Advance acoustic EPSILON 9 시작하기 - 페이지 6

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Speed system with SPI

The Speed Performance Indicator ( SPI )

uses the EPSILON 9 polar curve and the

MacCready theory, and tells you the best

speed to fly. The SPI gives you an indica-

tion of the speed increase to choose tak-

ing into account headwind, sinking air and

the expected quality of the next thermal.

Take the time to set up your speed system.

Make sure that the speed lines run

freely through the harness pulleys.

Pull the speedlines through the harness

and connect them to the glider risers

using the Brummel hooks.

Adjust the length of the speed lines so

that pushing the first and second speed

bar steps reach SPI position 1 ( 30%)

and position 2 ( 80%) respectively.