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thestunt23 · 05-27-2007, 08:22 PM

OK I have a newly built T-Rex 450SA 401 gyro and HDS-877 for tail servo. On the 401 I have it set to digital servo and delay set to 0. I have the limit pot set to where it does not bind anything.

If I pop off my tail servo rod I can manually move the slider nice and free with no sticking. When I am hovering, something is causing my rex to rudder hard about 45-90 deg then come back really quick. It happens a lot during a hover. It will do it maybe 6 or 7 times per min of flight. It is almost like a glitch but I am using a DX6 and AR6000 setup. It always goes the same way nose to the right, every time.

I noticed if I switch it to rate mode while i'm flying the twitch will not happen.

What can be causing this, any ideas?

valsalva · 05-27-2007, 08:32 PM

Have you tried different gain settings on your tx??

thestunt23 · 05-27-2007, 08:41 PM

I haven't tried that. I have it set so it holds good without wag. Can the gain setting cause that?

whtmex · 05-27-2007, 09:08 PM

Check your tail casing. If the back 3 screws aren't tight enough, or there's any gap in the case at the area where the tail shaft and bearings are, the shaft can slide in and out between the bearings, this can cause very minute uncommanded pitch changes in the tail particularly in HH mode because the Gyro is always putting some kind of correction into the tail.

Just an idea. I've seen it before. Hell, I've done it before.

valsalva · 05-27-2007, 09:15 PM

If you've already set it for no wag, then I'm not sure. It just sounded like what you were describing could possibly be caused by too high of a gain setting. What number are you at with your gain? I'm guessing it could also be a servo issue. I'm still pretty new, but that's my 2cents.

valsalva · 05-27-2007, 09:19 PM

whtmex posted while I was typing at a snails pace. I knew someone else would have a much better possible solution. Disregard my post.

thestunt23 · 05-27-2007, 09:49 PM

valsalva- My gain setting is the same for rate and HH 50%. Tail holds strong and does not wag, rock solid.

whtmex- I think I have a small gap on the top of the casing from tightening the bottom more then the top. I will loosen them all up and tighten them even and see what happens.

Thanks guys.

05-27-2007, 08:22 PM	#1 (permalink)
thestunt23 Join Date: Apr 2007	Tail twitches in flight OK I have a newly built T-Rex 450SA 401 gyro and HDS-877 for tail servo. On the 401 I have it set to digital servo and delay set to 0. I have the limit pot set to where it does not bind anything. If I pop off my tail servo rod I can manually move the slider nice and free with no sticking. When I am hovering, something is causing my rex to rudder hard about 45-90 deg then come back really quick. It happens a lot during a hover. It will do it maybe 6 or 7 times per min of flight. It is almost like a glitch but I am using a DX6 and AR6000 setup. It always goes the same way nose to the right, every time. I noticed if I switch it to rate mode while i'm flying the twitch will not happen. What can be causing this, any ideas?

05-27-2007, 08:32 PM	#2 (permalink)
valsalva Registered Users My HF Map location Join Date: Mar 2007	Have you tried different gain settings on your tx?? __________________ ____________________________________ Nitro, the smell of fun.

05-27-2007, 09:15 PM	#5 (permalink)
valsalva Registered Users My HF Map location Join Date: Mar 2007	If you've already set it for no wag, then I'm not sure. It just sounded like what you were describing could possibly be caused by too high of a gain setting. What number are you at with your gain? I'm guessing it could also be a servo issue. I'm still pretty new, but that's my 2cents. __________________ ____________________________________ Nitro, the smell of fun.

05-27-2007, 09:19 PM	#6 (permalink)
valsalva Registered Users My HF Map location Join Date: Mar 2007	whtmex posted while I was typing at a snails pace. I knew someone else would have a much better possible solution. Disregard my post. __________________ ____________________________________ Nitro, the smell of fun.

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05-27-2007, 08:41 PM	#3 (permalink)
thestunt23 Thread Starter Join Date: Apr 2007	I haven't tried that. I have it set so it holds good without wag. Can the gain setting cause that?

05-27-2007, 09:08 PM	#4 (permalink)
whtmex My HF Map location Join Date: Mar 2007	Check your tail casing. If the back 3 screws aren't tight enough, or there's any gap in the case at the area where the tail shaft and bearings are, the shaft can slide in and out between the bearings, this can cause very minute uncommanded pitch changes in the tail particularly in HH mode because the Gyro is always putting some kind of correction into the tail. Just an idea. I've seen it before. Hell, I've done it before.

05-27-2007, 09:49 PM	#7 (permalink)
thestunt23 Thread Starter Join Date: Apr 2007	valsalva- My gain setting is the same for rate and HH 50%. Tail holds strong and does not wag, rock solid. whtmex- I think I have a small gap on the top of the casing from tightening the bottom more then the top. I will loosen them all up and tighten them even and see what happens. Thanks guys.

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