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F1 Mod – Horizontal Stabilizer Skin Stiffeners

July 17, 2017 by admin Leave a Comment

Tonight I’m starting on another F1 Mod to the Horizontal Stabilizer. This mod calls for adding skin stiffener angles to the upper and lower skin surfaces between the rib bays – 2 per bay, both on the upper and lower surfaces. See the diagram below.

I began by marking lines of the HS skins where the stiffeners will be located. As I wanted to line up the stiffeners with existing rivets, I wasn’t able to get the stiffeners to per perfectly in line with the same plane as the main and tip ribs. Therefore you will see that they are slanted inward a little.

The stiffeners are made from 0.040″, 2024-T3 aluminum. I cut the pieces to size, so that there is a little space between the stiffener edges and the forward and rear spars.

After the stiffeners were cut to size, I used fluting pliers to get the stiffeners to match the curvature of the HS. In the picture below, you can also see that I marked the edge distance on the front and aft end of the stiffeners. I center punch these ends and pilot drill the stiffeners. Once pilot drilled, then I line the stiffener up on the lines previously marked on the inner skin surface. When I get the stiffener centered on the line, I then match drill the stiffener to the HS skin.

Here the stiffener is match drilled to the skin. Also, due to interference with the rear spar outer hinge doubler, I have the outer stiffeners facing towards the tip to provide clearance for the hinge doubler.

Next I removed the skin stiffener and with the rivet fan, spaced the rivet holes on the stiffener to match the existing rivet holes in the HS skin.

Here is a picture with the stiffeners all match drilled to the HS skin.

Amongst all the drilling on the stiffeners, I also finished drilling the spar to tip rib stiffener angles to their final 1/8″ dimensions.

Please comment, I love to hear from my readers.  Thanks again for coming along for this ride, you make my work worthwhile.

Filed Under: Empennage, Horizontal Stabilizer Tagged With: Empennage, Horizontal Stabilizer, Mods, Stiffener

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