Using coaxial motor setup on a multicopter is known to be less efficient regarding for example flight time. I have seen some use one inch bigger props on the lower motors. Same motors. What is the theories? Should I use bigger props on the lower motors on the octacopter?
Have no one used this different sized propeller-idea on coaxial?
I am building a X8 with lifted arms, the 15" lower props almost touches the frame, 2mm from it, when off. Thats not gonna work when revving up.
There’s mixed information, and it’s difficult to separate opinion from fact.
A slightly higher pitch on the lower motors makes some theoretical sense but in practice I think the consensus is that it doesn’t really matter.