ESDU 87033
Normal force and pitching moment of conical boat-tails.
Abstract:
ESDU 87033 provides an empirical method for predicting the change in normal force and pitching moment due to applying moderate boat-tailing to an axisymmetric forebody-cylinder combination.
The method applies for Mach numbers from 0.2 to 5 and angles of attack up to 90 degrees and is derived from a correlation of wind-tunnel results drawn from the literature for bodies of fineness ratio from 3 to 13 with boat-tail angles between 2.5 and 10 degrees. The method predicts the change in normal-force coefficient (based on maximum cross-sectional area) to within 0.05 for values above -0.5 and within 10 per cent for lesser values, and predicts the change in pitching-moment coefficient (based on maximum cross-sectional area and body overall length) to within 0.02. The use of the method is illustrated by a worked example. The calculation procedure is programmed in ESDUpac A9034, see ESDU 90034.
Indexed under:
- Boat-Tailing
- Centre of Pressure
- Derivatives
- Normal Force
- Normal-Force-Curve Slope
- Pitching Moment
- Pitching-Moment-Curve Slope (MW or Cmα)
Details:
Data Item ESDU 87033 | |
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This Data Item is complemented by the following software:
Name | Details | ||||
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ESDUpac A9034 |
This program is only available to subscribers. |