 The Yarará was developed by Nostromo Defensa under contracts from the US Southern Command with a system comprising three aircraft delivered in June 2006.Evolution of the design has seen an increase in the width of the undercarriage footprint to support rough field landings, while a Zenoah 6.5 hp engine is an option.The first powerplant is a Modellmotoren 3W 5.5 hp two stroke system.