Topic Subscribe
WATCH  1 page1547 viewsPOST REPLY
Mikado . Futaba-RC . HeliProz
. .

e-
Align T-REX 100 150 250 450 500 550 600 700 800
 >

Trex 250 tail wag please help!

OH-6 Cayuse

Veteran

san antonio tx, USA.

Hi everyone,

Ok so today I was flying my 250 just fine in the afternoon after a few flights it started wagging at first not so bad so I tried messing with the gain. That didn't solve anything and soon after the wag became pretty violent had to land it. Not sure if my throttle curve is bad so it's actually tail bob but my settings are 0,inh,78,inh,100 are those ok settings on the throttle? It has a gy520 with a ds3500g. Any help would be highly appreciated I also noticed some hairs coming undone from the tail belt so I'm not sure if thats contributing to the problem.

Thanks,

Eric.

!!For some people the sky is the limit, for me it's home!!

03-11-2011 Over year old.
James Allen

Veteran

South West, OH USA

Not saying this will take care of the problem, but if your seeing hairs from the belt separating, I would replace the belt. It could be slipping. Also check the tail for slop. My 250 always had a little tail wag, but got worse over time. I noticed a lot of slop in the tail assembly. Later I crashed it. It's still sittin on the shelf with a bent tail boom and bent main shaft. I enjoy larger helis much more.

TT Raptor E700, TT Raptor 50v2, Rave Ballistic 700, Rave ENV nitro, Rave 450 citizen #210

03-11-2011 Over year old.
OH-6 Cayuse

Veteran

san antonio tx, USA.

Yes theirs little bunddles of hairs separating from the belt I just got the heli and trying to fix out the bugs. I like flying this little ones because they keep you on your toes. Another thing is that there is a lot of play on the tail for my liking but that was there before the wagging.

!!For some people the sky is the limit, for me it's home!!

03-11-2011 Over year old.
James Allen

Veteran

South West, OH USA

I was told by a couple people to try the (micro heli) brand tail assembly, because it was much better quality than the stock assembly. I crashed it before I had a chance to pic one up though. Good luck with it.

TT Raptor E700, TT Raptor 50v2, Rave Ballistic 700, Rave ENV nitro, Rave 450 citizen #210

03-11-2011 Over year old.
jschenck

rrProfessor

La Vista, NE.

Seems that the tail wag is a problem for some 250 and not others. In our club we have some that have solid hold on the tail and some that wag. Things that I do to try and help:

1. Replace the pushrod wire with a CF tube. The stock wire flexes causing a wag. Same with the 450. I make my own CF pushrods.

2. Run a big tail servo. I've seen smaller (9g size) servos work but seems that the 18g size hold better. I have a Futaba 9257 on my 250, works good for me. gyro is the Logictech 2100 on mine. Others are using the Align 750 and Futaba 520 with good results.

3. Ball link at 4.5mm on the servo horn. Make sure the ball links are not too tight.

4. tail grip bearings. I'd really look here for this situation where it was ok and got worse. If the tail grip bearings are going out that'd cause a lot of problems.

5. make sure the belt drive pulleys are not slipping. I ran into this on a 450, haven't seen it on a 250 but worth mentioning.

6. Make sure the gyro mount is good. If the gyro is getting loose that'd cause all kinds of problems. Also check all the electrical connections.

7. Did any vibrations show up? Something to think about.
I like flying this little ones because they keep you on your toes.
me too
I was told by a couple people to try the (micro heli) brand tail assembly, because it was much better quality than the stock assembly
not sure about that. I haven't run one but another 250 in our club was fitted with one and I seem to remember he wasn't impressed. I don't think it helped with the tail wag. He's having a real <fillintheblank> time sorting out the tail.

Team GrandRC

03-11-2011 Over year old.
James Allen

Veteran

South West, OH USA

I was told by a couple people to try the (micro heli) brand tail assembly, because it was much better quality than the stock assembly
not sure about that. I haven't run one but another 250 in our club was fitted with one and I seem to remember he wasn't impressed. I don't think it helped with the tail wag. He's having a real <fillintheblank> time sorting out the tail.
I don't really know on the micro heli tail. Thats just what was recommended to me, so I can't give an honest answer on it. Crashed it before trying one out.

I would replace the belt and get rid of any slop in the tail first. IMO. If that doesn't do it go further into inspection of other items like jschenck recommends.

TT Raptor E700, TT Raptor 50v2, Rave Ballistic 700, Rave ENV nitro, Rave 450 citizen #210

03-11-2011 Over year old.
OH-6 Cayuse

Veteran

san antonio tx, USA.

Yes there's some vibe on the head it's less than when I got it but it still has vibrations on the head. I will look into step 1-6 but I really think it's the blade grip bearings it has a lot of play!

!!For some people the sky is the limit, for me it's home!!

03-11-2011 Over year old.
jschenck

rrProfessor

La Vista, NE.

I will say that I've never seen a 250 that doesn't have an excessive amount of play. Mine is really sloppy. Funny thing is the 250's with loose/sloppy tails seem to hold better than tight tails (to a point). There are some areas that are just about impossible to take the slop out of. Tail grip bearings are a tough one. These little tiny parts create a lot of relative slop where the same clearance gaps on bigger machines wouldn't have nearly the same amount of overall slop.

Anyway one way to can see of tail grips are a problem is to get a set of 37mm Align tail blades and try them If the wag goes down then one possible explanation is the lighter tail blades are putting less "pull" on the tail blades at speed therefore the tail blade grip bearings are not sticking as much. Of course the smaller tail blades also produce less tail blade authority which reduces the gain a bit so it's all parts of the puzzle and finding the right cause and solution may not be that simple since one change can affect 3 different "things".

Find the vibrations. Could be a bent mainshaft.

Check the main blade balance and tail blade balance.

Don't run the tail blades too tight.

Last time I had a vibration it was the main head hub was bent. also could be a bent tail output shaft. Really hard to bend a 250 spindle since they almost always break but worth checking.

If the blade tracking is slightly out the 250 hates that, same with the paddles.

I red-loctite the main blade grip ball links in place. I've had them come loose too many times, they don't do that anymore. I never want to remove them anyway.

I haven't seen it but certainly could be possible to have a bent motor shaft. I have bent the motor plate several times so a good crash could bend the motor shaft.

Team GrandRC

03-11-2011 Over year old.
OH-6 Cayuse

Veteran

san antonio tx, USA.

Thanks jschenk I'll be sure to check everything you mentioned, I really appreciate the help! Hope I can find parts in town tomorrow...

!!For some people the sky is the limit, for me it's home!!

03-11-2011 Over year old.
Moparmyway

Heliman

NY, NY

I have the MicroHeli tail assy on mine. Tail wag went away instantly and there is no slop at all in it.

http://rc.runryder.com/helicopter/r..._Nov_08_003.jpg
http://rc.runryder.com/helicopter/r..._Nov_08_010.jpg

03-21-2011 Over year old.
OH-6 Cayuse

Veteran

san antonio tx, USA.

That's really great looking I changed the tail bearings and also the head bearings most of the wag and vibrations are gone, from time to time it comes back though maybe its just the weather is been so darn windy but still it shouldnt do that if it starts to wag again I'll check that tail out. Where did you get yours from??

!!For some people the sky is the limit, for me it's home!!

03-22-2011 Over year old.
Safe_Cracker

Key Veteran

Chicago, IL

I put the MH tail assembly and it stopped... ONly thing is that you really need to loc tite them little screws down or you will lose them one at a time lol.

Polo

03-22-2011 Over year old.
OH-6 Cayuse

Veteran

san antonio tx, USA.

No kidding about the lil screws lol where's a good place to get one? I'm getting more interested as we speak lol

!!For some people the sky is the limit, for me it's home!!

03-22-2011 Over year old.
Heli-on

Veteran

Southern Cali, CA - USA

The Micro Heli hub and tail grip arms is the only thing I'd recommend - not the complete tail ass'y. The side cases are way too soft. Their metal bearing holder that holds the metal ball might be okay, but I wouldn't use the dual control arm it comes with. I'm also not a fan of their oddball hardware they choose to use on their parts.

You can actually get the Align parts to work if you use Gaui bearings. The SE grip arms have the centripital weights built in. They're definitely 'floppy', but that's seems to be the norm.

I use green (290) loctite on every screw on the 250.

The kevlar belts from Infinity are the best 250 belts you can get.

Everything in the head needs to be perfectly balanced or you're going to get vibes.

03-22-2011 Over year old.
Moparmyway

Heliman

NY, NY

OH-6 Cayuse,
I got the whole assy from my LHS, they carry Micro Heli stuff. I must have about 400 flights on my MH tail, not 1 single problem but I do keep up on the lubrication of all of my Helis and motors

03-22-2011 Over year old.
WATCH  1 page1547 viewsPOST REPLY
Boca Bearings . ExperienceRC . JR AMERICAS
. .

e-
Align T-REX 100 150 250 450 500 550 600 700 800
 >

Trex 250 tail wag please help!

 Print TOPIC Advertisers 

Topic Subscribe

Friday, August 22 - 2:57 am - Copyright © 2000-2014 RunRyder   EMAILEnable Cookies