ESDU 96012
Subsonic and transonic base and boattail pressure drag of cylindrical bodies with circulararc boattails
Abstract:
ESDU 96012 provides an empirical graphical method derived from a correlation of windtunnel data for the prediction separately of boattail and base pressure drag that applies at all Mach numbers up to 1.3. The method requires that there are at least three diameters of cylindrical body upstream of the boattail and that there is no jet efflux or base bleed. The method for base pressure drag applies for boattail angles (the angle made with the base) up to 45 degrees but for boattail drag only for boattail angles up to 25 degrees for subsonic Mach numbers, 30 degrees for a Mach number of 1 and 35 degrees for supersonic Mach numbers. The method may also be used for afterbodies of parabolic profile. The total afterbody drag is the sum of the two components. The quality of fit with the experimental data is illustrated; total drag coefficient based on body maximum diameter is estimated to within 0.015. However, because of the limited sample of data, it is suggested that an accuracy of 0.03 should be allowed for. A worked example illustrates the use of the method.Indexed under:
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Data Item ESDU 96012  

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This Data Item contains 20 interactive graph(s) as listed below.
Graph  Title 

Figure 1a  Base drag coefficient for M =< 0.8 
Figure 1b  Base drag coefficient for M =< 0.8 
Figure 2a  Base drag coefficient for M = 0.9 
Figure 2b  Base drag coefficient for M = 0.9 
Figure 3a  Base drag coefficient for M = 1.0 
Figure 3b  Base drag coefficient for M = 1.0 
Figure 4a  Base drag coefficient for M = 1.1 
Figure 4b  Base drag coefficient for M = 1.1 
Figure 5a  Base drag coefficient for M = 1.2 
Figure 5b  Base drag coefficient for M = 1.2 
Figure 6a  Base drag coefficient for M = 1.3 
Figure 6b  Base drag coefficient for M = 1.3 
Figure 7  Base drag coefficient of cylindrical afterbody 
Figure 8  Boattail drag coefficient for M =< 0.6 
Figure 9  Boattail drag coefficient for M = 0.8 
Figure 10  Boattail drag coefficient for M = 0.9 
Figure 11  Boattail drag coefficient for M = 1.0 
Figure 12  Boattail drag coefficient for M = 1.1 
Figure 13  Boattail drag coefficient for M = 1.2 
Figure 14  Boattail drag coefficient for M = 1.3 