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Looks like the hinges mounting tabs were riveted to the false spar without mounting the control surface and insuring they were flush with the bottom of the wing. They probably mixed up the flap and or hinge original locations the last time it was disassembled. My son’s PA22/20 has the same frigg’n problem. None of the control surfaces are flush with the bottom of the wings. On his airplane I initially rigged the wings to the instruction memo. Insured the yoke was centered and adjusted the aileron trailing edges to neutral. Then adjusted the flap bell crank shat rod length to match the fuselage nub where the fairing wraps around the trailing edge. From there to remove the heavy wing I think I adjusted the rear strut on the heavy wing, shorter I think.. it’s been like 5 years since I re-rigged it. This summer we’re pulling the wings to recover and repair/correct the crapsmanship issues. Especially since the Stewart’s system top coat has completely peeled off the top side of both wings.
Piper didn't do a good job of aligning the hinges. I would get you control surfaces rigged trailing edges in line when an air load is simulated. then check your wing rigging. Check the outboard aileron bay rib with a digital level, each should be the same angle and the airplane will usually fly wings level with the ball centered. Have had to turn a rear strut for 1/2 a turn or so. After the wings are rigged then deal with the fin to get the ball to center without having to step on a rudder pedal.
Looks like the hinges mounting tabs were riveted to the false spar without mounting the control surface and insuring they were flush with the bottom of the wing. They probably mixed up the flap and or hinge original locations the last time it was disassembled. My son’s PA22/20 has the same frigg’n problem. None of the control surfaces are flush with the bottom of the wings. On his airplane I initially rigged the wings to the instruction memo. Insured the yoke was centered and adjusted the aileron trailing edges to neutral. Then adjusted the flap bell crank shat rod length to match the fuselage nub where the fairing wraps around the trailing edge. From there to remove the heavy wing I think I adjusted the rear strut on the heavy wing, shorter I think.. it’s been like 5 years since I re-rigged it. This summer we’re pulling the wings to recover and repair/correct the crapsmanship issues. Especially since the Stewart’s system top coat has completely peeled off the top side of both wings.
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I don’t want to hijack this thread, but do you know what caused the top coat to peal off? I painted my left wing last year with the Stewart system and I’m in the middle of painting the right wing.
I have droop tips so set the string to the top of Rib 13 that would be the end of the original wing configuration. Correct me if I'm wrong on that spot.
Measured
4" left
4 3/16 right
I think the plan of attack tonight will be get the struts set correctly then use the Piper Rigging paper by Frank Rush to correct the control surfaces. Thank you Sean for digging up that paper
I don’t want to hijack this thread, but do you know what caused the top coat to peal off? I painted my left wing last year with the Stewart system and I’m in the middle of painting the right wing.
Juergen
Pacer N3342Z
A guy rebuilt the airplane, wrecked on the first flight, another guy bought it. Did the engine…poorly..painted it with paint purchased from the last owner. Somewhere along the path it was covered with polyfiber through silver…then topped with Stewarts system..there isn’t any evidence of the silver having been scuffed to give Stewart’s something to grab ahold of. And it was tied down outside in Anchor Point Alaska for three years.
apparently i should not do work in the evenings. Reset the string yesterday afternoon and got measurements that are close to the SM-20 procedure left wing is only off 0.3 degrees compared to the right with a digital level for washout.
Locked the yokes to level and adjusted the ailerons.
Right leveled out good
Left it appears there is some warping on the outboard so half split the difference.
Test flight this morning left wing is less heavy or fixed and ball ls slight left i cant tell if its just yaw or the wing at this point.
Removed the abomination that is the rudder trim tab someone decided to put on that was set to the right will test fly this evening and see how it behaves.
-verified the wing rigging
-Set the ailerons and got the yoke set neutral
Flight #1 about 10 degrees left bank and about 1/4 left ball
Reduced left wing rear strut 1 turn and removed old trim tab.
Flight #2 3/4 of ball left wings staying level. Landed and adjusted rudder leading edge a few times could not get better than 1/2 ball left.
Flight #3 Reinstalled old trim tab now fly hands off with slight ball right.
Looks like i am on the right track just some final fine tuning left to go.
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PA-22/20 rigging issues
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Originally Posted by mmoyle
