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Oh the subject of the difficulties that GD had with twin vertical stabilizers in their ATF proposal, the F-22 would also end up encountering problems with vibrations and buffeting in the vertical tails at certain Mach numbers and g conditions, due to the vortex impingement at those specific conditions. This was reported back in 2000.[URL unfurl="true"]https://www.flightglobal.com/buffeting-problem-may-mean-airframe-changes-for-f-22-/34405.article[/URL]According to Jay Miller’s book on the F-22, this issue was eventually resolved with some strengthening of the vertical tails and flight control software changes.Still, this makes me a bit curious on why GD abandoned twin canted vertical stabilizers. Perhaps there wasn’t enough time for them to fine-tune a satisfactory configuration before the RFP submission? Along with the inlet, vertical tails took among the longest time in wind tunnel testing for the Lockheed/Boeing/General Dynamics team, and even then, there ended up being buffeting from flow impingement that modeling had failed to predict.
Oh the subject of the difficulties that GD had with twin vertical stabilizers in their ATF proposal, the F-22 would also end up encountering problems with vibrations and buffeting in the vertical tails at certain Mach numbers and g conditions, due to the vortex impingement at those specific conditions. This was reported back in 2000.
[URL unfurl="true"]https://www.flightglobal.com/buffeting-problem-may-mean-airframe-changes-for-f-22-/34405.article[/URL]
According to Jay Miller’s book on the F-22, this issue was eventually resolved with some strengthening of the vertical tails and flight control software changes.
Still, this makes me a bit curious on why GD abandoned twin canted vertical stabilizers. Perhaps there wasn’t enough time for them to fine-tune a satisfactory configuration before the RFP submission? Along with the inlet, vertical tails took among the longest time in wind tunnel testing for the Lockheed/Boeing/General Dynamics team, and even then, there ended up being buffeting from flow impingement that modeling had failed to predict.
