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FS2002/FS2004 Fournier RF4-D Motorglider. The RF4 is an aerobatic version of the RF3. A few prototypes were built in France and 155 RF4-D (c/n 4004 to 4158) were built in Germany by Sportavia. There are about 15 in the U.S.A. By Kazunori Ito.