Search found 823 matches

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by wingscrubber
Sat Apr 27, 2013 11:42 pm
Forum: Non-Aviation
Topic: Global Warming, Is It Really Man-Made?
Replies: 101
Views: 6638

RE: Global Warming, Is It Really Man-Made?

The anthropogenic global warming theory is just a modern-day pascals wager. It's proponents believe that there's too much to lose by not believing in it, and as such treat non-believers as heretics. Any debate or challenge to the 'science' results in childish bickering between those who have already...

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by wingscrubber
Thu Apr 18, 2013 8:36 am
Forum: Technical/Operations
Topic: Russian To American Part Detective Work!
Replies: 3
Views: 4962

RE: Russian To American Part Detective Work!

Type of aircraft? Actuator type, length and stroke?
Would love to help, but need information first...

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by wingscrubber
Tue Apr 16, 2013 1:09 pm
Forum: Technical/Operations
Topic: Which Skydrol Types Are Used On Most Airliners?
Replies: 20
Views: 14954

RE: Which Skydrol Types Are Used On Most Airliners?

Acceptable fluids are usually dictated by the maintenance manual, however in some instances Skydrol 500B, LD4, HD4 and V are intermiscible, so are the red oils MIL-5606, 83282 and 87257. 500B is now obsolete for new design, 5606 ought to be too but Dassault still insists on using it. Everything else...

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by wingscrubber
Fri Apr 12, 2013 9:47 am
Forum: Technical/Operations
Topic: Open Rotor Engines - The Future?
Replies: 11
Views: 11964

RE: Open Rotor Engines - The Future?

The concept of bridging the gap between a traditional turbofan, and a contra-rotating twin-prop turbofan is a viable one, as it seeks to find the sweet-spot between max fuel efficiency and highest economical cruise speed. Combining technologies such as gear-reduction and variable pitch blades could ...

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by wingscrubber
Mon Mar 18, 2013 1:44 pm
Forum: Technical/Operations
Topic: Nose Wheel Shimmy
Replies: 20
Views: 17446

RE: Nose Wheel Shimmy

There's not always a single cause of nosewheel shimmy, it can be a combination of things. I used to work on a business jet which suffered from it badly, the 'shimmy checklist' went something like this: -Check tyre pressures -Check nosewheel steering accumulator pressure -Check oleo strut pressure -C...

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by wingscrubber
Fri Mar 15, 2013 5:49 am
Forum: Non-Aviation
Topic: USA Tips Needed
Replies: 81
Views: 3645

RE: USA Tips Needed

If you go to Alabama be sure to visit the USS Alabama museum in Mobile, and the Stennis Space Center near Slidell in Mississippi, those are about the most interesting things I remember in those states, they're near the gulf coast though so if you're in the north of the state only don't bother. But i...

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by wingscrubber
Fri Mar 15, 2013 5:30 am
Forum: Technical/Operations
Topic: Can Helicopters Suspend Trucks That Were Inside?
Replies: 1
Views: 3806

RE: Can Helicopters Suspend Trucks That Were Inside?

Care to scan and upload the picture to imgur or photobucket so we can see what you're talking about? Every Piasecki/Vertol/Chinook/Sea Knight underslung load pictures I've ever seen are done from the mid-point C of G, unloading a vehicle from a rear ramp to a sling in flight... well that would resul...

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by wingscrubber
Wed Feb 06, 2013 9:21 pm
Forum: Technical/Operations
Topic: TF42, Our Engine Project For The Airliners-200
Replies: 84
Views: 20733

RE: TF42, Our Engine Project For The Airliners-200

This might be a little risky in terms of R&D, but I would like to propose my unconventional twin-core contra-rotating ducted dual fan engine concept...  <img src="http://cdn-www.airliners.net/aviation-forums/graphics/smilies/smile.gif" width="15" height="15" border="0"/><a href="http://i32....

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by wingscrubber
Sat Feb 02, 2013 8:22 pm
Forum: Military Aviation & Space Flight
Topic: Qaher-313 Iranian Stealth Fighter
Replies: 79
Views: 20006

RE: Qaher-313 Iranian Stealth Fighter

Flight global thinks its using the <acronym title="Trans Asia Airways (Taiwan)">GE</acronym> J85 powerplant, which if non after burning puts it in league with a small subsonic western jet trainer level of performance, but if they've given it the afterburning version from the F5, it might achieve sup...

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by wingscrubber
Mon Jan 21, 2013 7:39 pm
Forum: Technical/Operations
Topic: Hyd Fluid And Fuel Contamination
Replies: 14
Views: 7006

RE: Hyd Fluid And Fuel Contamination

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/HAWK21M" class="quote" target="_blank">HAWK21M</a> (<a href="#7" class="quote">Reply 7</a>):<br/><i>Why do they state 5%, what about a leaking l...

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by wingscrubber
Mon Jan 21, 2013 7:24 pm
Forum: Technical/Operations
Topic: Hydraulic Fluid And The 757
Replies: 18
Views: 10191

RE: Hydraulic Fluid And The 757

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/Jeffry747" class="quote" target="_blank">Jeffry747</a> (<a href="#0" class="quote">Thread starter</a>):<br/><i>D) Why is hydraulic fluid so darn...

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by wingscrubber
Mon Jan 21, 2013 6:54 pm
Forum: Technical/Operations
Topic: Hyd Fluid And Fuel Contamination
Replies: 14
Views: 7006

RE: Hyd Fluid And Fuel Contamination

I think fuel in the hydraulic fluid is more of a problem than hydraulic fluid in the fuel, but the latter is probably more common, although there are contamination tolerances for both fluids. FAQ from the skydrol website says: Q: What happens when fuel is contaminated by hydraulic fluid? A: In labor...

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by wingscrubber
Wed Dec 26, 2012 5:40 am
Forum: Technical/Operations
Topic: Parking Brakes On Airliners
Replies: 42
Views: 16889

RE: Parking Brakes On Airliners

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/titanmiller" class="quote" target="_blank">titanmiller</a> (<a href="#19" class="quote">Reply 19</a>):<br/><i>How long does it take the hydrauli...

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by wingscrubber
Mon Dec 03, 2012 6:55 pm
Forum: Technical/Operations
Topic: Experts On A Tech Forum.
Replies: 21
Views: 9156

RE: Experts On A Tech Forum.

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/CM" class="quote" target="_blank">CM</a> (<a href="#7" class="quote">Reply 7</a>):<br/><i>As we see daily on A.net, all of us have biases of one...

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by wingscrubber
Sat Nov 17, 2012 4:54 am
Forum: Technical/Operations
Topic: Directional Airflow Ducting Instead Of THS?
Replies: 15
Views: 3834

RE: Directional Airflow Ducting Instead Of THS?

Faro, sounds like you're describing a 'puffer' reaction jet system, this has already been implemented on VTOL aircraft, but generally has no useful applications otherwise. Notable exceptions though, include the NOTAR ducted tailbooms, used in place of the tail rotor, and the maneuvering thrusters us...

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by wingscrubber
Mon Nov 05, 2012 10:09 pm
Forum: Military Aviation & Space Flight
Topic: EE Lightning Recruiting Video
Replies: 9
Views: 5999

RE: EE Lightning Recruiting Video

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/Newark727" class="quote" target="_blank">Newark727</a> (<a href="#1" class="quote">Reply 1</a>):<br/><i>o wonder Britain got it's ass kicked in ...

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by wingscrubber
Thu Oct 25, 2012 8:18 pm
Forum: Technical/Operations
Topic: Flight Balance With One Wing Lost.
Replies: 27
Views: 5705

RE: Flight Balance With One Wing Lost.

If a wing seperates, the remaining wing will have no opposing moment on the opposite side of the airplane, so it will roll up and over the top...

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by wingscrubber
Thu Oct 25, 2012 7:57 pm
Forum: Technical/Operations
Topic: Project Tailhook
Replies: 18
Views: 4934

RE: Project Tailhook

Analysis paralysis is a good summary actually. It does seem simple in principal to just go design and build a tailhook, or any other aircraft component for that matter, but the way modern aircraft programs are run, it's very easy to get bogged down in beuracracy which slows any real 'work' to a craw...

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by wingscrubber
Thu Sep 27, 2012 9:49 pm
Forum: Non-Aviation
Topic: Metric Or Imperial?
Replies: 155
Views: 10364

RE: Metric Or Imperial?

Water is also a useful reference point for the metric system, where 1 cubic metre of water = 1000 litres, weighing 1000kg, so 1L of water = 1kg. The celsius system of temperature was also originally based on 100th increments between freezing point and boiling point. Problem is these references only ...

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by wingscrubber
Wed Sep 26, 2012 3:58 pm
Forum: Technical/Operations
Topic: Aircraft Handling During Manual Reversion
Replies: 7
Views: 9525

RE: Aircraft Handling During Manual Reversion

I remember talking to a pilot who suffered a total hydraulic failure on a manual-reversion aircraft I used to support (Non-FBW), he simply described it as being 'very difficult'. I imagine the pulsations occur because continuous deflection requires extra exertion from the pilot, it's just physically...

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by wingscrubber
Fri Sep 21, 2012 8:11 pm
Forum: Technical/Operations
Topic: Drag, Glide Speed, Spiral Dive And Flap
Replies: 6
Views: 7314

RE: Drag, Glide Speed, Spiral Dive And Flap

1. The indicated airspeed for maximum L/D ratio is the speed for minimum drag and is very important because it is also the best glide speed (i.e., the speed for maximum gliding distance) If best glide speed is the max L/D ratio, is this only happen on gliding but not cruising? <a href="http://www.no...

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by wingscrubber
Sun Sep 16, 2012 2:39 am
Forum: Technical/Operations
Topic: Engine Failure After Take-off
Replies: 12
Views: 7069

RE: Engine Failure After Take-off

Rule #1, fly the airplane. Radio calls and restart attempts are secondary. Best tactic is to immediately trim for best glide if you've lost your only engine, or trim for a shallow(er) climb if you have 1 or more engines remaining. Some twins might not be able to climb on a single engine at all if th...

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by wingscrubber
Fri Sep 07, 2012 6:47 pm
Forum: Technical/Operations
Topic: Will We See Jet Donkeys Soon?
Replies: 22
Views: 9153

RE: Will We See Jet Donkeys Soon?

I don't think the term 'jet donkey' will catch on! How about 'runway shuttle', or 'aircraft acceleration carraige' ?  <img src="http://cdn-www.airliners.net/aviation-forums/graphics/smilies/smile.gif" width="15" height="15" border="0"/> I think usage of something along the lines of aircraft car...

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by wingscrubber
Wed Sep 05, 2012 5:36 am
Forum: Technical/Operations
Topic: It's Official: I'm Looking For A Used B747
Replies: 45
Views: 12305

RE: It's Official: I'm Looking For A Used B747

Sounds like a terrible business proposition to me, but here's a Jumbo for sale; <a href="http://www.controller.com/listingsdetail/aircraft-for-sale/BOEING-747-200/1986-BOEING-747-200/1241661.htm?" target="_blank">http://www.controller.com/listingsde...0/1986-BOEING-747-200/1241661.htm?</a> Some folk...

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by wingscrubber
Mon Aug 27, 2012 11:49 pm
Forum: Technical/Operations
Topic: Uneven Reverser Deployment, Is It Normal?
Replies: 9
Views: 5272

RE: Uneven Reverser Deployment, Is It Normal?

Yep #3 reverser seems to deploy a couple of seconds before #1, with #2 out of camera shot. My theory: either the reversers were manually activated out of sequence (most likely) or, because each thrust reverser is powered by a separate hydraulic system, if engine RPM was higher on engine #3, it would...

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by wingscrubber
Mon Aug 27, 2012 11:34 pm
Forum: Technical/Operations
Topic: Long-haul Biz Jets
Replies: 15
Views: 5954

RE: Long-haul Biz Jets

Drat. Link not showing up and cannot edit previous post. Here's the table from the article I was trying to link:

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by wingscrubber
Mon Aug 27, 2012 11:25 pm
Forum: Technical/Operations
Topic: Long-haul Biz Jets
Replies: 15
Views: 5954

RE: Long-haul Biz Jets

The Falcon 7X is up there too.

Here's a good article on long-range bizjets:
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by wingscrubber
Sun Aug 19, 2012 6:54 pm
Forum: Technical/Operations
Topic: Plane Design: Would This Be Feasible?
Replies: 13
Views: 6770

RE: Plane Design: Would This Be Feasible?

The flaw with any 'sonic cruiser' concept is that it puts you on the steepest gradiant of the Mach drag curve, why not accelerate over the hump and supercruise? You could achieve the same fuel burn with greater speed - and there are savings associated with shorter mission time. Otherwise there's no ...

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by wingscrubber
Wed Aug 15, 2012 5:07 pm
Forum: Technical/Operations
Topic: Engine De-rate
Replies: 2
Views: 5887

RE: Engine De-rate

I found some goodies for you, take a look; Rolls Royce on derating: <a href="http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=17&ved=0CE0QFjAGOAo&url=http%3A%2F%2Fwww.smartcockpit.com%2Fdownload.php%3Fpath%3Ddocs%2F%26file%3DDerated_Climb_Performance...

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by wingscrubber
Mon Aug 13, 2012 6:13 am
Forum: Technical/Operations
Topic: Subsonic And Transonic
Replies: 8
Views: 8181

RE: Subsonic And Transonic

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/tdscanuck" class="quote" target="_blank">tdscanuck</a> (<a href="#5" class="quote">Reply 5</a>):<br/><i>They don't actually require it, it just ...

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by wingscrubber
Fri Aug 10, 2012 5:09 pm
Forum: Technical/Operations
Topic: Could An A380 Glide?
Replies: 36
Views: 30830

RE: Could An A380 Glide?

Related thread: <i><a href="/aviation-forums/general_aviation/read.main/1929892" target="_blank">Could An A380 Glide After Loss Of All Engine Power</a></i> <font size="1">(by <a href="/profile/Bcal" class="quote" target="_blank">Bcal</a> Jan 28 2005 in Civil Aviation)</font> Here, somebody estimates...

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by wingscrubber
Thu Aug 09, 2012 5:58 pm
Forum: Technical/Operations
Topic: Subsonic And Transonic
Replies: 8
Views: 8181

RE: Subsonic And Transonic

Arzouni, be sure to include a section on Whitcomb Area rule - this becomes very important at high subsonic/transonic speeds.
Also, be sure to research variable-geometry air-intakes for the engines, all supersonic jets require this, either by a moveable cone or ramp that allows the engine to breathe.

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by wingscrubber
Wed Aug 01, 2012 10:48 pm
Forum: Technical/Operations
Topic: Concorde With Today's Technology?
Replies: 68
Views: 11843

RE: Concorde With Today's Technology?

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/Starlionblue" class="quote" target="_blank">Starlionblue</a> (<a href="#38" class="quote">Reply 38</a>):<br/><i>Of course you are correct. Perha...

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by wingscrubber
Thu Jun 28, 2012 8:23 pm
Forum: Technical/Operations
Topic: Old A380 Catia Problem Review Attempt
Replies: 6
Views: 9591

RE: Old A380 Catia Problem Review Attempt

This seems to be a good article about what you're describing. <a href="http://www.cadalyst.com/cad/product-design/what-grounded-airbus-a380-10903" target="_blank">http://www.cadalyst.com/cad/product-...gn/what-grounded-airbus-a380-10903</a> Every Catia-savy engineer I know has spoken ill of the V4 t...

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by wingscrubber
Thu Jun 14, 2012 6:09 am
Forum: Technical/Operations
Topic: How Much Do Commercial Pilots Actually Pilot?
Replies: 45
Views: 22649

RE: How Much Do Commercial Pilots Actually Pilot?

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/azjubilee" class="quote" target="_blank">azjubilee</a> (<a href="#4" class="quote">Reply 4</a>):<br/><i>The simple answer is: ALWAYS. A pilot is...

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by wingscrubber
Tue May 29, 2012 6:14 am
Forum: Technical/Operations
Topic: How Dangerous Is Skydrol
Replies: 38
Views: 44677

RE: How Dangerous Is Skydrol

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/tdscanuck" class="quote" target="_blank">tdscanuck</a> (<a href="#30" class="quote">Reply 30</a>):<br/><i>It would be very difficult to get a lo...

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by wingscrubber
Sun May 27, 2012 7:41 am
Forum: Technical/Operations
Topic: How Dangerous Is Skydrol
Replies: 38
Views: 44677

RE: How Dangerous Is Skydrol

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/DocLightning" class="quote" target="_blank">DocLightning</a> (<a href="#11" class="quote">Reply 11</a>):<br/><i>I really wonder why a silicone-b...

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by wingscrubber
Mon May 14, 2012 5:53 am
Forum: Technical/Operations
Topic: How To Change An A320 Wheel (video)
Replies: 3
Views: 6703

How To Change An A320 Wheel (video)

I know there are many who frequent this forum who actually do this for a living, but some of us have to pretend vicariously by way of youtube that they know how to change a tyre on an airliner... <a href="http://www.youtube.com/watch?v=RSrTX1Oi2hc&feature=g-vrec" target="_blank">http://www.youtu...

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by wingscrubber
Mon May 14, 2012 5:51 am
Forum: Technical/Operations
Topic: How Dangerous Is Skydrol
Replies: 38
Views: 44677

RE: How Dangerous Is Skydrol

I have made my feelings known about skydrol in previous threads, no need to repeat them  <img src="http://cdn-www.airliners.net/aviation-forums/graphics/smilies/smile.gif" width="15" height="15" border="0"/><i><a href="/aviation-forums/tech_ops/read.main/295708" target="_blank">Why Is Hydraulic...

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by wingscrubber
Sun May 06, 2012 11:04 pm
Forum: Technical/Operations
Topic: How Much Thrust Do T/R's Make?
Replies: 25
Views: 8089

RE: How Much Thrust Do T/R's Make?

Regarding clamshell/bucket reversers, those terms seem to be used interchangeably, but they are technically distinct types: <a href="http://engineering.purdue.edu/~propulsi/propulsion/jets/basics/bigpic/thrustreverse1.html" target="_blank">http://engineering.purdue.edu/~propu.../basics/bigpic/thrust...

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by wingscrubber
Sun May 06, 2012 10:27 pm
Forum: Technical/Operations
Topic: Differential Braking
Replies: 21
Views: 6395

RE: Differential Braking

Further to my previous comment; addressing brake failures, generally this is addressed by failsafe design of the hydraulic system on a transport category airplane. You typically have at least two different hydraulic systems powering a given brake, so one system will be powering every other caliper p...

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by wingscrubber
Sun May 06, 2012 10:06 pm
Forum: Technical/Operations
Topic: Differential Braking
Replies: 21
Views: 6395

RE: Differential Braking

Differential braking does seem a little out of place on some of the bigger aircraft with nosewheel steering, steerable bogies etc, but it has always been a method of steering assistance even on some of the very earliest airplanes. On some smaller types, differential braking is your only means of gro...

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by wingscrubber
Tue Apr 24, 2012 6:17 am
Forum: Technical/Operations
Topic: PTU Failure
Replies: 11
Views: 6588

RE: PTU Failure

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/lke2fly" class="quote" target="_blank">lke2fly</a> (<a href="#9" class="quote">Reply 9</a>):<br/><i>so let me get this if the EDP fails in fligh...

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by wingscrubber
Sun Apr 22, 2012 10:00 pm
Forum: Technical/Operations
Topic: PTU Failure
Replies: 11
Views: 6588

RE: PTU Failure

There is no automatic activation or activation valve for a PTU - it's a pressure balanced component, and will start turning when one system has higher pressure than the other. This is why you sometimes hear the 'barking dog' when ground running in an A320. I Suspect there was an EDP failure in one s...

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by wingscrubber
Tue Apr 10, 2012 8:56 pm
Forum: Technical/Operations
Topic: Question On Engine Fire?
Replies: 16
Views: 4614

Question On Engine Fire?

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/longhauler" class="quote" target="_blank">longhauler</a> (<a href="#7" class="quote">Reply 7</a>):<br/><i>That is why, when pulling an "engine f...

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by wingscrubber
Wed Apr 04, 2012 8:34 pm
Forum: Technical/Operations
Topic: Supersonic Human Transportation
Replies: 61
Views: 12004

RE: Supersonic Human Transportation

<a href="http://www.aviationweek.com/aw/generic/story_channel.jsp?channel=busav&id=news/avd/2012/04/02/08.xml&headline=NASA%20Claims%20Supersonic%20Breakthrough%20For%20Biz%20Jets" target="_blank">http://www.aviationweek.com/aw/gener...%20Breakthrough%20For%20Biz%20Jets</a> Feeling somewhat ...

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by wingscrubber
Mon Apr 02, 2012 8:57 pm
Forum: Technical/Operations
Topic: Supersonic Human Transportation
Replies: 61
Views: 12004

RE: Supersonic Human Transportation

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/tdscanuck" class="quote" target="_blank">tdscanuck</a> (<a href="#27" class="quote">Reply 27</a>):<br/><i>Drag = Cd * 1/2 * rho * V^2 * A. That'...

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by wingscrubber
Mon Mar 26, 2012 7:02 pm
Forum: Technical/Operations
Topic: Supersonic Human Transportation
Replies: 61
Views: 12004

RE: Supersonic Human Transportation

This article has some good profitability analysis, at a high level, comparing the Boeing 747 against Concorde. <a href="http://thetravelinsider.info/2003/0411.htm" target="_blank">http://thetravelinsider.info/2003/0411.htm</a> Looking at fuel costs alone, yes it's easy to see that there's a penalty ...

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by wingscrubber
Fri Mar 23, 2012 6:27 pm
Forum: Technical/Operations
Topic: Supersonic Human Transportation
Replies: 61
Views: 12004

RE: Supersonic Human Transportation

Here's a good article speaking in a similar vain to my own opinions:
http://www.forbes.com/sites/wheelsup...ll-not-privately-flying-at-mach-3/

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by wingscrubber
Mon Mar 19, 2012 8:01 pm
Forum: Technical/Operations
Topic: CRJ Hydraulic Pump Deferral
Replies: 22
Views: 5480

RE: CRJ Hydraulic Pump Deferral

http://www.smartcockpit.com/pdf/plan...r/CRJ-100-200-SERIES/systems/0015/

Smartcockpit has some good material describing the CRJ hydraulic system.

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