Go Back  RCU Forums > RC Helicopters > Electric RC Helis > T-Rex heli
 trex xl pitch set up >

trex xl pitch set up

Notices
T-Rex heli For all you T-Rex lovers out there, this where you can post!

trex xl pitch set up

Old 10-12-2006, 10:10 AM
  #1  
Senior Member
Thread Starter
My Feedback: (4)
 
Join Date: Oct 2002
Location: RIDGEFIELD, NJ
Posts: 509
Likes: 0
Received 1 Like on 1 Post
Default trex xl pitch set up

Hey guys,Can someone tell me how to set the pitch and how to check it????I would like to set up my idle up and check after a blade change,tracking but I had my lhs set me up but I need to know .Also what do you guys think of the new t.p. exterme batts.?????
thanks Fred
Old 10-12-2006, 11:14 AM
  #2  
Senior Member
 
Join Date: Apr 2006
Location: Lincoln, UNITED KINGDOM
Posts: 278
Likes: 0
Received 0 Likes on 0 Posts
Default RE: trex xl pitch set up

You should own a pitch gauge, a small device that clips onto the blade to measure its angle.

THE MOTOR MUST BE DISCONECTED.

Assuming you have one, place it on the blade according to the instructions and put the TX in idle up.
Move the throttle/pitch lever from min to max, you should get about -11 to +11 degrees movement on the blade. Adjust servo throws/pitch throw untill you do. Idle up should have a pitch curve that allows full pitch change. 0 - 50 - 100

Change to normal/hover. The pitch curve should be set approx 40 - 50 - 100 to give about -4 to +11 degrees of pitch.

Take off the pitch gauge.

Reconnect the motor.

If you balanced the blades correctly you should have some coloured tape on one of them. This is important for tracking.
Run up the rotor to centre stick (throttle) so the blades are zero pitch. Look at the blade tips, are they tracking together or can you make out two tracks in the air? If the tracking is close, bring it up to eye level hover. The extra load will increase tracking differences and make it easier to see.

The coloured tape on one blade should make it easy to tell which blade is which while they're spinning. You need to increase the pitch of the lower blade, or decrease the higher plades pitch.
To do this, land. Disconect the battery. Disconect the linkage to ONE of the blades and give half a turn on the connection to either increase or decrease the pitch. Which way you turn it depends on the model and which blade (higher or lower) you chose to adjust.

Reconnect everything and return to hover. Check blade tracking and repeat.

Everytime you change blades you need to check the tracking. Minor differences between blades that can't be seen by eye will make them fly differently.
Old 10-13-2006, 06:00 PM
  #3  
Senior Member
Thread Starter
My Feedback: (4)
 
Join Date: Oct 2002
Location: RIDGEFIELD, NJ
Posts: 509
Likes: 0
Received 1 Like on 1 Post
Default RE: trex xl pitch set up

Hi Karyn,I had to drop the pitch set up in idle 1&2 for now but I will try your help and get back to you soon.I now have a more pressing problem that I must fix now with my rex.Maybe you seen this before,when I give a elevator input I get full movement,but when I put in a aileron input I get very little movement,if I turn the rotor 90* I get full aileron movement and very little elevator movement,same thing each 90* turn.These turns are done by hand.When I try to fly the controls are very very sloppy.What do you think is wrong?
thanks Fred
Old 10-13-2006, 07:50 PM
  #4  
Senior Member
 
WhtBronco's Avatar
 
Join Date: Oct 2002
Location: Winchester, VA
Posts: 2,084
Likes: 0
Received 0 Likes on 0 Posts
Default RE: trex xl pitch set up

Is your head speed too low? The T-rex flies better with higher head speeds IMO, over 1600 rpm.
Old 10-14-2006, 04:18 PM
  #5  
 
FLYMIKE's Avatar
 
Join Date: Jun 2006
Location: Salt Lake City, UT
Posts: 605
Likes: 0
Received 0 Likes on 0 Posts
Default RE: trex xl pitch set up


ORIGINAL: ffdq

Hi Karyn,I had to drop the pitch set up in idle 1&2 for now but I will try your help and get back to you soon.I now have a more pressing problem that I must fix now with my rex.Maybe you seen this before,when I give a elevator input I get full movement,but when I put in a aileron input I get very little movement,if I turn the rotor 90* I get full aileron movement and very little elevator movement,same thing each 90* turn.These turns are done by hand.When I try to fly the controls are very very sloppy.What do you think is wrong?
thanks Fred
Check your flybar control lever just above the swashplate and make sure the hinge is not overtightend. If the hinge moves freely then double check linkage lengths. Mike
Old 10-14-2006, 06:17 PM
  #6  
Senior Member
Thread Starter
My Feedback: (4)
 
Join Date: Oct 2002
Location: RIDGEFIELD, NJ
Posts: 509
Likes: 0
Received 1 Like on 1 Post
Default RE: trex xl pitch set up

Hi Mike,the fly bar is free I checked the rods twice and they are right and the control hourns are at 90*.The rear of the swash plate comes up every 90* no matter what I remove like the servo hourns or head rods.
Fred
Old 10-14-2006, 07:26 PM
  #7  
 
FLYMIKE's Avatar
 
Join Date: Jun 2006
Location: Salt Lake City, UT
Posts: 605
Likes: 0
Received 0 Likes on 0 Posts
Default RE: trex xl pitch set up

Ok, so when you turn the blades by hand the rear of the swash moves up? Is this right? If this is whats happening then you can isolate it by starting with the elevator servo. take the linkage off your servo at the ball. with the blades facing foward and back check movement of elevator and with blades side to side. There are four corners on the swashplate and one of those linkes could be tight or one could be longer than the other.
Old 10-14-2006, 07:42 PM
  #8  
Senior Member
Thread Starter
My Feedback: (4)
 
Join Date: Oct 2002
Location: RIDGEFIELD, NJ
Posts: 509
Likes: 0
Received 1 Like on 1 Post
Default RE: trex xl pitch set up

yes thats right,have you seen this before?
Old 10-14-2006, 07:43 PM
  #9  
 
FLYMIKE's Avatar
 
Join Date: Jun 2006
Location: Salt Lake City, UT
Posts: 605
Likes: 0
Received 0 Likes on 0 Posts
Default RE: trex xl pitch set up

Now if this is happening when you have your swash angled this is normal.
Old 10-14-2006, 07:47 PM
  #10  
Senior Member
Thread Starter
My Feedback: (4)
 
Join Date: Oct 2002
Location: RIDGEFIELD, NJ
Posts: 509
Likes: 0
Received 1 Like on 1 Post
Default RE: trex xl pitch set up

I,m checking now
Old 10-14-2006, 07:55 PM
  #11  
Senior Member
Thread Starter
My Feedback: (4)
 
Join Date: Oct 2002
Location: RIDGEFIELD, NJ
Posts: 509
Likes: 0
Received 1 Like on 1 Post
Default RE: trex xl pitch set up

with the blades front to back the swash plate moves up,with the blades side to side the swash moves to level
Old 10-14-2006, 08:00 PM
  #12  
 
FLYMIKE's Avatar
 
Join Date: Jun 2006
Location: Salt Lake City, UT
Posts: 605
Likes: 0
Received 0 Likes on 0 Posts
Default RE: trex xl pitch set up

Yah, but there shoulnt be any binding. Do they move freely?
Old 10-14-2006, 08:04 PM
  #13  
Senior Member
Thread Starter
My Feedback: (4)
 
Join Date: Oct 2002
Location: RIDGEFIELD, NJ
Posts: 509
Likes: 0
Received 1 Like on 1 Post
Default RE: trex xl pitch set up

yes they move freely no binding
Old 10-14-2006, 08:08 PM
  #14  
 
FLYMIKE's Avatar
 
Join Date: Jun 2006
Location: Salt Lake City, UT
Posts: 605
Likes: 0
Received 0 Likes on 0 Posts
Default RE: trex xl pitch set up

Ok, so if your links are the same size on each side of the swash and the wobble is minimal then this is normal and i think its called oscalating.
Old 10-14-2006, 08:10 PM
  #15  
Senior Member
Thread Starter
My Feedback: (4)
 
Join Date: Oct 2002
Location: RIDGEFIELD, NJ
Posts: 509
Likes: 0
Received 1 Like on 1 Post
Default RE: trex xl pitch set up

I,m going to try it be back in 10 mins.standby plz.
Old 10-14-2006, 08:25 PM
  #16  
Senior Member
Thread Starter
My Feedback: (4)
 
Join Date: Oct 2002
Location: RIDGEFIELD, NJ
Posts: 509
Likes: 0
Received 1 Like on 1 Post
Default RE: trex xl pitch set up

hi Mike no help I give up.I will bring it to the lhs on sunday,maybe he can help me at a cost for sure.
thanks Fred
Old 10-14-2006, 08:33 PM
  #17  
 
FLYMIKE's Avatar
 
Join Date: Jun 2006
Location: Salt Lake City, UT
Posts: 605
Likes: 0
Received 0 Likes on 0 Posts
Default RE: trex xl pitch set up

Sorry dude, these things have alot of working parts and if one not funtioning right there all not functioning right. But to tell you the truth I still dont know what your talking about. Hope it works out. Mike
Old 10-14-2006, 08:41 PM
  #18  
Senior Member
Thread Starter
My Feedback: (4)
 
Join Date: Oct 2002
Location: RIDGEFIELD, NJ
Posts: 509
Likes: 0
Received 1 Like on 1 Post
Default RE: trex xl pitch set up

Mike thats ok I dont know what I,m talking about either I new to helis,but thanks anyway.
Fred
Old 10-14-2006, 08:46 PM
  #19  
 
FLYMIKE's Avatar
 
Join Date: Jun 2006
Location: Salt Lake City, UT
Posts: 605
Likes: 0
Received 0 Likes on 0 Posts
Default RE: trex xl pitch set up

Ill send you a pm with my # and if you want to call me and figer this out you can. But it will be long distance. Mike
Old 10-14-2006, 08:51 PM
  #20  
Senior Member
Thread Starter
My Feedback: (4)
 
Join Date: Oct 2002
Location: RIDGEFIELD, NJ
Posts: 509
Likes: 0
Received 1 Like on 1 Post
Default RE: trex xl pitch set up

Mike,I,m going to hit the sack now but thats a nice offer and I would take you up on it but I,m fried.
thanks anyway Fred
Old 10-15-2006, 09:40 AM
  #21  
Senior Member
 
Join Date: Dec 2005
Location: Markleysburg, PA
Posts: 268
Likes: 0
Received 0 Likes on 0 Posts
Default RE: trex xl pitch set up

ffdg,
There are several things to check.
1) bent mainshaft
2) bent feathering shaft
3) swash seperation
4) one of the balls put on the swash plate or blade grip at an angle
5) loose screw on one of the balls causing the screw to bend slightly
6) bearing on mainshaft not seated correctly cusing misalignment of mainshaft
In one extreme case that I read about, the main rotor housing came from the factory off center. the person put a metal housing on and the problem was cured.

As to the sloppy controls when flying here are several things to check.
1) servo gear stripped.
2) ball link cracked (the threaded part)
3) servo moving on frame
4) something too tight or too loose as stated here and your other post.
5) end points, atv's , or expo set incorrectly in the radio.
I haven't see where you posted you setup. Please post the info and watch the Finless videos, ccpm setup part 1 and 2. I'm pm'ing you the address.

Good Luck
Don
Old 10-16-2006, 12:03 PM
  #22  
Junior Member
 
Join Date: Mar 2006
Location: Tlaxcala, MEXICO
Posts: 16
Likes: 0
Received 0 Likes on 0 Posts
Default RE: trex xl pitch set up

I have a similar problem with pitch of my Trex, but help much a video of "Bod White". there are some setup videos

but in this moment i dont remember the name of the web side or forum.[]


Regard

Rafael
Old 10-16-2006, 12:40 PM
  #23  
Senior Member
Thread Starter
My Feedback: (4)
 
Join Date: Oct 2002
Location: RIDGEFIELD, NJ
Posts: 509
Likes: 0
Received 1 Like on 1 Post
Default RE: trex xl pitch set up

Well my lhs found the problem,it turned out to be the washout linkage scerws.I tighten them while I was going over evrything.No exp. with helis.what can I say but who is the a.h.me thats who.Thanks for the help guys.
Fred

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Thread Tools
Search this Thread

Contact Us - Manage Preferences Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.