Using the takeoff speeds chart, determine the V1 speed, given the following conditions: Temperature 20 deg C, pressure altitude = 2000', weight = 17000lbs, Anti ice off, 10kt Headwind, 1% upslope.

• A. 108 kts
• B. 112 kts
• C. 114 kts
• D. 118 kts

Answer: (A)

V1 is the speed at which you must decide to continue the takeoff or abort, and it’s set so you can stop within the available runway if you choose to abort. The value depends on how the runway length, aircraft weight, density altitude, wind, slope, and anti-ice state affect both the accelerating/abort decision and the stopping capability.

Here, the weight of 17,000 lb demands more runway and tends to push V1 upward. The temperature of 20 C at a 2,000 ft pressure altitude creates a density altitude higher than the actual altitude, reducing engine and wing performance and also pushing V1 higher. A 10 kt headwind helps by reducing the ground roll and thus the distance needed to stop, effectively allowing a higher V1. The 1% upslope works against you by increasing the takeoff distance, which tends to lower V1. With anti-ice off (no extra drag/weight from anti-ice systems), performance improves a bit, nudging V1 downward.

When these effects are balanced on the takeoff speeds chart for these inputs, the V1 that satisfies the performance/readiness criteria comes out around 108 knots. That’s why 108 kts is the best choice among the options.