2. The H145 helicopter is the modern derivative of the BK-117. This helicopter has a hingeless...
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2. The H145 helicopter is the modern derivative of the BK-117. This helicopter has a hingeless rotor, but we can define an effective hinge offset based on the properties of the flexelement" connecting the rotor blade to the hub. The H145 has a maximum takeoff mass of 3800 kg and an estimated equivalent flat-plate drag area (f) of approximately 1.55 m. The maximum continuous power at sea level is 617 kW per engine (2 engines). The following data pertain to the rotors: rotor diameter number of blades, B blade chord, c rotor tip speed, R profile drag coefficient, c airfoil lift-curve slope, a twist (degrees), 01 effective hinge offset, e collective range (degrees), 0 longitudinal cyclic range (degrees), B1 blade moment of inertia, I PEBX Main Rotor Tail Fan 11 m 1.15 m 4 10 0.32 m 0.088 m 221 m/s 194 m/s 0.0069 0.009 5.79 5.73 -8 0 0.12 0 -0.2 to +14.0 -8 to +20 -5 to +18 314 kg-m - Airbus H145 helicopter. (a) For the H145 in hover at sea level and at its maximum weight, estimate the rotor coning angle. If a rotor blade is disturbed from its equilibrium position, estimate the blade flapping frequency. In order to do this, you will need to find the aerodynamic moment in hover including the effects of hinge offset. Hint: show that the homogeneous equation for the flapping angle is 1 3 + ] 2(1 - e)(1 + Je)3 - +/12(1-e)(1. 2+e 2(1-e) 3=0 (b) Airbus claims that the H145 maximum cruising speed is 133 kts at sea level at its maximum takeoff mass of 3800 kg. Find the collective angle that would be required for the EC135 to fly under these conditions. Find the longitudinal cyclic angle (B1) that would be required for these flight conditions if as = -5. (You do not need to include effects of hinge offset for part (b).) (c) Estimate the power required for the H145 to fly at this weight at this operational condition. (d) Based on your solutions to parts b and c, do you think the H145 can fly at this speed at this weight at sea level? 2. The H145 helicopter is the modern derivative of the BK-117. This helicopter has a hingeless rotor, but we can define an effective hinge offset based on the properties of the flexelement" connecting the rotor blade to the hub. The H145 has a maximum takeoff mass of 3800 kg and an estimated equivalent flat-plate drag area (f) of approximately 1.55 m. The maximum continuous power at sea level is 617 kW per engine (2 engines). The following data pertain to the rotors: rotor diameter number of blades, B blade chord, c rotor tip speed, R profile drag coefficient, c airfoil lift-curve slope, a twist (degrees), 01 effective hinge offset, e collective range (degrees), 0 longitudinal cyclic range (degrees), B1 blade moment of inertia, I PEBX Main Rotor Tail Fan 11 m 1.15 m 4 10 0.32 m 0.088 m 221 m/s 194 m/s 0.0069 0.009 5.79 5.73 -8 0 0.12 0 -0.2 to +14.0 -8 to +20 -5 to +18 314 kg-m - Airbus H145 helicopter. (a) For the H145 in hover at sea level and at its maximum weight, estimate the rotor coning angle. If a rotor blade is disturbed from its equilibrium position, estimate the blade flapping frequency. In order to do this, you will need to find the aerodynamic moment in hover including the effects of hinge offset. Hint: show that the homogeneous equation for the flapping angle is 1 3 + ] 2(1 - e)(1 + Je)3 - +/12(1-e)(1. 2+e 2(1-e) 3=0 (b) Airbus claims that the H145 maximum cruising speed is 133 kts at sea level at its maximum takeoff mass of 3800 kg. Find the collective angle that would be required for the EC135 to fly under these conditions. Find the longitudinal cyclic angle (B1) that would be required for these flight conditions if as = -5. (You do not need to include effects of hinge offset for part (b).) (c) Estimate the power required for the H145 to fly at this weight at this operational condition. (d) Based on your solutions to parts b and c, do you think the H145 can fly at this speed at this weight at sea level?
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Foundations of Financial Management
ISBN: 978-1259024979
10th Canadian edition
Authors: Stanley Block, Geoffrey Hirt, Bartley Danielsen, Doug Short, Michael Perretta
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