Not much going on...
1. Single engine
2. Single seat
3. Unarmed as it was test flown
4. It would qualify as a LSA by today's standards.
5. Subsonic....duh
6. This airplane and another were in competition and neither one proved satisfactory for its intended use.
7. The Germans were slightly more successful using the concept in WW2
8. 3 and 5 cly radial engines were tested on the airplane
9. The plane in question was all metal.
10. The plane in competition with it was more conventional fabric construction.
11. Only 6 were built as well as the competition airplane had 6 built.
Sparky