I am normally not in favour of complicated mechanisms and hence normally use a simple cable mechanism to close the top cowl flaps. If one wants to adjust the amount of opening of the top cowl flaps in flight though - quite a bit of force is required to overcome the aerodynamic loads on the flaps hence I am trying an electro mechanical setup. I hope to be able to close them partially in flight. Whether or not the system works remains to be seen - watch this space! Oh and if the electrics fail I have a cord that I can pull in the cockpit which disengages one of the ball ends connected to the cowl flaps thereby opening one of them in an emergency.
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