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Old 06-06-2021, 06:52 AM   #1 (permalink)
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Join Date: Apr 2007
Location: Canberra, Australia
Default Heli drifts backwards

Hi All,

I have a Soxos DB7 running a CGY750. The heli is nose heavy, but when hovering will drift backwards. When inverted, it behaves as it should being nose heavy and drifts forwards.

Swash has been levelled using a Soko tool.
Full pitch climb outs are straight up.

I have even gone to the extent of deliberately tilting the swash forwards by extending the servo links, but it still ends up drifting backwards.

Does anyone have any suggestions on what to change?

Thanks.
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Gaui NX7 | Soxos DB7 | SAB Goblin Fireball 280 | Controlled by JR XG14
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Old 06-07-2021, 12:34 PM   #2 (permalink)
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Anytime I have experienced drift it was a vibration issue. I ran into this on a helicopter 2 years ago. I tried all sorts of things.

In the end loosening the blades just a little bit did the trick.
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Old 06-07-2021, 11:09 PM   #3 (permalink)
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I would also take a look at your head gain. Stock is 50, and I found on 3 seperate units that the head gain is happier around 65-75. I had drift issues on an nx4 and a N5c. I replaced links and though let it solved the issue but still had a slight drift. once I increased the head gain it solved it.
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Old 06-09-2021, 05:28 AM   #4 (permalink)
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My HF Map location
Join Date: Apr 2007
Location: Canberra, Australia
Default

Thanks Guys.

Never experienced such a specific drift before. I have seen drifting in all directions due to vibration, but not just "back elevator"

Base gain on the CGY is the default of 100%. Gain is then controlled via a trim switch on my radio. On the weekend I increased the gain till I was getting noticeable oscillations on fast forward flight, but when brought back to a hover, it still drifted back.

The main blades are not as tight as I usually run. I have also tried 3 different sets of blades (1x AZ700, 2x 1st 690 blades)
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Nigel

Gaui NX7 | Soxos DB7 | SAB Goblin Fireball 280 | Controlled by JR XG14
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