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03-08-2016, 09:17 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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Thanks
Thanks. And thank you all for the information.
I hate spending days i. The shop with little or nothing to show for it.
Now I can go back in and hopefully get these blocks to cooperate.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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03-08-2016, 09:22 AM
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Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
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Quote:
Originally Posted by wirejock
I'm pretty sure the blocks are distorting a tiny bit as the nuts are brought to the correct value.
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Can you determine which way they're deforming? Maybe a shim or a little shaping of the top or bottom surface of the block could compensate for that and make them line up correctly when the bolts are tightened.
It seems like there's only one plane in which the block would be rotating as the bolts are tightened, at least enough to cause the binding you're seeing. It should be fairly simple to slip some thin shim stock, just a few thousandths at a time (like a strip of paper), under the inboard or outboard edge and see if that makes things better or worse.
Or maybe just a little more work on the weldment ends with emery cloth.
__________________
Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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03-08-2016, 09:30 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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Shims
Quote:
Originally Posted by DaleB
Can you determine which way they're deforming? Maybe a shim or a little shaping of the top or bottom surface of the block could compensate for that and make them line up correctly when the bolts are tightened.
It seems like there's only one plane in which the block would be rotating as the bolts are tightened, at least enough to cause the binding you're seeing. It should be fairly simple to slip some thin shim stock, just a few thousandths at a time (like a strip of paper), under the inboard or outboard edge and see if that makes things better or worse.
Or maybe just a little more work on the weldment ends with emery cloth.
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They rotate smoothly when the bolts are finger tight.
However, now that you mention it, I recall seeing the blocks move when the weldment is rotated. This implies, as you describe, something is out of alignment. I'll try it today.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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05-10-2020, 07:23 AM
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Join Date: Dec 2011
Location: Wiltshire, UK
Posts: 6
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Same problem....flap tube tight when tightening AN3 bolts
Great thread, and thanks for the ideas.....
I see this is a fairly old post, but I have exactly the same issue when torquing the nylon flap blocks.
Weldments sanded/ polished.... nylon blocks drilled square, no centre block even installed...and yet still the flap tube goes from 'ball-bearing' friction, to requiring a firm yank to move with bolts tightened.
I do like the idea of -A bolts and castle nuts....
Wondering if this is this a common issue... and how guys have solved it..?    :confused
Stay safe one and all..
Chris
__________________
Dues auto-paid..
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05-10-2020, 08:05 AM
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Join Date: Sep 2019
Location: Windsor, Ontario
Posts: 224
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I did mine yesterday and posted the results on Facebook RV-14 site.
https://www.facebook.com/photo.php?f...type=3&theater
https://scontent-yyz1-1.xx.fbcdn.net...1f&oe=5EDF6B31 (sorry the video is not working here but does on facebook)
I polished the flap torque tubes a fair bit then used a brake hone in the blocks. The blocks are not to be overtightened. I then got it to move with one finger very freely. After tightening the bolts that connect the tubes together it got a bit tighter but still very acceptable.
The link above is after everything is bolted to proper specs.
Sorry but not sure how to post pics & video.
__________________
Glenn Martin
Windsor, Ontario
1942 Tiger Moth
2017 Waco YMF-5
Kit # 140694
Received RV-14 Empennage Kit October 22, 2019
Started Tail Cone Dec 2019
Received QB Kit April 2020
Finished a mounted Tail Surfaces to Fuselage June 2020
2020 Dues Paid
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05-10-2020, 01:52 PM
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Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,005
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Do- polish the ends of the torque tube with emery cloth (or similar) till it turns easily in the plastic blocks.
Do not- try to sand out the plastic blocks as it will leave surface rough (collects dust & binds)
Do not- lubricate plastic blocks as it attracts dirt, stiffen & bind with age.
__________________
Ralph
built a few RVs, rebuilt a few more, hot rodded some, & maintained/updated a bunch more
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05-10-2020, 02:08 PM
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Join Date: Sep 2019
Location: Windsor, Ontario
Posts: 224
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Quote:
Originally Posted by Ralph Inkster
Do- polish the ends of the torque tube with emery cloth (or similar) till it turns easily in the plastic blocks.
Do not- try to sand out the plastic blocks as it will leave surface rough (collects dust & binds)
Do not- lubricate plastic blocks as it attracts dirt, stiffen & bind with age.
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The hone I used on the blocks actually "polished" the surface smoother than it was prior.
Also on the -14 plans section 34-03 step 4 says:
Step 4: Apply wheel bearing grease to the CS-0010-L & -R Torque Arm tubes in the areas that are not powder coated. See Figure 2.
__________________
Glenn Martin
Windsor, Ontario
1942 Tiger Moth
2017 Waco YMF-5
Kit # 140694
Received RV-14 Empennage Kit October 22, 2019
Started Tail Cone Dec 2019
Received QB Kit April 2020
Finished a mounted Tail Surfaces to Fuselage June 2020
2020 Dues Paid
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05-10-2020, 08:47 PM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
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After blocks are cut in two pieces, bolt them together and re drill the hole with a spade bit on slow speed. No need to use spacers.
__________________
VAF #897 Warren Moretti
2019 =VAF= Dues PAID
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