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04-20-2020 05:32 PM  42 days ago
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Tim W

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So confused!!!!
Okay my fellow heli folks. This is making me scratch my head! I have a Roban 700 size Bell 429. And recently I have experienced a weird issue with my tail rotor. What’s going on is intermittently I am losing my right pitch. At first I thought that it might be binding somehow? But after checking all the linkage and moving it both right to left it is free as can be. Then I checked the radio on monitor function (Spektrum DX7S) and everything looks good. Then the next thing I checked with the receiver battery hooked up I moved the helicopter left to right to see if the Gyro is functioning correctly. And it is. I am running the Spektrum BeastX. So when the heli is in flight occasionally I will lose tail rotor Authority when using the radio trying to move to the right. I also know that it has nothing to do with the radio because all my other helicopters function fine. So now I’m going nuts trying to come to some conclusion as to what the problem may be? Any ideas are welcomed.
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04-20-2020 05:43 PM  42 days ago
BeltFedBrowning

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Kansas City

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Is the linkage pushing or pulling on the tailrotor bellcrank when turning to the right?
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04-20-2020 05:49 PM  42 days ago
Tim W

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I believe it is pushing.
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04-20-2020 05:50 PM  42 days ago
BeltFedBrowning

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I had a problem before when pushing, too much of the linkage was unsupported and would bend when pushing. Pulling is not an issue in this instance.
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04-20-2020 06:04 PM  42 days ago
Tim W

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Hmmmm? I will double check that. But I did move it back and forth without and resistance noted.
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04-20-2020 06:05 PM  42 days ago
BeltFedBrowning

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There is a lot more to push against when in flight. Enough to flex the linkage.
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04-20-2020 06:08 PM  42 days ago
BeltFedBrowning

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To check mine, I will hold the servo horn with my hand and try to turn the tail blades to change the pitch. Watch the linkage when you are doing this to see if it flexes.
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04-20-2020 06:25 PM  42 days ago
BeltFedBrowning

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Imagine it this way. You can pull a bus with a rope, but try to push anything with a length of rope.
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04-20-2020 06:29 PM  42 days ago
Tim W

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This makes a lot of sense. I’m going to check this.
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04-20-2020 07:28 PM  42 days ago
Tim W

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Another thing that puzzles me is when I had the receiver battery plugged in and was using the radio it would sometimes not respond to right rudder input? But this was very intermittent? So there was no resistance on the tail rotor like there would’ve been if it were in flight.
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04-20-2020 07:33 PM  42 days ago
chopper37

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Have you tried a different servo?
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04-20-2020 07:50 PM  42 days ago
Tim W

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No I haven’t
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04-20-2020 07:55 PM  42 days ago
chopper37

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It’s worth doing a bench check with a spare servo
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04-20-2020 08:35 PM  42 days ago
Tim W

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Yeah, that’s another thing I am thinking. However I don’t have any spare servos laying around.
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04-20-2020 08:39 PM  42 days ago
lt1pwr

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Tim W I don’t have any spare servos laying around.
Can you switch the tail servo lead to another channel on your receiver or FBL to test it?
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04-20-2020 09:10 PM  42 days ago
Tim W

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I’m not sure, but it’s worth looking into.
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04-21-2020 03:22 AM  42 days ago
Girard Ibanez

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Is this a new problem?

If so and nothing changed perhaps your servo is not holding. Have you tried to apply manual torque to see if the servo is holding?

Also, a low rotor head speed and also reduces the tail rotor rpm. You can increase the head speed and see if the problem goes away. If it does and you want the low head speed you might want to increase the tail rotor length or cord. Or change the gear ratio.

Just poking at other solutions.

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04-21-2020 03:26 AM  42 days ago
Girard Ibanez

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Tim W Another thing that puzzles me is when I had the receiver battery plugged in and was using the radio it would sometimes not respond to right rudder input? But this was very intermittent? So there was no resistance on the tail rotor like there would’ve been if it were in flight.
This one is puzzling ... intermittent...difficult to repeat.

Team Thunder Tiger
since 6/2005 to 12/2014
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04-21-2020 03:29 AM  42 days ago
Tim W

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Girard Ibanez Is this a new problem?

If so and nothing changed perhaps your servo is not holding. Have you tried to apply manual torque to see if the servo is holding?

Also, a low rotor head speed and also reduces the tail rotor rpm. You can increase the head speed and see if the problem goes away. If it does and you want the low head speed you might want to increase the tail rotor length or cord. Or change the gear ratio.
Yes, this is a new issue that I’ve never had before.
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04-21-2020 04:32 PM  41 days ago
Tim W

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BeltFedBrowning Is the linkage pushing or pulling on the tailrotor bellcrank when turning to the right?
Just an update on my tail rotor linkage. I checked it and when turning right it is pulling not pushing.
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