If you go to the following URL you can see a 1956 photo showing the remains of a pretty unique round concrete airfield. This was the Sheep Ranch OLF of NAS
I concur Dave. The principal training aircraft used as NAS Bunker Hill was the N2T Tudor primary trainer (made by Timm Aircraft Corp., Van Nuys, CA). Here is
When considering the octagon landing fields, there are several things that need to be understood: 1.) 1700'-1800' is more than adequate for the Navy trainers