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07-29-2014, 04:24 PM | #1 (permalink) |
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ar7200bx help noob
im new to this forum cat. but im seeking for some expert help or any suggestions
thanks ok so i have a blade 300 cfx w/ar7200bx and a dx6i. my gyro gain is 69.5% dial 1: is about 30% dial 2: is about 50% dial 3: is about 45% i really need help, had over 100 flights and still can't figure it out with my nooby mind on this. -when i fly my blade 300 cfx and lets say i do a backflip and as soon as i need to hit negative, the helicopter shakes! i don't know why. people told me to adjust dial 1 and i tried no use... i bought new blade grips, AR slot and dampeners but i still get it. - when i do pitch pumps my tail likes to drop down a little and move to the right then move back up and go left, to its original spot. this all happens really fast when i do pitch pumps, the heli tail like shakes and does what i just explained. i really want it to be like a goblin 500 tail being super solid and no jitters. -someone told me (don't know if he wants me to say his user) told me that i can adjust my FBL unit to be close or just as good to be a goblin 500 tail, rock solid and stuff but it will take some tuning would anyone be up for it to help me? -my other question is that when i do flips and almost make it fully upside down, the helicopter always flys to the left i don't know why i never give input, and my swashplate is pretty leveled. -when i do a piro the tail jitters, and i tuned down the dial 3 but it goes to the point where it just slides away from me and it still jitters :/ i don't understand. thanks for sticking around if you read all of it! and i really need help if someone can explain. to help me and make it easier just do this - ( input your answer for the 1st question of mine) -( and so on with these hyphons |
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07-29-2014, 04:29 PM | #2 (permalink) |
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For the leftward drift in a flip:
Common problem / misconception! Helicopters are not symmetrical systems. The tail rotor blows air to the right (when tail-in on an CW rotor). If in a perfectly flat hover, the tail rotor will blow air right, pushing the heli left. The heli will lean slightly right in hover to compensate. Slam elevator to flip from a hover and tail rotor thrust increases, blowing the heli further to the left unless it is rolled slightly to compensate by the pilot. I'll leave the rest of your questions to other posters. |
07-29-2014, 04:41 PM | #3 (permalink) | |
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07-29-2014, 04:43 PM | #4 (permalink) |
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Yes, normal.
Many simulators (Phoenix, neXt) don't model this effect either. |
07-29-2014, 06:41 PM | #5 (permalink) |
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[QUOTE=mirroredeyes;5987992]im new to this forum cat. but im seeking for some expert help or any suggestions
thanks ok so i have a blade 300 cfx w/ar7200bx and a dx6i. my gyro gain is 69.5% dial 1: is about 30% dial 2: is about 50% dial 3: is about 45% -when i do a piro the tail jitters, and i tuned down the dial 3 but it goes to the point where it just slides away from me and it still jitters :/ i don't understand. Sorry I don't have suggestions for all the issues! But your gyro gain in your TX seems really high to me, that can cause tail jitters when you piro for sure! I had the same problem dialing in my Atom 500 tail with my Beastx as well I had to keep going down till the twitching stopped. Very frustrating for sure! Thats what I would try with your tail gain and see if that helps the tail jitter. Mine is around 50% . Just my thought Best of luck. Also In this forum under the sticky threads is this (BeastX V3 Tuning Guide Updated) I know you have an AR7200BX but there is some really great info on tail setup. Might be worth a read ! I would have posted the link but Im not sure how to do that !
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07-29-2014, 07:04 PM | #6 (permalink) |
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ar7200bx help noob
Keep in mind that some transmitters have a gyro channel from 0 to 100 and some are -100 to +100.
A gain on 50 would be basically zero gain on a 0-100 transmitter.
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07-29-2014, 07:17 PM | #7 (permalink) | |
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I would still give it a shot and go down a few points and see if there is any improvement. If not go back up and that's one more thing to mark off .
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07-29-2014, 08:26 PM | #8 (permalink) |
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When I adjust my gain lower by .5% increments my tail does a slow wag :/
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07-29-2014, 08:42 PM | #9 (permalink) | |
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And if your tail has a bent shaft or the slider is sticky the BX and servo have to work harder to compensate for tail direction. Which would over correct causing bad tail jitters! I just went through that same thing with my 500. I couldn't get mine to stop so I checked the tail nothing was bent but the tail shaft and slider were full of sticky build up of some kind. I cleaned it with alcohol and was buttery smooth again and my tail jitter went away.
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07-29-2014, 09:39 PM | #10 (permalink) | |
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oh gawd... do i have to take my helicopter apart to clean the belt thing? btw how do i tighten and loosen the belt |
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07-29-2014, 10:10 PM | #11 (permalink) |
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Mechanical Setup
On the MicroBeast/BeastX units (the real difference is that the AR7200BX has a built-in Rx) tail wag quite often begins in the mechanics of things. First, check your servo link adjustment to hold the tail straight in Rate mode. This helps the HH mode work less at holding it straight under all conditions (i.e. in hover, FFF and hard 3D) which helps reduce the wags. Of particular note is the slow wag after reducing the gain.
Also make sure there is no slop in the tail assembly including no lateral movement of the tail shaft within the bearings. And as has already been noted, check the belt for proper tension - not too tight, not too loose, just right. To tighten/loosen the belt, you loosen the tail boom mount screws and slide the tail boom in to loosen the belt or out to tighten it. Highspeed |
07-30-2014, 12:11 AM | #12 (permalink) | |
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I'm really booby with these terms but how do I get in rate mode? I got a dx6i |
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07-30-2014, 01:12 AM | #13 (permalink) |
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Here is a guide:
https://www.helifreak.com/showthread.php?t=636644 I have always doubted the need for this, but AR7200BX users swear by it. |
07-30-2014, 12:14 PM | #14 (permalink) | |
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Adjusting the belt as has been said not to loose and not to tight and adjust by loosening the screws for the boom support. For me the easiest way to check if it is to loose is to hold the tail grips so they wont spin and with one hand and put a lite Clock Wise pressure on the rotor head with your other hand. What your checking for is if the belt skips a tooth or two. If it skips you want to just slightly tighten it by loosening the boom support screws and gently pull back on the tail boom which will take the slack out of the belt, and just the opposite if it is to tight you will push the boom in gently! Yes it can be a pain learning how to take things apart and put them back together but it is necessary in this hobby. Just take your time and pay attention how things come apart and go back together.
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07-30-2014, 12:16 PM | #15 (permalink) | |
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As Code3Medic posted the link has some great info for the AR7200bx. Definitely worth a read.
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07-30-2014, 01:14 PM | #16 (permalink) | |
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07-30-2014, 02:48 PM | #17 (permalink) | |
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Rate Mode - An older gyro technology that essentially assists the pilot in holding the tail straight. However, it does not take into account variables such as wind, off-angle flying, etc. It senses a drift in angle of the tail and tries to compensate for it in an attempt to keep the helicopter straight but if the external influence continues the gyro will not be able to keep up and it'll continue to drift. It measures the rate (hence the name) at which the drift is occuring and applies an equal but opposite control input for the measued amount of time. This usually does not keep it or bring it back to the original orientation. HH - Heading Hold (also known as Head Lock) utilizes a more precise gyro setup as well as software algorithms that "remember" the exact heading of the helicopter. Then when an external (non-pilot controlled) force such as wind influences this heading, the gyro system will apply the necessary force for as long as necessary to maintain the desired heading of the aircraft. So HH is much more precise than Rate mode, but Rate mode setup should be performed to help the HH mode do its' job more efficiently and effectively. If Rate mode setup is not done correctly, you will most likely see side effects such as tail wag/wobble in HH mode. Hope this makes sense and helps you understand these terms we throw about here like old pros. Highspeed |
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07-30-2014, 03:45 PM | #18 (permalink) | |
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08-04-2014, 06:39 PM | #19 (permalink) |
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bumped, just need some help the shaking when i do hard pitch
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08-05-2014, 07:43 AM | #20 (permalink) |
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To stop shaking, often necessary for smaller birds, turn down pot#1 cyclic gain from 9oclock default to 8:00 and see if that stops the shake. If that works, try back up to 8:30, etc, to make it as high as you can with no shake.
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