Skinning the inner wing sections

Finally time to skin the inner wing sections. They have to be skinned before mounting the landing gear, or there will be no room to pull lots of the rivets. I also need to get get it on it's feet so I can sit in it and make cool sounds :-)

First I fastened the "Tygon" pitot and static pressure tubes. Just stripped them on to the electric wire lines. I have never heard of Tygon tubing before, so I googled it:

Clear, Phthalate-Free Tubing
Tygon S3™ B-44-3 tubing is specially formulated for transferring a wide variety of beverages including soft drinks, fruit juices, flavored teas and bottled water. In virtually all cases, Tygon S3™ B-44-3 tubing will not affect the taste or odor of products transferred through it, while its excellent non-wetting properties facilitate complete drainage and permit simple flush-cleaning.

The glass-like clarity of Tygon S3™ B-44-3 beverage transfer tubing allows the user to see product flow through it, so visual monitoring of flow is easy. This is particularly helpful in controlling or adjusting flow during processing.

Features And Benefit

• Clear as glass for easy visual monitoring of flow

• Lightweight and flexible for easy, quick installation

• Broad chemical resistance

• Non-wetting properties allow easy cleaning and complete drainage

• Contains no BPA or phthalates

Aha, so that makes it good for pitot and static pressure tubing? Lightweight and flexible is good. Chemical resistance is also good I guess. Non-wetting properties is probably very good. Any water condensate will not stick to the walls, and therefore easily drain and evaporate, I guess.

Then I took some last pictures before putting the skin on (already drilled and countersunk)

Then I saw I had forgotten to prime the mating face under the doubler, so primed that and started riveting on the skin.

Updrilling inner wing skin

Started updrilling the inner wing skin to 1/8. I use drill #31 on all flush SS rivets, and #30 on all non-flush SS rivets and all solid rivets (as I have used everywhere else). After having laid on my back on the concrete floor, I decided to purchase one of those car mechanic "on the back" chair/bed. But then I remembered I had some old garden chairs laying around...

Inner wing skin

Finished match drilling the inner wing skin on both sides. I had help from my son, impossible to do for one person. Now it's updrilling to 1/8, dimple and de-burring etc.

Inner wing skin

With the outer wing in place and "lasered" up and the inner wing skin on, I match drilled all holes on the main spar and aft along the ribs. Then removed the outer wing, insert the skin doubler to finish the rest.

Inner wing ribs and skin

Bolted/riveted on the inner wing ribs and started trimming the inner wing skins. The inner wing ribs was finished from some time ago.Lots of crashes rivets vs bolts and similar. I need to make several new holes on the trailing edge. Also the wing bolt handle clip needs to be shifted further outward and further in. This will require a piece of skin doubler.

To get room to drill and rivet, the landing gear has to be removed. Luckily I have the AirWard removable wind shield kit, or this would be a real PITA.