Waco,
I am not sure if it received the Approved Type Certificate, or not. I do know that they sold four of the KN-1's before going under due to the Great Depression. If you run across anything let me know! I have a request to the Smithsonian but what I gathered from another volunteer is they don't have much info on the Knoll. I have a few magazine advertisements, though the best one is very grainy.
Shame that a crashed one sat derelict aside a Mexican air force base until as recently as three years ago when they burned and recycled what was left of it
Aero Digest boxes and did not see those issues. I DO have large bound volumes of Aero Digest in the library and it takes four large volumes just to bind the 1929 issues. Found the bound volume of AD for April/May/June 1929, and it is about 800 pages of fabulous stuff from rare & oddball aircraft to every engine & accessory, plus fantastic full page photo ads etc. profusely illustrated. Nearly 300 pages per month. I sure do not want to break up a set of these. But if you know what pages you are looking for, let me know and I'll see if can get the volume onto the scanner, or take a decent photo of it/them with the camera for you. If you don't know the pages, I'll have to go through about 600 or so pages, but will enjoy it! I haven't looked at these for some time, and forgot how great they are/were. I would consider selling (either) ALL of the bound, or all of the loose issues of Aero Digest, (1920s-1940s, loose issues)if anyone is seriously interested. Bound volumes are only from 1929-38 and missing some years. Will be parting with LOTS of similar years & aero titles (including foreign titles) in long runs, if anyone is looking for collections/sets. A LOT of these magazines ran aircraft & engine reports in series, in several successive issues...
