Lockheed thought it so important to the proper functioning
of the P38 rad cowl flap that they sealed it inside along it's leading
edgewith a strip of white canvas. Note the aft outlet end of
the boundary layer air bleed system. Obviously they spent a lot
of time measuring pressures.

The whole cooling and air intake system shows extreme care with its
design, development and fabrication. These pictures were taken in
the Tilamook blimp hangar museum. 

Paul Lamar
 
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