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I started one. https://docs.google.com/spreadsheets/d/1w9q_FbrBPAP8LMWmLNRe3lyF9J1yJXdhu3pNmemVJtg I was thinking about opening it up to anybody to change it, but I'm not sure if somebody would vandalize it. This would be nice info to have though.

Yes, definitely vibration can screw up an IMU, and cause a loss of control. That was a common problem with APM because there is no vibration damping on-board. But, IIRC DJI logs the IMU data and I looked at it and didn't see anything that would indicate that. But I'm no expert on DJI logs of...

Where do you find a 99.99+% reliable controller, at any price?

1. In the case of flying machines, it's the total area of the disks, when viewed from the top. And X8 only has 4 disks unfortunately. 2. 0.129717 * 4 = 0.519. 0.129717 * 8 = 1.037736 3. I don't use 4.2V/cell. I use a nominal voltage of 3.8V/cell, as this is typically the average cell...

The 80% rule is based on mAH used, not voltage. But there's also a pretty hard limit at 3.0V per cell. If you really load a battery, you could see the voltage sag to lower than 3.0V/cell, while it still has half it's capacity left. I believe this is bad for the battery too. What kind of amp...

IMO, I wouldn't fly any serious machine on a single battery. This gives you some redundancy against your one and only battery failing open circuit, which is the most common failure (they almost never short out in flight, which would take down even a dual battery setup, in flames).

IMO, landing at 3.7V is too soon. I land at 3.5V, and that seems to be the comfortable 80% capacity range. The heat of the batteries doesn't have a lot to do with how far you drain them. It's more determined by the internal resistance and the amperage load.

Me? I'd use a helicopter. ;) So for example, to achieve the 4.6 kg/m^2 disk loading my quad has, with with a 10kg AUW, you'd need 2.17m^2 of disk area. On a quad or X8, that would require 33" props. On an octo, 23" props. I don't have to tell you how big of a machine that would be. But...

That's sort of my point. The only thing you can do to reach my numbers, would be to use much bigger props, which would require a much bigger frame. It's a natural law, that the biggest determinant of efficiency is the disk loading, weight/area. You won't get meaningful increased in efficiency...

What voltage are you using? 4S or 6S? I'm assuming 6S, in which case, you're using 132 Watts/kg to hover. You're not efficient unless you're under 100. My quad does 90 W/kg. The issue is you're lifting 10kg on about 0.51 m^2 of disk area. Or 19.6 kg/m^2 Compare that to my quad, which is...

Wow, some nice tech there Old Man, good stuff. I did an internship in naval engineering, specializing in bolted joints. And then did some at Ford as well. You're right on. Exactly which product number are you referring to with the green Loctite? I've never heard of that one. I do have green...

I got to see an Aeryon Skyranger last week, another $100,000 system. It was fairly unremarkable. The flight time was good at 45 minutes. And the GUI was pretty nice. But otherwise not that special.

Well, 1km is about as far as you'll typically get with typical power and rubber duck antennas anyway. Actually, I normally only get about 500m. Adding an extra receiver will not change that. What you need is a better antenna, more power, or both.

How does having 14 channels increase range?

We really need to look at specific numbers here, because this is getting confusing. Too much hand-waving. From what I have seen, people in the pro film industry are pushing the limits, and not designing reliable power systems. The whole aircraft design is not robust because it's too close to...

At 100% throttle, they will not draw more than whatever it is they draw at full throttle with that prop. It's the prop in combination with the motor that determines maximum load. Any given motor will have different max amp draw depending on the propeller that's mounted on it. The maximum...

Flying a hex with a motor out with Arducopter... might be possible, but hasn't been well proven. I've read that they basically locked out a lot of stuff on the H500. It does not want to connect to MP naturally. You have to hack it, and even then, most of it is still locked out. So far it...