mobile1
New Member
Joined: December 2016
Posts: 1 
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Post by mobile1 on Dec 30, 2016 17:52:53 GMT -5
How does a bypass increase thrust?
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Post by racket on Dec 30, 2016 20:18:13 GMT -5
By accelerating a larger mass flow at a lower velocity .
For example , a 100 lb thrust engine might accelerate 1.8 lbs/sec to a high velocity 1789 ft/sec ,( thrust = mass X velocity , 100 = 1.8 X 1789 divided by 32.2) but that 100 lbs of thrust if processed through an extra turbine wheel might produce 100 horsepower which might produce 300 lbs of thrust by accelerating 9 lbs/sec ( 5:1 bypass ratio) to a more modest 1073 ft/sec .
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rcman50166
Member
Building 400HP Turboshaft
Joined: November 2016
Posts: 34
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Post by rcman50166 on Jan 3, 2017 15:05:56 GMT -5
In a less a technical sense, an engine makes more power than it takes to operate. Like a gas power plant, the extra power can be used to turn a generator to make electricity or in the perspective of a high bypass turbofan, a very large, many bladed, cowled propeller. That's all the fan is.
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