Poly Fiber Heavy Fabric

[acroeric]

Just a heads up about something I have recently learned while covering a Pitts wing. The heavy weight poly fiber fabric shrinks less in length than it does in width. On an airplane like a S2-C this is not a big issue as you can get the fabric pretty tight before you even shrink it. On an airplane like a S1-C it does become an issue as the ribs are a little farther apart and the ribs on the top are taller in proportion to the spar. Basically- as the heavy fabric shrinks more across it's width (as placed on the roll) than it does in the same given length it causes the fabric to scallop excessively between the ribs. On my wing when measured at it's deepest scallop it was 3/4".
Just something to keep in mind if you are covering using heavy weight poly fiber fabric.

 

[kjkimball]

 

[acroeric]

 

[kjkimball]

 

[jstreat]

 

[planebuilder]

 

[acropilotbret]

 

[jstreat]