These are pix of the building of my Cavazos Sailplane Design Slope Scale F-20. This was my first Slope Scale plane but will not be my last. I really enjoyed building it. The ship turned out well and I learned a lot about building as well as finishing. I may do a few things different on the next one (a CSD P-51B) but, mostly, I am happy with how it turned out.
Special thanks to Dave Garwood for answering several questions. His experience made my job easier!
The first thing I did was to sheet the wings. I vacuum bagged them with epoxy and a layer of 1.7 glass in between the 1/16 balsa skin and the core for good epoxy adhesion.
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The vertical stab was reinforced with basswood leading and trailing edges then sanded to an airfoil shape.
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Same idea on the horizontal stab.
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After I glued on the basswood leading edge and shaped it and glued the balsa sub trailing edge on, I installed the torqe rod setup.
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I beveled the aileron leading edge to shape.
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I made these brass bushings for the ailerons to receive the torque rods.
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The holes in the foam cores are just there to help hold epoxy in.
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A Slope Scale plane can’t be too strong so I added a layer of this 4.8 ounce or so Kevlar/Carbon material from the wing saddle forward. I used laminating epoxy and it worked well.
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Here is the vertical stab being mounted. Make sure it is straight!
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The horizontal stab is ready to mount. You do have an incidence meter, don’t you? I covered the stab, as well as the wings and vertical stab with an iron covering called Lite-Fab, just like Solartex. It was very easy to work and went around the curves easily. It also takes primer very well.
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It is starting to look like an F-20!
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Here, the aileron push rods have been installed prior to gluing the wing on. I tried the aileron servo in the wing. Don’t do that if you are going to glue the wing on. Access to the servo in case of a problem would be tough. I put the aileron servo just forward of the wing in the fuse.
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Primed and almost ready for paint.
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I used West Systems fairing filler and epoxy for the fillet. Bondo probably works as well or better.
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My buddy, Steve, did the main tiger scheme.
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Some of Steve’s other art!
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Top view
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Bottom view
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Radio installation
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I still have to do the weathering thing to the plane but it has already been out several times. I takes a pretty good wind to make this puppy happy but it is a blast in good lift. Finished weight is about 45 ounces.
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