The numbers on the prop are the diameter (first) and the pitch (second). Pitch is the distance, in inches, the prop will travel through a solid material in one revolution, this is theoretical as there is a lot of slippage in the air. GIVEN THE SAME RPM: more pitch/less diameter = more speed, more diameter/less pitch = pull.

I'd use an 11-5 for your trainer. I would suggest Master Airscrew for your trainer.

IMO, there's not a better all around plug than the McCoy 9 or 59.

When you order your radio, you can specify which channel you want. Go to your field and see which frequency seems to be the least used. Some clubs keep lists of frequencies currently in use. If you are close to a channel 4 TV station, do NOT order channel 20. Some more expensive radios have synthesized frequencies, and can be tuned just like a TV. As a beginner, you do not need this unless your club is VERY active.

Dr.1