I have a 450 frame , 2213 920kV motor , 9450 carbonfiber props 4S battery. And I have
loaded some more weight to take it to 1500g take-off-weight.
Here are some values from the logs:
(doing a hover) in stabalise mode
CTUN TH0 0.35 ( docs refer to 30% as the limit )
RCIN ( C3 ) mean 1479
RCOUT (mean)
C1 1654
C2 1653
C3 1550
C4 1549
( I see the CW values differ from the CCW values ?? mmmmm … I shall worry about
that later…)
I do not have formal specs of the thrust of the motor/prop combination but if I work with
a value of in the region of 800-950 g/motor ( I am guessing this based on the tables
for the motor with other props ) … then it means I am somewhere between
2 and 3 : 1 power to mass ratio.
Would I be wrong in feeling comfortable with these figures ?
Yes, these numbers are right. If you feel that your quad is a little bit overpowered, you can always try to install a bigger battery. I make predesign numbers with 2.5. Then, as I like to add many sensors to my copters, they get some heavier and I fly around 2.3.
If your CCW motors work harder, maybe you have a small motor/propeller tilt or misalignment. If you can fix it, your motors will have more margin for maneuvering.
Always good to hear which numbers other people are using : in your case 2.5.
Some docs that I have read , suggests 2 but it always felt that something closer to 3 would
be safer.
I shall consider your comment about the CCW motors working harder. The motors are
hard-mounted so there shouldn’t be any tilt because of any mountings. But I can check if the
frame itself is 100% level. The frame itself is fairly rigid.