Advance acoustic IOTA DLS, Product Manual

Leave the IOTA DLS in its factory settings. The brake line lengths have been set for optimal handling, as established 
by our test team. The free travel of the brake lines makes sure that the trailing edge remains unbraked during 
takeoff, in fully accelerated flight and when using the C handles.

Info

We recommend a bowline knot for attaching the handles.

3.3. Speedsystem

Speed Performance Indicator (SPI)

Optimal cross country glide between two thermals requires an on-going choice of glider speed as a function of 
current headwind component, expected next climb quality and the influence of sinking air. The IOTA DLS speed 
(accelerate) system has a Speed Performance Indicator (SPI) which helps the pilot make this choice of ideal speed-
to-fly. Three positions are indicated on the back of the rear risers: neutral/0 %, 50 % and 100 %. Depending on the 
relevant parameters the chosen SPI position can be accurately set. Red tabs on the front risers  indicate the 
selected position relative to the SPI markings.

Info

Thanks to its high stability the IOTA DLS can be flown in accelerated condition in light 
turbulence without problem. The choice of accelerated speed for best glide does play an 
important role for this high performance glider.

Each of the IOTA DLS 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 – 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 expected climb rate) 
McCready Speed-To-Fly theory

Warning

Even though the IOTA DLS has a high degree of stability in accelerated flight you should 
only use as much speedbar as you feel comfortable with.

Info

Although flying into a headwind (15-20 km/h) gives you the feeling that your gliding 
performance is being badly affected, bear in mind that strong sink (more than 2 m/s) has a 
relatively stronger adverse affect.

Setting up the speed system

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