Chp. 11 Airframe Performance

Indicated airspeed (ISA) is:

• Dynamic pressure indicator 

• Speed indicating aerodynamic performance 

Indicated airspeed (ISA) demonstrates:

Quality of airspeed depends on ISA

Calibrated Airspeed (CAS)

Compensates for IAS errors

Used by manufacturer in performance data

(IAS should be close to CAS)

True Airspeed (TAS) is:

the true speed you’re going in the air

What happens to TSA higher in the air?

Higher in air less accurate because of less air

What must you do when you’re increasing in altitude and holding constant ISA?

must move faster in air to maintain

Ground speed

How does icing occur in engine?

Engine venturi allows faster velocity and loses heat causing icing

Vx means:

Best angle

Vx does:

• Used for takeoff

• Stepper pitch slower

Vx is best for:

Used for takeoff and clearing objects

VX is best used for:

the greatest gain in height in the shortest distance over the ground

Vy means:

Best rate

Vy does:

Greatest gain of height in the shortest amount of time (rate is time)

Vy is best used for:

reaching cruising altitude faster (safer and efficient)

How to find crosswinds?

Subtract runway degree with crosswind

find the cross wind:

Two ways of finding density altitude:

set altimeter to standard altitude (29.92hg, 15C, 59F MSL) and get altitude

use E6-B flight computer

watch E6B flight computer tort

watch crosswind computer tort