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  #1  
Old 04-20-2020, 11:35 AM
Crafting N112DR's Avatar
Crafting N112DR Crafting N112DR is offline
 
Join Date: Oct 2013
Location: Powell, OH
Posts: 300
Default Second Test Flight Some Bumps In The Road

My second test flight was another success, Yes there were some issues again with the ADAHRS, and my right wing heavy got heavier. But I did got the trim indication dialed in. It's Phase I there are going to be bumps in the road.

Here are all the Videos:

Edited Short Version
https://youtu.be/FfrSL4bfT6E

Tail 360 Full flight (will work best on your phone or iPad)
https://youtu.be/s37mm0L2I9k

Full Flight
https://youtu.be/kYObV6e-UHI
__________________
___________
David Rohrlick
PPSEL, A&P
N112DR (RV-12iS) (SOLD)
Airworthiness signed off by the FAA 1/23/2020
First Flight on 3/14/2020
Phase I Finished on 5/7/2020
Serial#12-0864
https://youtube.com/c/CraftingN112DR
VAF donation made for 2021

Last edited by Crafting N112DR : 04-20-2020 at 11:49 AM.
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  #2  
Old 04-21-2020, 06:45 AM
John-G John-G is offline
 
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 759
Default

David,

Congratulations on getting your bird in the air!!!

As for the heavy wing .... I too had a heavy wing and easily solved it before getting draconian with the aft edge of the flaperons. Based on the advice of another builder (from Kentucky I believe), I checked the aft edge of the wing skins and found my issue. I'm talking about the aft portion of the wing skins that are cantilevered over the rear spar.

Before making any "adjustments" to the flaperons, give the following a try ... it solved my heavy wing issue. Use a straight edge and take measurements every few inches, tweaking the wing skin up or down as necessary so the wing skin aft of the rear spar is on the same plane as the wing skin forward of the rear spar. Below is a link to my blog with photos.

http://www.dogaviation.com/2016/11/w...eavy-wing.html

Once you know the wing skins are totally flat, you can move onto other solutions if the above procedure does not solve your heavy wing issue ... but at least you will know the wing skins are not contributing to the heavy wing.

Hope that helps ... it sure helped on my bird.

Happy flying,
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John
http://www.dogaviation.com/

RV-12 Wings, Empennage, Fuselage, Finishing, Avionics and Powerplant kits all completed
Now Flying!!

Donation paid until September 2021

Last edited by John-G : 04-21-2020 at 07:09 AM.
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  #3  
Old 04-21-2020, 09:52 AM
rvbuilder2002's Avatar
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,666
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When it comes to dealing with roll trim issues, there are numerous things that can cause an imbalance.

All of them should be considered because often times it is a combination of at least a couple of them that is causing the issue.

At other times, one of the issues may be present on both ailerons (or in the case of the RV-12, flapperons) which then causes a different issue that a novince RV flier may not recognize, such as excessively light aileron forces.

On the RV-12, there are 3 known causes of a roll trim imbalance, and all three are builder/workmanship related so they should all be considered to potentially exist on any RV-12.

They are
- Trailing edge shape of flapperons (can cause a control sensitivity issue even if not causing a roll trim imbalance)

- Shape of wing skin trailing edge

- Elevation of the flapperon. Particularly at the outboard end. This is influenced by the amount of insertion of the hinge rod ends.

In some cases it might be possible to adjust one cause to entirely solve the problem, but leave another that was the primary problem, unchanged.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.

Scott McDaniels
Hubbard, Oregon
Van's Aircraft Engineering Prototype Shop Manager
FAA/DAR
RV-6A (aka "Junkyard Special ")
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  #4  
Old 04-21-2020, 11:55 AM
HansLab HansLab is offline
 
Join Date: Jan 2015
Location: Netherlands
Posts: 140
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man! How many camera's did you hung up that bird anyway? Must've been a complete studio, didn't it? However: fantastic pics which I could only provide by several different flights.
Glad for you she flies so well, despite a heavy wing. Did you check the 'fold' of the flaperon, and the run of the upper plates touching the flaperons?
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build & sold project Kitfox IV
Project bought & flying RV12 #120742
Donation 2021 paid
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  #5  
Old 04-21-2020, 09:51 PM
Crafting N112DR's Avatar
Crafting N112DR Crafting N112DR is offline
 
Join Date: Oct 2013
Location: Powell, OH
Posts: 300
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Just 3 cameras,
2 GoPro Hero 5 black's (cockpit)
1 GoPro Fusion 360 (tail)

Working on Scotts 3 suggestions:

-Trailing edge shape

-Shape of wing skin trailing edge

-Elevation of the flapperon
__________________
___________
David Rohrlick
PPSEL, A&P
N112DR (RV-12iS) (SOLD)
Airworthiness signed off by the FAA 1/23/2020
First Flight on 3/14/2020
Phase I Finished on 5/7/2020
Serial#12-0864
https://youtube.com/c/CraftingN112DR
VAF donation made for 2021
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  #6  
Old 04-21-2020, 09:57 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,165
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I went old school and attached trim tabs to my flap Enron?s and rudder. Simple and effective.
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  #7  
Old 04-21-2020, 09:57 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,165
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I HAYE Spellcheck!🤬
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  #8  
Old 04-21-2020, 09:58 PM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
Posts: 3,165
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See what I mean? Arrgh!😜
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