Search found 45 matches

by Grunf
Wed Jun 25, 2014 11:05 am
Forum: Technical/Operations
Topic: Yaw Damper Failure
Replies: 37
Views: 10953

RE: Yaw Damper Failure

I'm surprised no one posted a link to this video. It's a couple of Dutch (aeronautic?) students riding along on Cessna 550 and test switching YD on/off. Switching it off leads to rather pronounced Dutch roll (sic): <a href="http://www.youtube.com/watch?v=4Xk4PuYRujM" target="_blank">http://www.youtu...

Jump to post
by Grunf
Mon Jun 09, 2014 3:53 pm
Forum: Civil Aviation
Topic: AN-2 Crash In Russia (with Footage)
Replies: 20
Views: 18620

RE: AN-2 Crash In Russia (with Footage)

Tragic.

I flew An-2 on few occasions and I felt it's the safest plane you could possibly fly. Stall speed was so low you could almost step out of it running...

Jump to post
by Grunf
Thu Aug 29, 2013 7:39 pm
Forum: Technical/Operations
Topic: Radiation Exposure On Flights
Replies: 24
Views: 6813

RE: Radiation Exposure On Flights

I've talked to a researcher who did extensive tests re this issue. Conclusion: pilots do have higher probability of suffering skin cancer. On their hands. Due to playing golf. I kid you not.

Jump to post
by Grunf
Tue Jul 26, 2011 5:01 pm
Forum: Military Aviation & Space Flight
Topic: C-130 Crashed In Morocco
Replies: 14
Views: 7284

RE: C-130 Crashed In Morocco

it seems to be CFIT during bad weather. What has age to do with it?

Jump to post
by Grunf
Thu Apr 03, 2008 2:26 pm
Forum: Technical/Operations
Topic: Lyulka AL-7 - Is This True?
Replies: 16
Views: 8741

RE: Lyulka AL-7 - Is This True?

Hmm...Wiki says so but I wonder in such case what Su-9 intake cone does? I find it weird if supersonic flow survives the cone and duct ride into the engine. Can it be the typo? Maybe the compressor tips themselves were supersonic?

Jump to post
by Grunf
Tue Feb 19, 2008 11:10 am
Forum: Technical/Operations
Topic: B787 Was No Bleed Air A Good Idea?
Replies: 164
Views: 41049

RE: B787 Was No Bleed Air A Good Idea?

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Hel...

Jump to post
by Grunf
Fri Feb 01, 2008 3:50 pm
Forum: Technical/Operations
Topic: 41,000 Feet -- Will There Be A Higher Standard?
Replies: 61
Views: 12784

RE: 41,000 Feet -- Will There Be A Higher Standard?

Speaking about Concorde, I would like to know what would Concorde's theoretical absolute ceiling be, right below coffin corner?

Something like flying over tropics, nearing the end of cruise (=light) and approaching intersection between Vne and stall speed?

Jump to post
by Grunf
Sun Nov 25, 2007 1:39 pm
Forum: Civil Aviation
Topic: How Is The A380 Doing So Far With Singapore?
Replies: 23
Views: 14710

RE: How Is The A380 Doing So Far With Singapore?

How is engine reliability? IFE is still working? Overheads bins retracting? No pieces falling off? Any child-diseases? Servers still online? One would expect that these first examples would have their share of bugs, having the wiring reworked and all but first compercial A380 seems to work quite wel...

Jump to post
by Grunf
Fri Nov 09, 2007 12:26 pm
Forum: Technical/Operations
Topic: Tire Smoke On Landing
Replies: 32
Views: 10996

RE: Tire Smoke On Landing

How about small vanes that pop out of wheel and turn the wheel by airstream for pre-spin? It doesn't have to be 100%. Frankly, you could have a small servo that pulls out the vanes as far as needed until tyres spin at groundspeed?

Jump to post
by Grunf
Fri Nov 09, 2007 12:18 pm
Forum: Technical/Operations
Topic: Piston Engine Fadec, Diesel Vs Avgas
Replies: 62
Views: 11532

RE: Piston Engine Fadec, Diesel Vs Avgas

Scania and Volvo inline-6:es deliver upwards 550hp from 12L with help of 4-valves, turbocharging/intercooling and turbo-compound. <acronym title="ATRAN Aviatrans Cargo Airlines (Russian Federation)">V8</acronym>:s are only used on the very biggest haulers, and as far as I remember, only deliver a li...

Jump to post
by Grunf
Mon Oct 29, 2007 2:32 pm
Forum: Civil Aviation
Topic: SAS Dumps All Dash 8Q400s Part 2
Replies: 217
Views: 21487

RE: SAS Dumps All Dash 8Q400s Part 2

Well there is a possibility that third accident wan't caused by manufacturing issues but by some <acronym title="Scandinavian Airlines (Denmark/Norway/Sweden)">SK</acronym> snafu. That's a very unfortunate development as general public would like to se 8Q400 grounded no matter what. So aircrafts mig...

Jump to post
by Grunf
Mon Oct 22, 2007 10:21 pm
Forum: Civil Aviation
Topic: LH438 Oct19, Weird Flightpath?
Replies: 3
Views: 2248

RE: LH438 Oct19, Weird Flightpath?

A glitch in data collection. LH plane probably descibes an arc, just like it should but one faulty data point made a jagged line.

Paths are vectorized and interpolated between adjacent position fixes. If one dot is faulty it will describe jagged lines.

Jump to post
by Grunf
Mon Oct 15, 2007 1:01 pm
Forum: Civil Aviation
Topic: Nuclear Powered Aircraft In Future?
Replies: 59
Views: 13215

RE: Nuclear Powered Aircraft In Future?

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Helv...

Jump to post
by Grunf
Thu Oct 11, 2007 10:23 am
Forum: Technical/Operations
Topic: Piston Engine Fadec, Diesel Vs Avgas
Replies: 62
Views: 11532

RE: Piston Engine Fadec, Diesel Vs Avgas

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Helv...

Jump to post
by Grunf
Thu Oct 04, 2007 9:45 am
Forum: Technical/Operations
Topic: HP Compressor Cooling
Replies: 25
Views: 4023

RE: HP Compressor Cooling

My understanding is that compressor stages aren't the problem. Air gets hot while compressed, allright, but no as hot as gases entering HPT. So it's mostly <acronym title="America West Airlines (USA)">HP</acronym> turbine blades that are "on the edge" of material science and need active cooling. I a...

Jump to post
by Grunf
Mon Sep 17, 2007 9:51 pm
Forum: Civil Aviation
Topic: Accident In Phuket..
Replies: 223
Views: 48521

RE: Accident In Phuket..

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Helv...

Jump to post
by Grunf
Mon Sep 17, 2007 6:34 pm
Forum: Civil Aviation
Topic: Accident In Phuket..
Replies: 223
Views: 48521

RE: Accident In Phuket..

Horrible! My toughts go to families of the dead and survivors. Swedish survivor says that they deployed the landing gear in heavy weather, started sinking/approach towards the runway, expirienced rolling movement (one wing dropped), then overshoot the runway. Then he heard landing gear going up agai...

Jump to post
by Grunf
Mon Aug 06, 2007 6:56 pm
Forum: Civil Aviation
Topic: 2 FlyBE Cabin Crew Collapse During Flight!
Replies: 6
Views: 6865

RE: 2 FlyBE Cabin Crew Collapse During Flight!

Lemme guess, it was a Ba146? If it was, it wouldn't be the first time. It happened here in Sweden as well, but it was <acronym title="Continental Airlines (USA)">CO</acronym> or FO (don't remember) who felt sick. It seems that whisperjets they have a nasty habit of ingesting engine oil fumes into pa...

Jump to post
by Grunf
Wed Jun 27, 2007 4:17 am
Forum: Civil Aviation
Topic: First 787 Has Left The Building! Photos
Replies: 441
Views: 298719

RE: First 787 Has Left The Building! Photos

I like Airbus but this is a great looking aircraft! Very stylish Caravell-ish nose.
Well done Boeing!

Jump to post
by Grunf
Tue May 29, 2007 4:46 pm
Forum: Technical/Operations
Topic: Fan Blades
Replies: 17
Views: 5319

RE: Fan Blades

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Helv...

Jump to post
by Grunf
Tue May 08, 2007 12:54 am
Forum: Civil Aviation
Topic: Airbus May Put A380 Nose On A350!
Replies: 125
Views: 27587

RE: Airbus May Put A380 Nose On A350!

I doubt that new nose-job is more efficient aerodynamic-wise. I see it as a packaging compromise (wheel, rest-compartment, avionics, radar) and a way to save few pennies by borrowing existing A380 shape. Those versed in CFD and aerodynamics should chime in, but as far as I know, bullet-shaped origin...

Jump to post
by Grunf
Mon May 07, 2007 11:34 pm
Forum: Civil Aviation
Topic: Airbus May Put A380 Nose On A350!
Replies: 125
Views: 27587

RE: Airbus May Put A380 Nose On A350!

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Helv...

Jump to post
by Grunf
Mon May 07, 2007 10:46 pm
Forum: Civil Aviation
Topic: Airbus May Put A380 Nose On A350!
Replies: 125
Views: 27587

RE: Airbus May Put A380 Nose On A350!

I'm a beancounter and I understand that looks are low on priority ladder BUT I do believe that keeping the old design with it's futuristic 4-piece windows might do more good in long term. Why? Beacuse people are not completly logic. The looks of brand-new composite hi-end plane with a nose job that ...

Jump to post
by Grunf
Mon May 07, 2007 6:32 pm
Forum: Civil Aviation
Topic: Airbus May Put A380 Nose On A350!
Replies: 125
Views: 27587

RE: Airbus May Put A380 Nose On A350!

Hmm...old nose looks "Caravelle"-esque and was IMHO, quite pretty. New nose job looks hideous. I hope they will keep the old nose design. It both looks good (I don't think they should underestimate the aesthetics) and is throwback to history (=Caravelle).

Jump to post
by Grunf
Sun Apr 29, 2007 9:38 pm
Forum: Civil Aviation
Topic: Emirates Profit Is Dh3.1 Billion, 25% More Than'06
Replies: 21
Views: 4565

RE: Emirates Profit Is Dh3.1 Billion, 25% More Than'06

Hmm...interesting. Especially so as Emirates got lot's of flak form A-netters for ordering all those A380's. Bussines-wise, one would be inclined to believe that US model of free open-market carriers would benefit both the customers and industry but reality looks different. Many US carriers are stru...

Jump to post
by Grunf
Tue Apr 03, 2007 8:41 pm
Forum: Technical/Operations
Topic: Cracked And "Burning" Windscreens
Replies: 6
Views: 3241

RE: Cracked And "Burning" Windscreens

I remember reading similar description of events regarding 747 that flew trough volcano cloud. Apparently, flying trough a cloud of fine dust at high speed will effectivly sand-blast the screen. I'm not an expert in this matter but the fact that 14 aircraft expirienced problems do speak about proble...

Jump to post
by Grunf
Fri Mar 30, 2007 10:09 pm
Forum: Civil Aviation
Topic: Concorde: Cost To Each British & French Taxpayer?
Replies: 25
Views: 4795

RE: Concorde: Cost To Each British & French Taxpay

Dude, you are too myoptic when it comes to your thesis. You have your bean-counter hat on and fail to see bigger picture. I understand the harsh economical thinking you were exposed to during the MBA education but you have to widen the views. Granted, we are all aviation nuts here but I believe the ...

Jump to post
by Grunf
Thu Mar 29, 2007 8:44 pm
Forum: Technical/Operations
Topic: Question On Nose Intakes On Douglas DC-8
Replies: 19
Views: 15918

RE: Question On Nose Intakes On Douglas DC-8

Early jet engines had a bad habbit of leaking some oil troughout compressor stages so an turbocharger was used to isolate PAX from bleed air which was considered "dirty". New engines didn't have the problems anymore and turbochargers were removed...

Jump to post
by Grunf
Thu Mar 22, 2007 4:01 pm
Forum: Civil Aviation
Topic: What Will Qantas Do With A380's?
Replies: 86
Views: 10173

RE: What Will Qantas Do With A380's?

The same as they do with 747's. Fly people around and get payed for that  Wink

Jump to post
by Grunf
Wed Mar 21, 2007 10:27 pm
Forum: Civil Aviation
Topic: Caravelle Cabin Configurations
Replies: 23
Views: 5651

RE: Caravelle Cabin Configurations

Are there any flying examples left? I heard there was one old bird in Gabon or similar african country...?

Jump to post
by Grunf
Fri Feb 23, 2007 1:54 am
Forum: Technical/Operations
Topic: Students - How Do They Try To Kill You?
Replies: 59
Views: 10226

RE: Students - How Do They Try To Kill You?

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Helv...

Jump to post
by Grunf
Mon Feb 19, 2007 5:16 pm
Forum: Technical/Operations
Topic: Brake Cooling With Steam
Replies: 24
Views: 5313

RE: Brake Cooling With Steam

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Helv...

Jump to post
by Grunf
Wed Feb 07, 2007 7:44 pm
Forum: Technical/Operations
Topic: Phantom Power
Replies: 6
Views: 2397

RE: Phantom Power

Weird question, hehe. To my knowledge, only condensor microphones use phantom power (used to be 48VDC). Those mics aren't really suited for use in noisy conditions so I doubt Boeing used them. Ordinary dynamic microphones usually fare better and require less circuitry to work.

Jump to post
by Grunf
Fri Jan 26, 2007 8:39 am
Forum: Civil Aviation
Topic: Still Thinking That IL96 Interiors Are Rubbish?
Replies: 72
Views: 18854

RE: Still Thinking That IL96 Interiors Are Rubbish?

Jeez...that's cheesy. I heard that this particular Il96 cost 300M$ (plane+gear onboard) and is grounded right now beacuse of tech problems. Putin is peddaling around in Il62M for time being.

Poor russian people that payed for all that kitch.

Jump to post
by Grunf
Thu Jan 25, 2007 7:54 am
Forum: Technical/Operations
Topic: Magnetic Brakes
Replies: 36
Views: 19066

RE: Magnetic Brakes

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Helv...

Jump to post
by Grunf
Thu Jan 25, 2007 7:04 am
Forum: Technical/Operations
Topic: Magnetic Brakes
Replies: 36
Views: 19066

RE: Magnetic Brakes

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Helv...

Jump to post
by Grunf
Thu Jan 25, 2007 2:58 am
Forum: Civil Aviation
Topic: How Much Lift Is Generated By The Belly Of An A/C?
Replies: 17
Views: 4622

RE: How Much Lift Is Generated By The Belly Of An A/C?

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Helv...

Jump to post
by Grunf
Thu Jan 25, 2007 1:57 am
Forum: Civil Aviation
Topic: How Much Lift Is Generated By The Belly Of An A/C?
Replies: 17
Views: 4622

RE: How Much Lift Is Generated By The Belly Of An A/C?

Well "belly" can produce lift if aircraft is designed to utilize "compression lift", like XB-70

Jump to post
by Grunf
Wed Jan 17, 2007 7:26 pm
Forum: Technical/Operations
Topic: Magnetic Brakes
Replies: 36
Views: 19066

RE: Magnetic Brakes

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Helv...

Jump to post
by Grunf
Wed Jan 17, 2007 6:22 am
Forum: Technical/Operations
Topic: LP/HP Intercooling Idea?
Replies: 13
Views: 3744

RE: LP/HP Intercooling Idea?

Hmm...it seems that <acronym title="Trans Asia Airways (Taiwan)">GE</acronym> already tought about it: <a href="http://www.gepower.com/about/press/en/2003_press/120903h.htm" target=_blank>http://www.gepower.com/about/press/en/2003_press/120903h.htm</a> <TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="b...

Jump to post
by Grunf
Wed Jan 17, 2007 6:12 am
Forum: Technical/Operations
Topic: LP/HP Intercooling Idea?
Replies: 13
Views: 3744

RE: LP/HP Intercooling Idea?

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Helv...

Jump to post
by Grunf
Wed Jan 17, 2007 1:47 am
Forum: Technical/Operations
Topic: LP/HP Intercooling Idea?
Replies: 13
Views: 3744

LP/HP Intercooling Idea?

Hello there! After lurking on Airliners forums for a long time, I joined the club. Please excuse me if my questions are trivial or allready being answered. I tried to search but I couldn't find anything. Now to the question: Jet engines are air-breathing machines. The more oxygen you can cram into c...

Jump to post
by Grunf
Wed Jan 17, 2007 1:30 am
Forum: Technical/Operations
Topic: Magnetic Brakes
Replies: 36
Views: 19066

RE: Magnetic Brakes

Kinetic energy in moving airplane must be dissipated somewhere. In case of magnetic brakes, the disc influenced by permanent magnets will heat up by induced eddy currents. It acts like spinning a electric motor where you short-circuited the terminals. There is no "Kinetic Energy as in Reactive force...

Jump to post
by Grunf
Wed Jan 17, 2007 1:15 am
Forum: Civil Aviation
Topic: Recompression: A320 Worse Than Others?
Replies: 41
Views: 9604

RE: Recompression: A320 Worse Than Others?

<TABLE BORDER=0 ALIGN=CENTER WIDTH=95% style="border-top: 1pt #28455E solid;border-right: 1pt #1B2E3F solid;border-bottom: 1pt #1B2E3F solid;border-left: 1pt #28455E solid;table-layout:fixed;border-spacing:0;padding:0;border-collapse: collapse;" bgcolor=#1E3951><tr><td><font size=2 face="ARIAL, Helv...

Jump to post
by Grunf
Fri Jan 12, 2007 9:56 am
Forum: Technical/Operations
Topic: Why Do UA's 777's Smoke So Much?
Replies: 35
Views: 11821

RE: Why Do UA's 777's Smoke So Much?

777's smoke so they can get high!  <img src="/discussions/graphics/smilies/smirk.gif" alt="smirk" border=0>  P.S. What is the actual AFR in modern burner cans? I guess they are running lean? I always wondered if you could make "diesel" jet by injecting the fuel into compressed/heated air a...

Jump to post