Mad Propz (or Madd Propz) is a Hot Wheels casting designed by Steve Moran based on a racing propeller airplane. It was first to be named the Air Hammer as seen in the above picture on the wing, but was changed before the production process. Mad Propz debuted in the 2004 Hot Wheels line as part of the First Editions.The tool was called "Madd Propz" until 2007, when it was renamed "Mad Propz" after a complaint from MADD (Mothers Against Drunk Driving).In 2013, this casting was retooled, with the cockpit and rear wheel now being a part of the engine. The casting was retooled again in 2019, with the base now covering the exposed wheel axles.

[Taken from Fandom]