In article ,
Chris Wells wrote:

I recently visited the Niagara Aerospace Museum (thumbs up!) and got the
opportunity to see a P39 Airacobra close-up...and I noticed that the
elevator and ailerons (& possibly the rudder as well) were
fabric-covered, instead of aluminum like the rest of the plane. Is this
the way they were built?

Yup. The P-51 also had a fabric-covered rudder; early-model Corsairs had
a fair amount of fabric on the wings, too.