New spar flap hinges

Tango Cub

GONE WEST

Duluth MN

• May 22, 2018

• #1

Hi I Have ran into a snag building my new super cub wings, I have installed new spars and false spars. The one wing has Univar spars the other wing has the Dakota Cubs spars, The aileron and flap hinge holes in the spars are approximately .100” lower than the other spar. They both have new Univar flap hinges. I have the aileron hinges set on the false spar and the ailerons line up with the wing. I have been trying to get the flaps to line up with the wing and ailerons. With the holes in the spa different, the hinges on the faults spar can not be adjusted far enough to where they need to be to for the flap to line up. Has anyone had this problem before? Any advice how to get them to line up. How much can they be off from the ailerons? Thanks Br

 

mike mcs repair

Registered User

chugiak AK

• May 22, 2018

• #2

Also, univar spars have the rear spar attach hole at a different height than original Piper spar. There is one stc that part of it is to BEND hangers to along them(pa-12 long flap install by day & night, now Aircraft Innovations)


Sent from my iPhone using SuperCub.Org

 

Tango Cub

GONE WEST

Duluth MN

• May 22, 2018

• #3

Is there a good way to bend the hanger to get it bent in the right place and not bend too much?

 

mike mcs repair

Registered User

chugiak AK

• May 22, 2018

• #4

Tango Cub said:

Is there a good way to bend the hanger to get it bent in the right place and not bend too much?

Click to expand...

lots of prayer, and a chunk of pipe or square tube over it.....

 

Steve Pierce

BENEFACTOR

Graham, TX

• May 23, 2018

• #5

I have built a lot of wings with Piper, Univair and Dakota Cub spars and never had an issue lining up the ailerons or flaps. With the hinge bolted to the spar I install the false spar and then the ailerons and flaps with a channel clamped to the bottom of the ribs to align the aileron and flap with the bottom of the wing and back drill the aileron and flap hinges to the false spar. Can you post some pictures? Pictures about a 1/4 of the way down this web album.
https://photos.app.goo.gl/ptQXfna4fZUmqRXl2

 

DW

Registered User

pacific northwest

• May 23, 2018

• #6

I lay the wings on a flat table bolt the hinge to the rear spar then lay the flap on the table and bolt to the hinge then back drill the hinge to the false spar.

 

Steve Pierce

BENEFACTOR

Graham, TX

• May 23, 2018

• #7

DW said:

I lay the wings on a flat table bolt the hinge to the rear spar then lay the flap on the table and bolt to the hinge then back drill the hinge to the false spar.

Click to expand...

What about the washout?

 

DW

Registered User

pacific northwest

• May 23, 2018

• #8

OK Pierce you got me just put that little wedge under the end of the wing we all know where it goes...

 

Steve Pierce

BENEFACTOR

Graham, TX

• May 23, 2018

• #9

I know, you build them flat.

 

coxcub

PATRON

Devon, England

• Jan 6, 2022

• #10

Folks

While doing a trial fit of the false spar and flap and aileron hinges I found that the inboard flap hinge hung at a different angle to that from the outboard one which prevented the inboard flap false spar from fitting - both were bolted securely and neither show any damage.

After some head scratching I put a line accross the trailing edge of the ribs to ascertain the difference - see photos.


Outboard Inboard

Has anybody come accross this before? - I presume the fix will be a new hinge.

Thanks all

Frank

 

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Steve Pierce

BENEFACTOR

Graham, TX

• Jan 6, 2022

• #11

I would remove the two flap hinges and compare them closely. Probably compressed or stretched at the end where the 5/16" bolt attaches to the spar.

 

coxcub

PATRON

Devon, England

• Jan 6, 2022

• #12

Thank you Steve - you got me looking in the right place - here's what I found

the good one


The bad one


the previous 'repairer?' must have left the bolt loose and tightened it after the false spar was installed until the hinge was jammed against it. I don't remember if it was loose when I took the wing apart. So a new one it is.

Frank

 

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LMartin

Lisa Martin

FRIEND

Coeur d'Alene, ID

• Jan 14, 2023

• #13

Thanks for the picture story! What do you use to attach the hanger to the false spar? They were mostly rivets when I drilled them out to clean the hangers, some screws/nuts. Your picture looks like either philips head screw or a cherry max.

 

Steve Pierce

BENEFACTOR

Graham, TX

• Jan 14, 2023

• #14

Soft A rivets.