Elevator Alignment

A forum in which to discuss topics specific to the assembly of the RV 8/8A
User avatar
plbarrett2004
Class E
Posts: 56
Joined: Tue Dec 18, 2012 7:47 am
Location: KDMW
Contact:

Elevator Alignment

Postby plbarrett2004 » Mon Dec 28, 2015 9:24 pm

After drilling the elevator horns, I have a slight mis-alignment. With the elevator horn drilled and bolted at both ends I clamped the right elevator at the counterweight. Image

The result is a slightly high left counterweight arm. It only about 1/16th to 3/32" max. I figured the trailing edge was more important, so I decided to examine that.
Image

The best way I could figure to examine the trailing edge was to compare its level with one side clamped to the horizontal stab. I played around with multiple configurations. Using both a regular level, and a digital level.
Image
Image

The digital level reads 0.2 degrees high on the right when placed on the horizontal stab. On the elevator it reads 0.4 degrees high on the right. So thats a 0.2 degree difference. So the question then becomes, what to do about it? I guess there are two options; 1) Leave it as is, and adjust what I can when I do the fiberglass around the counterweight arms, or 2) Weld and re-drill the elevator horn to control rod intersection.

Yeah, its probably a "build on" but with the control surfaces I hate seeing any misalignment.

Thoughts from the brain trust?
Peter Barrett
CFI, CFII, MEI
RV-8 Fastback - Fuselage in progress
Build Log @ papalimabravo.com
SEMPER FIDELIS

User avatar
bruceh
Class D
Posts: 361
Joined: Sun Apr 06, 2008 11:11 pm
Location: Ramona, CA
Contact:

Postby bruceh » Mon Dec 28, 2015 10:42 pm

I would consult with Van's first. It might be negligible to the flight characteristics, but you won't know until you fly it. Getting the hole on one side welded over to redrill would be the simple fix.
Bruce Hill
RV-9A N5771H flying over 700 hours!
http://www.overthehills.com/RV-9A-Project
APRS Tracking: http://aprs.fi/#!mt=roadmap&z=11&call=a ... tail=21600
EAA Tech Counselor

User avatar
captain_john
Sparky
Posts: 5879
Joined: Sun Oct 31, 2004 9:17 am
Location: KPYM

Postby captain_john » Tue Dec 29, 2015 9:43 am

Peter,

I secong the call to Van, however I will go one step further and bet that they will tell you to build on.

Please let us know what they end up telling you! I am curious.

:) CJ
RV-7
Garmin G3X with VP-X & a TMX-IO-360 with G3i
It's all over but the flying! 800+ hours in only 3 years!

User avatar
plbarrett2004
Class E
Posts: 56
Joined: Tue Dec 18, 2012 7:47 am
Location: KDMW
Contact:

Postby plbarrett2004 » Tue Dec 29, 2015 10:46 am

Thanks all.

Here's the response from Ken @ Van's: "Actually, that's darn close to perfect alignment. Nail it down before it gets away."

Even after reading that it is still bothering me. So, I'm going to leave it alone for now. If it still bothers me when I start flying I can fix it then.
Peter Barrett
CFI, CFII, MEI
RV-8 Fastback - Fuselage in progress
Build Log @ papalimabravo.com
SEMPER FIDELIS

User avatar
captain_john
Sparky
Posts: 5879
Joined: Sun Oct 31, 2004 9:17 am
Location: KPYM

Postby captain_john » Tue Dec 29, 2015 3:53 pm

Peter, You don't take a compliment very well!

hahaha

Gitter DONE!

:) CJ
RV-7
Garmin G3X with VP-X & a TMX-IO-360 with G3i
It's all over but the flying! 800+ hours in only 3 years!

User avatar
plbarrett2004
Class E
Posts: 56
Joined: Tue Dec 18, 2012 7:47 am
Location: KDMW
Contact:

Postby plbarrett2004 » Tue Dec 29, 2015 9:04 pm

Nothing a beer or several won't cure!
Peter Barrett
CFI, CFII, MEI
RV-8 Fastback - Fuselage in progress
Build Log @ papalimabravo.com
SEMPER FIDELIS

User avatar
captain_john
Sparky
Posts: 5879
Joined: Sun Oct 31, 2004 9:17 am
Location: KPYM

Postby captain_john » Tue Dec 29, 2015 10:13 pm

I like the way you think!

:beer: CJ
RV-7
Garmin G3X with VP-X & a TMX-IO-360 with G3i
It's all over but the flying! 800+ hours in only 3 years!

User avatar
Wicked Stick
Class B
Posts: 1000
Joined: Wed Feb 09, 2005 10:00 pm
Location: KEWB

Postby Wicked Stick » Sat Jan 02, 2016 2:09 am

plbarrett2004 wrote:Thanks all.

Here's the response from Ken @ Van's: "Actually, that's darn close to perfect alignment. Nail it down before it gets away."

Even after reading that it is still bothering me. So, I'm going to leave it alone for now. If it still bothers me when I start flying I can fix it then.


The small amount you are off won't matter. Worry more about the wing incidence alignment and the ailerons being where they should be.
Dave "WS" Rogers
RV-8 (125 hrs & counting)
N173DR


Return to “RV 8/8A”

Who is online

Users browsing this forum: No registered users and 2 guests