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Spartan RC Spartan RC - Quark, DS760 Gyros and other Spartan RC Electronics Factory Support |
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04-11-2012, 08:35 PM | #1 (permalink) |
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Join Date: Apr 2010
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Random wag...NEED HELP
Ok so I’m having lots of issues with an intermittent tag wail on my Gaui X5, using a Spartan Quark and MKS BLS990 tail servo. I have set the servo up using the Flashlink PC connection, though the only settings I have changed are the servo type and speed (760us and 0.03s/60degrees) and the limit settings. (currently 110% and 72%, with my servo arm ball offset 13.5mm). I have gone through the tips on the Spartan website: http://www.spartan-rc.com/resources/faq/faq.php?topic=20&category=23 And http://www.spartan-rc.com/resources/faq/faq.php?topic=83&category=23 Yet I still can’t solve the issue. I am getting an intermittent tail wag that is really annoying. I have : · replaced the tail shaft · shimmed the tail blade grips to remove all slop without binding and checked that the grips don’t bind whilst pulling outwards · re-loctited the tail shaft bearings into the case · Replaced the torque tube support bearing with two bearings and rubber mounts (align 600 parts) · Replaced torque tube gears and set the mesh correctly · Replaced torque tube umbrella gear bearings · Replaced pitch slider assembly · Replaced pitch slider control arm and shimmed for zero binding · Ensured the ball links and pushrod operate butter smooth · There is slop in the pitch slider mechanism as a by-product of the design. Though it is minimal (~1mm measured at the tip of the tail blades) · Balance the main blades on a Koll rotor pro · Blades are tracking perfect…checked with a digital pitch gauge on the bench as well · Checked the rotor head for balance on a dubro prop babalncer · Adjusted the main gear mesh for minimal backlash · Installed KDE direct tail boom supports · Changed the gyro tape combinations (current is 3mm – steel plate - 2mm on top) · Disabled gov mode on my CC ICE 100 to see if the issue was gov kick. During the process I saw the skids vibrating hard due to the different headspeed that I selected in Fixed mode…though the headspeed I used (between 2100 and 2275 voltage dependant) was slightly less than my normal headspeeds ( 2200, 2300 and 2400). Vib issue causing gyro problems? · Moved the BEC far away from the RX and Gyro · Bench tested the gyro and tail servo to ensure no ESC/BEC interference. Tail servo is always jittering…Though I noticed when programing the Spartan on the PC that the pulse width was constantly fluctuating minute amounts…I have a super fast tail servo with a tiny dead band, so no doubt the jittering is a result of picking up the fractional changes from the gyro. · Bench test with the rotor head removed and the heli running at the 3 set headspeeds in gov mode (2200,2300,2400) with tail blades still installed. There are high frequency vibrations which I can feel in the frame sides and gyro case. Gyro seems rock solid though, no noticeable pitch change in the tail blades on the bench) All these changes made little difference to the random wag. At 30% gain on my Futaba 7C the wag is random and slow and the tail performance is somewhat sluggish. I noticed an inconsistent piro rate in stall turns. In a hover in the wind the tail seems to have a very slight drift….I noticed this more when hovering inverted, though this is more of a perception thing I guess. Tail servo cool-warm. At 50% gain the tail seems quite responsive with very aggressive stops (a little bounce, gain maybe a little high). Random wag becomes a higher frequency, smaller amplitude and at more frequent time intervals. Tail servo warm. Really the only things left to do are : · The main shaft (current one runs true on the dubro prop balancer) · Main shaft bearings · Motor bearings . .. is it normal for scorpion motors to have vertical play? Or should the shaft be shimmed to remove this? · Using one piece of 2mm gyro tape OR strapping down the Gyro · Tail blade balance check. They are the KBDD extreme tail blades (84.5) and they are exactly the same weight, yet I haven’t checked the balance. · Reducing the mechanical gain by moving the ball on the servo arm in until the total servo travel is 200% (probably end up at 120% and 80%) – using a drilled servo wheel · Different main blades and tail blades I need help that’s for sure….what would be the best test to do first? |
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04-12-2012, 06:00 PM | #2 (permalink) |
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Perhaps the best thing to try at this stage is put the gyro on another heli so you can rule it in/out as the cause of the problem. If you don't have access to another heli you can send the gyro back to us to be tested. There is no charge for the service but you will have to pay the return postage if the gyro isn't faulty. Just open a support ticket as described here: http://www.spartan-rc.com/resources/...q.php?topic=47
Is this a gyro that you had for long time or a new one? Cheers, Angelos |
04-12-2012, 09:11 PM | #3 (permalink) | |
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Thread Starter
Join Date: Apr 2010
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Quote:
If I cant manage to sort the issue out I will try it on my 450 Pro to rule it out as an issue. I checked both the KBDD extreme blades I had installed and the edge 86mm (new blades) I had lying around. Both are perfectly balanced (koll rotor pro) and weigh in exactly the same (to two decimal places in grams). So no issue there. However, I installed the new edge 86mm blades and did something I usually dont do. Tightened the blades down harder than normal. They still move (bit sticky), but offer more resistance and seemingly less slop in the blade grips. I have always made the tail blades only just tight enough so they hold up under there own weight and dont flop around. Maybe this is the issue all along Will fly tonight and see how it goes. |
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