The development of a controllable rubber trailing edge flap (CRTEF) for a wind turbine blade is presented in the paper. The flap can be deflected by controlling the pressure in suitable designed reinforced voids within the elastic flap. As the basic design is simple without any moving mechanical parts it is expected that a robust flap system can be achieved. A number of prototypes with a chord of 150 mm have been manufactured and tested showing a maximum deflection of ± 12 mm for a pressure of ± 8 bar. Six of these prototypes were glued together and mounted on a 1.9 m long airfoil section model with a chord of 1 m for test in a wind tunnel. A maximum delta C_L of about 0.2 was measured in the wind tunnel tests and a time constant around 80 ms. The potential load reduction on a MW turbine is presented based on aeroelastic simulations and using the wind tunnel test results of the flap characteristics.
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