I am using this tri-copter to test servo controllers. There were a few challenges to getting this off the ground and hopefully this helps others with a really cool project, enjoy!
This is a spin off of another one of my projects currently on Kickstarter, check it out also if you get a chance: http://kck.st/ZhKt0j or search for Blue-Rx.
Step 1: Parts List
Various pieces of wood
12 AWG Wire
Shrink Wrap Tubing
3 Props (GWS 10 x 4.7) $17.94
3 Motors (1300 kV) $21.98
3 Speed Controllers (18 Amp) $21.45
1 Battery (LiPo ~3000mAh) $13.73
1 Charger $27.29
1 Servo $4.37
1 Servo Extension Cable $2.16
1 4ch TX/RX $53.82
1 Mult-rotor Control Board $12.99
1 AVR programmer or Arduino ISP $14.99
Total: less than $200.00
Step 2: Create the Frame
It is best to get the angles accurate between the arms but believe it or not, its not really necessary. If they are close the computer control via the multi-rotor control board will compensate for any error!