Curtiss YP-37 with the R-2600 Radial Engine

Reviewing the original P-36/YP-37/P-40 blueprints published by AirCorps Library, I also browsed the “uncategorized drawings” category. In general, many Curtiss drawings from this microfilm set are unreadable, especially these “uncategorized” images. Often all what you can see is just a blank microfilm frame with barely visible remains of the title block. However, in this “junk” category you can find interesting sketches of various design proposals. One of them is the YP-37 with the powerful R-2600 Twin Cyclone engine. Below you can see side view of the initial idea, from November 1938:

Figure 106-1 YP-37 with R-2600 engine: initial proposal from November 1938 (a fragment of drawing P-1660)