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03-15-2017, 06:07 AM
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Join Date: Nov 2015
Location: Belle River, Ontario, Canada
Posts: 8
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First replacement part order
I got my workshop finally set up and tools in hand and decided to take a look at the -7A empennage kit that I picked up last October from a gentleman who started it but only got so far before life got in the way.
He left it at the "HS needs only to be deburred, primed and assembled" stage, but looking at the two HS-702s I thought something was amiss with the relief notches
After seeing other examples online, I decided to scrap these two parts and use them for practice, along with the existing spar doublers. I ordered two new spars and doublers, which shipped yesterday.
So, can it be said that these spars were not airworthy?

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03-15-2017, 06:34 AM
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Join Date: Jul 2013
Location: Clarkston, MI
Posts: 344
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Umm.... wow. Just... wow.
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03-15-2017, 06:36 AM
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Join Date: Jul 2016
Location: Worland, Wyoming
Posts: 389
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You are correct not what I would consider air worthy (not enough edge distance on some holes). This is definitely a tricky area though. I had to rework this area not once but twice! This area gave me an intense amount of grief but eventually got past it. You may also want to check the HS-00005 ribs (where it meets the spar doubler) as the holes may not have edge distance on those either. Lastly I would check edge distance on both HS-710 and HS-714. Hmmmm is it bad or good that I have all those part numbers memorized... haha
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Jereme Carne
PPL
RV-7A Emp. coming along
Working on Wings
Exempt but gladly paying!
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03-15-2017, 06:39 AM
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Join Date: Jul 2016
Location: Worland, Wyoming
Posts: 389
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Also, looking at the spars again, the flange was cut too low into the radius and there is in no way shape or form enough angle on the existing flange, those will almost definitely interfere with HS-00005.
__________________
Jereme Carne
PPL
RV-7A Emp. coming along
Working on Wings
Exempt but gladly paying!
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03-15-2017, 07:16 AM
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Join Date: Jul 2007
Location: Atlanta, GA
Posts: 113
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Later, in that area, there's a step where you are assembling a front spar, a rib "coming in from aft", and the angle you have to fabricate (sorry, I don't have the part numbers). Edge distance is tricky as you need to get it right going through 3 pieces. I'd definitely read up on that before attempting it. IIRC, I failed the game of "Van's says" in that area, 2x, and should have waited until later ("Van did not say to drill yet").
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Ty Connell
Atlanta, GA
EAA Chapter 690
VAF dues paid monthly
ty.connell@gmail.com
N997TL reserved
RV-9(A?) empennage in progress
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03-15-2017, 07:31 AM
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Join Date: Jan 2011
Location: Madison, AL
Posts: 48
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Service bulletin
Good catch. If the kit did not come with the doublers, older kids did not, now would be the best time order and install them.
Brian
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03-15-2017, 08:05 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 2,849
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Relief notch
I see that often on here.
The pilot hole for those relief notches should be drilled right in the vertex of the flange and web. Prop it up at a 45 degree angle. Center punch the mark then drill a small hole before moving up to 1/4".
In the meantime welcome a day have some fun with the scrap parts.
__________________
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.
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03-15-2017, 09:08 AM
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Join Date: Nov 2015
Location: Belle River, Ontario, Canada
Posts: 8
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Quote:
Originally Posted by bscycleman
Good catch. If the kit did not come with the doublers, older kids did not, now would be the best time order and install them.
Brian
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Thanks. It's not even a year old, so it came with them already. I ordered new ones to replace the existing drilled ones.
__________________
Todd
Belle River, Ontario
Tooling up, finishing shop
RV-7A #74495 under construction
October 2016 donation made
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03-16-2017, 06:58 AM
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Join Date: Nov 2015
Location: Belle River, Ontario, Canada
Posts: 8
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Quote:
Originally Posted by wirejock
I see that often on here.
The pilot hole for those relief notches should be drilled right in the vertex of the flange and web. Prop it up at a 45 degree angle. Center punch the mark then drill a small hole before moving up to 1/4".
In the meantime welcome a day have some fun with the scrap parts.
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Thanks for the tip Larry!
__________________
Todd
Belle River, Ontario
Tooling up, finishing shop
RV-7A #74495 under construction
October 2016 donation made
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