"The mounted brushless motors need power. For that, you could use a slip ring in your shaft, every other idea seems harder to implement. I'd assume they would still be pretty hard to put together for a prototype."
"Neat analysis. I like that someone went out of their way to document this stuff.
The last sentence, "This is primarily due to the exponential increase in the polar inertia of the rotor blade", leaves a bad taste. P^5 is not exponential, 5^P is. If…"
"Personally, I order from alibaba. The two problems are minimum order quantities (depends on seller) and shipping fees.
I found Dragon Plate to be more expensive, although I'm sure their quality is sky-high. Also, their metric selection was lacking…"
"A while back I bought a 12mm x 500mm carbon tube (circular, not square) from hobbyking to compare against the same size tubes from a carbon fiber supplier. HK's tube flexed way more (5x?), and weighed more, too."