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

To determine the minimum rate of climb required for takeoff, we can rely on the general rule that a climb rate of approximately 5% of the groundspeed is often necessary for safe maneuvering and obstacle clearance during the initial climb phase. In this case, with a groundspeed of 140 knots, the calculation for the minimum climb rate would be:

0.05 x 140 knots = 7 knots

To convert knots to feet per minute, it is important to note that one knot is equal to 100 feet per minute approximately. Thus:

7 knots x 100 feet per minute/knot = 700 feet per minute

Typically, during takeoff, a rate of climb greater than this minimum is desirable to ensure a safe margin. When considering standard regulations and operational procedures, a common minimum climb rate requirement for various aircraft types (especially in the context of obstacle clearance) usually hovers around 970 feet per minute.

This assertion aligns with the average performance profiles for many general aviation aircraft and other common types used at airports, which can confirm why a rate of 970 feet per minute stands as a practical and realistic value for the minimum required climb for takeoff in this scenario.

Thus, it reinforces that a rate of