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I just built a tri-copter. Here's what I used:

Frame: 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?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?idp...

ESCs: 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?idp...

Batteries: http://www.hobbyking.com/hobbyking/store/__9394__Turnigy_220...

Radio: 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.



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