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Subject: F-35B finally hovers!
jessmo_24    3/17/2010 5:52:17 PM
Let the adventure begin: (text from above URL) "STOVL F-35B Hovers for First Time Posted by Graham Warwick at 3/17/2010 11:46 AM CDT This just in from NAS Patuxent River - the first STOVL F-35 Joint Strike Fighter, aircraft BF-1, completed its first hover today (March 17). With the lift system engaged, the aircraft slowed from 150 kt to zero airspeed and hovered at 150ft for 2 minutes, moving up and down and left and right to check hover control. BF-1 then continued to to a short landing. A successful hover clears the way for the F-35's first vertical landing." http://www.aviationweek.com/aw/blogs/defense/index.jsp?plckController=Blog&plckScript=blogScript&plckElementId=blogDest&plckBlogPage=BlogViewPost&plckPostId=Blog%3A27ec4a53-dcc8-42d0-bd3a-01329aef79a7Post%3A3d82d757-8ad1-40ee-8d12-f815c1ae1535
 
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Phaid       3/17/2010 7:03:21 PM
They already did a SRVL landing the other day
 

Not a purely vertical landing, but since this is supposed to be the primary way the F-35B lands on carriers it was an important milestone.
 
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mabie       3/17/2010 10:08:26 PM
How long can the F-35B hover? With the Harrier, it can only do so for a limited period of time.
 
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StobieWan       3/18/2010 4:01:53 AM
From the above, at least two minutes, which is better than the Harrier (which was limited by the amount of demineralised water it carried for water injection - about 90 seconds.)

I think the F35 can do the deed in dry thrust and is therefore limited by the on board fuel and any temperature limitations placed on the engine and internal components while running at near full power with no air flow.
 
Ian

 
How long can the F-35B hover? With the Harrier, it can only do so for a limited period of time.

 
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jessmo_24       3/18/2010 6:19:11 AM
 
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Reactive       3/18/2010 1:09:01 PM
Ye gods, what a plane.
 
 
I genuinely and truly believe that this plane, whether delayed or not, will rule the skies.
 
 
It is a truly beautiful piece of engineering...



 
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jessmo_24       3/18/2010 1:43:23 PM
A few more points
 
* There was a short take off the very same day with less than 1k feet of runway
* Notice that the weapons bays are opened during hover someone mentioned thst this is to somehow affect airflow
and that they act like the strakes on the harrier
 
 
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jessmo_24       3/18/2010 5:53:09 PM

Let the adventure begin: (text from above URL)

"STOVL F-35B Hovers for First Time Posted by Graham Warwick at 3/17/2010 11:46 AM CDT

This just in from NAS Patuxent River - the first STOVL F-35 Joint Strike Fighter, aircraft BF-1, completed its first hover today (March 17).

With the lift system engaged, the aircraft slowed from 150 kt to zero airspeed and hovered at 150ft for 2 minutes, moving up and down and left and right to check hover control. BF-1 then continued to to a short landing.

A successful hover clears the way for the F-35's first vertical landing."
link
Update we got our 1st hover
 
is there a way to edit update a thread this board seems out of date!

 
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mabie       3/19/2010 8:29:33 AM

From the above, at least two minutes, which is better than the Harrier (which was limited by the amount of demineralised water it carried for water injection - about 90 seconds.)




I think the F35 can do the deed in dry thrust and is therefore limited by the on board fuel and any temperature limitations placed on the engine and internal components while running at near full power with no air flow.

 

Ian




 

How long can the F-35B hover? With the Harrier, it can only do so for a limited period of time.


Thanks, you may be right.. maybe fuel supply will be the limiting factor.




 
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Phaid       3/19/2010 10:36:37 AM
I think the F35 can do the deed in dry thrust and is therefore limited by the on board fuel and any temperature limitations placed on the engine and internal components while running at near full power with no air flow.

It can.  The Harriers with older engines used water injection for cooling the turbine, which allowed for more fuel burn and thus more thrust (newer Harriers with newer engines do not use water injection).  The F135's turbine can handle much higher core temperatures and thus has no need of such a system.
 
As far as cooling other components, the F-35 has heat exchangers in the inlet ducts which cool the fuel which itself acts as a cooling system for the rest of the jet.  The issue the F-35 has with heat is that if it is idling on the tarmac in high ambient temperatures, the heat exchangers are doing very little since not much air is going through the engines.  However, in a hover, the engines are generating 41,000+ lbs of thrust and there is plenty of air going through the inlets, so no problem there.
 
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Phaid       3/19/2010 10:37:23 AM
The upshot being, the F-35B's hover time is limited only by its fuel supply.
 
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