Thank you, Terry, for the translation and 3-view and Jemiba for the inboard profile. Being a lifelong student of aircraft design, both bring up more questions than answers. I am always curious, in cases like this, as to why the designer laid the airplane out as he or she did, even if it is based on 80-year-past reasoning. Did this airplane ever fly? For an undercarriage test aircraft, why did the designer place the pilot in a position which would make landing the airplane accurately, more difficult. Was Lindberg's location in the Ryan N-Y-P an influence? Why would drag reduction be a consideration in such a test aircraft? I don't expect answers here, but one never knows.
I question some of the details in the 3-view. It shows apparent exhaust ports on the left side of the engine cowling, but the forward left-quarter picture in the accompanying article does not. I would expect the exhaust on an inline six to be on only one side. Are the ailerons really that large? Do they droop on landing to increase the lift coefficient of an, apparently, highly loaded wing? The balancing skids at mid-span appear to fold upon retraction. Do they really lie on the narrow chord ahead of the aileron hinge line or do they trail aft dividing the trailing edge into an inboard flap section and an outboard aileron?