Table of Contents
What is IGE and OGE in helicopter?
Performance Charts Every helicopter Pilot Operating Handbook (POH) has both In Ground Effect (IGE) and Out Of Ground Effect (OGE) hover charts. This allows the pilot to predict whether the helicopter will be capable of hovering OGE or not.
Why does it require more power to hover OGE than Ige?
gross weight, altitude, temperature, and power. The IGE hover ceiling is usually higher than the OGE hover ceiling because of the added lift benefit produced by ground effect.
Does pitch angle increase or decrease when going from an IGE to OGE hover?
The increased blade pitch angles create more drag. The greater blade pitch angle and increased drag cause a greater need for power to hover OGE vs IGE (AOA remains the same but Angle of Incidence changes due to the increase in Induced Flow OGE vs IGE).
What causes ground resonance in a helicopter?
Ground resonance is an imbalance in the rotation of a helicopter rotor when the blades become bunched up on one side of their rotational plane and cause an oscillation in phase with the frequency of the rocking of the helicopter on its landing gear.
What is Oge helicopter?
Out of Ground Effect
Out of Ground Effect (OGE) is the opposite to the above, where there are no hard surfaces for the downwash to react against. For example a helicopter hovering 150ft above the ocean surface will be in an OGE condition and will require more power to maintain a constant altitude than if it was hovering at 15ft.
What is transverse flow effect in helicopter?
Transverse flow effect is an aerodynamic effect encountered when a helicopter moves (typically forward) through the air. As the helicopter starts moving into undisturbed air, a portion of the disk is in clean, unaccelerated air, while the remaining portion of the rotor disk is still working on descending air.
What does hover ceiling Ige mean?
Ground Effect
In Ground Effect (IGE) is a condition where the downwash of air from the main rotor is able to react with a hard surface (the ground), and give a useful reaction to the helicopter in the form of more lift force available with less engine power required.
What is hover ceiling?
Highest altitude above sea level at which a helicopter can hover at maximum computed gross weight. It is generally specified whether the quoted hover ceiling refers to hovering in ground effect (HIGE) or hovering out of ground effect (HOGE).
How does density altitude affect helicopter performance?
If the pressure is lower, the air is less dense. This means a higher density altitude and less helicopter performance. Altitude – As altitude increases, the air becomes thinner or less dense. As warm air expands, the air molecules move further apart, creating less dense air.
Why do helicopters shake?
A helicopter main rotor is capable of producing vibrations in both the vertical and lateral planes. A vertical vibration is a result of unequal lift produced by the main rotor blades. This vibration is a result of the airframe rolling with the mass effect caused by the unequal vertical lift component.