The pages about the Royal South African Airforce are still incomplete but there is one design that might fit your needs:
AeroDynamics RBW-9B "Dragonfly" (alias Heinkel He 59)
The Dragonfly is designed as a long range recce plane to controll shipping and fishing in the Empires own and adjacent waters. With her crew of four (Pilot, Navigator/Bombardier and two Engineer/Gunner) she can remain on patrol for eight hours. During such long flights her armament is generally limited to four 125kg bombs under her wings and her three machineguns. If used as a strike aircraft against hostile shipping her bombload can be increased to a total of 600kg or a torpedo under her fuselage. The increased bombload comes at a cost of some range but enables the RBW-9B to deal out lethal blows. In a second role the large floatplane is used for rescue mission for which it remains unarmed. In 1928 an order of 40 planes for four squadrons and four trainers was placed.
A RBW-9B at her base
This Dragonfly is used for unarmed rescue mission
Line drawings of the AD RBW-9B
First Flight: 28.6.1927
Type: Long range reconnaissance plane and bomber
Power: 2x 650PS 12-cyl.-engine (inline)
Crew: 4
Vmax: 235km/h
Vcruise: 170km/h
Range: 1200km or up to 8h on patrol
Weapons: 600kg bombs or 1 torpedo, 3 7,62mm MG