs. have flown the Flitzer Z-21 with ease.
 The simplicity of the design becomes apparent during construction. All construction is conventional and
uncomplicated. The simple cabine strut and landing gear reduce the weight and complexity if the design.
There are a minimum of steel fittings and very little requirement for expensive hardware. The longest
component (the fuselage) is less than 12 feet long, making it a project that can be constructed in a small
workspace, such as half a garage or even a spare bedroom. In fact, by proper selection of building
materials, it is practical to build all components of the Flitzer Z-21 up to and including the painting stage
within a very small workshop, and then transport the pieces to the airfield for final assembly. Final rigging
of the plane is straightforward and done without expensive equipment.
The Flitzer Z-21 is designed specifically for delightful recreational flying. It is easy to build, easy to fly
and easy to own. It captures the essence of the light sport flying movement, and accomplishes it with
unabashed style and poise. Join the movement - become a Flitzer Flyer.
Specifications
Wing Span - 18'-0"
Wing Area - 97 sq.ft.
Length - 14'-9"
Tare Weight - 480 lbs
Gross Weight - 750 lbs
Engine - 50 to 80 hp (data for 1834 cc VW)
Fuel Capacity - 10.6 USG
Cockpit Width - 22" (24" optional)
Wing Loading - 7.7 lb/sq.ft.
Power Loading - 12.0 lb/hp (@60hp)
Performance
(Note: all performance data verified by flight test)
Top Speed - 95 mph IAS
Cruise Speed - 86 mph IAS
Stall Speed - 42 mph IAS
Range - 300 miles
Rate of Climb - 720 ft/min (@ 1500 ft AMSL - STP)
Take Off Distance - 400 ft
Take Off over 50' Obstacle - 900 ft
Landing Distance - 400 ft
Service Ceiling - 12,000+ ft.
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