In low-speed flight, it is the speed which would be shown by an airspeed indicator with zero error.
The aircraft's wing design made it ideal for long-duration, low-speed flight, ideal for aerial photography and survey work.
That radiator was retractable and intended for use only during ground-running or low-speed flight.
During that flight, the landing gear did not retract, and LeVier landed after a low-speed flight of about 20 minutes.
As the airspeed bled off I let the aircraft roll slowly toward the horizon in low-speed flight.
The airfoil is a Wortmann FX-MS-150-B, which was developed for low-speed flight.
The surface is typically retractable at high speed and is deployed only for low-speed flight.
The Q1W carried two low-power engines, allowing for long periods of low-speed flight, and was the first purpose-designed anti-submarine warfare aircraft in the world.
While conducting a planned test of low-speed flight at low altitude, the aircraft was descending through 3000 feet on full autopilot for a go-around.
For low-speed flight and landing, the rotor drive system was restarted to provide hovering capability.