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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsbavarianDEMON › Bavarian 3SX Final trim setup
06-26-2015 02:36 PM  4 years ago
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Jim Cimino

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NE Pennsylvania

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Bavarian 3SX Final trim setup
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  4 years ago
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  4 years ago
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  4 years ago
Santiago P

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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  4 years ago
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.Team Synergy, Team Scorpion, No good deed goes unpunished
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