Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Heavy left wing7

Matronics Email Lists Forum Index -> Zenith-List

View previous topic :: View next topic

Author Message

goodings(at)yorku.ca
Guest

Posted: Wed Oct 03, 2007 6:20 pm Post subject: Heavy left wing7

The "heavy left wing" phenomenon is fairly common on the HD and HDS (I

don't know about the XL).  I think it is probably due mainly to

clockwise-rotating propeller torque.  Slightly incorrect offset angle of

the engine mount might be another reason.  Non-skid wing root material

won't be a contributor.  In other words, I can't give you a definitive

answer!  Has anyone experienced heavy RIGHT wing with a

counter-clockwise-rotating prop?  It would be fun to know.  I have never

heard of a case of heavy right wing.  We put our trim tab about half way

out along the aileron; the precise distance is not critical.  Further out

from the fuselage will have more effect.  It is absolutely NOT necessary

to go to the trouble of making two trim tabs, one for each wing; you have

better uses for your time!



John Goodings, C-FGPJ, CH601HD with R912S, Ottawa Carp/Toronto.

craig(at)craigandjean.com
Guest

Posted: Wed Oct 03, 2007 6:46 pm Post subject: Heavy left wing7

 	  Quote: 	
		   Has anyone experienced heavy RIGHT wing with a counter-clockwise-rotating

prop?  It would be fun to know.
	




Corvairs spin the "other" way.



-- Craig

leo(at)zuehlfield.com
Guest

Posted: Wed Oct 03, 2007 7:39 pm Post subject: Heavy left wing7

I was concerned with this "heavy left wing phenomena" a couple of years 

ago when I did my phase one flight testing.  I have an HDS with electric 

aileron and elevator trim.  I noticed that with both wing tanks full, my 

trim tab indicated that I had a "heavy left wing".  I landed and moved 

to the right seat, and took off,  you guessed it, I now had a "heavy 

right wing".  I find that I have to adjust aileron trim, or switch fuel 

tanks,  about every 10 minutes to maintain "hands off trim", solo or 

with passenger.  This topic has been beat to death in the past.  Do not 

archive.



Leo Gates

N601Z, CH601HDS TDO, Rotax 912UL



John M. Goodings wrote:

 	  Quote: 	
		   



 The "heavy left wing" phenomenon is fairly common on the HD and HDS (I

 don't know about the XL).  I think it is probably due mainly to

 clockwise-rotating propeller torque.

rloer(at)aceweb.com
Guest

Posted: Wed Oct 03, 2007 9:31 pm Post subject: Heavy left wing7

If I understand a trim tab on an aileron when you have a heavy or low left wing you put a tab on the left and bend it up which moves the aileron down and raises the wing.



If this is correct would it make a difference where or how far out on the aileron it was mounted?



Robert Loer

[quote]-----

planecrazydld(at)yahoo.co
Guest

Posted: Thu Oct 04, 2007 3:21 am Post subject: Heavy left wing7

the closer to the center of area that any force is applied the lower the extraneous forces the structure has to manage. In this case it is torsion on the aileron - and in this case the aileron is actuated from the end rib so it probably does not matter at all because the tab loads are constant and the control loads are reversing.



In the case of a wing leveling tab it does matter: the tab should favor high aspect ratio and be located as far outboard as possible to result in the lowest drag for any applied correction.



Oh wait a minute! This is real aircraft engineering data, applied to an airplane that may be around for much longer than the builder lives, where durability and fatigue resistance may actually be a concern...never mind.



do not archive

 

Dave Downey

  Harleysville (SE) PA

  100 HP Corvair



---

steveadams

Joined: 10 Jan 2006
Posts: 191

Posted: Thu Oct 04, 2007 3:52 am Post subject: Re: Heavy left wing7

I don't know about the 601, but the 640 and CH2000 drawings specify an aileron trim tab to be placed on the bottom inboard surface of the aileron, effectively pushing that aileron up. This makes sense to me as you are applying the trim tab force closest to the end rib actuator, thus there is less of a twisting force applied.



Steve

pmaxpmax(at)HOTMAIL.COM
Guest

Posted: Thu Oct 04, 2007 5:39 am Post subject: Heavy left wing7

My Corvair spins the "wrong way", and I have the slight left wing heavy thing, so it's not prop-wash.  I usually just fill the right tank only or burn fuel from the left tank first.  I find leaning my knee on the stick helps.



Phil Maxson

 601XL/Corvair 

 Northwest New Jersey

   

 > From: craig(at)craigandjean.com

 	  Quote: 	
		   To: zenith-list(at)matronics.com

 Subject: RE: Re: Heavy left wing7

 Date: Wed, 3 Oct 2007 20:44:01 -0600

 

 --> Zenith-List message posted by: "Craig Payne" <craig(at)craigandjean.com>

 

 > Has anyone experienced heavy RIGHT wing with a counter-clockwise-rotating

 prop? It would be fun to know.

 

 Corvairs spin the "other" way.

 

 -- Craig


	


Boo! Scare away worms, re.live.com/standard/en-us/purchase/trial.aspx?s_cid=wl_hotmailnews' target='_new'>Try now!  [quote][b]

davgray(at)sbcglobal.net
Guest

Posted: Thu Oct 04, 2007 8:41 am Post subject: Heavy left wing7

John

There is another method to consider shown on

http://www.ch601.org/builder%20resources.htm under the Bungee Trim heading.

To me the advantage would be to bias the system and assist the electric trim

system for single pilot operation.

In my aircraft with me at 218 lbs flying alone with evenly balanced fuel, my

electric trim tab is deployed 1/2 to 3/4 of full travel depending on air

speed.  I may install this modification to allow a nearly neutral trim tab

position and use the electric trim for fine the finer adjustments as fuel

burns off.



Gary Ray





---

graeme(at)coletoolcentre.
Guest

Posted: Thu Oct 04, 2007 2:30 pm Post subject: Heavy left wing7

If two identical wings are made I doubt the  condition you describe should be called heavy left wing.

 Your aircraft is rolling to the Left!

 If the two wings are identical 

 the weight of the pilot in the Lh side will cause roll to  the left.

 Other things to check is the wing incedance is correct  over the entire length of both wings.

 If this ok you should be able to place a trim tab on  Aileron to balance controls for the particular configoration 

 most commonly flown ( 1 person, two person)

 Roll to the left corrected by lifting Lh wing if tab  placed on lh aileron must be bent up (pushes down Lh aileron)

  

 Graeme Bell CH 701

   

 [quote]   ---

naumuk(at)alltel.net
Guest

Posted: Thu Oct 04, 2007 2:38 pm Post subject: Heavy left wing7

Thanks, Paul. Now I don't have to move my trim tab to the  other aileron!!!

 Bill Naumuk

HDS Fuse/Corvair

Townville, Pa

 [quote]   ---

naumuk(at)alltel.net
Guest

Posted: Fri Oct 05, 2007 3:36 pm Post subject: Heavy left wing7

Trying to follow too many strings. Sorry,  PHIL!

                                   do not archive

 Bill Naumuk

HDS Fuse/Corvair

Townville, Pa

 [quote]   ---

Display posts from previous:

	Matronics Email Lists Forum Index -> Zenith-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum