"@naish88  Then according to your math, this thing should fly for like 62.5 hours then..."

"You could make a nice micro CNC router with those lol."

"I'd always wondered if something like this was possible.  Though I never though of doing it with a fixed pitch rotor (just wouldn't have guessed it possible).  One downside I'd imagine is fact you can only mount payloads directly centered on the x…"

"There are a few other advantages to the tandem rotor system vs a single rotor.  First is there is a lot of area for mounting payloads.  Another benefit is with a center mounted payload, the motors and gears are located over 1 foot away from the…"

"@Hugues: The two rotor will cost about half as much as a 4 rotor version as far as prototyping, while still serving as a proof of concept.  We do have a 4 rotor version of this on the drawing board as well.  Aerodynamically the two rotor should be a…"

"Our secondary goal was redundancy.  When the payload is often worth more than the craft these things seem prudent."

"@Gary
It is my understanding that the Chinook is designed that way to facilitate forward travel.  Our main goal was super efficient hover."

"@Ed
Multiple motors on one drive-train will add redundancy like you said, but will increase losses by a bit on a few fronts.  The first electronic losses due to KV differential between motors.  Even though 4 motors may have the same rated KV, they…"

"At the risk of being labeled a "hater", I feel I should elaborate on my previous post.  I believe that a craft of that size with fixed rotors will be difficult to control.  Making the props as light as possible will help mitigate the inertial delays…"

"@Jesse
I try to be supportive too.  Lord knows I've had enough ideas "shot down" by people close to me whom, IMO just really didn't understand what I was saying. My support for peoples ideas diminishes when I see something that I feel has the real…"

"Without variable pitch blades (among other things) I don't see how you could possibly control this.  I saw a video of a Chinese fella with a octo I believe that was powered by lawnmower engines.  The results were not promising, though it did make…"

"My .02
I don't think it would be totally unreasonable to use a system similar to the way guns or cars are registered.  Using multiple serial numbers on the drone parts, particularly the APM, could add a little accountability.  If a drone causes some…"

"Kevlar is a good option too : )  I would experiment with different hybrids, like you said, with Kevlar or S-glass as the base and just use the carbon achieve the desired stiffness/look.  Either way, cool project."