The use of power for propeller systems and thrust for jets merely follows convention and also recognizes that for a jet, thrust is relatively constant with speed and for a prop, power is relatively invariant with speed. It is obvious that other throttle settings will give thrusts at any point below the 100% curves for thrust. Using the definition of the lift coefficient, \[C_{L}=\frac{L}{\frac{1}{2} \rho V_{\infty}^{2} S}\]. Often the equation above must be solved itteratively. For most aircraft use, we are most interested in the well behaved attached potential flow region (say +-8 deg or so). where e is unity for an ideal elliptical form of the lift distribution along the wings span and less than one for nonideal spanwise lift distributions. The rates of change of lift and drag with angle of attack (AoA) are called respectively the lift and drag coefficients C L and C D. The varying ratio of lift to drag with AoA is often plotted in terms of these coefficients. This page titled 4: Performance in Straight and Level Flight is shared under a CC BY 4.0 license and was authored, remixed, and/or curated by James F. Marchman (Virginia Tech Libraries' Open Education Initiative) via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request. This can be done rather simply by using the square root of the density ratio (sea level to altitude) as discussed earlier to convert the equivalent speeds to actual speeds. where q is a commonly used abbreviation for the dynamic pressure. Available from https://archive.org/details/4.10_20210805, Figure 4.11: Kindred Grey (2021). The lift coefficient relates the AOA to the lift force. Retrieved from https://archive.org/details/4.6_20210804, Figure 4.7: Kindred Grey (2021). CC BY 4.0. Shaft horsepower is the power transmitted through the crank or drive shaft to the propeller from the engine. The faster an aircraft flies, the lower the value of lift coefficient needed to give a lift equal to weight. Adapted from James F. Marchman (2004). Aerodynamics and Aircraft Performance (Marchman), { "00:_Front_Matter" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.
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