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Does the F14 experience mach tuck?


WelshZeCorgi

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1 hour ago, DD_Fenrir said:

It’s cog, not Mach tuck. The wings are fully aft a good ways before you hit the number.

Glove vanes were there to bring a measure of instability to help maintain the aircrafts pitch rate at supersonic airspeeds. 

Mach Tuck occurs prior to the aircraft going supersonic and can occur well below Mach 1. Mach tuck happens when local airflow over the airfoil exceeds Mach 1, no matter how fast the aircraft may be going.

 

 

 

 

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Yeah it’s the shift of both the CoG and the CoP - even when you manually sweep the wings aft at lower air speeds it gets nose heavy as the wings go aft.


It depends on where the CoP is in relation to the CoG; CoG must move aft as the mass of the wings is transferring aft. CoP must also move aft but you get a nett reduction of the total lift generated by the wings (wings forward = more lift, wings aft = less lift).

If the CoG is forward of the CoP, wings lifting moment around the CoG must increase to justify the requirement to increase in downward force provided by the horizontal tail is to maintain nose attitude, meaning the centre of Pressure must be travelling a greater amount then the CoG.

If the CoG is aft of the CoP, wings lifting moment around the CoG must decrease, meaning the centre of Pressure must be travelling a greater amount then the CoG.

 


Edited by DD_Fenrir
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