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What is CL Max in aerodynamics?
Originally Answered: what is Cl max for an aircraft ? It is the maximum value of the lift coefficient where the lift increase with the angle of attack. Beyond Cl max, the aircraft will stall.
How is stall calculated?
Stall Speed Example
- First, determine the lift force. Measure the total force of lift.
- Next, determine air density. Calculate the density of the air at altitude.
- Next, determine the surface area. Calculate the surface area of the wings.
- Next, determine the coefficient of lift.
- Finally, calculate the stall speed.
What happens when CL Max is exceeded?
This peak is called the CL-MAX. The amount of lift the wing produces drops dramatically after exceeding the CL-MAX or critical AOA, but as stated above, it does not completely stop producing lift. The wing never completely stops producing lift in a stalled condition. If it did, the aircraft would fall to the Earth.
How is CL Max calculated?
You can measure Cl mathematically at slow speeds under sea level conditions using the equation 2 times pi (3.14159) multiplied by the angle between the mid-line of the wing and the relative wind. However, Cl is typically determined through wind tunnel tests where the velocity, density and area can be controlled.
How to calculate the stall speed of an aircraft?
This equation can be used to compute stall speed at a particular aircraft weight, when you know only stall speed at some other aircraft weight: W_2 / W_1 = (v_stall_2 / v_stall_1)^2, and thus we get (call it “Equation V1V2”):
How does the stall speed increase with weight?
1. Stall speed increase for higher weight = old speed + 1/2 % increase in weight e.g. wt inc. 20% stall speed inc. 10% therefore if old speed is 100 kts new speed is 110 kts.
How to calculate stall speed in 60 degree AOB?
Stall speed inc. in turn = old speed x square root of load factor e.g. in 60 degree AOB turn load factor is 2, root of 2 = 1.414, if old speed is 100 kts new speed is 141.4 kts. 3. Stall speed increases if load factor increases, decreases if load factor decreases.
How does the position of the CG affect the stall speed?
The position of the CG also affects the stall speed. Assume an aircraft with a Centre of pressure behind the CG. A shift of CG to forward, will increase the magnitude of the Lift-Weight couple, which pitches the nose of the aircraft down.