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  #11  
Old 01-09-2021, 05:10 PM
skydiverlv skydiverlv is offline
 
Join Date: Jul 2008
Location: kansas
Posts: 338
Default Screw the screws

I swapped most of my phillips screws with these.
https://www.albanycountyfasteners.co...p/1080-066.htm
Also they seem to have a smoother feel when installing than the Vans issued phillips. I use Boelube when installing.
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  #12  
Old 01-09-2021, 06:25 PM
scsmith scsmith is offline
 
Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,761
Default structure? yes.

To answer the OP's question, the answer is yes. In a monocoque structure, just about every panel contributes to torsional stiffness in one way or another. Every bulkhead cover, seat pan, baggage floor, that sort of thing, closes out bays that create torsional stiffness.

Torsional stiffness is especially challenging in the cockpit area where the main fuselage 'tube' is cut open to create the cockpit. If you want to visualize this, take an empty paper towel tube, and cut a rectangular hole in it roughly in proportion to what your RV-6,7,8,9 cockpit opening is. Now twist the tube and watch.

Lots of modifications can reduce or even cripple torsional strength. A common one is the access panel that people put in the bulkhead of RV-8s between the instrument panel area and the baggage compartment. If that access panel closes with lots of screws along the perimeter of the cut-out, great. If it just has a latch or two along one edge, not good. Another approach besides lots of screws around the perimeter would be to put a heavy doubler around it -- the bulkhead contributes to torsional stiffness by maintaining the cross section shape. A doubler will help do that - it basically prevents the compromised bulkhead from buckling.
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  #13  
Old 01-15-2021, 03:48 PM
echowhiskey echowhiskey is offline
 
Join Date: Jan 2020
Location: Charlemont
Posts: 24
Default

Thanks Steve for the analogy. After looking at how everything is put together and thinking it through, I could only conclude they were critical to the structure. However, I was thinking it was more critical to the wing to fuselage assembly. Your description certainly makes sense as well. However does not the latched canopy also contribute to creating torsional stiffness? Or not so much?

The problem I was having was a few of the screw threads had stripped out. Easy fix. I am happy to report the assembly was put together better than how I found it!
Piece of Mind.
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  #14  
Old 01-15-2021, 06:33 PM
mturnerb mturnerb is offline
 
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Location: Ponte Vedra, FL
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I ordered these and they are great:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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  #15  
Old 01-15-2021, 07:04 PM
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scard scard is offline
 
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Location: Cedar Park, TX
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Default

Quote:
Originally Posted by echowhiskey View Post
However does not the latched canopy also contribute to creating torsional stiffness? Or not so much?
The contribution of these latched canopies (talking about an RV), to overall fuselage torsional stiffness, is exceptionally small. I would be surprised if Vans engineers even considered it seriously in their margin calculations.
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  #16  
Old 01-16-2021, 09:49 AM
330Jock 330Jock is offline
 
Join Date: Jul 2011
Location: Norfolk, VA
Posts: 114
Default Seat Panel Screws

I bought the Vessel brand of JIS screwdrivers on Amazon, cheaper and appears to be the same one McMasters sells. My whole wall of Philips screwdrivers are now just collecting dust. Has definitely changed my view of Philips screws!
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  #17  
Old 01-16-2021, 10:21 AM
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MacCool MacCool is offline
 
Join Date: Aug 2020
Location: central Minnesota
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Default

Quote:
Originally Posted by 330Jock View Post
I bought the Vessel brand of JIS screwdrivers on Amazon, cheaper and appears to be the same one McMasters sells. My whole wall of Philips screwdrivers are now just collecting dust. Has definitely changed my view of Philips screws!
so...a question:

It appears that JIS screwdrivers are designed to work with JIS screws. It also appears that using a US Phillips screwdriver in a JIS screw will have a higher potential for damaging the screw. What about using a JIS screwdriver or bit with US Phillips screws? Does that allow more torque with less potential for damage to the Phillips screw?
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  #18  
Old 01-16-2021, 10:35 AM
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Ironflight Ironflight is offline
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Join Date: Jan 2005
Location: Dayton, NV
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Default

Quote:
Originally Posted by MacCool View Post
so...a question:

It appears that JIS screwdrivers are designed to work with JIS screws. It also appears that using a US Phillips screwdriver in a JIS screw will have a higher potential for damaging the screw. What about using a JIS screwdriver or bit with US Phillips screws? Does that allow more torque with less potential for damage to the Phillips screw?
This is exactly what everyone is doing - using the JIS screwdriver with their standard Phillips head screws....and it works great!

I think I have four JIS drivers scattered about the shop[ now, and the Phillips drivers are put away.
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