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Scratch Built Waco UPF-7 by biplane guy. Viewed 620 times. Build Thread Next Prev Click image to return. Image Comments biplane guy 17-Aug-21 19:37 Lower wing biplane guy 17-Aug-21 19:44 I think I'm finally ready to cover. Ailerons work from the stick. bobgood 17-Aug-21 20:53 Wonderful work there - what plans are you using? Looking very professional! biplane guy 18-Aug-21 13:55 Hey, Bob. The plans I used were by Jerry Behrens Plans. They were scaled for a much larger RC model than I wanted to build. A good example is the wheel size. The plans call for 6" diameter wheels and the size I'm using is only 1-3/4" diameter. I had a local reprographics company scale the plans to fit the Continental R670 engine from the Guillows PT-17 kit as the WACO UPF-7 uses the same engine. Lots of adjustments were made to allow for the working controls but the plans gave me an accurate starting point. Please sign in to comment on this image.