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What if I told you that a 600 heli running 2400rpm head speed, which is very aggressive, cannot physically respond to any control signal at faster than 80Hz? As in, it's impossible. A helicopter can only exert a rolling torque for example, when the blades are oriented to the sides. At 2400...

Exactly. It will never be "stable" unless you stop working on it. And if you stop working on it, that does not mean it's better. It just means you're ignoring problems.

Yes, it all goes back to Chuck's comments which were great. Particularly the point about identifying your goals and requirements first, then designing from the ground up to meet those. Just as I discussed in my video. And then when you do that, you'd see than an X8 is not less efficient than...

Personally, I think quads and X8's are where it's at.

Nope, not at all. I actually don't have much about them, even though they are close to me. I actually plan on trying to contact them soon. It's looking like I'll be getting out of the Arducopter world and looking for other opportunities. So, the thing is, you say that notch filtering would...

Denny, the fact remains that you still have no idea what you're talking about as regards 3DR and Arducopter. This is just another in a rant in a long history of same, where the facts are either incorrect or just made up. Long list of revisions: Can you show me another flight control system...

gtranquilla, you're talking about a few different things at once. First, if the vibration is so intense that it is over the measurement limits of the sensor, you're done. There's no need to talk about a filter, etc.... it's going to crash, period. That's a whole other problem. So, you...

That is more or less it. Think about it this way. Do you know why AC current is 60hz? It's because it's so fast, that your eyes cannot see the light filament going dim and bright as the AC voltage fluctuates. So that's 60 hz. So fast, that your eyes can't even see it. Now, can you imagine...

It doesn't have to do with the IMU, filtering, etc. It's just the physical truth that aircraft cannot possibly respond at a rate faster than that.

HA! AC91-57 is now uncancelled. Apparently it was all a big mistake. Your tax dollars at work folks. ;) http://www.suasnews.com/2014/10/31829/ac-91-57-cancelled-in-error/

To the contrary, in our experience, effective vibration filtering (both mechanical and electronic) is key to good flight performance. Lots of people like to talk about high frequency control, but they would be surprised if they actually tested this as they would find that the response bandwidth...

I can't really speak to the relative quality between the brands. But the customer support is very different. With most of the clones, if the same thing happened, you'd just throw it in the trash and buy another as they offer no support whatsoever.

Well, *any* system can be affected by this, so no need to wait for DJI to answer. The question should be "is this the cause of these problems?" The test that was done where the person played back the sound file on a shaker table and the system misbehaved is pretty good evidence it is causing a...

SolidSalad, Arducopter provides you all the information you need to figure out why it is not arming. So complaining that it won't arm, without providing that information, makes this more of a rant than a plea for help. Where are your logs? What is Mission Planner telling you? Nobody can help...

soler, I can't speak for DJI's system, but I for the sensors we use, I believe the hardware sample rate can only be set at bootup. But assuming that isn't the case, could we adjust the sample rate to "hunt" for a non-aliasing filter rate.... it's an interesting idea, but I've never heard of...

It's coming. We already have ADS-B data that can show up on the ground control station. Now we're working on taking the GPS data coming from the UAV, and uploading it into the ADS-B internet system. So, we won't have ADS-B on the UAV as the system is too heavy, but it can be done with the GCS...

So, what is the FAA going to do when we have "sense and avoid" to a higher performance level than manned private aviation? It'll happen within about a year. Won't that expose private aviation as being the true risk that it is?

Yeah... I would bet 333 never would have happened if Pirker hadn't sued. That basically pushed the FAA to do something.

I wouldn't be too concerned, as I'd say your last statement is probably true. I don't really see how this makes it any more legal or illegal than it was yesterday. AC91-57 was just a document that gave voluntary suggestions on how to operate safely. It's not a regulation or standard, so it's...

Shoe just dropped. FAA Cancels AC 91-57: http://www.faa.gov/regulations_policies/advisory_circulars/index.cfm/go/document.information/documentid/22425 It would seem that, at this point, and at least in the eyes of the FAA, all model aircraft activity, including hobby use and paper airplanes...