The T-40 prototype has gone through many modifications, from a single-place airplane to a well equipped, comfortable, two-place, fast cross country airplane. Modifications are always made with the goal of making the planes more efficient and easier to fly. In one configuration the airplane had a T-tail, full-span flaps, spoilers, leading edge slats, and "buggy whip" landing gear. Later a canard was also installed. The canard version made only one hair raising flight then it was converted back to the T-40A/B configuration. At one time the airplane incorporated so many changes, the FAA required the airplane to carry a new model designation, T-77. Another modification was made requiring the designation, T-77A, a wide single-place version with a T-40 style canopy and tricycle landing gear. Cruise speed with a 150 hp Lycoming was 165 mph (145 knots). For pictures of the various Models of the T-40/T-77 airplanes see Section T-40 Photos.
Model T-100D, MARIAH
In 1982 Turner Aircraft ventured into the ultralight aircraft arena with Model T-100 called Mariah. Mariah was a light weight airplane designed to meet the needs of pilots who want to fly, but had no FAA flight physical or who could not afford to fly certificated airplanes. The T-100D was designed to meet the requirements of FAR 103, Ultralight Airplanes. The airplane had twin tails, pusher engine, three-axis conventional flight controls, tricycle landing gear, steerable nose wheel, and an enclosed cabin. Although the airplane met the design criteria and was very stable, the drawings were taken off the market due to the liability insurance problems.
Surprise, in 2007 a surge of renewed enthusiasm came to life for the design spear headed by engineer who is employed by Lockheed Martin, Marietta, Georgia. As a result Gene sold the design and manufacturing rights to Kenneth Adams of Adams Aviation of Dallas. Georgia.
FAA's FAR 23.337, Load Factors:
Models: T-40, T-40A, T-40AS
FAR 23.561, Emergency Landing Conditions
FAA FAR 23.337, Limit Maneuvering Load Factor X1.5 safety factor = Ultimate load:
NOTE: Performance figures based on the following: T-40 with conventional landing gear, T-40A with conventional landing gear and 125 hp engine, and the Super T-40A (Bubble canopy) with tricycle landing gear and 150 hp engine.