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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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02-26-2010, 05:08 PM | #21 (permalink) |
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Reset your deadband to 0, it is default at 2us see if that helps
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Carl Trex 550E FS Vbar Pro 5.2- EXI-450T Mini Vbar Pro 5.2 - EXI 450T BeastX - Trex 250SE - mCPx v1 Hp05 & HP06 w/HP03t tails - AMA #952544 |
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02-26-2010, 05:15 PM | #22 (permalink) |
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Join Date: Dec 2009
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Question how would set deadband to 0 on a quark with out programer adapter ?
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02-27-2010, 10:38 AM | #23 (permalink) |
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the dead-band is on the servo, you need to program the digital servo to use a 0 dead band, maRRRco said he was using a DS11 and that servo defaults to 2us for a dead band. I would check your tail servo and see what it's DB is, the 3500G's are 0 I think this is why most people are having great success with them.
from what I understand the DB is what the servo will tolerate in movement of the horn prior to correcting the horn position, couple the DB with the tail slop and you can get some bad drifting. I have the 420 servo on my tail (came with the super combo) and I cannot find out what the DB is for this servo thus it might have inherent drift. I believe we need to consider the entire tail system when trying to fix issues and the DB is something I believe is being overlooked to some degree. Adding a weight mod will reduce the perceived drift since less torque is being applied to the servo thus the less horn movement is experienced. So if we add these tail mods in and overlook the servo drift and gyro we can still have issues, do not get me wrong, the gyro may be fine but the servo will still allow tail drift and the gyro may miss it since it is so subtle. Some digital servos allow programming and others do not, some may require a programmer to adjust them, so be aware. most servo's I think are like 5us some cheaper ones can be more. Just my thoughts on this subject
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Carl Trex 550E FS Vbar Pro 5.2- EXI-450T Mini Vbar Pro 5.2 - EXI 450T BeastX - Trex 250SE - mCPx v1 Hp05 & HP06 w/HP03t tails - AMA #952544 |
02-27-2010, 01:24 PM | #24 (permalink) | |
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Quote:
why?? mmm for the reason when i switch rate to avcs the pitch slider moves a little?? |
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03-01-2010, 08:36 AM | #25 (permalink) |
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maRRRco,
that is how it is set form the factory, you would need to ask them. The 2usec dead band refers to the amount of movement the servo will tolerate before it corrects itself (digital servo's will do this), digital servo's have a memory of sorts and remembers where it is supposed to be between updates from the receiver. The larger the dead band number the more drift the servo has before correction. If you look at all the good servo's you will see a 0 for a dead band number. the 290G is 0, yours can be too but needs to be reprogrammed. You will need to check the docs on the servo on how to reprogram it, some require a programmer. maybe your LHS has one and they can do this for you. As to your second question, no that is due to the gyro.
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Carl Trex 550E FS Vbar Pro 5.2- EXI-450T Mini Vbar Pro 5.2 - EXI 450T BeastX - Trex 250SE - mCPx v1 Hp05 & HP06 w/HP03t tails - AMA #952544 |
03-02-2010, 07:07 AM | #26 (permalink) | |
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Quote:
i try to programm my servo, i need only a usb cable, it is cheaper byee |
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03-02-2010, 08:51 AM | #27 (permalink) |
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maRRRco,
Let us know how it works out, always like to hear the results it also helps others
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Carl Trex 550E FS Vbar Pro 5.2- EXI-450T Mini Vbar Pro 5.2 - EXI 450T BeastX - Trex 250SE - mCPx v1 Hp05 & HP06 w/HP03t tails - AMA #952544 |
03-02-2010, 09:32 AM | #28 (permalink) |
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Join Date: Jun 2006
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I replaced the Spartan with the new Inertia Nano gyro and it is rock solid. I bought the 250SE from a friend of mine so I am not sure if there was ever any problems in the first place, but I have none while flying it! I never think about the tail. Its always where it needs to be.
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03-05-2010, 03:40 PM | #29 (permalink) |
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Join Date: Feb 2010
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i controlled evry parts of my hely, all was absolutely perfect
i smount and remount tail many times, it is great i also add a wd40 spray to tail to give an absolutely free movement i changed servo with hyperion 09gmd i add metal pitch slider L control i also buy gel align and at the end, my shop change me the quark with a new if doesn't hold now .... |
03-30-2010, 03:55 PM | #30 (permalink) |
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Join Date: Feb 2010
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hi all, my drift continue
the tail moves of 40° in about 5 minutes of continuos hover, without touch rudder stick i change servo to hyperion 09 gmd 0.05 sec, is too fast?? i try gel align, the tail hold well, but in hover same problem gain 63% witk spektrum trottle 0.70.80 etc and first of all, i change my quark with another one, same problem if there are any vibration, where i can search theme?? and finally, is normal that without touch the rudder stick, tail moves after 5 minutes of x°, without is perceptible, and not only in 250, but in every hely |
03-31-2010, 10:48 AM | #31 (permalink) |
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Join Date: Feb 2010
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if can be help
the drift is more fast if i mount 40mm tail blade, and it is visible with 42 is very very slow, 40° after 5 minutes of continue hover without touch rudder stick |
03-31-2010, 01:05 PM | #32 (permalink) |
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Join Date: Feb 2010
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Then, I add a particular
align tail pipes have a mounting hole of the housing queue is not accurate, then the tail is not always perfectly vertical I noticed that tail blades had an inclination to the vertical of about 3-4 ° This may cause the drift? for a simple play of forces, both horizontal and not maximum, given by its angle and its cosine Indeed with the tail blades smaller drift increases rapidly, this could corroborate my thesis, do not you think? |
03-31-2010, 01:24 PM | #33 (permalink) | |
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MaRRRco
What you have to do is, while the tail mount screws are still loose, just rotate the assembly until the t/r disc is parallel to the main rotor shaft (or perpendicular to the main gear.) However, while you do want this to be the case, I can almost assure you that is NOT the reason you are getting that drift. I had a similar issue at one time and come to find out, it was caused by a soon-to-fail t/r belt. Check and make sure your belt is OK. Make sure, first, it's not overly worn and secondly make sure that it's tight enough and not slipping. Easiest way to really determine this is to grasp the main gear, then GENTLY turn the t/r in both directions. You should not get any slippage. If you do, tighten it up and/or check your belt. Quote:
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Joe T-Rex 250 SE w/Walkera 2801 radio. alloy boom block, CF boom, alloy servo mounts, CF pushrod, alloy t/r bell crank, JR DS290G, Kevlar t/r belt, 40mm KBDD t/r blades, Titanium turnbuckles. |
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03-31-2010, 01:53 PM | #34 (permalink) |
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Join Date: Feb 2010
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thanks very much
i will try, and i probably upgrade to a kevlar belt, actually in some parts is slightly frayed, or rather I see tiny lint even if the hely is new, few fligth, no 3d but why with 40mm stock tail blades drift is visible and more fast ?? with 42 are invisible, only at start and end i see tail different position |
03-31-2010, 03:21 PM | #35 (permalink) |
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more drag on the drive system perhaps.
Is there any slop in the tail? I know you changed allot of parts but you can see more than us.
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Carl Trex 550E FS Vbar Pro 5.2- EXI-450T Mini Vbar Pro 5.2 - EXI 450T BeastX - Trex 250SE - mCPx v1 Hp05 & HP06 w/HP03t tails - AMA #952544 |
03-31-2010, 03:41 PM | #36 (permalink) |
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Join Date: May 2009
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Have you tried re-binding?
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03-31-2010, 05:28 PM | #37 (permalink) |
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Do you have any drift in rate mode?
Sorry if this was asked already |
04-01-2010, 03:56 AM | #38 (permalink) |
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Join Date: Feb 2010
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the slop in my tail is normal for 250
all rex 250 have the same slop, in grips and slider i change for try slider and upgrade witk metal L but i don't know why with small tail blades (40mm) the drift is too fast what is more drag on drive system?? drift in rate mode is normal for 250 heli, it's impossible to set the link good, to have no drift i will try to rebind |
04-01-2010, 08:33 PM | #39 (permalink) |
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Join Date: May 2008
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Here is write-up from Angelos (Spartan) regarding drift....
http://www.spartan-rc.com/resources/...=20&category=9
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