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  #181  
Old 04-21-2021, 04:03 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,369
Default Mixture bellcrank

Here's another small Gotcha. Photo=1,000 words
The C-670 Bushing is pressed into VA-165 Mixture Bellcrank.
When the bellcrank is bolted to VA-164 Mixture Bracket, it doesn't freely rotate unless the bolt is left loose enough so it rotates. The result is friction against the flanges. Not correct in my mind.
The bushing should be captured by the bolt between the flanges so the bellcrank can rotate freely on the bushing.
Maybe not the correct fix, but I drove out the bushing. Then the Mixture Bellcrank was reamed to 3/8" and polished. A tiny bit was removed from each side of the bellcrank so the bushing was a few thou wider. A bit of Lubriplate applied. Slip the parts back together. Now when the bolt is tightened, the bellcrank rotates either way freely.
Yes, I scratched it a little. I have touch up paint.

Edit...
Ditch the Vans bushing. Every time I reassembled and tightened the bolt, the bushing swelled and the bellcrank froze up. Go to the local hardware store aviation department and but a steel spacer bushing. I got one 1/4" ID X 3/8" OD and almost exactly the right length for less than $2. A little sanding and polishing and the bolt can be torqued to spec. Bellcrank rotates like butta!
Click image for larger version

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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 01/01/2021, 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.

Last edited by wirejock : 04-22-2021 at 04:34 PM.
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  #182  
Old 04-21-2021, 04:15 PM
riseric's Avatar
riseric riseric is offline
 
Join Date: Oct 2011
Location: Québec, CNV9
Posts: 375
Default It won't show when flying...

Quote:
Originally Posted by wirejock View Post
Yes, I scratched it a little. I have touch up paint.
Attachment 10659
Good catch Larry!!!
Don't worry about the scratches, how many times do I have to remind myself that I'm not building a 35000$ Swiss Watch...
...wait a minute... my project will cost way more...
It won't show at cruise speed and altitude...
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Eric,
2021 dues happily donated
RV-8 slow built #83274
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro, EFII System 32, EarthX batteries
Aerosport IO-375, MTV-9-B/183
Skyview HDX
C-GEMQ
Almost done...
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  #183  
Old 04-21-2021, 04:53 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,369
Default Scratches

Quote:
Originally Posted by riseric View Post
Good catch Larry!!!
Don't worry about the scratches, how many times do I have to remind myself that I'm not building a 35000$ Swiss Watch...
...wait a minute... my project will cost way more...
It won't show at cruise speed and altitude...
Doesn't bother me. That's for the builders that always comment about stuff that doesn't matter just to point out the mistake. Figured I would save them the effort.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 01/01/2021, 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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  #184  
Old 04-30-2021, 08:55 AM
motodave motodave is offline
 
Join Date: Dec 2018
Location: Littleton, CO
Posts: 66
Default

Quick question, I'm also using a VPX will not be using the Garmin supplied shunt on the B lead... wonder what I want to measure with it? Thinking battery state charge / discharge, ideas? Single B&C 60a in my case.
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Dave
RV7 Slider N732DH reserved
I(O)360-M1B Thunderbolt
Empennage 100% Complete
Slow build Fuselage 95% done
Wiring .2% done
Then QB Wings
Littleton, CO
Photo log: https://www.flickr.com/gp/daves_photo_log/79v20C
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