Hey, I am having an issue going from APC MR props to Graupners. I have a 10lb Y6 hex, with 10'' APCs on top and 12'' APCs on the bottom. It flies great this way, with the average motor output around 60% at hover. I then decided I wanted to switch to Graupners for the rigidity, so I ordered some 10'' for the top and 12'' for the bottom. It barely flies now. The motor outputs are around 80% at hover now and it can barely yaw. Oh I am running Avroto 2814 motors by the way. Should I just get 2 inch longer Graupners for the top and bottom, or do I need to step up from 4s to 6s? Appreciate the help
Going from APC MR To Graupner
- Thread starter nels2825
- Start date
Bartman
Welcome to MultiRotorForums.com!!
those Graupner props will make less lift, the blades are very thin with little to no airfoil shape, they're really just displacing air more than making real lift.
mismatched diameters looks good on paper but the different weights of the two sizes of props can cause headaches for the flight control which uses the reactive force of from the props' torque to balance yaw. with four props of one size/weight spinning in one direction and four props of another size/weight spinning in another direction the flight controller has to constantly try to balance yaw along with lift and other control forces but without the benefit of yaw being almost balanced when 1/2 the motors are turning one direction and the other half are turning the other direction
just my two cents. try all 12" if you really want to continue with the Graupners. Higher pitch on the bottom works well for coaxials, I've tried a lot of different schemes for coaxials, hhigher pitch on bottom seems to give good results without causing other problems.
mismatched diameters looks good on paper but the different weights of the two sizes of props can cause headaches for the flight control which uses the reactive force of from the props' torque to balance yaw. with four props of one size/weight spinning in one direction and four props of another size/weight spinning in another direction the flight controller has to constantly try to balance yaw along with lift and other control forces but without the benefit of yaw being almost balanced when 1/2 the motors are turning one direction and the other half are turning the other direction
just my two cents. try all 12" if you really want to continue with the Graupners. Higher pitch on the bottom works well for coaxials, I've tried a lot of different schemes for coaxials, hhigher pitch on bottom seems to give good results without causing other problems.
That's good info, thanks. Do you know where I can buy Graupners in multiple pitches? All I see is 6 in 12''. Actually I am having a hard time finding any prop in multiple pitches. If I can't do that maybe I will run 14'' or larger Graupners on the bottom, I have more than enough roomn