150x rudder turn heli drifts backwards - HeliFreak
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Old 10-05-2017, 06:19 PM   #1 (permalink)
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Default 150x rudder turn heli drifts backwards

I am relatively new to helis but fly good with my trex 500 and my oxy3. Mild aerobatics and inverted hovering. The Trex 150x is killing me. I detuned it so it would be a little slower. When I turn using the rudder it turns but has a
STRONG backwards drift. What would cause this? I have no idea where to start with fixing this. Broke some servo gears with my flight today so have to wait on some parts to come in before I can fly some more, but was hoping someone would have some suggestions to what I need to do to correct this.
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Old 10-06-2017, 12:21 AM   #2 (permalink)
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Could be that your servo gears were already damaged before the flight today? Otherwise, I'd would try increasing cyclic gain. Can you post your GRS config file? I can take a look on it and see if I find something weird...
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Old 10-06-2017, 03:53 AM   #3 (permalink)
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Hey buddy.

This pirouetting drift can be caused by the centre of gravity being out on a heli, it's know the T150 can be tail heavy and so this makes it harder for the FBL controller to maintain position during a piro.

It might be worth checking the model hangs level and if not adding weight to the nose usually to counter balance the tail motor and trying it again to rule it out.

Another idea, is your tail perpendicular to the main frame? I've not known it to be a problem as the tail boom self aligns, but if the tail is pointing up or down slightly, the yaw thrust could push the tail up or down depending on which way it's angled and effect the models ability to stay level.

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Old 10-06-2017, 06:07 AM   #4 (permalink)
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A unleveled swash may cause severe drift during pyro...
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Old 10-06-2017, 07:14 AM   #5 (permalink)
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Quote:
Originally Posted by johnniechang View Post
A unleveled swash may cause severe drift during pyro...
+1.. that was the first thing that came to my mind. The FBL controller usually does a good job of compensating for an out of level swash while hovering but it show up in pirouettes and other manoeuvres..
The CG issue that Ian mentioned is also worth ruling out but as all T150's are very tail heavy this alone might not be the full explanation.
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Old 10-06-2017, 10:00 AM   #6 (permalink)
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Thanks everyone. I will check all these issues as soon as I have a chance
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Old 10-07-2017, 06:32 AM   #7 (permalink)
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Quote:
Originally Posted by johnniechang View Post
A unleveled swash may cause severe drift during pyro...
Quote:
Originally Posted by Grumpy_Old_Man View Post
+1.. that was the first thing that came to my mind. The FBL controller usually does a good job of compensating for an out of level swash while hovering but it show up in pirouettes and other manoeuvres..
The CG issue that Ian mentioned is also worth ruling out but as all T150's are very tail heavy this alone might not be the full explanation.
Hey Guys.

Good points, an unlevel swash plate would cause drift, but this will be evident even without commanding a pirouette.
So this leads us to another question, does the model hover as hands off as can be expected for an RC heli, or does it require constant pilot input (cyclic stick held a little off centre) to maintain position even when just hovering?
Zimmerdesignz hasn't said if the model is trimmed to keep level when not pirouetting, so if out of trim here that would be the answer.
We can only assume the model is trimmed when in a stationary hover.

Of course if the model is out of trim in a stationary hover, the FBL unit won't trim this out unless you are using a position hold feature (150X?) or GPS hold. It'll only compensate for outside forces causing a reaction on the models fuselage, outside of any position holding feature.

Scott keep us posted buddy on what you find.
On the side are you part of the Zimmerman exhaust guys?

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Old 10-07-2017, 10:08 AM   #8 (permalink)
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Hovers well in advanced mode. Can not even think about putting it in hold mode/recovery. If you do it strongly goes hard left and a little backward. But Advanced mode hovering is good.
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Old 10-07-2017, 11:14 AM   #9 (permalink)
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Quote:
Originally Posted by zimmerdesignz View Post
Hovers well in advanced mode. Can not even think about putting it in hold mode/recovery. If you do it strongly goes hard left and a little backward. But Advanced mode hovering is good.
Hey Buddy.

Ah good, so that helps visualise that the swashplate is setup level then, as if not the model wouldn't want to sit nice in the hover.
I'm guessing, not having flown a 150X yet with the added features, that advanced mode is without any training or stability aids? So there is no artifical help keeping the model level.

Interesting about the model wanting to deviate off it's current heading in hold/recovery mode, as I would assume it would lock into position where the pilot flicks the switch. This could point to a neutral setting problem. I'll have to skim over the setup of these modes to see if there is any calibration steps that need to be done to make them work effectively.

If you try some of the other ideas keep us posted.

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Old 10-07-2017, 11:21 AM   #10 (permalink)
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Servo gears will be here Tuesday so I will be able to report more back then. Some one asked if tail boom was straight and level or bent. It is straight.
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Old 10-07-2017, 11:27 AM   #11 (permalink)
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I still think it's worth checking the swash for level. A while back i'd had a servo arm off on my Trex 600 and carelessly put it back on the wrong spline making the swash miles out of level. Surprisingly the heli still hovered ok, no noticable drift, but when i did a piro the tail dropped and it was all over the place.
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Old 10-11-2017, 12:53 AM   #12 (permalink)
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SWASH PLATE. it had just enough lean backwards that it compensated when hovering but drift when turning with rudder. Thanks for the help.
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Old 10-11-2017, 01:19 AM   #13 (permalink)
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Quote:
Originally Posted by zimmerdesignz View Post
SWASH PLATE. it had just enough lean backwards that it compensated when hovering but drift when turning with rudder. Thanks for the help.
Awesome news, I'm glad to hear you've sorted it out.

It's interesting though, must have been so small you weren't seeing it while hovering.

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