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Speedsystem with SPI
Optimal cross country glide between two thermals requires an on-
going choice of glider speed as a function of current headwind compo-
nent, expected next climb quality and the influence of sinking air. The
XI speed (accelerate) system has a Speed Performance Indicator (SPI)
which helps the pilot make this choice of ideal speed-to-fly. Three posi-
tions
are indicated on the back of the rear risers: neutral/0 %, 50 %
and 100 %. Depending on the relevant parameters the chosen SPI po-
sition can be accurately set. A red marker on the front riser
serves
as an accelerate indication.
Info:
Thanks to its high stability the XI can be flown in accelera-
ted condition in light turbulence without problem. The choice of
accelerated speed for best glide does play an impor-
tant role for this high performance glider.
Each of the XI SPI positions has an icon with a value for headwind, ex-
pected climb and sink rate. These indicated positions are effective for
only one of their three values, taken in isolation – considered by itself.
This means that either the headwind, or the expected rate of climb, or
the sink rate applies to that position. The SPI principle is based on the
simple (using headwind and sink) and the extended (including expec-
ted climb rate) McCready Speed-To-Fly theory.
SPI at 0 %/ indicates neutral position (no accelerate).
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Содержание XI 21
Страница 1: ...Edition 1 08_2018 Manual...
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Страница 35: ...parts and dispose of the lines canopy and risers in a waste incinera tion plant 35...
Страница 41: ...Wing parts Winglet Upper surface Cleaning velcro Ribs Lower surface Air inlets Cells 41...
Страница 44: ...Instructions Bowline Knot 44...
Страница 45: ...Installation instructions Softlink 45...