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Rigging the wings


Michael Samson
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Joined: 2 years ago
Posts: 258
Topic starter  

 This is crazy. The angle of incidence at the root is 1 degree 52 min. The angle at the tip is 37 min on the right wing 38 minutes on the left wing. The root is fixed, the adjustment for the tip is the bottom of the rear strut. Who on earth could measure 1 minute?

 I leveled the inbd rib and moved the bubble to the line in the level for the tip of both wings. I doubt the plane will snap roll when I check the stall.


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Michael Samson
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Joined: 2 years ago
Posts: 258
Topic starter  

I had second thoughts about rigging wings the "old school" way so I bought a fancy inclinometer. It will be great for checking control surface travel but it was no better than using a level on fabric wings. The fabric surface is too uneven and has too much flex to get precise readings with an accurate meter. I checked everything over and over and neither strut was worth changing. 

 

This post was modified 10 months ago by Michael Samson

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lawheelock
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Joined: 16 years ago
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@ecos36gmail-com

The last outboard rib should give a pretty even, smooth base for your fancy inclinometer.  Better yet is the "smart level" that is a digital instrument reading in very small increments.  See the post on 180 hp Franklin.

 

Larry Wheelock

Larry Wheelock, A&P/IAStinson 108 N584LW 180 LycTexas in Winter; Indiana in Summer


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Michael Samson
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Joined: 2 years ago
Posts: 258
Topic starter  

 I have been dinking with the wing rigging for a month. Today all the angles were good. 38' is hard to measure consistently. A smart friend suggested that with the slot right there, all you need is some wash out, thus the small angle.


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lawheelock
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Joined: 16 years ago
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I found on 108s that even after setting all the correct angles, the final adjustments had to come after a flight test and make minor adjustments to get it to fly hands off.  Lots of variables on hand built airplanes.

Larry Wheelock

Larry Wheelock, A&P/IAStinson 108 N584LW 180 LycTexas in Winter; Indiana in Summer


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Michael Samson
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Joined: 2 years ago
Posts: 258
Topic starter  

@lawheelock You got that right.  This plane has had several major wing repairs too. I may have one of the long aileron push pull rods a 1/2 turn off cuz I don't think the control wheels are going to be level in flight.

 The plane does have the cool built in ground adjustable rudder trim feature


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