performance

I have a naze 32 on a 250 race style quad. Basically I want to get the most out of my PID tuning. I fully understand the P-I-D coefficients and what they do, I'm a mechanical engineer by training, but that doesn't give me the hands on to PID tuning procedure. So how do I start? zero...

My question is fairly simple: how does one decide on the ideal dimensions and ratios for a flying wing given the target cruising speed and payload or other relevant flight characteristics. For a more conventional aircraft, I feel like I have a fairly good intuition as far as changing the wing...

I have a motor that takes a 2S and 3S batteries. Will the motor react any differently to a 3S than it does a 2S? Is there a difference in flight time? I realize the 3S has higher voltage but how does that play into the performance of the motor? Thank you