Posted by Texasmark1 on June 13, 2015 at 17:41:18 from (184.63.170.149):
In Reply to: Nice jet posted by Ultradog MN on June 12, 2015 at 18:18:09:
Well there is a thing referred to as "thrust to weight ratio" that has to be considered for sustained vertical flight, which this wasn't. Taking the F-16 single engine "hot dog" US built fighter jet, the loaded weight (undefined as to just the ac or with ordinance) per Wikipedia is 26.5k# whereas the thrust with the burner lit is 28.6k lb/force. So it exceeds the ratio and qualifies, as does the F-15 to name a couple of oldies and I have seen well publicized photos of both events.
I ran the Wikipedia numbers on the Dreamliner 787-8 and she is overweight by exactly 2x and doesn't qualify. What everybody is seeing I think is just a stunt where the momentum of the aircraft at "rotate" velocity....velocity where the pilot sucks on the stick was enough to propel the aircraft vertical for a brief minute, which, on the KC-135A was 176 Knots (203 mph). Dreamliner in that configuration was probably much higher than that, and they could have delayed the liftoff for more speed to accomplish their stunt, again, a stellar achievement, but isn't that what air shows are all about....dazzle your potential customers? Course I'm at a loss as to who is the customer here and who was piloting the stunt aircraft.
What's missing from the video of a gorgeous aircraft with the Boeing Flex wing like the B-52 whose tip flexes 18' from parked to WOT airborne, is the side view allowing you to determine the rate at which the velocity of the aircraft decreases as it uses up the energy of the takeoff. But it was a most unusual stunt. Amazing how time changes things....Vietnamese commercial jet built in the USA by the same guys that built the US B-52s that bombed that country big time, refueled by theUS KC-135 tankers that gassed them up built by the same company.
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