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HelicopterFlybarless Rotor Head SystemsbavarianDEMON › Bavarian 3SX Final trim setup
06-26-2015 02:36 PM  35 months agoPost 1
Jim Cimino

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NE Pennsylvania

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Ok, no one answered my last post, so let's try something different. What is the correct way to trim the helicopter once you are flying it. I know many FBL units do not want you changing anything on the radio after setup. I have just a very slight drift to the right on my turbine and wondered if I can use any of the radio trims, or set it mechanically. It is VERY slight.

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06-26-2015 04:34 PM  35 months agoPost 2
Santiago P

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South West, Ohio

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I begin by mechanically setting the tail pitch slider in the middle of the range which in most well designed helicopters corresponds to correct hover tail pitch.

I make sure my radio and trims zero to correspond to the FBL program, (see DIAGNOSE menu)

Then I also check for any stupid tail mixing the radio could have in its default program and take it out if any. This is actually step 1 in the whole process.

Trimming tail in flight: If I see a consistent drift I adjust that long thing called "tail pushrod" accordingly (really technical stuff LOL) until no more drift. Re-check program tail endpoints to ensure no binding if you went to the stops.
(I actually use a pitch gage on the tail to make sure I am not setting too much pitch and stall the t/r)

If the drift continues I look for something in the tail drive that may cause a t/r slip, or pitch slider excessive friction.

====================================================

Sorry I did not see your other post, Speed Cup work is kicking my arse.

You said you had a quick tail kick every once in a while. My best guess is the drivetrain or tail may be experiencing a harmonic vibration that is causing it.

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06-26-2015 06:13 PM  35 months agoPost 3
Jim Cimino

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NE Pennsylvania

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Santiago,
As far as the tail, the helicopter looks rock solid most of the time and I flew it multiple time yesterday without an issue, it only happens occasionally, but makes me nervous when it does. The drift I am talking about is in cyclic, not the tail. The tail is good in both normal an HH.

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06-27-2015 02:33 AM  35 months agoPost 4
Santiago P

rrProfessor

South West, Ohio

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Drift in cyclic:
2 choises, you can correct it on the pushrods or the software using the servo trim feature.

Santiago

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06-27-2015 02:58 AM  35 months agoPost 5
Jim Cimino

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NE Pennsylvania

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It is so small I will try a 1/2 turn on each aileron servo.

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HelicopterFlybarless Rotor Head SystemsbavarianDEMON › Bavarian 3SX Final trim setup
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