Oddball Evil bay score

The instructions on the ebay listing say that you can control it in a circle, stunt, land etc. Anyone know how it's controlled?

that's a typo...it's a free flight. The box uses the same printing as the C/L models, apparently nobody thought to change it. However it could also be tethered by tying a string around tank collar.

Inventor of this interesting model is John W. McRoskey. It's patent here:
https://patents.google.com/patent/US2949693

Download pdf:
https://patentimages.storage.googleapis.com/74/47/ee/dee7e49481ac2a/US2949693.pdf

Thanks everybody for all the archival research work. I guess I'll just clean the exterior of this item up, lube it good, print copies of the archives y'all have provided and box it all up for a time capsule. I got the thing for $14.80 postage incl. from San Francisco. I guess someone was desperate for rent money or something.

The marketing people at Wen Mac sure made some wild-ass claims about this thing and how "anyone" could get it into the air in two minutes and telling dealers to "buy 'em by the gross". When I was in the toy and hobby business, I met all kinds of folks who couldn't even get in out of the rain in under two minutes, kids who could destroy an anvil with a box of toothpicks and dads would take anvils back to the hardware store demanding a refund-- you name it.