Comment on "Efficiency: Perfect pitch UAVs and airboats lead to new propellers (at least some good from UAVs / Drones)"
I've read that the fewer blades the more efficient the prop, even that one blade would be the best if it didn't need such a heavy counter weight. When I think...Comment on "Papalotzin the movie- Following Monarch Butterflies on their thousand miles migration in a trike"
We got this movie several months ago, it was cool. Trike flying following th...billions to less than 33M due to loss of habitat and milkweed (associated with heavy use of herbicides). Spe...