This is a fixed version of snjos firespitter dll by RadarManFromTheMoon. Only thing changed is the tail rotor producing thrust only into one direction regardless of user input.

See http://forum.kerbalspaceprogram.com/threads/76668-0-90-Kerbal-Aircraft-Expansion-%28KAX%29-v2-3-3?p=1649238&viewfull=1#post1649238 for further information