I just built a tri-copter. Here's what I used: Frame: http://shop.flitetest.com/multirotors/bat-bone-tri-370-kit/ http://shop.flitetest.com/multirotors/bat-bon

I just built a tri-copter. Here's what I used: Frame: http://shop.flitetest.com/multirotors/bat-bone-tri-370-kit/ http://shop.flitetest.com/multirotors/bat-bone-tri-370-kit/ but you can easily build a frame yourself from either wood or aluminum towel holder bars from home depot. Flight controller: http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=24723&aff=247441 http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idp... I have this one, the 2.0, but there's a 2.1 out now too. Motors: http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=14398&aff=247441 http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idp... ESCs: http://www.hobbyking.com/hobbyking/store/__25363__Turnigy_Multistar_15_Amp_Multi_rotor_Brushless_ESC_2_3S.html http://www.hobbyking.com/hobbyking/store/__25363__Turnigy_Mu... Tail servo (don't needs this for a quad): http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=11626&aff=247441 http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idp... Batteries: http://www.hobbyking.com/hobbyking/store/__9394__Turnigy_2200mAh_3S_30C_Lipo_Pack.html http://www.hobbyking.com/hobbyking/store/__9394__Turnigy_220... Radio: http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=8992 http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idp... That's all the major parts. You'll need a few odds and ends like propellers, servo extensions, connectors for the battery and ESCs, etc. Hobbyking sells a power distribution board you can use if you don't want to make your own wiring harness.