Contents
What factors affect VMCG?
The major factor that affects VMCG is the difference in engine thrust. VMCG will therefore be lower at higher airport elevations and at higher OAT, due to the associated lower thrust. In certain cases, a lower VMCG can be obtained by taking nosewheel steering into account.
What is a consequence of a CG which is too far aft?
If the CG is too far aft, it will be too near the center of lift and the airplane will be unstable, and difficult to recover from a stall. If the unstable airplane should ever enter a spin, the spin could become flat and recovery would be difficult or impossible.
How is VMCG determined?
A method to calculate VMCG based on mathematical simulation is provided. All forces and moments act on the aircraft in the takeoff run are considered in this method. Based on this method, VMCG is obtained through the mathematical simulation of the takeoff run of an aircraft after the critical engine is failed.
How does the position of the CG affect VMC?
Factors affecting Vmc is the position of the CG as this affects the length of the moment arm for the rudder to counteract the vertical moment caused by the asymmetric thrust loading as a consequence of a critical engine failure. Aft most CG is the worst case.
How does forward and aft CG affect aircraft performance?
Forward Vs. Aft CG The relationship between aircraft performance and CG location is simple: by moving the CG forward and aft, you change the amount of tail down force and lift you need for stable flight. If you need more lift, you create more induced drag, and your performance goes down. But why are lift and CG located related?
When does a CG have the highest V Mc?
V mc is greatest when the CG is at the most aft position. An aft CG shortens the arm to the center of the rudder’s horizontal lift, which means a higher airspeed would be required to counteract the engine-out yaw. So the aft CG has the highest V mc and a forward CG would decrease V mc.
Where is the center of lift on a CG?
The center of lift is aft of the center of gravity for the entire approved CG Range. Factors affecting Vmc is the position of the CG as this affects the length of the moment arm for the rudder to counteract the vertical moment caused by the asymmetric thrust loading as a consequence of a critical engine failure.