Securing & Riveting The Wing Ribs
Poly Fiber System
It is necessary to secure the fabric to the wing ribs. In this procedure, we hope to demonstrate the proper way of doing this.
It is advised to obtain the Poly Fiber booklet for theier asking price of $10.00 before proceeding with any covering of painting. Their book, "How To Cover An Aircraft Using the Poly-Fiber System" is available at Poly Fiber's web site, PolyFiber.com, or from a Poly Fiber dealership.
Items you will need to complete this job are: 3/8" wide reinforcing tape. This is a fiber tape that was sent with your kit. Surface tape, Dacron 2" Pinked, available from Aircraft Spruce and other suppliers. An inexpensive soldering iron. Rivet gun, a pneumatic rivet gun will help a lot. Small 2" paint brush to apply the glue. And a pair of scissors. |
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The builder of these wings applied the first brush coat of Poly Brush to the entire wing fabric prior to adding the rib tape and rivets. Poly Brush leaves a pinkish color to your fabric. Before applying the reinforcing tape to the ribs, use MEK to reactivate the Poly Tak glue on the ribs below the fabric, working it up into the fabric. |
After the second coat of Poly Brush has been applied, remove the masking tape. You are now ready to move on to applying the reinforcing tape. |
NOTE: The rivets for the ribs have much larger heads at 3/8" width than the standard rivets at 1/4". You may also need to use a 1/8" drill bit to clean out the holes prior to inserting the rivets. You are now ready to insert the rib rivets and rivet them down. |
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When you get to the trailing spar, measure and cut off the excess tape so it ends at the center, front of the spar prior to gluing it down. After finishing gluing each finishing tape, the builder used a little MEK on a rag to clean up the excess Poly Brush along the tape edge. |
Now you will want to apply the finishing tape to the front and rear spars. When applying the finishing tape, it will cover and lock in the finishing tape ends you just applied to the ribs.
Use the same gluing method to glue down the spar finishing tape as you used with the rib finishing tape. |
If you have not already installed the ailerons onto the wing's trailing spar, then this would be a good time to do so. We will be adding a hinge area gap enclosure using the 2 inch straight Dacron tape. |
Work in about 12 inch sections, laying down the 2 inch tape until you reach the second hinge. Now, do the same on the aileron spar, adhering the Dacron tape to the aileron. This will make what will look like a gutter between the wing and aileron. As an end result, the tape applied between the wing and aileron will help reduce trailing wing turbulence. This area ABSOLUTELY MUST BE SEALED to avoid aileron flutter. |
SPECIAL NOTE: For those of you who feel you may need to remove the ailerons for any reason in the future, you may wish to consider applying this seal after your paint job is finished. In this case, it has been suggested to use 2 inch, 3-M super clear packing tape as it's thicker than standard packing tape and holds up for a long time. This way, if you ever need to remove the ailerons, just remove the packing tape. CAUTION: One problem that has been encountered when using a "removable" tape is the tape may also remove paint as it is peeled off. This situation can be avoided by allowing the paint to cure for a couple of weeks before applying the tape. Otherwise, with the permanent solution above, you will need to cut the Dacron tape in half to remove the ailerons. |