I am guessing here about the plane. I am figuring it is about the size of an Electric Cub. I had a Cub and started with a brushed 540 and 8 nicds. I am going to put this power setup in my Cub. It should be close to what you need. so a 40 inch span balsa trainer type plane, guessing it will weigh in at about 2 to 3 pounds ready to fly.
Here is the 10 sized [link=http://www.hobbypartz.com/monsterpower-101100kvbrushless-motor.html]motor[/link] or a little bigger [link=http://www.hobbypartz.com/monsterpower-15950kvbrushless-motor.html]motor 2[/link] Here is the [link=http://www.hobbypartz.com/volcano-40a-brushless-electric-motor-speed-controller-esc.html]ESC[/link]
Online calc program
http://www.s4a.ch/eflight/motorcalc_e.htm
I ran the Monster power 10 with a 2100mah 3s lipo, APC 11X6 prop through this calc program and it lists 62 ounces of thrust. So that gives you just over 3 1/2 pounds of thrust.
Running the Monster power 15 gives only 3 ounces more thrust.
Buzz.