Inefficiency from redirected thrust?

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Redirecting thrust in aircraft like Harrier jets results in efficiency losses due to turbulence and friction within the redirection ducts. The extent of thrust loss depends on factors such as duct design, airflow dynamics, and the angle of redirection. Comparing older designs like the Harrier with newer models such as the F-35 may reveal advancements in ducting mechanisms that improve efficiency. Engineering improvements can potentially minimize thrust loss by optimizing duct shapes and reducing turbulence. Understanding these dynamics is crucial for enhancing vertical takeoff and landing aircraft performance.
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I am trying to figure out how much thrust would be lost in redirecting it.
I understand that that harrier jets redirect their thrust downwards to generate upward thrust but surely they lose some efficiency due to turbulence and friction inside the redirection duct.
My question is how much is lost? also, what is that loss dependent on? and finally are there any ways to engineer the redirection better so that less thrust is lost.
Thanks in advance for any help in this.
 
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greg said:
I am trying to figure out how much thrust would be lost in redirecting it.
I understand that that harrier jets redirect their thrust downwards to generate upward thrust but surely they lose some efficiency due to turbulence and friction inside the redirection duct.
My question is how much is lost? also, what is that loss dependent on? and finally are there any ways to engineer the redirection better so that less thrust is lost.
Thanks in advance for any help in this.

I would think you could learn a lot by contrasting the older Harrier jet design with the newer F-35 STO/VOL design. Did they change the ducting mechanism for the newer F-35?
 

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