Washout

[MWflyer]

How important to have the full 2-1/2 degrees washout in the wings ?

 

[Steve Pierce]

Suppose to make the airplane more stabile and more docile stall characteristics. Clyde Smith told me they flattened one out and it didn't make mush difference.

 

[Stephen]

Eliminating some washout should make the plane less stable and theoretically increase cruise speed and improve glide.

 

[Gilbert Pierce]

Let us know how that works out.:smile:

 

[N2709P]

Are you standard category or experimental?

 

[PACERGUY]

Still lots of cold and snow in Alaska so I will stir the pot a bit. Just for clarification and a good baseline where does it say you need 21/2 degrees of washout in the wing? Is the measured from the center of the fuselage to the tip of the wing? Has anyone compared the level/wood block method and rechecked with a smart level. What if you square the wing and push the aileron out to the end where would you measure from? The PA 18 washout is measured form the middle of the fuselage to the tip of the wing. So from inboard rib to outer aileron rib you end up with 2 degree washout. You will lower stall speed with less washout but may loose the very benign nature of a Pacer stall. I suspect most Pacers have been rigged with too much washout but really don't know.
DENNY

 

[MWflyer]

We had a new used set of Univair struts installed and it still flys left wing heavy after adjusting the left rear strut shorter twice and the IA is thinking do it some more, I think that is flattening the wing isn’t it , not sure the difference of wash out or wash in

 

[Gilbert Pierce]

Washout and dihedral affect different flying qualities. Wash causes the wing to stall inboard first and makes for a more predictable stall.
Dihedral makes the aircraft more stable. In turbulence the dihedral helps to return the wing to level.
In theory less wash out more lift and more speed.
The only place dihedral and washout are mentioned is in the rigging instructions. It is not in the. TCDS.

 

[Jim]

Hi,

I think I'm suffering from hi-way fatigue and misunderstood.

 

[MWflyer]

I think I better start over and try to get it right. As always thanks for the help.