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Smithsguy
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 Posted: Aug 05, 2007 - 04:02 PM
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Joined: Mar 08, 2005
Posts: 47
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Sponsor
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 Posted: Aug 29, 2008 - 7:58 PM
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Driver
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Posted: Aug 05, 2007 - 04:40 PM
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Joined: Mar 13, 2005
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| Also lookd more like the X-35B then the F-35B. Anyway too many special effects... (yes there can be too many and thus make it crapy) |
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PhillyGuy
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Posted: Aug 05, 2007 - 07:55 PM
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Joined: Mar 29, 2006
Posts: 177
Location: Philadelphia
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| Can the F-35B even fly forward while simultaneously hovering a few feet of the ground? |
_________________
"Man will never be free until the last king is strangled with the entrails of the last priest."
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Raptor_claw
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Posted: Aug 05, 2007 - 09:22 PM
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PhillyGuy wrote:
Can the F-35B even fly forward while simultaneously hovering a few feet of the ground?
Of course. It can also fly left or right, or backward while in hover.... |
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Driver
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Posted: Aug 05, 2007 - 10:24 PM
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Raptor_claw wrote:
PhillyGuy wrote:
Can the F-35B even fly forward while simultaneously hovering a few feet of the ground?
Of course. It can also fly left or right, or backward while in hover....
Just not that low. |
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VPRGUY
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Posted: Aug 05, 2007 - 11:31 PM
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Joined: Mar 24, 2005
Posts: 841
Location: Crestview, Florida
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| It can move forward, back, and side-to-side two feet off the ground if the pilot so chooses. There isn't some "magical" altitude at which they say "ok, we're at XX feet, so its only straight down from here". They have to be able to have that ability to fine-tune the parking/landing position of the aircraft. |
_________________
Remember that a lone amateur built the Ark. A large group of professionals built the Titanic.
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mcashe
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Posted: Aug 05, 2007 - 11:50 PM
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| wow. and i thought the movie true lies was corny when the governator straddled a hovering harrier. i would think that x35b would make that street a little unbearable for the people in the area with the heat that engine is putting out. cooling system not withstanding |
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donk14N
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Posted: Aug 06, 2007 - 01:16 AM
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Joined: Mar 06, 2006
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I was really looking forward to this movie (loving the prior three), until I saw what looked like Bruno jumping off the horizontal stabilizer of the JSF at the end of the preview. For shame.  |
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Shonuff
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Posted: Aug 06, 2007 - 05:47 AM
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Joined: Mar 10, 2005
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| awww.... the bastards blew it up... |
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nzenthusiast
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Posted: Aug 06, 2007 - 11:35 AM
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Joined: Mar 13, 2005
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| Well its good PR (public relations) even if its usage is unrealistic (the best case of PR was top gun in my opinion) |
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Driver
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Posted: Aug 06, 2007 - 08:02 PM
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VPRGUY wrote:
It can move forward, back, and side-to-side two feet off the ground if the pilot so chooses. There isn't some "magical" altitude at which they say "ok, we're at XX feet, so its only straight down from here". They have to be able to have that ability to fine-tune the parking/landing position of the aircraft.
I wonder for the simple reason: For a JSF to go forward during hover, it would need to put it's nose down to get speed due to the fact that the engine is facing down. Because of gravity that means the jet will go nose down into the ground so the only way a JSF could do that is by either by having enough power comming out of the engines to compensate meaning it would gradually rise or by removing all friction. #1 is a no can do since th jet is under a bridge #2 is a no can do becuase simply we can't. |
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Raptor_claw
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Posted: Aug 06, 2007 - 08:32 PM
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Driver wrote:
... For a JSF to go forward during hover, it would need to put it's nose down to get speed due to the fact that the engine is facing down. Because of gravity that means the jet will go nose down into the ground
Hovering is not flying (more accurately, it's not conventional 'wingborne' flight).
It's a completely different set of mechanics than 'normal' flight, where you might lower your nose (to reduce drag and/or altitude) to increase speed.
In the hover mode, all the forces on the aircraft (other than gravity) are provided by thrust (jet, lift fan, and roll post). To move forward from a pure hover, the net thrust vector is 'repointed' so that it's not purely straight down, but has a forward component. This is accomplished via changes to the deflection angles of the nozzle and the lift fan vanes, and use of the roll posts, as needed. |
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sprstdlyscottsmn
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Posted: Aug 07, 2007 - 09:41 PM
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Joined: Mar 10, 2006
Posts: 342
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| thats true, the lift fan vane especially has a wide(relatively) range of motion allowing for a certain degree of velocity shift with no attitude change. |
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dwightlooi
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Posted: Aug 07, 2007 - 11:05 PM
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Joined: Mar 02, 2006
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| The F-35B in hover mode can move up, down, left, right, forward, backwards, as well as rotate left and right. Thats the basic degree of freedom needed to land the darn thing on an LHA/LHD. Even though vertical flight is typical used only for landing, the F-35 can also take off vertically if asked to do so. The problem is that doing so doesn't allow for much payload. The maximum total hover thrust is about 17.9 tons. The F-35B weighs about 14.5 tons, so that leaves about 3.4 tons (~7,500 lbs) for payload. That is enough for half a tank of gas (6.4/2 = 3.2 tons) or maybe 1/3 the fuel load, 2 x 1000 pounders and a pair of AMRAAMs. For the same reasons, the harrier typically do not take off vertically either because it wouldn't be able to carry much if it did so. |
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asiatrails
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Posted: Aug 08, 2007 - 06:42 AM
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Joined: Mar 30, 2005
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dwightlooi wrote:
The F-35B in hover mode can move up, down, left, right, forward, backwards, as well as rotate left and right. Thats the basic degree of freedom needed to land the darn thing on an LHA/LHD. Even though vertical flight is typical used only for landing, the F-35 can also take off vertically if asked to do so. The problem is that doing so doesn't allow for much payload. The maximum total hover thrust is about 17.9 tons. The F-35B weighs about 14.5 tons, so that leaves about 3.4 tons (~7,500 lbs) for payload. That is enough for half a tank of gas (6.4/2 = 3.2 tons) or maybe 1/3 the fuel load, 2 x 1000 pounders and a pair of AMRAAMs. For the same reasons, the harrier typically do not take off vertically either because it wouldn't be able to carry much if it did so.
Pretty well correct, this is why everyone, except the USMC has ski jumps on their ships.
During the flight test program of the AV8B we cleared the Harrier envelope to -20 Kts in the hover and demonstrated (inadvertently) in excess of -35 Kts. The biggest issue with the Harrier is the hot day bring back capability; you do not want to dump a high $$ store just because you are too heavy to come aboard. |
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