Both of these were drawn by me, probably around 1988 or 1989, and were done as concepts for vehicles in the Playmates Toys TMNT line. The top drawing is of a TMNT helicopter, and one of its interesting features is the lineup of various "landing grippers" -- magnet, suction cup, and velcro -- that would attach to its landing skids. We had considered -- and I think I even did a sketch of it -- making these into accessories for the Turtle figures also, so that they could be stuck to many different surfaces.
The Troop Carrier was intended as a vehicle for the evil Foot Clan to use (I think that's a proto-Bebop at the controls). I think I was inspired by the cool design of the APC in the movie ALIENS. -- PL