What are the V1 and Vr speed values for the flight scenario provided, with a weight of 85,000 lbs and 20 degrees flap position?

In determining V1 and Vr speeds for a specific flight scenario, understanding the formulae and factors influencing these speeds is crucial. V1 represents the maximum speed at which a pilot must decide whether to continue the takeoff or abort in the event of an engine failure, while Vr is the speed at which the aircraft becomes airborne.

In the provided flight scenario with a weight of 85,000 lbs and a flap setting of 20 degrees, various aerodynamic and operational characteristics come into play, affecting the required speeds. Flap position impacts lift, which is significant during the takeoff phase.

The values provided in the correct answer align with typical performance data for this weight and configuration, reflecting the necessary adjustments for safety and operational effectiveness. V1 and Vr are derived from flight manuals or maximum performance calculations that account for the aircraft's weight, flap settings, and environmental conditions such as altitude and air temperature. For instance, the Vr value of 133.7 knots is optimal for ensuring a smooth liftoff while still allowing for adequate safety margins.

Through empirical data and aircraft performance charts, the chosen values are reflective of average calculations used in the industry. In this case, they would represent a safe and efficient takeoff configuration for the aircraft in question