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according to this source and this video:
http://www.aerospaceweb.org/question/planes/q0123.shtml#b
http://www.YouTube.com/watch?v=4y_ePf1Jcr8
We have learned that the Harrier carries a certain amount of cooling water that is needed to prevent the Pegasus turbofan engine from overheating during hover. If operating conditions are such that the water is needed at the maximum cooling rate, there is only enough water available to remain in hover for about 90 seconds before the supply is exhausted. However, the aircraft rarely needs to use this cooling water at the maximum rate, and can therefore hover for considerably longer than 90 seconds. We're just not sure how long "considerably longer" is. We've observed the Harrier hovering at airshows for periods of time on the order of 5 minutes or more. Based on these numbers, our best guess is that the maximum time limit over which the Harrier can maintain hover is probably around 10 minutes or so.
the pegasus engine requires cooling while hovering (no air cooling available during hover) and uses coolant to achieve this so the amount of time it can hover is related to the amount of coolant available. This has never been scientifically measured but is estimated to be between 5-10 mins
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What was the first jet aircraft to hover?
The Harrier 'Jump-Jet.' Capable of taking off and landing vertically or normally.
How fast does a Harrier jet go?
The fastest can go up to 735 mph(depending on type of harrier), and the slowest it can do is a mere hover.
What three unique trick can a harrier jet do?
Take off vertically, land vertically, and hover in mid-air
Can jet engines be used to hover efficiently for flight like a helicopter?
Yes, though not as efficiently as a helicopter. The most notable example is the Harrier jet.
What can the airplane harrier do?
It is a fighter jet, with is most notable feature being is ability to take-off and land vertically, giving it the name "Jump jet".
What was the original name for the harrier aircraft?
The Harrier Jump Jet, formally referred to as the "Harrier" or informally as "the Jump Jet",
When was Harrier Jump Jet created?
Harrier Jump Jet was created in 1989.
Do jets or planes hover?
The only jet airplane that is capable of hovering is the harrier jet. The osprey tilt-rotor aircraft may also be considered an airplane by some standards, and is also capable of hovering.
What did the harrier jet do first?
The Harrier jet introduced the idea of VTOL (vertical take-off and landing).
When did Harrier Jump Jet - video game - happen?
Harrier Jump Jet - video game - happened in 1992.
When was Harrier Jump Jet - video game - created?
Harrier Jump Jet - video game - was created in 1992.
What can't a harrier jet do?
A Harrier can't break the sound barrier.
