June 27, 2014
Posted by: The Brickmuppet at
09:01 AM
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Post contains 99 words, total size 1 kb.
He sure came down hard, though not hard enough to seriously damage the airframe, I guess.
My bet is that he was running out of water. Harriers only carry enough water to run in hover mode for 90 seconds, and it looks like he was pushing the limit.
But your point is well taken, too. That thing is a deliberate design and standard deck equipment? Yikes!
Posted by: Steven Den Beste at Fri Jun 27 14:59:31 2014 (+rSRq)
Posted by: Siergen at Fri Jun 27 16:59:39 2014 (8/vFI)
Posted by: jon spencer at Fri Jun 27 19:24:23 2014 (JSYPT)
Wait, what? Can you explain, Steven?
Posted by: Wonderduck at Fri Jun 27 23:49:10 2014 (DiS7r)
When they are hovering, there are gizmos that vector thrust from the engine straight down. But the engines don't produce enough thrust normally to hold the jet up. So they overdrive the engines by injecting water.
It's the same principle as water injection in WWII piston engine fighters. The water cools the air flow, which permits more air and more fuel to pass through the jet engine, producing more thrust. But they have to use a lot of water to get that effect, and they don't carry all that much because water is heavy.
It turns out that they carry enough for 90 seconds of hover. (And too bad for Arnold in True Lies.)
Posted by: Steven Den Beste at Sat Jun 28 00:36:09 2014 (+rSRq)
The maximum take-off thrust available from the Pegasus engine is limited, particularly at the higher ambient temperatures, by the turbine blade temperature. As this temperature cannot reliably be measured, the operating limits are determined by jet pipe temperature. To enable the engine speed and hence thrust to be increased for take-off, water is sprayed into the combustion chamber and turbine to keep the blade temperature down to an acceptable level.Water for the injection system is contained in a tank located between the bifurcated section of the rear (hot) exhaust duct. The tank contains up to 500lb (227kg, 50 imperial gallons) of distilled water. Water flow rate for the required turbine temperature reduction is approximately 35gpm (imperial gallons per minute) for a maximum duration of approximately 90 seconds. The quantity of water carried is sufficient for and appropriate to the particular operational role of the aircraft.
Posted by: Steven Den Beste at Sat Jun 28 00:41:36 2014 (+rSRq)
Posted by: Steven Den Beste at Sat Jun 28 00:43:01 2014 (+rSRq)
Posted by: Siergen at Sat Jun 28 08:57:30 2014 (8/vFI)
Posted by: Steven Den Beste at Sat Jun 28 09:15:41 2014 (+rSRq)
Posted by: Mauser at Sun Jun 29 01:21:08 2014 (TJ7ih)
Posted by: Pixy Misa at Sun Jun 29 04:24:52 2014 (PiXy!)
Posted by: Mitch H. at Mon Jun 30 15:36:29 2014 (jwKxK)
Posted by: Pete Zaitcev at Mon Jun 30 20:26:06 2014 (RqRa5)
Posted by: The Brickmuppet at Mon Jun 30 21:19:53 2014 (DnAJl)
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