1) Aircraft tail configuration
Found on
https://www.crosswordclues.com/clue/twin-tail
A twin tail is a specific type of vertical stabilizer arrangement found on the empennage of some aircraft. Two vertical stabilizers—often smaller on their own than a single conventional tail would be—are mounted at the outside of the aircraft`s horizontal stabilizer. This arrangement is also known as an H-tail, as it resembles a capital `H`......
Found on
http://en.wikipedia.org/wiki/Twin_tail
No exact match found.
