Here you can download free plans for a foam rc plane.
OMP Hobby Bighorn 49 Inch Balsa RC Airplane PNP Maiden Flight
DFS Weihe RC Slope soaring
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Mig 21, Rafale, Paper Plane, Dolphin & Diamond DA42 Twin By Hi Tech xyz
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Full Carbon Esus Wing slope soaring over the Cornish Coastline
CARDBOAR DIY RC PLANE
Online calc of the CG of an RC airplane