Moki Motoren makes small size radial engines for UAV aircraft and large scale models. With five cylinders it has three models available:

-The S-215, the S-250 and the S-400.

“Moki S-215”

“Moki S-250 running”

-The above photograph belongs to a Moki S-250 installed on a small plane, spinning smooth and without vibrations.

-The photograph comes from a YouTube video.

“Moki S-400”

From Appendix 11: On their website they advertise a few more engines:

-The 5-cylinder radials S-180, S-300 and the 7-cylinders of 250cc and 350cc.

-The four-stroke, twin-cylinder 100BVT boxer.

-The 50 VT, a four-stroke, single-cylinder.

-And four single-cylinder, 2-stroke engines, 75cc, 45cc, 30cc and 20cc for smaller models.