I did some testing on this a couple years ago by finding the center point on the body of the 4 motors. I used a helmet bracket for a gopro camera and used a strong enough string to support the weight. I hung the string from a hanging light in the dining room so I would have to secure anything in the ceiling. I found that aircraft favored one motor more then the other 3, and of coarse having more rear sag due to the battery weight. I then removed the soft cushion feet from the bottom of the landing gear and measured the distance from the table surface to the top of each motor. I found the same motor mentioned above distance was different from the other 3. At that time I came to the conclusion that measurements were different to offset to compensate for the sag.
After doing this test I tried finding someone that could maybe get into the firmware and adjust the Pitch settings while in full throttle. And I had no luck at finding such person.
From this point I began focusing on the characteristics of the pitch on the aircraft while in flight by reading the data from the flight logs. Here I found that the pitch is pretty much dictated based on temp. So the only time the aircraft is given max performance benefit is prior to reaching the temp window. At flight the average max pitch angle is -35.
So now the way the P3 is programmed, you wont be able to add weight or install some kind of wind deflectors that will force flight pitch. The reason is, the P3 reads each of the flight angles and adjust them while in flight to maintain altitude.
You want to go faster or make the aircraft more efficient, you will need to do it by firmware settings. And since you own the aircraft, it sure seems like you should be allowed to that, huh?
Btw, my hobby is Top Speed flights with the P3 which is the reason I look for ways to make it fly faster.
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