The Adam A500 is a unique and innovative aircraft characterized by its unusual twin-boom configuration and centerline thrust design, where both engines are mounted on the centerline of the aircraft, one pushing from the rear and one pulling from the front.

Here are some of its key features and specifications:

1. Design: The aircraft has a pressurized cabin and utilizes a carbon fiber composite structure which is lighter and stronger than conventional aluminum construction.

2. Configuration: The twin-boom layout provides several advantages including reduced aerodynamic interference between the fuselages, and props, and potentially increased safety in the event of a single-engine failure due to the aligned thrust.

3. Engine: Equipped with two Continental TSIO-550-E piston engines, each producing 350 horsepower, the A500 is designed to be fuel-efficient and provide a comfortable cruising speed.

4. Performance: Typically, the A500 could cruise at speeds around 220 knots, with a range of around 1,000 nautical miles, and a service ceiling of approximately 25,000 feet.

5. Cockpit and Avionics: The cockpit was designed with ergonomics in mind, aimed at reducing pilot workload. It included advanced avionics for its time, with the intention of making information management and flight operations more efficient.

6. Passenger Comfort: The A500's cabin was designed to seat six including the pilot, offering comparative comfort and space in the general aviation category.

The Adam A500 made its first flight in July 2002, but the development was fraught with challenges. Adam Aircraft Industries filed for bankruptcy in 2008, and only a small number of A500s were ever produced, making it a rare and intriguing aircraft in the world of aviation.