In a Climb Lift is less than the Weight.
Thrust is more than Drag.
VX– Best Angle of Climb speed, It gives the maximum height gained over the horizontal distance traveled.
It gives Flight path gradient.
VY– Best Rate of Climb speed, It gives the maximum height gained in a unit time.
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VX — Also known as Maximum Gradient Speed. VY – Also known as Maximum Rate Climb Speed. ————————————- Climb Gradient is worked out by True Air Speed and Rate of Climb Flight Path Gradient is worked out by Ground Speed and Rate of Climb ——————————— :: Angle of Climb is governed by Thrust. :: Rate of Climb is governed by Power. |
We climb at cruise climb speed, which is more then best rate of climb speed for better cooling of the engine.
Factors affecting Climb:-
1. Weight – Weight increases rate of climb decreases, because power required to maintain the level flight increases and excess power is less.
2. Temperature – Temperature increases, power output decreases and power required increases therefore rate of climb decreases, In summer rate of climb decreases.
3. Altitude – Altitude increases, power output decreases, power required increases therefore Rate of climb decreases.
Service Ceiling – Altitude where Rate of climb drops to 100 feet per minute.
Absolute Ceiling – Altitude where Rate of climb drops to 0 feet per minute.
With increase in altitude range of minimum and maximum speed at which level flight can be maintained continues to decrease.
Drift Down Altitude – Altitude that a multi engine a/c can descend to and maintain in case of a engine failure during cruise.
It depend upon
(a) All up Weight of a/c
(b) Temperature conditions.
Angle of climb is governed by Thrust.
Rate of climb is governed by Power.
Velocity of min power (Vmp) is lightly less than (Vmd)
There are no wing tip vortices or Induced drag in ground effects.
4. Flaps – Flaps causes more drag therefore, power required increases, power available decreases.
Therefore rate of climb decreases and angle of climb decreases.
If rate of climb decreases angle of climb will also decrease but vice versa is not true.
If angle of climb changes rate of climb may or may not change.
5. Density altitude effects climb performance of a/c.
Duplicate Inspection is required for any work done on engine controls and control cables.
Service ceiling – for a Jet engine is altitude where rate of climb drops to 500 feet per minute.