I have taken a lot of pictures of this aircraft. While at the museum where it lives, a volunteer showed me the details of the rotary engine. Thank you, it was very interesting. He also claimed that the Nielsen & Winther Type Aa is a clone of the Nieuport 17. I have not looked into that claim any further, but it looks at least partially correct. Comparing the two, the fuselage looks similar, but the engine cowl definitely does not.