VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-14
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 08-10-2014, 07:35 PM
caapt caapt is offline
 
Join Date: Feb 2013
Location: Pottsboro TX
Posts: 54
Angry Aileron Bell-crank Binding

Any one else have this problem? When I tork them down (85 inch/lbs) they bind up severely. The bellcrank is shorter than the brass bushing and even when they bind I can slide them up and down the bolt.
Any advice?
Reply With Quote
  #2  
Old 08-10-2014, 08:43 PM
longranger's Avatar
longranger longranger is offline
 
Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,720
Default

I had a similar problem with my RV-7 bellcranks. The inside bores were a bit rough at the welds, so I honed them out slightly with sandpaper taped to and wrapped around a dowel.

I also had a problem with a Dynon roll servo bracket that was misdrilled from the factory, causing the pivot bolt to bend slightly when torqued, and bind in the bellcrank. Dynon replaced the bracket at no charge, and the problem went away.

Hope this helps!
__________________
Miles (VAF# 1238, Paid up as of 12/2016)
RV-7 TU 904KM (reserved)
Wings Structurally Complete!!
SB Fuselage Just Past QB Stage


Construction Log
Picasa: Empennage Album, Wings Album, Fuselage Album


1955 Cessna 170B flying since 1982


'To get something you never had, you have to do something you never did.' -Unk.
Reply With Quote
  #3  
Old 08-11-2014, 09:24 PM
MauiLvrs's Avatar
MauiLvrs MauiLvrs is offline
 
Join Date: Jan 2008
Location: KTCY
Posts: 642
Default

Quote:
Originally Posted by caapt View Post
Any advice?
Have Vans send you a new one if it is binding up because of the bellcrank bore.
__________________
Dave & Trina
RV-9A Flying - 330 Hrs. Painted Finishing the interior.
Reply With Quote
  #4  
Old 08-12-2014, 07:39 AM
jlfernan's Avatar
jlfernan jlfernan is offline
 
Join Date: Jan 2006
Location: Port Orange, Fl
Posts: 469
Default

You don't need a new bellcrank. When they are welded the welds intrude into the tube the bushings fits into. Use the appropriate sized drill bit or reamer and clean out the welds inside the tube. This a very common issue.
__________________
http://www.mykitlog.com/JorgeF
Jorge Fernandez
Spruce Creek, FL
Reply With Quote
  #5  
Old 08-19-2014, 11:34 PM
caapt caapt is offline
 
Join Date: Feb 2013
Location: Pottsboro TX
Posts: 54
Smile mystery solved

Had my DAR take a look. The brass bushing (tube) is slightly bowed. Same problem with replacement tubes. By rotating the bushing in place we found a position that allowed free movement for that part of the arc that the bell crank needs to travel. Still binds up beyond that.
Reply With Quote
  #6  
Old 08-20-2014, 12:14 PM
KCBerner's Avatar
KCBerner KCBerner is offline
 
Join Date: Feb 2012
Location: Burleson, TX
Posts: 254
Default

Quote:
Originally Posted by caapt View Post
Had my DAR take a look. The brass bushing (tube) is slightly bowed. Same problem with replacement tubes. By rotating the bushing in place we found a position that allowed free movement for that part of the arc that the bell crank needs to travel. Still binds up beyond that.
Does this solve the problem? Is there any chance that it could become repositioned later and bind in flight?

Forgive me if I'm being an idiot, I'm trying to understand better for my own learning curve...
__________________
K.C.
RV-14A #140026
Wings 70%. Started on the Emp.
www.KCandAshleyBerner.com
Happy to be a 2016 =VAF= contributor
Reply With Quote
  #7  
Old 08-20-2014, 10:48 PM
petersb petersb is offline
 
Join Date: Mar 2008
Location: Toronto
Posts: 326
Default

Quote:
Originally Posted by caapt View Post
Any one else have this problem? When I tork them down (85 inch/lbs) they bind up severely. The bellcrank is shorter than the brass bushing and even when they bind I can slide them up and down the bolt.
Any advice?
If this is a brass bushing inside the weldment it is caused by the ends of the brass bushings not being square. When the bolt is tightened the brass bushing bows
__________________
RV7A New Dec 2013 - 360, C/S, slider
RV6 - 1600 Hours ---- Sold
Reply With Quote
  #8  
Old 08-21-2014, 07:55 AM
DaAV8R DaAV8R is offline
 
Join Date: Jul 2009
Location: Lee's Summit, MO
Posts: 741
Default Bellcranks

Quote:
Originally Posted by petersb View Post
If this is a brass bushing inside the weldment it is caused by the ends of the brass bushings not being square. When the bolt is tightened the brass bushing bows
I had this problem but determined that it was a function of the steel brackets not being bent exactly 90 degrees. A good way to check this is to assemble the brackets, bushing and bellcrank on the bench and check for free bellcrank movement and parallel legs on the steel brackets. Mine were great on the bench but would drag when installed on the spar.
__________________
Robert Williams
Lee's Summit, MO
RV-8 - Empennage & Wings Done
Working on Fuse
O-360-A1A

1946 Cessna 120
Reply With Quote
  #9  
Old 08-21-2014, 09:32 AM
caapt caapt is offline
 
Join Date: Feb 2013
Location: Pottsboro TX
Posts: 54
Default 3rd set of bushings in the mail

Talked to vans. They are sending another set of bushings. We are at a loss. Bellcrank has been reamed. Brass bushing is longer than bell crank. All are binding.
Reply With Quote
  #10  
Old 08-21-2014, 07:43 PM
rapid_ascent rapid_ascent is offline
 
Join Date: Mar 2008
Location: Dublin, CA
Posts: 821
Default

I had a problem with mine binding once it rotated past a certain amount. Vans said to sand the interior but that didn't seem to help. I ordered a new one and a new bushing to see how those work. I was thinking that my bushings might not be square on the ends. I sanded them to final length on my HF 1" belt sander so they probably aren't perfectly square on the ends.

I may try to rig up some sort of fence thing to keep it square. I'm not sure if this has anything to do with my problem but hopefully with the options I now have with the new parts I can get it to work correctly.
__________________
Ray Tonks
2016 Donation Paid
RV-7 Fuselage in progress
* Mid Fuselage Complete
* Aft Fuselage Complete
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
Shop Setup - In Progress (Gathering Tools, Never Complete)
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 10:29 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.