Identity Needed Biplane Photo

[Stig Jarlevik]

Well Clint, your questions are a bit tricky to answer since very little details are to be found in my reference literature.

The so called armor, was in fact stiff canvas and as far as I can read it never got anywhere close to getting any real armor.

In all honesty I cannot remember the US Army giving out such a specification as for an armored aircraft, but then again I am not specialised in the US Signal Corps activities so it may have slipped my memory (quite common these days I might add....)

The T stood only for tractor, plain and simple, and to me it seems Martin used it for whatever tractor aircraft he built back then.
As I said I am simply quoting what my meager sources state. There were seven of them in total, and this was one of them.

It also seems his designation system was very simple.
T = Tractor
TA = Tractor Army
TT = Tractor Training
S = Seaplane
R = Reconnaissance
GMB = Glenn Martin Bomber
MB = Martin Bomber

Not sure if this answer your questions, but I simply don't know anything more.

Cheers
Stig