Author: Robert J. TapscottPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Charts for Estimating Performance of High-performance Helicopters
Author: Robert J. TapscottCharts for Estimating Performance of High-performance Helicopters
Author: Alfred GessowPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 33
Book Description
The charts may be used to study the effects of design changes on rotor performance and to indicate optimum performance conditions, as well as to estimate quickly rotor performance in forward flight. They are also useful in obtaining inflow-ratio and pitch-angle values for use in calculating flapping coefficients and spanwise loadings. The method of applying the charts t o performance estimation is illustrated through sample calculation of a typical rotor-performance problem.
Supplementary Charts for Estimating Performance of High-performance Helicopters
Author: Robert J. TapscottPublisher:
ISBN:
Category : Charts, diagrams, etc
Languages : en
Pages : 31
Book Description
Charts published in NACA TN 3323 for estimating the performance of high-performance helicopters were applicable to rotors having hinged rectangular blades with a linear twist of -8 degrees. Supplementary charts are presented herein covering twists of 0 degrees and -16 degrees.
Charts for Estimating Rotor-blade Flapping Motion of High-performance Helicopters
Author: Robert J. TapscottPublisher:
ISBN:
Category : Charts, diagrams, etc
Languages : en
Pages : 692
Book Description
Theoretically derived charts showing steady-state and first- and second-harmonic flapping coefficients are presented for helicopter rotors having hinged rectangular blades with a linear twist of 0, -8, and -16 degrees. The charts, showing the rotor flapping coefficients for combinations of inflow ratio and blade pitch angle, are presented for tip-speed ratios ranging from 0.05 to 0.50.
A Note on the Calculation of Helicopter Performance at High Tip-speed Ratios
Author: Alfred GessowPublisher:
ISBN:
Category : Mathematical models
Languages : en
Pages : 18
Book Description
NACA Wartime Reports. Series L.
Author: Herbert W. TalkinPublisher:
ISBN:
Category : Charts, diagrams, etc
Languages : en
Pages : 50
Book Description
Charts are presented relating helicopter aerodynamic design variables to performance in steady powered flight. The flight conditions covered are hovering, climb, and horizontal flight. Helicopter speed and lifting rotor power can be found from the charts for known values of fuselage drag coefficient and an average effective blade-element drag coefficient. An abbreviated method for estimating the drag coefficient from the airfoil polar is explained. Although the main emphasis of the report is on relating the design variables to performance, brief consideration is given to the effects of a number of secondary variables, among which are the number of blades, the rotational-energy loss, and the blade shape. An approximate method for estimating the conditions for blade stall is also explained.
Charts for Estimating Rotary Wing Performance in Hover and at High Forward Speeds
Author: Watson H. TannerPublisher:
ISBN:
Category : Helicopters
Languages : en
Pages : 0
Book Description
Charts for Estimating Rotary Wing Performance in Hover and at High Forward Speeds
Author: Watson H. TannerPublisher:
ISBN:
Category : Helicopters
Languages : en
Pages : 162
Book Description
Report
Author: United States. National Advisory Committee for AeronauticsPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 42
Book Description
Technical Note - National Advisory Committee for Aeronautics
Author: United States. National Advisory Committee for AeronauticsPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 386
Book Description