I have a photocopy of an "Instruction Manual" dated June, 1946, for my Oct. 1946 Ercoupe. I gave John at Skyport a copy of it. The first 21 of its 35 pages are (I think) the closest thing to a POH that we have; the rest of the pages are dealers' addresses.
Linda
N3437H ("Sky Sprite")
Ercoupe 415-C
Los Angeles
