Non-dimensional methods for the measurement of hover performance of turbine-engined helicopters.
Abstract:ESDU 73027 shows how the method of ESDU 73026 is applied to analyse flight test measured data on hover. Three possible techniques are available. If rotor speed cannot be varied, Mach number effects are ignored and only density is required to characterise the atmosphere; otherwise temperature and either pressure or density must be measured. Collective pitch can be measured instead of using the torquemeter to measure power. A complete worked example based on practical test data illustrates the method. ESDU 74042 shows the method of ESDU 73026 applied to analyse level flight measured performance.
|Data Item ESDU 73027|