Please help identify this plane
First, I hope this is an appropriate forum for this post, if not then I apologize and please let me know where it should go.
Recently I purchased some planes that had belonged to the seller's father. Among the planes was this one, it is just the airframe; radio, engine, and tank have been removed. Can anyone identify what this plane is? What is the purpose of the wing "vents" in front of the ailerons? If the photos look odd it may be because the plane is hanging upside down on the ceiling of my garage, and I rotated the photos 180 degrees.
WIngspan: 64"
Length: 48"
Wing covering is Monocote or some sort of plastic Cote. The fuselage is covered with fabric/dope.
Any help will be appreciated!
Glenn