Re: [f-AA] What is the washout angle for the Champ

[Sam Burke]

I have been unable to find the washout angle spec for the L16a which must be the same as for the Champ. My guess is  2.0 degrees forward twist compared to the root of the wing. I have been using a 24 in stiff board to support my iPhone running the iHandy Level application to make the measurement. 

Regards,
Sam Burke N6404C  1947 L16A  C85-12  7BCM-296  USAF 47-1076

[Sam Burke]

It appears that no one has adjusted their wing washout on a Champ!  I was told my my IA that it needed to be adjusted to be within spec, still looking for the spec. 

[colie pitts]

Sam , there is no spec on the wash out per se. There is a short section on wing rigging in your champ maintenance manual and here is a writeup by Buzz Wagner.

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colie pitts

[Mark Peterson]

I'm the one who asked the question that Buzz answered with the paper.   My understanding in the years hence, is that
the rear strut is used to trim out any wing heaviness or stall issues of one wing letting go early.   There have been some
who take the position that trim can used for increasing speed or lowering stall speeds, but that isn't at all what
Aeronca designed it for.    I suppose a degree of wash out isn't going to hurt anything, but I think Aeronca just
did it without any twist.   

Interesting that the IA thinks it has to be adjusted, even though he has no idea to what
spec!   Did you identify any wing heaviness?  Any sharp stall characteristics?  Did he use an
iphone or something to quickly check that both wings were equal?  Good enough.

Mark

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Date: Mon, 23 Mar 2015 14:34:21 -0400
From: coliem...@gmail.com
To: aer...@westmont.edu
Subject: Re: [f-AA] What is the washout angle for the Champ

[Rafael]

The different between the adjustment from the left to the right on my 38 its like 1 or two treads only visible after the  nut its in place

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From: Mark Peterson <mrpet...@msn.com>
To: "aer...@westmont.edu" <aer...@westmont.edu>
Sent: Monday, March 23, 2015 2:43 PM

[Sam Burke]

Mark

I did measure the difference in the twist angles between the wings using the wing root as a reference to measure the twist of the wing tips. The difference between the wings is 0.6 deg. I think the average twist was around 1.5 deg. The controlled stalls have been even with both wings stalling together. My new IA was with me during the measurements, he showed me where to place the iPhone running iHandy Level. I would prefer not to change things!

Sam & Pat Burke.  N6404C 1947 L16a

613 Aqueduct way

Solvang, 934693

805 686-2323 samburke@verizon,net

Www,samburke,org

Sent from my iPhone

[Sam Burke]

Mark

What do you mean by wing heaviness?

Sam Burke. N6404C 1947 L16a
Sent from my iPad

[James Beckman]

If I remember correctly, on my 65CA the wing rigging called out the angle of incidence at two rib locations. one being the root rib which can not be adjusted and another rib further out on the wing which was near the strut attach points. The angle of both points being the same which would mean zero wash-in/wash-out. It flys just fine as rigged and does not need any rudder or aileron trim. My A&P did the rigging but I did help. J Beckman 65ca 34585  
 

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From: samb...@verizon.net
Date: Mon, 23 Mar 2015 09:52:58 -0700
To: aer...@westmont.edu
CC: samb...@verizon.net

Subject: Re: [f-AA] What is the washout angle for the Champ

It appears that no one has adjusted their wing washout on a Champ!  I was told my my IA that it needed to be adjusted to be within spec, still looking for the spec. 

Regards,
Sam Burke N6404C  1947 L16A  C85-12  7BCM-296  USAF 47-1076

[John Rodkey]

This matches what Paul Agaliotis specified for my Chief:  no wash out.  0 degrees difference between tip and root angle.  Nada.

My Chief flies just fine, thank you very much...

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John (poobah) Rodkey - N9361E 11AC at Goleta

[Mark Peterson]

You have to hold either rudder or aileron to keep wings level, ball centered.


Sent from my iPhone

[Richard Murray]

Ask your IA what that spec is. I was under imressionthe washout was adjusted at the factory ant that is why we have fixed struts. Someone correct my misiformation please.

[Mark Peterson]

Dihedral is set by the fixed frt struts.  Wash in/out can be adjusted by the turns on rear strut as long as a wire hits the clevis bolt threads in the witness hole.   Usually three turns gives a result.

Sent from my iPhone

[Thomas Holmes]

7ac's don't have fixed struts.  The way I learned it (may or may not be correct) is that you make the rib closest to the strut attach point the same as the butt rib.  Then take whatever lift out of the "light" wing to fly hands off.

Tom​

[colie pitts]

You are correct Thomas!

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colie pitts