PA18project
Registered User
Missoula MT
In laying out my spar blanks for drilling I ran into a discrepancy between the piper drawings and the piper spars I have as patterns.
The Piper Drawings show that the third hole (from the bottom of the spar) for the strut attach fittings for both front and rear spars should be 121.25 inches from the end of the spar (wing attach side). The piper drawings for the front and rear spars are 14388 and 14453 respectively.
The PA-18 front spar I have has the third hold (from the bottom of the spar) at a distance of 123.5 inches. The rear spar has its third hole for the strut attach (again from the bottom of the spar) at a distance of 122.25 inches.
Both of the spar patterns I have came from the same PA-18 (unknown horsepower or year). Before I do any drilling I want to be sure about where things should be. Any help would be appreciated. Thanks.
Brad
The Piper Drawings show that the third hole (from the bottom of the spar) for the strut attach fittings for both front and rear spars should be 121.25 inches from the end of the spar (wing attach side). The piper drawings for the front and rear spars are 14388 and 14453 respectively.
The PA-18 front spar I have has the third hold (from the bottom of the spar) at a distance of 123.5 inches. The rear spar has its third hole for the strut attach (again from the bottom of the spar) at a distance of 122.25 inches.
Both of the spar patterns I have came from the same PA-18 (unknown horsepower or year). Before I do any drilling I want to be sure about where things should be. Any help would be appreciated. Thanks.
Brad