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  #1  
Old 11-17-2017, 05:05 PM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Mounting HS

I'm prepping the fuse and HS to drill the holes for mounting. There are four holes through the HS forward spar. Two go through the longerons and two inboard. The outboard holes are dependent on edge distances. I get that.
I can't find a dimension for where the two inboard holes should be drilled. I even looked through the CD for a plan. I can't find it.
Anyone?

Any tips appreciated as well.
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  #2  
Old 11-17-2017, 05:49 PM
Bevan Bevan is offline
 
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Hi Larry,

Look at drawing 27A. Lower right corner of the page you will find view C-C, " F-781 attach detail". It shows dimensions from the centre line.

Bevan.
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  #3  
Old 11-17-2017, 05:51 PM
mikemalone mikemalone is offline
 
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Someone beat me to the draw.
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Last edited by mikemalone : 11-17-2017 at 05:55 PM. Reason: Question already answered.
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  #4  
Old 11-17-2017, 06:42 PM
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This is very important! measure very carful here........ekk
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  #5  
Old 11-17-2017, 07:17 PM
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JonJay JonJay is offline
 
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One of the biggest areas for making mistakes on Edge Distances as Bret warns.
The edge distance here is the critical factor. Double check that the measurements shown layout to give you what you need on the HS angle and the longeron. Not a lot of margin here and you are drilling blind into the longeron.
I drilled a very small pilot hole then checked the underside of the longeron with a mirror to insure it was centered. While difficult once a pilot hole has been drilled, your goose isn't totally cooked yet as there are strategies to re-center the finished hole. Chances are, if you took the time to do this, all will be well because your paying attention.
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  #6  
Old 11-17-2017, 08:05 PM
RV74ME RV74ME is offline
 
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Yep, I was about to rivet on the aft deck and was thinking ahead to this point...as I anticipated that critical drill, I looked underneath the longeron and noticed my F710B angle was a bit short....so I’m gonna redo that part and get it to nest all the way in with the longerons to prevent an edge distance issue.
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Last edited by RV74ME : 11-21-2017 at 05:31 PM.
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  #7  
Old 11-17-2017, 08:12 PM
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wirejock wirejock is offline
 
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Default Edge distance

Thanks. Found it. Snake bit me.

Anyone else notice if the hole is perfectly centered in the longeron (5/16"), it violates the edge distance rule. Should be 3/8". No way to win.

I also made sure the F710D angle was nested against the longeron when I built it. Based on the previous, center of the longeron, edve distance there will also be 5/16" at best.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/01/2017. Plus a little extra.
RV-7A #73391, N511RV reserved (1,800+ 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 : 11-17-2017 at 08:18 PM.
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  #8  
Old 11-17-2017, 08:37 PM
tgmillso tgmillso is offline
 
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Hey Larry. Not sure if you're a normal size dude or a tiny little runt like myself, but the way I did this was mark out all my edge distances and desired drilling positions on the aft deck, then drilled down first with a #30 for all four bolt locations. This ensures you get the bolt holes exactly where you want them in the longerons. I then clamped the HS in place and drilled from inside the fuselage into the HS angles, which is where being a small guy comes in handy. My hole locations turned out to be absolutely perfect.
Tom.
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  #9  
Old 11-21-2017, 02:37 PM
Smilin' Jack Smilin' Jack is offline
 
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Larry,
I believe that edge distances only apply to sheet metal as discussed on this forum. That being said I believe it is critical to get the hole centered on the longerons angles. Be sure you have the rear spar supported as specified when you do all this pilot hole drilling

Jack
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  #10  
Old 11-21-2017, 04:37 PM
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wirejock wirejock is offline
 
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Default Supported?

Quote:
Originally Posted by Smilin' Jack View Post
Larry,
I believe that edge distances only apply to sheet metal as discussed on this forum. That being said I believe it is critical to get the hole centered on the longerons angles. Be sure you have the rear spar supported as specified when you do all this pilot hole drilling

Jack
I'll read the manual destructions again but I thought it had the forward holes drilled before the rear spar spacer is installed. I also called Vans and Sterling was a lot of help. He basically said get as close as possible to center on the longeron.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/01/2017. Plus a little extra.
RV-7A #73391, N511RV reserved (1,800+ 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.
Reply With Quote
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