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Home > Plans > Contemporary
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Backdraft :: Lorenz Gubler
Download the print size image here.

Material: GFEC 3.2 (or 2.5 ?) mm

Distance: 110-160m

[1998] This shape is only slightly different from the Offspring. I swept the trailing arm more in forward direction, which reduces the "efficiency" of the wing, concomitant with a reduction of lift. The elbow and leading wing are identical to the Offspring in terms of shape. However, there is a more aggressive airfoil. The onset of the carving is so smooth that I could not draw helping lines. The wings are carved nearly symmetrical and the elbow is built for minimum drag. There was not much tuning necessary to obtain good flight behaviour, maybe a slight negative angle of attack on the trailing wing. Distance is 110 to 120 m, with negative angle of attack on the leading wing 130 m or more can be attained. Throw is 60° tilt angle and slightly upward. Especially if you have negative aoa on the leading wing you have to use maximum throwing power and rotation for stability.

We suggest trying 2.5 mm GFEC as well (which we didn't try yet). Performance might be improved due to a reduction of drag. A problem might be the insufficient stiffness and tendency to getting warped if you use thin GFEC, especially if the quality is inferior.

[2001] The Backdraft has been my favourite competition rang for 3 years. I attained a maximum distance of 149 m (Payerne 1999), in practice maybe 20 m more.
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