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Magnum
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 Posted: Jan 27, 2006 - 02:03 AM
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Enthusiast
Joined: Jan 26, 2006
Posts: 75
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Guysmiley wrote:
Is the EPU needed because a Viper only has one engine? Other FBW jets (F-117, F-22) are twins and to the best of my knowledge don't have an EPU, they just have generators on each engine, right? So I wonder what they're doing with the JSF? I'm guessing it won't fly worth a crap without electrical power either...
That's absolutely true. The Main and STBY generators run off the engine as well as both hydraulic systems. Should the engine sh!t the bed, you would be left with no hydraulics to activate the control surfaces, not to mention the minor detail of having no way to tell the jet to move them because its an electric jet. No electric = no fly. The EPU supplies adequate electric power for normal operations and enough hydraulics to get home and land safely. I'm not sure what they're doing for the JSF. |
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Sponsor
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 Posted: Oct 07, 2008 - 12:24 PM
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asiatrails
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Posted: Jan 27, 2006 - 02:48 AM
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Forum Veteran
Joined: Aug 30, 2005
Posts: 706
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It is used in emergency systems because it is very effective at what it does, ignite quickly every time and produce a lot of energy.
Hydrazine is a mono-propellant (nitrogen / hydrogen mix) which will immediately ignite when placed in contact with any platinum group metal catalyst. It is exothermic, (burns rapidly), about 1700 degrees F and produces a lot of energy.
The mono-propellant properties save space, complexity, and weight.
It saves space because there is no need to carry up a separate oxidizer.
It saves weight and simplifies the system because there is only one set of plumbing and no ignition system. |
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Muscles10
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Posted: Mar 10, 2006 - 08:27 AM
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Enthusiast
Joined: Mar 10, 2006
Posts: 20
Location: Aviano
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Has an F-16 ever landed after running out of gas thanks to it's EPU? - Bealio
Come on Bealio...do the physics. Without thrust, the F-16 is a rock. With the size of the wings the jet would not remain airborne by gliding for very long. Not factoring wind, which is a HUGE variable, the F-16 would lose altitude at a rate higher than gaining distance (mathematically speaking). A good pilot could probably land successfully, but they would have to be close to the runway. I'm definitely not an expert, but I checked with an accomplished mathematics professor on this. |
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Happy_Gilmore
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Posted: Mar 10, 2006 - 09:31 AM
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Senior member
Joined: May 14, 2004
Posts: 253
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Quote:
Come on Bealio...do the physics. Without thrust, the F-16 is a rock. With the size of the wings the jet would not remain airborne by gliding for very long.
WRONG ANSWER Muscle10, the Viper has a HUGE glide ratio, 39 miles engine out is the record, I think from the Indiana ANG. Many an F-16 has glided to a successful landing with no engine and the EPU running. Check your facts before calling the Viper a rock, your way off base bro.
Happy. |
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asiatrails
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Posted: Mar 10, 2006 - 02:04 PM
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Forum Veteran
Joined: Aug 30, 2005
Posts: 706
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Happy_Gilmore wrote:
Quote:
Come on Bealio...do the physics. Without thrust, the F-16 is a rock. With the size of the wings the jet would not remain airborne by gliding for very long.
WRONG ANSWER Muscle10, the Viper has a HUGE glide ratio, 39 miles engine out is the record, I think from the Indiana ANG. Many an F-16 has glided to a successful landing with no engine and the EPU running. Check your facts before calling the Viper a rock, your way off base bro.
Happy.
I agree with Happy, take a look at this Code 1 link
http://www.codeonemagazine.com/archives ... index.html |
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bealio
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Posted: Mar 10, 2006 - 05:11 PM
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Active Member
Joined: May 06, 2004
Posts: 113
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| Come on Muscles10 a.k.a. Mrrrrrr, don't try to call people out on this site unless you are absolutely positive or you end up looking like a ...well, you know. Your mom is a rock. |
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MechFromHell
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Posted: Mar 11, 2006 - 12:19 AM
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Joined: Sep 22, 2005
Posts: 299
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asiatrails
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Posted: Mar 11, 2006 - 12:23 AM
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Forum Veteran
Joined: Aug 30, 2005
Posts: 706
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[quote="MechFromHell"]WoW...39 miles unpowered is quite a feat! Thanks for the info, didn
While talking about unplanned gliding events here is the Airbus version - when you read this remember that this is a total electric jet - with side stick controllers - at night - with passengers.
http://www.rvs.uni-bielefeld.de/publica ... ransat.pdf |
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MechFromHell
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Posted: Mar 11, 2006 - 01:12 AM
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Senior member
Joined: Sep 22, 2005
Posts: 299
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| Excellent read! Thanks asiatrails.. |
_________________
Crew Chief
Mountain Home AFB 2000-2005 ~ Acft 91-0370
Sheppard AFB 2005- NOW
www.myspace.com/mechfromhell
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