Modern airtanker belly tanks are complex pieces of engineering, with eight compartments on the Electras of Air Spray and Buffalo Airways. This view with fairings removed, looking forward, shows the control mechanisms for the even-numbered rear four compartments.

Another 'jet prop' with an interesting history, that is quite well documented on AirHistory. This one was delivered to TEAL in New Zealand in 1959. She had a number of US and Canadian operators from 1972 onwards, including Reeve Aleutian Airways. Undergoing continued work here on the conversion into airtanker. The paint scheme on the fuselage is still mostly following the Reeve livery but with different colours.

Formerly N2RK, this Electra would eventually go over to Air Spray for conversion to air tanker and is now operating in the Buffalo Airways fleet as Tanker 416

This Electra was converted to air tanker by Air Spray and is seen here awaiting flight testing.

Buffalo's first Electra firebomber, but with its belly tank removed. It would be another couple of years before the aircraft was certified by Canadian authorities.