Pa12 lift strut measurement

[AClarke]

Anyone know the Pa12 lift strut length? Installing new wings with “original” sealed struts and they bind at the fuselage strut attach point on frame with the attach fork adjusted all the way in. Need to determine if these are -12 or -18 length struts. Side loading the attach fork makes me nervous...
Any ideas?

Adam

 

[mike mcs repair]

18 front struts have cable fairlead attach rings on upper part(and is LONGER), -12 does not... unless Airframes Inc. goofed up again.. (but they assured me the fixed their jig so that won't happen again )

 

[AClarke]

Seems like the Clevis end angle isn’t quite right on any of the 4. Logs indicate correct Univair P/N’s

Natural “lay” of the struts is about 4-5 inches below the wing attach fitting. Not a lot of force required for alignment but made me wonder if the angle or length was wrong.

Adam

 

[skywagon8a]

....Natural “lay” of the struts is about 4-5 inches below the wing attach fitting. Not a lot of force required for alignment but made me wonder if the angle or length was wrong.

Are you trying to put too much dihedral in the wings? OR has your fuselage been rebuilt with the wing strut fitting being bent at the wrong angle?

 

[AClarke]

Clevis ends are all the way in so no on the excess dihedral. Will take a look at things this morning.

 

[cruiser]

Front 120 3/4”. Rear 121 1/2”. To center of bolt holes measured on front side of hole.

 

[AClarke]

Cool, thanks a lot. Will check Mine. Adam

 

[AClarke]

Had to clean the rear mounting lug and the strut fits much better now.
Anyone have experience of -18 jury strut set up on a -12? In particular the front strut mount fitting/clamp. Best to cut the cablenfairlead lug of an -18 fitting or is there another front clamp off a different PA series that will work?

Rather not make one from scratch...

Adam

 

[mike mcs repair]

Had to clean the rear mounting lug and the strut fits much better now.
Anyone have experience of -18 jury strut set up on a -12? In particular the front strut mount fitting/clamp. Best to cut the cablenfairlead lug of an -18 fitting or is there another front clamp off a different PA series that will work?

Rather not make one from scratch...

Adam

Depending on who’s struts you have they sell clamps without that fairlead on them.


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[AClarke]

Thks Mike. I’ll makes some call tomorrow.

Adam

 

[salmonriverbob]

Front 120 3/4”. Rear 121 1/2”. To center of bolt holes measured on front side of hole.

you give the measurements but where do you start the measure from?
plus measure to the center of bolt at the upper end?
would

 

[mike mcs repair]

you give the measurements but where do you start the measure from?
plus measure to the center of bolt at the upper end?
would

He states it clearly there..


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[Victor L. Olsen]

I have a PA-12 here with all 4 lift struts with the univair stamp on the flat spot at the wing attach. Both right struts have 5/8 forks, both left struts have 7/16 forks.? The 2011 annual shows compliance with AD 99-01-05 by punch test. The 2013 annual replaced the aft aft rt strut with U85553-102 and fork with 14481-02 then states that all struts have been replaced with new PMA struts. Are 7/16 forks OK on a PA-12?

 

[Steve Pierce]

The only thing I have seen with smaller forks is the J3.