I have to agree with Dennis, Just the way it pivots perfecly like it was tied to something should tell you that. I will tell you the lift for that aircraft comes from a huge fan in the center of its belly not the exhaust nozzle. We make the drive shaft for this Joint Strike Fighter JSF here where I work. It is about 5 feet long and 10in in dia. Titanium center tube to reduce weight. Still not in full production, with the cost of this plane and the Govt spending the orders were really reduced. The non vert lift model is kewl also.