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300X Blade 300X Helicopters Information and Help |
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07-01-2014, 08:06 AM | #141 (permalink) | |
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It looks to me as it's coming from the belt moving up and down on the center gear (I use the Lynx alu with one-way). I'll see if I can stop this behavior by making a new roller, maybe with a guide... Then again my vibrations may not be from this... might be tail grip/rotor imbalance... Anyone converted a 300X or 450X to torque tube btw???
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Micro: OMP Hobby M1 Medium: Blade 330X 6S, SAB Goblin 380 Big: SAB Goblin 500 Radio: Spektrum DX8 Gen 1 |
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07-01-2014, 08:13 AM | #142 (permalink) |
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Join Date: Jul 2012
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My belts wander around a little bit. They don't do it too much but it's enough to notice. When you think about it, the belt is twisted 90 degrees in the tail boom in order to go from the horizontal gear to the vertical gear, so I guess you could say a little wandering is expected. I never really paid much attention to it to care, since I do my tail vibe checks at full load without the main blades on. I tried grabbing some video but I couldn't get the camera to focus on it.
Regardless, if you feel it's wandering around too much, trying another belt certainly couldn't hurt anything.
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07-01-2014, 08:15 AM | #143 (permalink) | |
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AND I have some SERIOUS tail way to rid...
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Micro: OMP Hobby M1 Medium: Blade 330X 6S, SAB Goblin 380 Big: SAB Goblin 500 Radio: Spektrum DX8 Gen 1 |
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07-01-2014, 08:18 AM | #144 (permalink) |
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Join Date: Aug 2007
Location: Georgia
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Don't know if i have tail wag or not, not been able to fly mine yet cause of a bad motor causing vibration on entire heli.
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07-15-2014, 08:32 PM | #145 (permalink) |
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Join Date: Sep 2012
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no more vibes
Guys, I have been doing a lot of reading on this 300x vibes and I have fixed my vibes and no more roll of death.I have the lynx ultra dfc head and ultra tail system with the extended boom and 275 mm mains and the cf stiffner. I was getting bad vibes even after balancing both main and tail blades and with all the new upgrades.I have figured out that most of the issues have to do with the plastic frame, so instead of buying new bearings and other upgrades I decided to do the hot glue that was talked about at the beginning of this thread but took it a little further.I hot glued the inside of the frame all around even under and around the landing gear and I also used some of that lynx omicron pieces on the cf frame stiffner where it touches the plastic frame or very close to touching because I think that was also causing vibes.Once I did all that I lowered my throttle to no more than 78 % and my I also use double of that lynx omicron on my beastx and I have no more vibes at all! My carbon tail does not vibrate a bit, not even on spool up and no more death rolls.I did not mess with the settings on the beastx just made sure my blades were balanced and the hot glue and it solved my problems.I don't know how to upload a picture otherwise I would for everyone to see.I hope this helps some or all of you.I will be getting the Lynx cf frame next so I won't have to worry about any vibes period.
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02-16-2015, 05:07 PM | #146 (permalink) |
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Join Date: Jan 2014
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My heli hovers fine with no apparent vibrations. Even so, I wanted to see if I could improve the tail hub/blade balance. There is a minor short slow wag trying to fix. So I removed the main blades and ran the motor looking close at the tail hub for any sign of vibration while holding the heli steady on the bench. The tail spins very smooth at all speeds, can not see any vibrations. I would have tried a small amount of tape to balance......but not seeing any problem.
BUT.....when moving the tail from side to side, as the tail blade pitch increases near the limit with tail moving right (nose to left) there begins to be a harsh vibration as the pitch slider gets to within about 1/8th inch or so from the limit of travel. Then when moving the tail in the opposite direction...tail left (nose right) same thing except the vibration is much less but still some. When I'm hovering and use the rudder I never experience this harshness or vibration. Does this sound normal? Maybe running with the main blades removed allows faster rotation speeds or some unusual dynamic? |
02-16-2015, 05:34 PM | #147 (permalink) |
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Join Date: Feb 2013
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Every time I've had tail wagging issues it's invariably boiled down to a problematic tail servo.
The question I would ask is if the vibration is being caused by something mechanical or is it the servo struggling to fight against the torque of you moving the tail by hand. I guess I haven't done that (spool up with just the tail blades attached) with a BeastX equipped heli in a while so I'm not sure how normal that is. I'd say if the mechanics move smoothly without any binding by hand it's probably not a big deal.
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Gaui X5F 6S (VBar), Lynx 450X-L 6S (Ikon), Lynx 300X-L 4S (Ikon), Blade 180CFX 3S (Ikon) Lumenier QAV400 4S (Vector), Lumenier QAV250 3S (Naze32/CleanFlight), CYE Stingray 500 4S (TG Multi) AMA Member, HCAM Member |
02-16-2015, 06:08 PM | #148 (permalink) | |
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Join Date: Jan 2014
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Quote:
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02-25-2015, 08:54 PM | #149 (permalink) |
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Join Date: Feb 2013
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I was seriously hoping I wouldn't be here again but here I am! Just spent 4 hours trying to troubleshoot this dang wicked tail vibe. Without tail blades, she runs as smooth as a 300 can run. With tail blades (and I've tried 3 different sets, two cf and one plastic) from about 25-30% throttle, you can see the vertical fin going crazy and it gets worse up the throttle curve as it actually bogs down the motor. Motor mesh is also spot on.. I've always been able to fix with electrical tape on one blade through trial/error but after 4 hours I'm calling it a night. Everything is straight from tail shaft to hub to the main shaft......belt is just the right tension and I even tried loosening it all the way till it skipped with a little force......no differnce. Thank God for the 450 otherwise I'd really be hating it. Also have the Lynx frame brace and she's as rigid as heck. Can't work tomorrow due to 8-12 inches of snow forcasted so hopefully with a fresh start and a whole day to look over it.....this gets really frustrating to the point I can only laugh about it to keep from throwing it against a brick wall
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02-25-2015, 09:42 PM | #150 (permalink) |
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Join Date: Jan 2014
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Bobby, I had really bad tail vibes a year ago with my original 300x. Ended up getting a Tarot 450 alloy tail hub which helped greatly. But I also had to replace the tail shaft and both bearings with a new stock shaft and some other brand of bearings. I may have replaced the pitch slider as well. Mine has been great ever since that major overhaul.
Maybe take a close look and see if the gaps between the grip and hub is exactly the same on both. Sometimes a thin shim between one grip and the hub can help. Just an idea......best of luck buddy! |
02-25-2015, 09:53 PM | #151 (permalink) | |
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Join Date: Feb 2013
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Quote:
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02-27-2015, 12:04 PM | #152 (permalink) |
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Join Date: Feb 2013
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So after another 2 hours messing with the tail (yesterday turned out to be impossible as per working on it) I finally got it so that I have a slight resonance at about 20-30% throttle, then it smoothes out and at 85%, which is my flat TC in idle up, she's smoothe and the BX is stable with no movement. Now to take her and the 450 to the field and see what she does. What a PITA! I got it to this stage just by the smallest amount of elec. tape on one tail blade up near the grip....wish there was a "fingers crossed" icon. This is the closest.....
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02-27-2015, 01:43 PM | #153 (permalink) | |
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Quote:
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mCPx'es/130X/3D-foamie: ugly mods 300X: fast beater/trainer, Protos stretched: trainer but can also go fast FPV250 5.8G, nQx FPV, Oh also Trex 450DFC |
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02-27-2015, 04:49 PM | #154 (permalink) |
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Join Date: Feb 2013
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So what I noticed today before taking her to the field was that I wasn't pulling the grip that I thought had no slop in it hard enough. Both grips have identical slop, which I'm not crazy about. I had one identical bolt washer that I added to one side, just to see how much it would improve the slop.....I would still need one more washer to completely get rid of it, and having only one and needing 2 for each grip, I just figured if they each have identical slop all would be ok. That, and I desperately wanted to get her in the air. However, when I got to the field and spooled it up and saw the vibration (same amount I had at home just around 20-30% throttle, but now we're talking putting her in the air!!) I got a sudden case of the chicken sh*ts and decided to just fly the 450. It takes every ounce of skill I can muster just to switch back to normal mode during a roll right episode... The order of what's inside the grips from the hub out is bearing, brass spacer, bearing, wide outside race washer, thrust bearing set, small bolt washer, bolt. And I double checked when I got home that all of the thrust bearing caps were correct which they were. Am I missing something? I never had that amount of slop before I'm pretty sure. Is that aluminum tape you mention heating and air duct tape? I have a roll of that. But with the amount of slop I have I'd probably be better off just ordering 4 washers. Or save the aggravation and just order the lynx, Align or Tarot hub.
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02-27-2015, 04:53 PM | #155 (permalink) |
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Join Date: Feb 2013
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Now that I think about it, is it the small bolt washer or the larger inner race washer you need to add thickness to?
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02-27-2015, 05:16 PM | #156 (permalink) |
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Join Date: Feb 2013
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I noticed on Lynx webpage with the 300x hub/grip assembly, Luca says they determined a good deal of the vibrations come from the thrust bearings, which they have completely eliminated on theirs...
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02-28-2015, 11:34 AM | #157 (permalink) |
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Join Date: Feb 2013
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Got the tail vibes to a minimum, just at 40% throttle without the mains on. At the field spooling up with the mains, which are perfectly balanced and tracked, I had so much vibration it was unbelievable. Running a Lynx main shaft/owb assembly. Guess I'll be doing a complete tear down and rebuild and see if anything is obvious. I had loosened the tail case as per suggestions so I don't know what else to do but tear it down including the head assembly. If I can't find anything and it still vibrates afterwards, I'm gonna order the lynx tail hub assembly and go from there. This sucks. At least the 450 is flying great so I'll just be grateful for that. I'll let you guys know the minute I find the problem.
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02-28-2015, 06:28 PM | #158 (permalink) |
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Join Date: Feb 2013
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As soon as I disassembled the Lynx frame brace I found the frame was split almost in two . Well, I am half Polish Impossible to see with the brace attached and the frame seemed rigid when twisting so I completely overlooked it. Totally split behind the front servo and cracked halfway on the other side. Now it makes perfect sense as to the amount of vibration I was getting as soon as the mains were attached and spinning. Thanks to all for the support and thanks Shy for this thread. Instant stress relief!!!!
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03-01-2015, 09:03 AM | #159 (permalink) |
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Join Date: Apr 2013
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Great that you found it, what a relief. I use the stock plastic frame because I' m obsessed with keeping the weight down and I don't crash much anymore, but every crash I've ever had has broken the frame somewhere. The rebuild will give you something to do while the snow melts.
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03-08-2015, 03:10 PM | #160 (permalink) |
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Join Date: Feb 2013
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So I got the main frame and rebuilt everything and lo and behold.......same wicked tail vibrations. So I break the complete tail down again and this time I noticed the spacers between the two bearings in each grip were different. One was a beveled spacer while the other one was flat. It not only made the grip not sit as tight to the hub but also possibly have a different weight......I'm curious so I'll weigh them both later and see. I had some old grip parts and found another beveled spacer and slapped it together and now I'm flying without any tape on the tail blades. The only thing I can think of is that they were from different grip lots and at one time they used the square bevel??? I have just replaced one grip in the past........
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