The Sukhoi Su-29 is a Russian two-seat aerobatic aircraft with a 268 kW (360 hp) radial engine. It was designed based on the Su-26 and inherited most of the design and technical features of its predecessor. Due to wide use of composite materials, which make up as much as 60% of the Su-29's aircraft structure, the empty weight is increased by only 50 kg (110 lb) over the single-seat Su-26's empty weight.