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Astrir turbulator tapes
Hi Ruediger,
there is a drawing from Grob, specifying the turbulator location for the single-seaters as follows (distances measured on the pressure side of the wing from the trailing edge to the trailing edge of the tape): Wing root: 360mm Inboard end of the aileron: 300mm Wing tip: 178mm Twin I and II twoseaters receive the tape only at the ailerons with the following dimensions: 4300mm from the wing tip: 380mm Inboard end of the aileron: 370mm Wing tip: 208mm Unfortunately, these locations are not included in the service letters from LTB Lindner. The tapes do not significantly improve the performance - perhaps 1 or 2 points, you won't notice that. But they remove the seperation bubble from the ailerons and improve the airflow there. You will notice that the glider becomes more stable in a turn. You will also need less aileron input for corrections and the aileron in general is a bit more responsive. Best Christoph |
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Astrir turbulator tapes
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#3
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Astrir turbulator tapes
Hi Michael,
indeed, SL12 includes a reference to turbulator tape in front of the control surfaces. Especially in case of the rudder, this helps to reduce the lack of rudder authority that most Astir. Turbulators on the suction side in front of the ailerons also seem to improve aileron authority on some gliders, like the ASK21. However, the drawing that Grob released in the 80s and which the Aerokurier article refers to, includes additional specifications for turbulator tape on the pressure side of the Eppler airfoil. These are not part of SL12. When following these instructions, the tape will not be right in front of the aileron gap as shown in SL12. It will be a few centimetres further upstream.. Regards Christoph |
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Astrir turbulator tapes
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