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kearney(at)shaw.ca
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 Posted: Tue Dec 19, 2006 2:13 pm Post subject: Setting the elevator trim tab hinge |
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Hi
A local builder passed on his method for getting perfect alignment of the elevator trim tab when installing the piano hinge. Based on his instruction this is what I did:
· Cut a piece of thin aluminum stock into a template strip the same size as the hinge to be installed.
· Cleco clamped the template strip to the trim tab as if it was the hinge matching sure that the inboard side lined up with the trim tab
· Match drilled the template to the trim tab and clecoed every hole
· Fitted the trim tab with the template piece in place to the elevator setting up the alignment desired (a piece of angle aluminum made a great straight edge for alignment)
· Matched drilled a few holes on the elevator side of the template (roughly evenly spaced)
· Drew a rivet line on the trim tab side of the piano hinge and cleco clamped the template to it. Care was taken to ensure that the rivet line went through the center of each hole on the trim tab side of the template.
· Match drilled the piano hinge using the template. All the holes, including the few on the elevator side were drilled.
· The piano hinge was clecoed to the trim tab and the elevator and all remaining holes were match drilled.
At that pointed I riveted everything together. The end result is a trim tab trailing edge that exactly matches the trailing edge of the elevator. As well the outboard alignment is exact as well. I guess this method works so well because it eliminates using the piano hinge for whole alignment (there is a small bit of play in the hinge).
Attached are three of pictures.
- One shows the template installed (I had to redo it because I didn’t size it correctly so it doesn’t match the next photo). The template still has the blue vinyl sheath still on so it is quite visible where the hinge is to be installed.
- The next shows the alignment of the trim tab to the elevator after I had match drilled a couple of holes on the elevator side of the template. The angle aluminum at the bottom was used to set the alignment.
- The final photo shows the end result
Cheers
Les
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