Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Question
Calculate the Gear Ratio.
Transcribed Image Text:The helicopter's engine's
output shaft rotates at
2400rpm and is connected to
reduction gearbox.
The gearbox's input simple gear
have 20 tooth and the output
simple gear have 100 tooth.
The gearbox's output rotation
velocity is the same as the two
helicopter rotor blades.
The average radius of the rotor
blade is 2.5m and the lift of
one rotor blade is (0.413) v².
2
helicopter
rotor blade
helicopter
rotor head
gearbox
Average radius of rotor blade = 2.5m
© 2012 Encyclopædia Britannica, Inc.
Helicopter Rotor Blade
compressor combustion core
chamber turbine
output
shaft
2400rpm
power
turbine
Transcribed Image Text:The 400kg helicopter yaws at level (same
altitude) and makes a circular motion (top
view), with a radius of 20m.
The resonant frequency of the rotor blade
at 6.7Hz and the flutter speed is 28m/s.
Centre of
circular
motion
60°
20m
Front View
20m
Top View
Lift
Helicopter
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Follow-up Question
The 400kg helicopter yaws at level (same altitude) and makes a circular motion (top view), with a radius of 20m.
The resonant frequency of the rotor blade at 6.7Hz and the flutter speed is 28m/s.
Calculate the time to complete one circular motion.
Solution
by Bartleby Expert
Follow-up Question
Calculate the time to complete one circular motion.
How to double the time?
Solution
by Bartleby Expert
Follow-up Question
Is there vibration experienced by the helicopter?
i. If yes, what caused it and how to reduce this vibration?
Solution
by Bartleby Expert
Follow-up Question
Calculate the time to complete one circular motion.
Solution
by Bartleby Expert
Follow-up Question
Calculate the forward velocity of the helicopter.
Solution
by Bartleby Expert
Follow-up Question
Calculate the force required for circular motion.
Solution
by Bartleby Expert
Follow-up Question
Calculate the lift generated by the helicopter rotor blade.
Solution
by Bartleby Expert
Follow-up Question
Calculate the helicopter rotor blade’s rotational speed.
Solution
by Bartleby Expert
Follow-up Questions
Read through expert solutions to related follow-up questions below.
Follow-up Question
The 400kg helicopter yaws at level (same altitude) and makes a circular motion (top view), with a radius of 20m.
The resonant frequency of the rotor blade at 6.7Hz and the flutter speed is 28m/s.
Calculate the time to complete one circular motion.
Solution
by Bartleby Expert
Follow-up Question
Calculate the time to complete one circular motion.
How to double the time?
Solution
by Bartleby Expert
Follow-up Question
Is there vibration experienced by the helicopter?
i. If yes, what caused it and how to reduce this vibration?
Solution
by Bartleby Expert
Follow-up Question
Calculate the time to complete one circular motion.
Solution
by Bartleby Expert
Follow-up Question
Calculate the forward velocity of the helicopter.
Solution
by Bartleby Expert
Follow-up Question
Calculate the force required for circular motion.
Solution
by Bartleby Expert
Follow-up Question
Calculate the lift generated by the helicopter rotor blade.
Solution
by Bartleby Expert
Follow-up Question
Calculate the helicopter rotor blade’s rotational speed.
Solution
by Bartleby Expert
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