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Do you mean like a mazda rotary or an airplane type rotary with the pistons around in a circle?
If it's got pistons, it's not a rotary. Pistons in a 'circle' would be a radial engine, usually with an odd number of cylinders.
They did make rotary (Wankel) aircraft engines a while back. I remember seeing them on the web, I just can't remember where.
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXPVE3&P=7