"Motor-ESC-Prop combo determines whether you can use 3S, 4S or even higher. RTF weight of the kopter and whether the motor is at or just past its optimum at full throttle on 3S determines whether the better choice is a higher mAh 3S battery or a…"
"Of course first of all, make sure your props are very well balanced. Also occasionally check the props for small nicks due to e.g. hitting grass or twigs, and rebalance if there are clear nicks.
"If the arms are (accidentally) bent, then the may also be twisted which means your motor thrust will not be pointing straight down. In addition they may be bent not only in the horizontal but also in the vertical plain. The latter wil again result…"
"Just another thought: This blog format isn't too convenient to group information in. As ArduCopter and AeroQuad are closely linked, would it not make sense to set up one or two separate areas with the AaroQuad forum where threads specific for the…"
"Not sure why we call it "calibrating the ESCs". What we are actually doing is configuring or setting them up properly for use with the multikopter and that includes defining minimum and maximum throttle value, but can also include such things as…"
"Re calibrating the ACC, I-ve dumped the bubble level a while ago. Instead I have a harness made of four (or more if more than 4 arms) loops of equal length thin rope, noted together in the center. If you hook the loops behind the props, the arms are…"
"Just came accross another project which is using the name ArduCopter: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1194413232 . Maybe rename the multikopter ArduCopter to ArduKopter (the 'K' with it's four arm ends symbolizing the most common…"