RunRyder RC
WATCH
 1 page 1344 views POST REPLY
Home✈️Aircraft🚁Helicoptere-AlignT-REX 250 › ROTATION
07-25-2013 06:18 PM  6 years ago
Topic Vote0Post 1
barrancomd

rrNovice

Memphis

MyPosts All Forum Topic
ROTATION
I have a Trex 250 BTF will finally when got it all together and ready to fly had a hard landing. Spin main blades and tail moves but when spool the tail rotor does not keep with the main rotor. Check both front gear and rear gear and appear to be intact. Could some one guide me on this one
Thanks
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
07-25-2013 06:26 PM  6 years ago
knightofcarnage

rrElite Veteran

chicago

MyPosts All Forum Topic
Check your meshing between motor pinion and main gear. Next your pinion might have unglued it self.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
07-25-2013 07:52 PM  6 years ago
knightofcarnage

rrElite Veteran

chicago

MyPosts All Forum Topic
Actual its cheaper for you to replace the entire main gear assembly.
http://shop.align.com.tw/product_in...roducts_id=2732
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
07-26-2013 01:56 AM  6 years ago
jschenck

rrProfessor

La Vista, NE.

MyPosts All Forum Topic
hold the tail blade grips with your fingers and try to spin the main blades. If you can spin the main blades then something is slipping in the drive line to the tail blades. track it down and fix the slip.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
07-26-2013 03:05 AM  6 years ago
dkshema

rrMaster

Cedar Rapids, IA

MyPosts All Forum Topic
This heli should have a torque-tube tail drive. If, as you say, the front and rear gears for the tail are intact and functional, and the tail is not being driven, I suspect that you did not fully insert the tail tube into the frame, and as a result, the torque tube is not plugged into the sockets in the gears at one or both ends of the torque tube.

Your one-way clutch may be damaged, or perhaps installed upside down.

You probably also ought to make sure all the teeth are really present on the torque tube drive gears, especially the front ones.

It's also possible that either the bevel gear or the spur gear on the forward tail rotor drive gear are slipping on the shaft.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
07-27-2013 05:50 PM  6 years ago
JuanRodriguez

rrProfessor

The Villages, Florida

MyPosts All Forum Topic
And the problem was ??????Been there, done that and old enough to know better.....
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-27-2013 01:34 PM  5 years ago
barrancomd

rrNovice

Memphis

MyPosts All Forum Topic
I THINK ITS TAIL BLOW OUT
Getting back
it was the front gear that was un-glue. Very tricky due to the fact that yoou examin the gears and all intact but when you apply torque the gear rotates by it self. Now after that solve I have what i understand it TAIL BLOW OUT. You can hover it and suddenly the heli spin on it own axis and it does it at any time at take off or during mid-flight. I hacve 3 of these and i refuse to give up. Does anyone has suggestions of what is the cause of this?
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-27-2013 02:04 PM  5 years ago
dkshema

rrMaster

Cedar Rapids, IA

MyPosts All Forum Topic
That's not tail blowout.

Tail blowout is what occurs during higher speed tail-first maneuvers. The gyro/tail rotor, for whatever reason, simply is unable to maintain the tail-first heading, and the heli quickly turns 180 degrees and suddenly you are in forward flight.

What you are seeing is something different. Blowout doesn't cause the heli to spin randomly, out of control.

You have something else going on.

You have three 250s, they are all the same design, and all three do this? Is that correct?

If that is the case, you need to look at your setup, not at the heli.

For the record, I own two 250s, however they are the belt-driven, older design, which works quite well. If I'm not mistaken, yours are the new torque tube driven tail.

How far out from center is the ball on the tail rotor servo? Which tail rotor servo are you using? What gain are you using; are you certain your gyro is operating in heading hold mode?

Are these flybarless, and if so, which controller are you using? What are you using for a receiver and how is it connected to the FBL controller? What transmitter are you using?

-----

You said the thing appears intact, yet the gear turns by itself. Does that mean the gear is turning by itself on the shaft? Which gear?

You also said you corrected that problem. How?
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-27-2013 05:51 PM  5 years ago
JuanRodriguez

rrProfessor

The Villages, Florida

MyPosts All Forum Topic
You said the thing appears intact, yet the gear turns by itself. Does that mean the gear is turning by itself on the shaft? Which gear?

You also said you corrected that problem. How?
Dave,

From a PM he sent me last nite, it looks like he got the first issue fixed by replacing the gear in question... the faulty one was slipping on the shaft....

Now, he has an issue which he termed tail blowout.... but I agree with you that it's not.... seems to me that either something is still loose on that drive train or something funky with his electronics.....

In the PM, he stated that it seems to do it intermittently..... sometimes after it's flying perfectly fine and then all of a sudden, the tail freaks out.........and sometimes right at takeoff into the hover.....

I suggested that he close this thread and start a new one with the new problems so as to avoid confusion.... but ????
Been there, done that and old enough to know better.....
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 1344 views POST REPLY
Home✈️Aircraft🚁Helicoptere-AlignT-REX 250 › ROTATION
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Sunday, August 18 - 2:31 pm - Copyright © 2000-2019 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online