I have finally, finally finished building my octo, and had two test flights. Or rather, hops.
I have 10x45props with Motor AC2836-358, 880Kv from 3DRobotics. At the time, they were specified to provide 433grams of lift at 50% and 1095grams at 100%.
My frame, with 5000mah, 30C battery weights in at 3000grams. At 50%, I should have 3464grams of lift, in an ideal world.
However, while I start hopping at 50% throttle, even at full throttle I barely lift a foot off the ground.
I'm using custom motor mixing, to match my frame, as follows:
add_motor_raw(AP_MOTORS_MOT_1, -0.859746, 0.333333, -1.000000, 2);
add_motor_raw(AP_MOTORS_MOT_2, -0.859746, 1.000000, 0.867150, 1);
add_motor_raw(AP_MOTORS_MOT_3, -0.664349, -1.000000, -0.984903, 4);
add_motor_raw(AP_MOTORS_MOT_4, -0.664349, -0.333333, 0.882246, 3);
add_motor_raw(AP_MOTORS_MOT_5, 0.859746, 1.000000, -0.867150, 5);
add_motor_raw(AP_MOTORS_MOT_6, 0.664349, -1.000000, 0.984903, 8);
add_motor_raw(AP_MOTORS_MOT_7, 0.664349, -0.333333, -0.882246, 7);
add_motor_raw(AP_MOTORS_MOT_8, 0.859746, 0.333333, 1.000000, 6);
I realized (longer after staring the build), that a V shape is not optimal, but surely I am not losing this much power? I have calibrated the transmitter, ESCs.
Any thoughts or oversights that explain why I don't get the lift I am looking for?