VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-10
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #21  
Old 05-09-2012, 05:47 PM
Wesael's Avatar
Wesael Wesael is offline
 
Join Date: Feb 2009
Location: Brooksville
Posts: 282
Default How to change it

Quote:
Originally Posted by RV Jerry View Post
One degree diference in incidene is alot I typicaly try to get them witin one tenth of a degree
good luck ,Jerry
How would one change this on a quick build if they find a slight discrepancy (2/10ths inch)?
__________________
Weasel
RV-4 715hr Sold
RV-10 "School Bus"
I have changed my User Name to the correct spelling as it became availible. Please direct all correspondence to Weasel
Reply With Quote
  #22  
Old 05-09-2012, 11:25 PM
dhmoose dhmoose is offline
 
Join Date: Jun 2010
Location: Portland, OR
Posts: 337
Default Sweep and incidence

Quote:
Originally Posted by Wesael View Post
How would one change this on a quick build if they find a slight discrepancy (2/10ths inch)?
I have a QB -10 and when drilling for the wing attach, I thought I would simply follow the plans (cleco the hole in the rear spar, clamp the periphery, remove the cleco, and enlarge the hole). A very experienced builder helped me and said he wanted to confirm the sweep and incidence prior to simply following vans per-drilled hole. So, we did the formal measurements. Turns out, the sweep was significantly off (in the 1-2" range) and the incidence was also off (we measured to a 10th of a degree). Once things were set and prior to enlarging the pre-drilled hole in the rear spar, I looked through the hole and the holes were about three quarters of a diameter off. It surprised me, and confirmed the suspicions of the builder I was with. I would imagine that this could have caused a heavy wing if we simply took the pre-drilled hole and ran with it. I'm wondering if anyone else noticed this or heard of this or if it could explain the heavy wing here.
__________________
David Halmos
RV-10
Flying - 570+ hours
Portland, OR
Reply With Quote
  #23  
Old 05-10-2012, 02:11 PM
Space Cadet's Avatar
Space Cadet Space Cadet is offline
 
Join Date: Mar 2007
Location: Denver, CO
Posts: 211
Default Agree but...

I agree 1 deg is probably significant, but I don't think I can measure that accurate. There was about 1-deg variation just measuring out along the same wing. Have not done stalls yet, still breaking in an engine and keeping speeds high. Will try it this weekend maybe.

Anyway, I don't think I will mess with trying to change the incidence even if it is off, as long as using the trim tab will fix it. Hope to test that tomorrow if weather holds out and I'm not getting more sick than currently feel.

No one's got a picture or link to a typical trim tab?

Dwight
__________________
RV-10 #40762 - 100 hrs+
Denver, CO
Reply With Quote
  #24  
Old 05-11-2012, 06:46 AM
Bill.Peyton's Avatar
Bill.Peyton Bill.Peyton is offline
 
Join Date: Sep 2009
Location: St. Louis, MO
Posts: 1,788
Default

It seems to me I remember a post by Pierre, that he had to re-drill his rear spar attachment hole to fix a wing heavy. The plans allow for a slight enlargement if required. As I recall, there is an edge distance specified.
When we drilled the hole we followed the Vans instructions, and did not measure the incidence prior to drilling. I wish I had. We help Wayne G. drill his and measured first, his was within 1oths of a degree.
__________________
Bill Peyton
RV-10 - 1125 hrs
N37CP
First Flight Oct 2012
Aviation Partners, LLC
Reply With Quote
  #25  
Old 05-18-2012, 12:03 PM
Wesael's Avatar
Wesael Wesael is offline
 
Join Date: Feb 2009
Location: Brooksville
Posts: 282
Default Test Results

Ok I share the same situation (Heavy wing and dont want to do the trim tab).

I started looking real close at both wings to try to find the cause of the heavy wing.

If I looked real close at the wing tips I could see a very slight "dip" in the top rear section of the heavy wing tip. You can see it in this pic.



The other wind did not have this dip.

I decided to try getting the dip out and while I was at it maybe rais this area a little to create a little more lift on the heavy wing by carving some 2" foam into a wedge to make a stiffining rib inside the wingtip.

The problem that I ran into was by doing this the tip skin wanted to wrinkle when I raised it with the rib but I went ahead and epoxied the rib in place and while I was installing it I would guess that I saw it raise this area 1/4" or so.

The tip now lookes like this.



I test flew it and with everything equal. (Both tanks full) It is now only slightly right wing heavy. I would guess that I equelized aprox 1/2 of the imbalance

The result is, It is now close enough that If I start burning fuel from the right tank it will balance within 45min or so. I will leave it like this for a while to see if this will work for my likeing.
__________________
Weasel
RV-4 715hr Sold
RV-10 "School Bus"
I have changed my User Name to the correct spelling as it became availible. Please direct all correspondence to Weasel
Reply With Quote
  #26  
Old 05-18-2012, 03:07 PM
Bill.Peyton's Avatar
Bill.Peyton Bill.Peyton is offline
 
Join Date: Sep 2009
Location: St. Louis, MO
Posts: 1,788
Default

Weasel,
I just looked at your site. Very nice job! Who did the seats for you?
Bill
__________________
Bill Peyton
RV-10 - 1125 hrs
N37CP
First Flight Oct 2012
Aviation Partners, LLC
Reply With Quote
  #27  
Old 05-18-2012, 03:27 PM
Wesael's Avatar
Wesael Wesael is offline
 
Join Date: Feb 2009
Location: Brooksville
Posts: 282
Default Cleveland

Quote:
Originally Posted by Bill.Peyton View Post
Weasel,
I just looked at your site. Very nice job! Who did the seats for you?
Bill
DJ from Cleveland tools did em.
__________________
Weasel
RV-4 715hr Sold
RV-10 "School Bus"
I have changed my User Name to the correct spelling as it became availible. Please direct all correspondence to Weasel
Reply With Quote
  #28  
Old 05-18-2012, 03:49 PM
Space Cadet's Avatar
Space Cadet Space Cadet is offline
 
Join Date: Mar 2007
Location: Denver, CO
Posts: 211
Default Interesting one

That's an interesting one. I noticed that on the wing tip as well. Since all my other "adjustments" have done very little in general to improve things, I figured it wasn't worth trying.

If weather cooperates, I'll be flying a lot this weekend. I think I'm done experimenting with a fix and am just moving on with a tab for now. Need to finish Phase 1 to make OshKosh, and June is pretty full up with non-flying stuff.

Dwight
__________________
RV-10 #40762 - 100 hrs+
Denver, CO
Reply With Quote
  #29  
Old 05-18-2012, 05:38 PM
MauleDriver's Avatar
MauleDriver MauleDriver is offline
 
Join Date: Aug 2006
Location: Lake Ridge Aero Park - Durham NC
Posts: 199
Default My experience with elevator misalignment

I had an obvious mislignment between the elevators (I still don't know how to get it perfectly straight following the plans). It was giving me a 'heavy' left wing condition that required almost full right trim to correct.

I was able to significantly reduce the amount of right trim required for level flight at cruise by adjusting the relationship of the two elevator trim tabs. I would estimate 1/3 of the condition was relieved.

I then went and fixed the elevator alignment. This removed 80% of the heavy wing condition though some trim is still required.

Still some analysis required here but I thought I'd share in case it helps.
Reply With Quote
  #30  
Old 05-18-2012, 06:31 PM
N427EF N427EF is offline
 
Join Date: Oct 2005
Posts: 1,516
Default Additional trim spring

Here is something I have done to my 10 and it works beautifully.

Although my left wing was only slightly heavy with full fuel and quite balanced
at half full, it required right trim especially with passengers loaded in the back
and even more with full baggage.
Based on what I read in this thread I adjusted the elevator trim tabs to aid
the aileron. However, the trim tabs are already kind of weird the way they travel and adjusting them to where one is up on one side, and down on the other, is just not right.
Instead, I added a spring hooked up to a hose clamp around the aileron push tube in the wing. The other end of the spring is attached to a rib. Assuming you have electric aileron trim, this will aid the spring that is fully extended and increase trim effectiveness on the one side where you run out of trim.
The clamp allows you to adjust it to where this spring is neutral with just a tiny bit of pull to the one side that needs trim.
I installed this in the second inspection bay.
Result: Trim to the right is now twice as effective.
There is no perceptible resistance to the control stick especially not in flight.
I do have to add, that I use the right tank fuel first (mogas) before I resort to using the left tank making the slightly heavy right wing condition worse than it would be under normal tank switching conditions.
__________________
Ernst Freitag
RV-8 finished (sold)
RV-10 Flyer 600 plus hours
Running on E10 mogas
Don't believe everything you know.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 12:33 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.