SF 25 B	Engine	max. Take off	Specialty	Issue	Rev.
	Stamo	555 kg		Feb. 1972	7
	Sauer 1800	555 kg		Nov. 1992	0
SF 25 C	Engine	max. Take off	Specialty	Issue	Rev.
	Limbach 1700	580 kg		Mar. 1972	12
	Limbach 1700	580 kg	spring mounted bull gear	May 1975	11
	Limbach 1700	610 kg		Okt. 1978	2
	Limbach 1700	650 kg		Oct. 1983	4
	Limbach 2000	650 kg	pitch 75 (propeller)	Nov. 1983	4
	Limbach 2000	580 kg	pitch 90 (propeller)	July 1990	1
	Limbach 2000	610 kg	pitch 90 (propeller)	June 1990	3
	Limbach 2000	650 kg	pitch 90 (propeller)	May 1990	1
	Rotax 912	all MTOW		Mar. 1997	9
	Rotax 914	690 kg		Apr. 2013	0
SF 25 E	Engine	max. Take off	Specialty	Issue	Rev.
	Limbach 1700	650 kg		June 1975	4
	Limbach 2000	650 kg		Jan. 1990	4

Bergfalke	Type	Specialty	Rev.
	BF II/55	only operating instruction
	BF III		5
	BF IV		7
Zugvogel	Type	Specialty	Rev.
	Zugvogel III B		1
SF 26	Type	Specialty	Rev.
	SF 26 A		6