I would like to introduce the DIYD community to my project, the T1000.  This is a tandem rotor helicopter based on T-Rex 450 parts, with custom 425mm asymmetrical blades.  The initial goal for the project (in 2011) was to have a fpv platform that could fly for over 1/2 hour.  I now think we can now achieve a 1+hr flight time with a 1kg payload.  This is similar to the twin-rex, and indeed utilizes their TH2 for the moment for servo mixing.  Our project differs in many ways from the twin-rex though.  First of all, we are using a large diameter thin walled carbon timing shaft through a square carbon torque tube.  We also use custom designed 2mm carbon nacell plates, along with our in-house manufactured asymmetrical 425mm blades.  The third requirement for us getting 1+hr flight times with this platform is the 18650b battery.  Though this drawing only indicates a 45 cell pack, I plan on using a 69 cell, or 3s23p custom Li pack.  The orientation of the battery pack, and the landing gear have yet to be determined.  

Please post any questions or comments (I will not be offended by negative comments, please be honest)