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Posted by rsl360 | Nov 13, 2017 @ 08:35 AM | 1,185 Views
Just some notes on the SAFE receivers from Spektrum. (under construction)

AS3X mode, (aka stability, ??), pretty much the same as all the rest. Just seems to work.

SAFE mode, (aka self leveling, panic mode, ??), has it's own differences from the other manufacturers.
-Three modes, beginner, intermediate and off. These are carried on channel 5. (gear)[*]-Beginner is the full self level mode. With no hands on the sticks, the plane will self level. With hands on the sticks, the plane will mix in the self level commands, eventually overriding your input. This will not stop you from crashing the plane, but it will stop you from rolling or looping the plane. It won't stop you from diving into the ground.
-Intermediate. "limits bank angle and ???". Close study reveals this to be a bit odd. Basically, you have full control of the plane until you exceed a certain bank or pitch angle. Once you hit that angle, you can only make corrections towread more level. and the plane will also do it. (this needs a better explanation.)
-Panic mode. Channel 6 (aux 1)
-Obviously, this levels the plane. But it also takes over for about 1 second, no matter how short the button press.
Posted by rsl360 | May 11, 2017 @ 05:26 PM | 2,109 Views
It took me a while to figure out how the Frsky S6R stabilizer works, but I'm pretty sure I've got it now. (still rough draft.)

1- It seems to me as if the setup is "backwards", with stability being applied to a "normal" receiver.
With other stabilizers, the stabilizer drives the plane based on your inputs. With this one, you drive the plane, and the stability is applied on top of your inputs. Something like that, it's hard to explain.

2- The absolute motion limits for the stability takes it's motion limits from the most it's ever seen on the channel, (pwm) signals.
So that step where you move all the sticks to their max, (ex thr), is where this happens. You can easily see/test this. After a reset, just move the sticks a tiny bit. Then move the plane around and watch the corrections, they will be small. Now move the sticks the full travel, the stability corrections will increase. Or, just move one channel, and you will only get corrections on that channel. (There seems to be no time out on "taking" this reading. the S6R will never exceed what it's seen for the max travel. At least I have not seen any. Also, I don't see the throttle as putting an end to this, again, not in my version. (most recent available as of july, 2017)) It's really easy to forget to do this and think something is busted, especially if you have not flown the plane in a while.

3- The gain, channel 9, only does wind stability. (the...Continue Reading
Posted by rsl360 | Sep 08, 2016 @ 08:26 AM | 3,102 Views
There is a sensitivity setting for the Hobby Eagle A3 super II. It seems to work best set for "low".
Posted by rsl360 | Aug 19, 2016 @ 04:33 PM | 2,110 Views
Even yet more on stabilizers

Someone on rcgroups has suggested that you can mount an AS3II without it being aligned fore/aft. Maybe I don't understand what he is saying, but it seems totally bogus. I did an experiment where I actually did this, and as expected, there were massive amounts of cross talk between the pitch and roll corrections when the plane was moved.

If the plane is pitched down, the elevator tries to correct for it, as it should. But the ailerons also react, rolling the plane. Of course, once the plane is level fore/aft, the wings should also level out. This is just confusing to think about.
Posted by rsl360 | Aug 17, 2016 @ 07:09 PM | 2,081 Views
Someone was asking about the order that the stabilizer applies corrections in. That is, does it do roll, then pitch, or all at once, or what. The question came up about the Hobby Eagle A3 SuperII, but I suppose it applies to anything with a 6 axis system

In a static environment, (I hold the plane and move it around), it appears that all the corrections are done at the same time, although there is an exception. If I hold the plane nose down, with some roll, the elevator and aileron both try to correct it, and the correction is virtually immediate. I see no difference in the order that they are applied.

But there is an exception, as mentioned. If the plane is inverted, there are multiple solutions to getting the plane upright. If you are flying level, but inverted, you can:
a- roll the plane upright.
b- Use full down elevator and do an outside loop.
c- Use full up elevator and do an inside loop.
The point here is not that one of these is better than the other. The point is that a choice has to be made. Computers are stupid, they only do what they are told.

A shallow dive might be, say, 10 degrees. A steep dive would be 85 degrees. In either of these situations, the software can tell give the plane up elevator to return to level flight. But, what happens when the plane is in a "95" degree dive. Basically, slightly inverted. Well, in this case, the gyro first roll the plane with the ailerons, and then applies the elevator. So when the plane is inverted, the gyro does apply one correction before the other. If you did not do that, I can imagine a case where the ailerons would apply one correction, and the elevator another, and when all done, the plane is still inverted.
Posted by rsl360 | Jul 11, 2016 @ 06:20 PM | 2,370 Views
Installed a Hobby Eagle A3II in my Apprentice. Seems to work well. Plenty of controversy about how well these work and what they do. I like it because as a new pilot, I don't have to pay attention every single second. Just let go of the sticks and it flies level. (in autobalance mode)

Turning in auto-balance mode, with the sticks in auto. ("angle mode")
So, you roll the plane with the ailerons, no problem. But now you try to give it some elevator to "turn" the plane, as you would normally do. Not so much happens. Pretty hard to turn. So, what some have suggested to be happening here is that the plane is trying to do a sort of knife edge. If you give it elevator, what you are really asking for is for the stabilizer to point the fuselage "up" more. To climb. Need to test this and see what it really does. On the other hand, it turns like mad with the rudder. Perhaps I'm getting full rudder for very little input?

OK, tested it. If you hold the plane at a steep roll angle and give it some elevator, that's what you get- elevator. No rudder as some have suspected. So it looks like each channel can only operate on it's own control surface. (theoretically, if you are flying a full knife edge, and call for up elevator, the rudder should take over and do that. At least that's what some folks think. But it does not.) Could be that the basic stabiliztion is fighting the turn. If you give it aileron and elevator, that is turning the fuselage, and the normal stability might oppose that. Time for more testing.