Сверхзвуковой S-21G - совместная разработка российского ОКБ П.О.Сухого и американской фирмы "Гольфстрим Аэроспейс"

A three-view drawing of one version of the Gulfstream-Sukhoi SSBJ (supersonic businessjet), with three engines. Power plant development is to be a joint effort by Rolls-Royce and the Lyulka design bureau, and may allow the SSBJ to evolve as a twin-engined design.