Launched in 2015, the Assen VTOL hoverbike program consists of two models, the A1 Explorer prototype and the in-development A2 Avenger. The A1 Explorer prototype is a small, electric ducted fan tri-copter eVTOL hoverbike that underwent its first flight test in September of 2018. The remotely-piloted test flight was untethered, with the A1 flying for a short period of time. Since then the hoverbike has been a big hit on the tradeshow circuit, including the EAA AirVenture event in Oshkosh, Wisconsin.