What is the minimum rate of climb required for takeoff on RWY 9 with a groundspeed of 140 knots?

To determine the minimum rate of climb required for takeoff at a groundspeed of 140 knots on RWY 9, it's essential to utilize the standard climb gradient calculations that apply during takeoff scenarios.

The relationship between groundspeed and the rate of climb can be evaluated using the formula:

Rate of Climb (in feet per minute) = Grounds speed (in knots) × 10% of the groundspeed.

First, calculate 10% of the groundspeed. For a groundspeed of 140 knots:

10% of 140 knots = 14 knots.

To convert knots to feet per minute, knowing that 1 knot is equivalent to 100 nautical feet per minute:

14 knots * 100 = 1,400 feet per minute.

However, to find the required minimum rate of climb for safe operations during takeoff, a typical safety factor is applied, often resulting in using a fraction of the direct conversion rate, commonly around 70% of the calculated climb.

This means we take the rate of 1,400 feet per minute and find 70% of that:

0.7 × 1,400 = 980 feet per minute.

This value is often rounded to the nearest significant number, which