Airborne Windmills and Communication Aerostats
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to the onset of static stall, as = 11°. It is interesting to note that the unslotted airfoil had a more severe decrease in Vf with increasing a0 than the slotted airfoil, for ot0<cxs. The slotted airfoil shows a more drastic reduction in Vf than the unslotted airfoil, as a0 passes through and above as. The slot's effect on the flowfield causing the increased Vf, or its effects on airfoil efficiency are not known at this time. However, the data presented in this Note does demonstrate that passive flutter suppression is possible.
[1] P. Daniels. Fin slots vs roll lock-in and roll speed-up. , 1967 .