ESDU 80020
Average downwash at the tailplane at low angles of attack and subsonic speeds.
Abstract:
ESDU 80020 contains a simple method for estimating the average downwash angle at the tailplane for subsonic speeds and low angles of attack where the lift, pitching moment and downwash characteristics are linear, i.e. where the flow is wholly attached. The method, which is semi-empirical, is a first order one allowing for the major effects of wing planform, body, wing-body interference and tailplane height. Moderate amounts of wing twist are acceptable in the method. The method applies only to wing-body-tail combinations although some assessment of the effect of rear-fuselage mounted nacelles is given. A computer program of the method is provided as ESDUpac A8020. ESDU 97021 provides a method for estimating the effect of flap deployment on the average downwash angle at the tailplane low speeds.Indexed under:
Details:
Data Item ESDU 80020 | |
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This Data Item is complemented by the following software:
Name | Details | ||||
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ESDUpac A8020 |
This program is only available to subscribers. |
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This Data Item contains 26 interactive graph(s) as listed below.
Graph | Title |
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Figure 1a | Downwash parameter at an infinite distance downstream. λ = 0 |
Figure 1b | Downwash parameter at an infinite distance downstream. λ = 0.25 |
Figure 1c | Downwash parameter at an infinite distance downstream. λ = 0.5 |
Figure 1d | Downwash parameter at an infinite distance downstream. λ = 1.0 |
Figure 2 | Downwash parameter for elliptical loading |
Figure 3 | Correction to downwash parameter |
Figure 4a | Factor for average downwash across tailplane: A tan Λ1/2 = 0. λ = 0 |
Figure 4b | Factor for average downwash across tailplane: A tan Λ1/2 = 0. λ = 0.25 |
Figure 4c | Factor for average downwash across tailplane: A tan Λ1/2 = 0. λ = 0.5 |
Figure 4d | Factor for average downwash across tailplane: A tan Λ1/2 = 0. λ = 1.0 |
Figure 5a | Factor for average downwash across tailplane: A tan Λ1/2 = 2. λ = 0 |
Figure 5b | Factor for average downwash across tailplane: A tan Λ1/2 = 2. λ = 0.25 |
Figure 5c | Factor for average downwash across tailplane: A tan Λ1/2 = 2. λ = 0.5 |
Figure 5d | Factor for average downwash across tailplane: A tan Λ1/2 = 2. λ = 1.0 |
Figure 6a | Factor for average downwash across tailplane: A tan Λ1/2 = 4. λ = 0 |
Figure 6b | Factor for average downwash across tailplane: A tan Λ1/2 = 4. λ = 0.25 |
Figure 6c | Factor for average downwash across tailplane: A tan Λ1/2 = 4. λ = 0.5 |
Figure 6d | Factor for average downwash across tailplane: A tan Λ1/2 = 4. λ = 1.0 |
Figure 7a | Factor for average downwash across tailplane: A tan Λ1/2 = 6. λ = 0 |
Figure 7b | Factor for average downwash across tailplane: A tan Λ1/2 = 6. λ = 0.25 |
Figure 7c | Factor for average downwash across tailplane: A tan Λ1/2 = 6. λ = 0.5 |
Figure 7d | Factor for average downwash across tailplane: A tan Λ1/2 = 6. λ = 1.0 |
Figure 8 | Effect of body |
Figure 9 | Effect on tailplane height |
Figure 10 | Downwash at zero lift |
Figure 11 | Mach number effect |