One Question? Have you bought everything separate, there are so many complete deals these day and they are good, Tower hobbies has two complete arf kits with radio, engine and plane, and so does Horizon Hobbies. These RTF kits are great, it takes about 30 minutes to an hour to complete your plane by turning a few wing nuts, installing an aluminum tube in the wing a strip of tape and connecting the control rods to the control horns and your done. Engines are installed pre-set and broken in, one tank of fuel to test run. Radios are standard four bangers from JR or Futaba. I have observed these planes fly, and operate very user friendly. Now for your question, every person has their prefered engine for trainer application. I have had some of the earlier TT engines as well as OS bushing engines, I prefer them over their ball bearing counter parts. They are easy to run in and they are ***** cats to start and run, almost maintaince free. If i were you, I would buy the gp42, fly the heck out of the trainer learn everything you want to know about trainer flight find a newby just getting into the hobby sell him your trainer set up for a couple of hundred dollars. Then buy some primo gear and go to town on your next plane, this time buy keeper stuff like Saito four strokes, a good budget priced computer radio and your plane of choice. Have fun!!!!
wra