Quadcopter Updates (2/6/14): Multiwii + Future Plans

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I did a major rebuild of this quadcopter. Video here:
Check out the channel "dronecmdr" for more RC related videos.
After a long period of YouTube inactivity and lack of progress regarding my quadcopter, I have decided to get back into the scene. I'm still using the same quadcopter frame that I built, but I plan to make upgrades to it soon. I recently bought the Multiwii 328P Flight Controller Board from Hobbyking. The cost of 9 DOF (Degrees-Of-Freedom) flight controller boards with barometric capability has decreased significantly, making it an easy decision to purchase one. So far, the performance of the Multiwii board has been a definite upgrade from my previous board, the Hobbyking Multi-Rotor Control Board, which isn't a surprise given that it only used gyros. However, the Multiwii's performance could be improved with further tuning. I also purchased an I2C-GPS board so that I could connect my homemade GPS to the Multiwii board.
I replaced the battery as the old one was reaching its end-of-life and was puffing up. I also replaced the propellers with 9x4.7 props (which I forgot to mention in the video).
I have plans to build a new quadcopter which will be a "Tactical" style quadcopter. It will be in a "H" configuration, instead of the typical "+" or "X". It will be painted all black to match the "tactical" theme. The arms will be removable so it can be carried in a backpack, which will be accomplished by using picatinny rails and quick disconnect scope rings. The 1/2" arms will fit in the scope rings using 1" sorbothane vibration isolation washers. I'm not sure when it will be completed since it will be a $100 project at least and I think getting a camera on my current quadcopter is more of a priority.
I also demonstrate how the telemetry data is getting back to my laptop, which, by the way, is a Panasonic Toughbook CF-29 that was given to me. I'm using the Raspberry Pi to relay the UART data to (and from) my laptop using an ad-hoc wireless connection. But, I'm having issues with the link quality which I suspect is a problem with the Raspberry Pi as I have heard that it has some USB issues. The Multiwii board supports using a bluetooth UART adapter which I might have to try.
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