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  #1  
Old 02-04-2016, 04:44 PM
Aero_Octaveus Aero_Octaveus is offline
 
Join Date: Aug 2014
Location: Edmonton, AB
Posts: 242
Default Tank Z-Bracket Layout

Don't want to bring this up yet again, but doing my research on the Tank Z-Brackets, there is one little bit of info that I wasn't clear on.

Using the Hurlbut/D.C method. Does a person locate the initial 1/8" diameter hole dead center in that exposed top side of flange? or does a person measure center on the bottom side (Where the bracket face meets the spar) I see that some say that their socket clearance requires that it moved outward 1/16" off center.

It seems the process was better described a number of years ago but that information now seems to be getting tough to find.

What proved to be the best way of placing the initial hole.
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Garet Hess - Edmonton, AB
RV-7A - Emp and Wings Done. Working on fuse
2021 Donation Current

http://garetsrv.blogspot.ca/

Last edited by Aero_Octaveus : 02-05-2016 at 12:22 AM.
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  #2  
Old 02-04-2016, 05:38 PM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,108
Default Holes

I centered mine but I have a set of thin wall 1/4 drive sockets.
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Larry Larson
Estes Park, CO
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Donated 12/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (3,000+ hours)
Empennage, wings, fuse, finishing kit done. Working FWF
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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  #3  
Old 02-04-2016, 09:42 PM
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longranger longranger is offline
 
Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,928
Default

I followed Jason Beaver's build site (he used what used to be known as the "Checkoway" method before Dan corrected us). Here's a paragraph from by build log:

I started out by positioning the center bolt hole on one flange of each z-bracket. This hole on the most inboard bracket is located 1/16" AWAY from the flange centerline to allow a socket to be used to torque the bolts for final installation. The other 6 z-brackets have this hole located 1/16" TOWARD the flange, which has the effect of moving the rivet holes that much farther from the bracket web to allow more room for use of a rivet puller when attaching the tank baffles.

It worked great. If I ever build another set of tanks, I'll do it the same way.
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RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site

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1955 Cessna 170B flying since 1982

'To get something you never had, you have to do something you never did.' -Unk.
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  #4  
Old 02-04-2016, 10:13 PM
rlmccarter rlmccarter is offline
 
Join Date: Oct 2014
Location: Charlotte, NC
Posts: 51
Default

I just finished my z brackets after heavy reading. Miles' site is great. I also referenced these two:

http://www.rv7-factory.com/?p=1333
http://rv-7construction.com/2010/09/...rackets-91110/

There are seven brackets on each wing. I numbered the bracket closest to the fuselage 1 and farthest from the fuselage 7. On bracket number 1 I drilled 4/16" from the bracket edge. On brackets 2 through 6 I drilled 5/16" from the edge. Everything looked great when I lined up the tank with leading edge and match drilled z brackets to baffles.

Fair warning - I haven't pop riveted the tanks in place yet, so the whole plan may fall apart.

Bob
2016 Dues Paid
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Last edited by rlmccarter : 02-04-2016 at 10:17 PM.
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  #5  
Old 02-05-2016, 12:21 AM
Aero_Octaveus Aero_Octaveus is offline
 
Join Date: Aug 2014
Location: Edmonton, AB
Posts: 242
Default Ahh ok. I'm getting it

The pieces are starting to fall together. So if I did follow the 1/16" offset way of doing things. You would find the exact center of the flange (as viewed from the aft of the bracket). This was the part that I was scratching my head over.

Like this then, correct??
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RV-7A - Emp and Wings Done. Working on fuse
2021 Donation Current

http://garetsrv.blogspot.ca/
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  #6  
Old 02-05-2016, 07:09 AM
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longranger longranger is offline
 
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Location: 45G, Brighton, MI
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Default

Garet, your drawing shows exactly what I did: offset from the centerline as measured on the outside of the flange.
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Miles (VAF# 1238, Paid up as of 12/20)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site

Construction Log

1955 Cessna 170B flying since 1982

'To get something you never had, you have to do something you never did.' -Unk.
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  #7  
Old 02-05-2016, 09:49 AM
Aero_Octaveus Aero_Octaveus is offline
 
Join Date: Aug 2014
Location: Edmonton, AB
Posts: 242
Default Thanks

Awesome!! Thanks for the input guys. It was throwing me off looking at the construction logs as some have drawn the center lines on different faces of the flange.

P.S. Go Broncos!
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Garet Hess - Edmonton, AB
RV-7A - Emp and Wings Done. Working on fuse
2021 Donation Current

http://garetsrv.blogspot.ca/
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  #8  
Old 02-10-2016, 03:04 PM
BenNabors BenNabors is offline
 
Join Date: Mar 2014
Location: Alabama
Posts: 153
Default What to check for:

Most of the fasteners screw in from the bottom side, the most inboard Z bracket fastens from the top. There is a close tolerance when placing a socket on with the vertical side of the z bracket. You can check this tolerance by placing a socket where the fastener will be to ensure that the socket will fit. You can also use a washer of equivalent diameter to the socket to find the required clearance and hole center.
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  #9  
Old 01-26-2017, 03:06 PM
Tag Tag is offline
 
Join Date: Jul 2014
Location: Phoenix, AZ and Senoia, GA
Posts: 100
Default Great Diagram Aero!

I'm just getting ready to do this; you've cleared it up for me...
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