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Erroneous Plans sequence on elevators

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Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Thu Jan 08, 2009 8:44 pm Post subject: Erroneous Plans sequence on elevators

While it doesn't cause a major problem, I was a bit annoyed to find

out that the plans called for edge rolling the skins to full plans

pages after telling you to dimple them, where the dimples prevent a

nice neat edge roll. Page 9-7 calls for the dimpling in step 9. Page

9-9 step 7 calls for the edge roll. IMHO both 9-9 steps 7 and 8 should

be done before dimpling. Also a bit annoying that the foam rib

templates have no dimensions with them, so you don't know if the plans

page is exactly to scale or not. Given that the foam blocks are bigger

than the dimensions given in the plans for them, I'm not so confident

about the templates.



Kelly

40866, obviously on elevators

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Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

Phil.Perry(at)netapp.com
Guest

Posted: Thu Jan 08, 2009 9:15 pm Post subject: Erroneous Plans sequence on elevators

I can see where you're coming from and I usually try to roll my edges

before dimpling too.



However I wouldn't say the plans are wrong.  It really depends on the

tools you are using because some of edge rollers are thicker than

others; thus requiring more depth (from the edge) to roll correctly. 



I'll bet your edge roller runs relatively deep and that's the reason you

were running up on your dimples.



Good luck!  The tailcone is blast!



Phil

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Thu Jan 08, 2009 9:38 pm Post subject: Erroneous Plans sequence on elevators

I understand the difference in tools.  I'm using one of these: 

http://www.averytools.com/pc-45-70-edge-rolling-tool.aspx

It puts the bend right at the edge of the dimples, but because of the 

bump, you can't continue smoothly.

The plans were very clear on the rudder to edge roll before dimpling, so 

I'd expect at least a bit of consistency.



Perry, Phil wrote:

[quote] 



 I can see where you're coming from and I usually try to roll my edges

 before dimpling too.



 However I wouldn't say the plans are wrong.  It really depends on the

 tools you are using because some of edge rollers are thicker than

 others; thus requiring more depth (from the edge) to roll correctly. 



 I'll bet your edge roller runs relatively deep and that's the reason you

 were running up on your dimples.



 Good luck!  The tailcone is blast!



 Phil

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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

tsts4

Joined: 06 Aug 2007
Posts: 167
Location: Tampa, FL

Posted: Fri Jan 09, 2009 10:52 am Post subject: Re: Erroneous Plans sequence on elevators

Kelly,

I'm confused here.  The plans steps you listed don't jive with mine. Why are you dimpling the leading edge rivet holes?  The rivets called out are AD-41s which don't need a dimple.  



Also the templates in the plans are full sized.  That's why the steps say cut out and glue to the foam blocks-- you'll get 2 ribs from each block.  Personally I made copies so my plans would always have the originals in case I needed to make new ones in the future.

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Todd Stovall
aka "Auburntsts" on EAA and VAF
RV-10 N728TT -- Flying

Phil.Perry(at)netapp.com
Guest

Posted: Fri Jan 09, 2009 11:17 am Post subject: Erroneous Plans sequence on elevators

I think he's talking about slightly rolling the trailing edges of the

control surface to close any gaps that might exist around the

wedge-shaped insert.  



I don't think he's talking about the big broom-stick roll on the

trailing edge. 



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tsts4

Joined: 06 Aug 2007
Posts: 167
Location: Tampa, FL

Posted: Fri Jan 09, 2009 11:42 am Post subject: Re: Erroneous Plans sequence on elevators

Ahhhh. My mistake--apologies.  Not the leading edge but the trailing edge. I forgot that you put a bend on that edge as well.  I seem to recall that I just went slow and it turned out fine (I have the vise grip style edge roller).

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Todd Stovall
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RV-10 N728TT -- Flying

Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Fri Jan 09, 2009 4:45 pm Post subject: Erroneous Plans sequence on elevators

Correct.

Re the foam ribs, Copying the plans introduces a dimension change,

because unless you change the enlargement, most copiers add 2%

enlargement, and how does one know the originals from Van aren't a

copy of a copy?



On Fri, Jan 9, 2009 at 12:15 PM, Perry, Phil <Phil.Perry(at)netapp.com> wrote:

[quote] 



 I think he's talking about slightly rolling the trailing edges of the

 control surface to close any gaps that might exist around the

 wedge-shaped insert.



 I don't think he's talking about the big broom-stick roll on the

 trailing edge.



 --

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Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

tsts4

Joined: 06 Aug 2007
Posts: 167
Location: Tampa, FL

Posted: Fri Jan 09, 2009 6:05 pm Post subject: Re: Erroneous Plans sequence on elevators

My HP all-in-one made copies exactly the same size as the plans (I checked)-- I guess I got lucky.  As to whether the plans are copies of copies, I don't know.   There's an easy way to check.  The forward end of the ribs fit in between the rear spar flanges.  Just measure the distance between the flanges and compare to the width of the rib template.  I bet it's pretty darn close.  All I can say is I followed the plans and mine fit fine, and in 5 years since the -10 was released I don't recall anyone ever posting an issue with the templates here or over at VAF.  Granted, there can always be a first time, but I wouldn't worry too much about it--build on!

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_________________
Todd Stovall
aka "Auburntsts" on EAA and VAF
RV-10 N728TT -- Flying

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