 However, as the limitations of the simple rotary wing became clear, teams started looking for other solutions and many turned to using jet engines directly for vertical thrust.SNECMA (now Safran Aircraft Engines) developed a series of such systems as part of the SNECMA Atar Volant series during the 1950s.To further improve the design, SNECMA had Nord Aviation built an annular wing and adapted it to the last of the Volant series to produce the SNECMA Coléoptère.