2-Phase Speed System with SPI
The Speed Performance Indicator (SPI)
helps you choose your speedbar position.
In accelerated flight it indicates your relati
onship to the accelerated part of the wing’s
polar curve, and confirms symmetrical
application.
Spend some time setting up your speedbar
lines correctly:
1
Set their lengths so that the first speed
bar step gives you the 40 % position on
the SPI, and the second step reaches
80 % SPI. With this configuration you
should be able to reach 100% (pulley
to pulley) with toes at full stretch on the
second step.
2
By moving the knots
and therefore
the ball position
on the risers you
can adjust the ratio change position to
suit your leg and body length.
+
Pic 1 shows low gear – 3:1, and Pic 2
shows high gear – 2:1
Summary of Contents for SIGMA 10
Page 1: ...Getting started english ...
Page 3: ......