Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The FVA-4 Pipo was a biplane two-seat powered trainer designed and built in Germany in 1923. After the relative success of the first three designs, the next aircraft to emerge from the FVA workshops was a biplane two-seater intended solely for ab initio training with new students at the FVA. Built to be easily maintained and repaired, the FVA-4 Pipo, (named after Wolfgang Klemperer's sister, “Pipo”), was a strut braced biplane constructed with wood covered with fabric. After the FVA-4 and the FVA-5 Rheinland (built simultaneously) were completed,Wolfgang Klemperer emigrated to the USA.

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