Lesson 6 Helicopter Performance (10/28/22)

Question 1

Hover has been tested up to, what conditions?

Answer 1

9,800 feet and 17 C

Question 2

Satisfactory engine cooling has been demonstrated up to what temperature?

Answer 2

38 C

Question 3

How much does adding carburetor heat reduce your hover altitudes?

Answer 3

Up to 2,000 feet

Question 4

What are the two main reasons why IGE requires less power?

Answer 4

Reduction of induced flow in ground effect hover (Think coffee cup)
Wing tip vortices are reduced in ground effect hover

Question 5

Why does induced flow reduce lift?

Answer 5

The faster air is descending the less a rotor is able to hit the air (think tennis ball falling) and produce lift.

Question 6

Out of ground effect what happens to induced flow and angle of attack?
In of ground effect what happens to induced flow and angle of attack?

Answer 6

OGE: Increased induced flow, decreased AOA
OGE: Decreased induced flow, increased AOA