T-Tail vs. Conventional Tails
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T-Tail vs. Conventional Tails
Does anyone know the why some manufacturers choose T-Tails over conventional tails? What are the advantages and disadvantages of each? Thanks.
You tend to see T-tails on aircraft with aft mounted engines - it simply makes it simpler to place the engines if you put the horizontal tail on-top. However T-tails are far more susceptible to the uncoverable 'deep stall' phenomena. That's were the separated flow from a stalled wing effectively blanks out the tail so you can't push the nose back down to recover from the stall. Low tails are not normally susceptible to that 'deep stall' since at high angles of attack the horizontal tail is below the separated flow from the wing.
When I asked my gliding instructor, I was told that a T-tail required extra strength in the fin, and therefore extra weight, and that was a bad thing.
It also occurs to me that if the fin falls off, it is better for it not to take the horizontal stabiliser with it.
It also occurs to me that if the fin falls off, it is better for it not to take the horizontal stabiliser with it.
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You tend to see T-tails on aircraft with aft mounted engines - it simply makes it simpler to place the engines if you put the horizontal tail on-top. However T-tails are far more susceptible to the uncoverable 'deep stall' phenomena. That's were the separated flow from a stalled wing effectively blanks out the tail so you can't push the nose back down to recover from the stall. Low tails are not normally susceptible to that 'deep stall' since at high angles of attack the horizontal tail is below the separated flow from the wing.
A T-tail as said is mounted high and can get into a deep stall, these aircraft tend to have a stick shaker that warns of an approaching stall and if the pilot does not respond to it and lower the nose, the aircraft systems force the stick forward preventing the aircraft from entering the deep stall.
This will explain it
https://learjet35instruments.wixsite...instrument/aoa
other clever ways around the stall problems
https://www.v2aviation.org/post/30-september-1990