Disc rotation option

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Home › RC & Power › ✈️Aircraft › 🚁Helicopter › Flybarless Rotor Head Systems › BeastX › Disc rotation option

12-13-2019 10:35 PM 34 days ago

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tgalo

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Disc rotation option

I was playing around in studiox to soften up the sensitivity on my Bell 47 and came across a option for disc rotation. I never have seen that option before. It was set to cw but the machine is ccw rotating. Wondering what effect that would have on things.
ThanksGravity's a bitch ant it?

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12-14-2019 02:46 PM 34 days ago

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BarracudaHockey

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Jacksonville FL

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If you don't need to adjust the phasing I don't reckon it matters.

If you have to fiddle with the phasing then things could get quite entertaining if its set wrong.Andy
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http://www.jaxrc.com

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12-15-2019 07:57 PM 32 days ago

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Phoenix NOTAR

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I do not know about BeastX, but in other systems it changes the direction of tail compensation.

Sandy

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12-15-2019 08:10 PM 32 days ago

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BarracudaHockey

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Ah yes, I forgot about tail comp since its been so long since I messed with it, that would be backwards as well if you don't have the rotation correctAndy
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12-15-2019 09:35 PM 32 days ago

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tgalo

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Ok that makes sense. It's a 800 size Bell 47 so I have no tail pre-comp set and dont think I ever pumped the collective on it...lol ThanksGravity's a bitch ant it?

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12-17-2019 02:02 PM 31 days ago

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Richardmid1

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Leeds, England

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You can set the direction of the tail pre comp aswell so I don't see why there is a rotation option? Although the heli will tilt the opposite way as the cyclic compensates for the tail thrust, maybe that's why.60% of the time, it works every time!

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12-17-2019 05:53 PM 31 days ago

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BarracudaHockey

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Jacksonville FL

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Swash phasing, like I said earlier.Andy
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http://www.jaxrc.com

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12-18-2019 11:08 AM 30 days ago

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Richardmid1

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Leeds, England

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But forwards is still forwards and backwards is still backwards etc. surely?60% of the time, it works every time!

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12-19-2019 03:32 AM 29 days ago

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Phoenix NOTAR

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Andy, as I see it the FBL system as no direct connection between rotor direction and phasing.
Phasing is set by the operator to a position so that the “blade over the boom does not move with an elevator command”. That swash plate phasing position is only correct based on the rotor rotation direction, and pitch link position on the blade grip and swash plate.
It does not matter if the FBL system calls the phased position “+” or “-“, 10 degrees or 40 degrees. It is just the amount of phase mixing needed to have the swash plate tilt on the axis where the pitch link to the blade grip over the boom is located.
I do not see where rotor direction and phasing would be used in any FBL flight or programming calculations.
Please let me know if you believe I am mistaken.

Sandy

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12-19-2019 11:16 AM 29 days ago

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Richardmid1

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Leeds, England

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Even if the phasing was out the gyros would compensate anyway.60% of the time, it works every time!

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12-19-2019 12:43 PM 29 days ago

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Phoenix NOTAR

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"Even if the phasing was out the gyros would compensate anyway"

If the phasing is out, the gyros TRY to compensate, but the input to the swash plate will be wrong. So, the heli will move even more in an unintended direction, the swash plate correction is still wrong to correct this, and the circle of incorrect inputs and reactions continues.

An extreme example of a similar situation is having the tail gyro direction backwards. We probably all know what that is like when the model gets light on the skids just before lift off...

Sandy

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12-19-2019 01:31 PM 29 days ago

0Post 12

Richardmid1

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Leeds, England

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The gyros are correcting constantly anyway 200 times a second so it makes no difference to them. It's not ideal but it would work. I'm not talking 45 degrees plus out of phase but under 45 degrees it would probably cope and you would hardly notice.60% of the time, it works every time!

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12-19-2019 02:01 PM 29 days ago

0Post 13

Phoenix NOTAR

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Richardmid1, lets agree to disagree

I helped someone with a 1/4 scale Vario Bell 47G earlier this year with the mechanical phasing out about 5 - 8 degrees, and using a Axon FBL system. The difference in the flying and control of the heli was dramatic when the phasing was corrected. (Much, much nicer with the phasing corrected).

I suggest you adjust the phasing to be offset in one of your models, and go and fly it and see for yourself, and then report back.

Sandy

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