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HelicopterAlignOther › JR 7703D and tail slider issues
11-26-2007 07:53 PM  10 years agoPost 21
n808

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Seattle, WA - USA

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I have had the same problem with my JR 770 3D/8900 combo on a different heli (Knight 3D) without much slop in the tail slider, since the tail servo is mounted on the tail. It is very hard to find a gain setting that holds well, and does not wag in FFF. I am at 63 as well, with Align carbon tail blades. At 62 it does not hold completely, at 63 I sometimes see a slight wag in FFF. I had even more wag/less hold with K&B 85mm tail blades, where I was at gain 65.

Karl.

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11-26-2007 08:49 PM  10 years agoPost 22
motowncali

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Napa, ca

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n808, it sounds like you have actually had the same issues. I don't think it has anything what so ever to do with ATV, D/R, expo, or gyro limits. The slop itself is causing the oscilation. What did you finally do? /sounds like the different blades didn't help much.

I changed out to carbon rods, side and rear. The slop has been cut in half. When I get a chance, I will have my friend fly it again to see if it is right now, if no, I think I will be looking at the 611.

Mo

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11-26-2007 09:04 PM  10 years agoPost 23
n808

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Seattle, WA - USA

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What did you finally do?
I left it where it was at for now, and will try again next weekend. It got better with the carbon blades, but I still could not find a gain that held 100% and did not ever wag during FFF. I have minimal slop in the direct link from servo to tail pitch control arm.

Karl.

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11-27-2007 05:32 AM  10 years agoPost 24
motowncali

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Napa, ca

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n808, are you running a tail boom servo mount? I have thought of this as a possible sollution to slop.

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11-27-2007 05:37 AM  10 years agoPost 25
n808

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Seattle, WA - USA

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Yes, like I mentioned, it's a different heli, a Knight 50 3D.

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11-27-2007 05:45 AM  10 years agoPost 26
motowncali

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Napa, ca

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ahhh ok, forgot about that, but then again, I am not familiar with that heli. please let me know what you find out. I will also post up with my findings after having mine put through the paces.

Mo

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11-28-2007 06:00 PM  10 years agoPost 27
Jay1

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Colorado Springs

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I am having the same issue. I am almost ready to give up.
Done everything you have mentioned too. Still get the bounce.

Jay
Sooner or later, Gravity will win!

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11-28-2007 06:17 PM  10 years agoPost 28
motowncali

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Napa, ca

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Jay1
To get rid of the bounce, you need to turn the gain up a little. Go 1 or 2 up on your gain until it doesn't bounce. If you are using the DX7 or a JR radio with the gyro menu, it needs to be set to 63. That seems to be the magic number. If you read through this thread, you will see what to set the atv to for a switch. Good luck. The problem that I have is an oscillation issue. I got rid of the bounce with gain.

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11-28-2007 06:27 PM  10 years agoPost 29
Jay1

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Colorado Springs

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Sorry but I forgot to mentioned that this is on my 450 V2 as I have a 611 on my 600N. I think the thing is too much for the 450 as I have my horn at 7mm to be able to increase gain but if I get up to 64% I get a bad wag and decrease to no wag at 60% and not enough gain to stop tail bounce back of over 10-30 degrees.

Jay
Sooner or later, Gravity will win!

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11-28-2007 06:36 PM  10 years agoPost 30
motowncali

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Napa, ca

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Jay1, did I see your other post? something about Horizon or JR saying to send the gyro back since it isn't working correctly? I do agree, that there seems to be a very fine line between working and not working. The scary thing at this point is that I am happier with the performance of my 401 on my trex 450 than I am with the 770 on my trex 600N. The interesting thing is that all the help on this points to setting it up just as stated in the manual. I have done that and it just isn't woeking for me. Actually though, If all I were going to ever do is slow flight and hover, it would be fine. What the heck kind of gyro is that.......LOL Something isn't right. Wonder if there is a bad lot of gyros? Even in the RC Heli write up, they had a bad gyro that they had to send back and get a replacement????? Guess I better call Horizon also. Hope they take care of me since mine is a 770T that I bought online.

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11-28-2007 06:45 PM  10 years agoPost 31
Jay1

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Colorado Springs

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Yes, Horizon Hobby mentioned that it should not have that bounce affect and no amount of exp will tame that. I was just trying exhaust all things too see if I am the cause. They told me to send it back and they would replace for a working one but I may just do a RMA request from where I bought it from and exchange for a ds760 if they will take it back. If not I will send in to Horizon.

Jay
Sooner or later, Gravity will win!

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11-29-2007 04:47 PM  10 years agoPost 32
702nitro

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Las Vegas, NV

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The manual specifically states that ATV/EPA Left|Right should both be set at 150%(max it out for any other non jr radios) and that it shouldn't change. To control pirouette rates you would have to use D/R on your rudder. For the bounce issues, that has to deal with expo on rudder. You need to add some expo and flatten the curve a little bit around center.

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11-29-2007 06:06 PM  10 years agoPost 33
motowncali

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Napa, ca

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Set up atv, d/r and expo as per the manual. This didn't work.

Ran the ATV at settings from 100 to 150, the only change was the piro rate.

Ran the expo from 20% to 90%, no real change here, maybe a little more sensitive to stick imput, but not really. Not like changing expo on any other control suface for sure.

Ran the D/R from 30 to 80, once again, the only change was the piro rate.

If I understand correctly, you turn up the ATV and then knock it back down with Expo because this actually gives you more points of resolution. 150 0 -150 compared to 100 0 -100 for the same stick movement. Then you cut them down. I have never seen it graphed and don't know how much differece there is. to me with the expo turned up like this, you would run expo at 50% or 75% respectively and you still end up with the endpoints of the servo at 75% of motion, but then again, I have never measured it so I am not sure of this. Guess I need to plug a servo in and hook it to a degree meter and see what the actual difference in output would be and see why they have you turn everthing up so high only to turn it back down.

Any other good idea would be helpful. At this time, all claims on this gyro are false in my opinion, my futaba 401 holds better and was a lot easier to set up.

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11-29-2007 06:25 PM  10 years agoPost 34
SRH990

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Birmingham, UK

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I had similar problems with bounce and having to run very low gain, 22% which has been cured by fitting the Quick UK tail upgrade with decent thrust races, my gyro gain is now at 38% (using gear channel) and the bounce is gone.

Steve -Trex 700N, Trex 600N, Raptor 550E, 450SE, Mini Titan, Logo 5003D, Beam E4

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11-29-2007 06:35 PM  10 years agoPost 35
Jay1

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Colorado Springs

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The exact conclusion that I came up with. You have to increase gain for it to quit the bounce but if you can not get up the gain before the wagg then it wont work. I have my link on the servo horn at 7mm which is as close as you can get it to be able to increase gain but it is still at 60% before the wagg so it is still not enough to stop the bounce.

This on my 450 V2 by the way. I think this is just too much servo for a little bird.

Jay
Sooner or later, Gravity will win!

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11-29-2007 07:09 PM  10 years agoPost 36
nivlek

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Norfolk England

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I currently use a JR 8455 (full sized) servo on the tail of my TRex 450 SE V1 , with the arm length at 5mm . This servo works much better for me than all the smaller servos that I tried , including the Futaba 9650 .
I now have a JR 820G tail servo to try .
I am using a JR490T gyro .

At the end of the day , it gets dark .

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11-29-2007 07:16 PM  10 years agoPost 37
Jay1

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Colorado Springs

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I was using the JR 3400G. It list it as a servo to use but I am not too sure.

Jay
Sooner or later, Gravity will win!

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11-30-2007 03:57 AM  10 years agoPost 38
culverdan

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American Canyon,CA

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Mo

Stop screwing around with that jr junk and get a 611 hahahaha how many issues have we had with mine hmmm uh none. Zak set it up and its golden dude we never touched it after that. HAHAHA guess will see what your carbon rods did for it wont we. Oh dang wad!!!! oops shouldve gotten the 611.

Dude I hope those rods fix this issues tired of seeing you being held back from that gyro it your spending more time messing with that thing then flying your heli.

Later oh yeah heli flying this weekend

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12-03-2007 05:58 AM  10 years agoPost 39
motowncali

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Napa, ca

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Well, the gyro locked in today as advertised.

Changed both pushrods to carbon rods, and moved the ball in closer to teh center of the servo, 9mm from center. Gain is set 62, ATV's at 150, D/R at 60 and expo set to 70. Locked in tail slides, flips, Fast forward, sideways and backswards flight. Piro rate looks good, the is a little room on the slider for a little more, but it looks plenty fast enough for me.

Have a great day of flying, hope you guys get them locked it too.

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12-05-2007 03:32 AM  10 years agoPost 40
vteknical

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Chicago

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In your opinion what resolved the issue? I suspect moving the ball link in closer to the center of the servo. With that setup you are pretty much mirroring mine and the Heli on RC heli.

Now go fly that thing!

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HelicopterAlignOther › JR 7703D and tail slider issues
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