My dear Justo
The martin model 179 was the B.26.
I see somewhere one of the first studies with a twin fin.
but I have no detail.
Here you show another model 179 ? Are you sure, as if I
look at the low right corner of your document I read "189"
Nevertheless this is very interesting for me as I know this
Plane ( a very little image) but no detail.
Thank you if you could tell me