RE: Electric Power Suggestions For Midwest Tri-Squire?
[link=http://flbeagle.rchomepage.com/software/webocalc_1.05/html/webocalc_imperial.html]WeboCalc[/link] can help you configure your power system. Just plug in the vital statistics for your plane, and the program will help you select the power system you need. Read the excellent "Help" section for a tutorial. There are many, many motors, ESCs, and batteries that will do an excellent job for you. This program will let you select the right values for the ones you may choose. You are shooting for a system that delivers excellent power (approaching 1:1 or better) while staying just warm. A wattmeter should be used to verify that you are not overloading any of the power system components (battery, motor, or ESC).
Just guessing, you are probably looking for a 2-3 oz. outrunner rated at about 800 - 1000 rpm/volt (Kv) swinging a 9x5 to 11x5 prop. You will probably need about 20 - 30 amps depending on the voltage you choose, 3S or 4S (about 10.8 - 14.5 volts). A 2200 mAh 4S (4-cell lipo) might be a good battery selection. It could comfortably provide a 10C draw (22 amps) for around 300 watts without adding too much weight. Good luck with your configuration!