Speed System With Spi - Advance acoustic IOTA 23 User Manual

Example IOTA / 26
Position neutral
Position 30%
Position 80%

Speed system with SPI

The I OTA has a speed system with a Speed-Performance-Indicator
( SPI ), which reads off against 3 positions on the backs of the risers .
The red markers on the speed system enable a precise speed bar po-
sition to be set to suit the in-flight situation .
Best gliding to the next thermal needs an on-going choice of speed to
fly, depending on the current values of headwind, expected next climb
rate, and the rate of sink .
Thanks to its high stability the I OTA can be flown fully accelerated in
light turbulence without problem . The choice of accelerated speed for
best glide does play an important role for this high performance glider .
For simplicity the I OTA's SPI positions are each indicated by a picture
showing the degree of headwind, expected next climb rate and current
sink speed . Each of the I OTA SPI positions has an icon with a value
for headwind, expected climb and sink rate . These indicated positions
are effective for only one of their three values, taken in isolation – con-
sidered 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 expected climb rate ) McReady Speed-To-Fly theory .
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