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250 Class Electric Helicopters 250 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar. |
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07-30-2014, 11:46 AM | #1 (permalink) |
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Join Date: Jan 2013
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3GX MRS PROBLEM?
Hi.
I have just received my 250 Plus BTF. After binding it to my DX8 the rudder keeps going to the left by itself. When hovering I need to give constant right rudder to keep it straight. All settings are as per the manual and sub trims are zero. Is this a faulty MRS or can it be something else? The bird came out of the box with a bent main shaft so I do not have any trust in the QC at align, I just want to sort out this problem. Any help will be appreciated. [ame]http://youtu.be/oA68NIsL-Pc[/ame] Thanks, Morne' |
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07-30-2014, 03:19 PM | #2 (permalink) |
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Join Date: Aug 2011
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What are your gyro gains set to?
With no power set your tail servo arm to 90* and post a picture of your tail blades I suspect you're in rate mode or gain is set too low. Though gain too low will usually allow random drift in either direction, not just one |
07-30-2014, 05:52 PM | #3 (permalink) |
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Join Date: Feb 2013
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You have subtrim or trim in your tx if it is doing that. Go through your tx and check to make sure you remove it and disable flight trims as well so it doesn't happen again.
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Team MSH USA - Cyclone Blades MSH Prôtos 380 Brain 2 MSH Prôtos Max V2 Brain |
07-31-2014, 12:38 AM | #4 (permalink) |
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Join Date: Apr 2014
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Sounds like you are in rate mode. Mine was set per the numbers but ended up having to increase gain way above recommend value.
Need two green LED's on MRS.
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Marc Norman, OK - Synergy N7, TREX 700N DFC, TSA 700N, TSA 600N, Trex 550, Trex 500 ESP (FBL), 450L, RCHN - 700 |
07-31-2014, 08:23 AM | #6 (permalink) | |
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Join Date: Apr 2014
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Quote:
This is one. Basically if you don't put it in heading lock mode you have to manually controll the tail. And the tail moves according to pitch and head speed changes. So every move of the throttle requires input to the rudder. In my case it would move on the ground or in the air. On the ground I believe it tried to move because it was spooling up. Once I got head lock on, two steady green LEDs on, that stopped. However the tail will move during spool up if the tail rotor pitch isn't neutral. Which is fine if you are gradual and can correct it.
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Marc Norman, OK - Synergy N7, TREX 700N DFC, TSA 700N, TSA 600N, Trex 550, Trex 500 ESP (FBL), 450L, RCHN - 700 |
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07-31-2014, 09:14 AM | #7 (permalink) |
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Join Date: Feb 2013
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Check your radio it's nothing to do with rate/head holding modes. You shave trim or subtrim on your rudder I'm very willing to bet.
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Team MSH USA - Cyclone Blades MSH Prôtos 380 Brain 2 MSH Prôtos Max V2 Brain |
07-31-2014, 10:49 AM | #8 (permalink) | |
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Join Date: Apr 2014
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Quote:
I set mine to align's recommended gain and it was in rate mode. I increased the gain and it changed to heading lock mode. That's all I'm saying.
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Marc Norman, OK - Synergy N7, TREX 700N DFC, TSA 700N, TSA 600N, Trex 550, Trex 500 ESP (FBL), 450L, RCHN - 700 |
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07-31-2014, 11:07 AM | #9 (permalink) | |
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Join Date: Feb 2013
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Quote:
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07-31-2014, 11:42 AM | #10 (permalink) | |
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Join Date: Apr 2014
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Quote:
And I definitely agree rate mode does not cause the slider to move like that. I thought OP meant moving while on the ground spooling up.
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Marc Norman, OK - Synergy N7, TREX 700N DFC, TSA 700N, TSA 600N, Trex 550, Trex 500 ESP (FBL), 450L, RCHN - 700 |
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07-31-2014, 12:00 PM | #11 (permalink) |
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Thread Starter
Join Date: Jan 2013
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Thanks Marc and VTown for the replies.
I'll go over all the settings again, it usually is the smallest thing that mess around. Will check for Rate v HH Will double check all trims and subtrims. |
07-31-2014, 12:21 PM | #12 (permalink) |
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Join Date: Feb 2013
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Once you get it sorted out and flying, setting up the tail to hold in rate mode for me and a few others helps with tail kick in hh if flying the stock tail servo. I have flown the ds95i and currently 5084mg and they have so much torque it doesn't matter.
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Team MSH USA - Cyclone Blades MSH Prôtos 380 Brain 2 MSH Prôtos Max V2 Brain |
06-26-2015, 11:13 AM | #13 (permalink) |
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Join Date: Apr 2007
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I have your exact same problem. the tail slides to one side even it is at the ground and while all my subtrims are set zero.
I then go through the 6 steps gyro setting one more time and set the left and right rudder travel limit. (page 25 of manual) Then it's fixed. Hope this help. |
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