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BeastX FBL System BeastX FBL Flybarless System Software and Hardware Support


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Old 09-14-2014, 08:39 PM   #1 (permalink)
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Default Cyclic pitch geometry setting

OK, so I have set my servos to 90* and mechanically leveled the swash and mechanically set the blades to 0* but when I get to the cyclic pitch programming I set the pitch to 6* and do not get a blue light. I was told to just leave it at 6* despite the light color but I just don't understand why.? The servo horns are 90 and the head is mechanically perfect. Why???
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Old 09-14-2014, 09:14 PM   #2 (permalink)
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Well you're right, you have to set it to 6 degrees, as the MB needs to know what 6 degrees is, so that it can work out what all other angles are, including for when it makes a correction, and for when it determines, via flight mode choices, how sensitive it will be, amongst other things, such as internally setting its gain control, etc.

The colour of the light refers to the resolution of the whole system controlling the head, and in order for the FBL controller to have good accurate control, it must fall within a certain range. They call it head geometry, but they really mean resolution.

By resolution we are refering to the ratio of travel in terms of blade pitch change for a given amount of servo rotation.

Imagine if turning your servo arm through only 5 degrees made the blades go from 0 to +12 degrees. This would give the FBL unit very poor control, and the pitch at the blades would probably change a whole degree for the smallest of changes being attempted by the controller.

On the flip side, imagine if to change the head by only 1 degree on the blades that you had to turn the servo through 90 degrees. In this situation you would have far too much resolution, and the servo, and thus the controller would only be able to change the blade pitch by a couple of degrees or so in total.

Extreme examples to make a point, but somewhere in the middle is a balance, and this is displayed to you by the colour of the lights. Going blue at exactly 6 is perfect. If it is red, it is good enough, especially if it goes blue soon after. I mean you still set it to 6, but you can press on just to see where it goes blue, and then go back. If it is purple or off, then it isn't good enough, and the controller just won't have accurate enough control over what is going on in flight, to give you the excellent performance you desire.

What colour is yours at 6, and what angle do you have when it goes blue?

Moving in one hole on each servo horn will usually skip you along a colour towards blue, because this give the controller the extra accuracy of control that it is looking for, since the head, or blades, will now move less for a given rotation at the servo.

Cheers

Sutty
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Old 09-15-2014, 02:13 AM   #3 (permalink)
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Default I'm confused...

Edited: I'M the one confused. Other comments deleted. Sorry.

Highspeed
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Old 09-15-2014, 07:14 AM   #4 (permalink)
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The light is purple at 6* but right on the edge of turning red. I think it is about 7.5*. Should I move the balls in to the next hole as you suggested?
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Old 09-15-2014, 07:55 AM   #5 (permalink)
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Yes, it will be comfortably red then and maybe even blue at 6.
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Old 09-15-2014, 12:54 PM   #6 (permalink)
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Thanks I will give it a try when I get home.
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Old 09-15-2014, 02:18 PM   #7 (permalink)
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Another quick question, does the BX have a preference as to where the tail pitch slider is located for tail set-up? Does the slider need to be centered? Or does it matter?
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Old 09-15-2014, 04:25 PM   #8 (permalink)
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Quote:
Originally Posted by mossyhorn9 View Post
Another quick question, does the BX have a preference as to where the tail pitch slider is located for tail set-up? Does the slider need to be centered? Or does it matter?
The BeastX is of secondary concern in this case. Getting a good mechanical setup is always first and foremost - on the tail as with any other part of the heli.

If you do not have a properly centered slider (as near as you can) you will have limited travel in one direction or the other. In my case, I did not have enough slider movement in the direction of the boom and so the end-point setup did not register this as sufficient movement.

As is common with many of the Align (and the various flavors of clones) setting the neutral point in Rate mode puts the slider off-center and you run into the situation of limited travel. To correct this you can do the "grip flip" mod. You can search for that in this forum, but the essentials are that you rotate the grips 180 degrees so that the pitch control link is now on the trailing edge vs. the leading edge (or the other way around, I am writing this from memory at the moment) and of course reverse the blades in the grips to keep them flying in the correct direction. You will also need to reverse the rudder channel in your transmitter, the sense direction on your tail gyro/FBL Controller or both.

This puts the tail rotor blades at (or very near) the correct pitch at center slider. You can then fine tune it to a good Rate mode hold. You'll find this helps get a better HH mode lock on the tail as well.

Highspeed
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