V-2
February 2008
Legacy
V-3
February 2008
Legacy
INTRODUCTION TO PERFORMANCE
The graphs and tables presented in this section identify performance information
for aid in flight planning at various parameters of aircraft weight, engine powers,
altitudes and temperatures. Data you obtain will be peculiar to your aircraft since
its construction and measurements differ from all others. The values (data) you
generate and put into the blank charts provided should be conservative and will
represent the way you fly your aircraft. In most cases it is suggested that you
gather the data, plot it on a copy of the chart and when satisfied plot the final data
in your manual.
NOTE
All airspeeds in this section are indicated airspeeds
in knots (IAS) and assume zero instrument error.
Make sure your system has been correctly calibrated
and account for those errors as necessary .
Due to the Lancairs’ high cruise speed, the location
and quality of the static source can be critical to
the systems accuracy. Most importantly indicated
altitude is affected. This in turn affects calibrated
airspeed, i.e. indicated airspeed corrected for errors
due to both the location of the pitot and static port/s
on the aircraft.
ALTIMETER CORRECTIONS
Static source errors result in
altimeter
errors
and
indicated airspeed
errors. An
airspeed indicator is essentially a differential pressure gauge (pitot vs static) marked
with mph or knot indications. The aircraft static source is used to transmit encoded
altitude and thus must be accurate when used for IFR operations.
Static source correction data should be obtained first, then the corrected altitudes
flown for the airspeed system calibrated tests. Prior to calibration of the system
it is best to have your altimeter (the panel gauge) calibrated. This provides a cor-
rection curve from indicated to true altitude which should be taken into account
when obtaining calibrated values.
Static system calibrations are typically accomplished utilizing “Tower passes”, a
known aircraft, the “pacer” method, or a “trailing cone”.
Summary of Contents for Legacy
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