VH-ZSE Colomban MC-15J Cri-Cri Jet (MSN SD2), owned by Isak Van Heerden, and flown by Bob Grimstead, at Sport Aircraft Builders Club (SABC) Annual Fly-In, Serpentine Airfield – 17 October 2021. The Cri-Cri is the smallest twin-engined, manned jet aircraft in the world, at 4.6 metres long, with a 5.3-metre wingspan. This one was converted from its previous two piston engines to use two Czech-built PBS TJ20A turbojets. Each engine weighs only 2.1kg and produces 20kg of thrust. At idle, the engine turns at 35,000 RPM and at max power, 120,000 RPM. The two engines together consume 1.3 Litres per minute. The engines have to be overhauled every 50 hours of operating time. Max speed is 120 knots and cruise is 100 knots, and range is 65 nautical miles. Photo © David Eyre.