777
TT refers to Thunder Tiger engines. They are distrubuted by Ace.
Decent engines designed by a former engineer from OS.

Try this link:
http://www.acehobby.com/acehobby/index.html

As the thread goes the recommendation is for a different trainer. Don't be concerned about asking questions. All of us asked a few to learn what we know. This is in the correct forum for same.

Bill