This model represents the functioning cowl flaps on early Vought F4u Corsairs (non-D or later), but could be modified to work for D and later models. The original design set the flaps in the open position via springs using the airflow over the fuselage to close the flaps in flight. There are servo driven parts included for those more adventurous. Included are instructions and pictures in a PDF file.
The author marked this model as their own original creation.