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by kalvado
Wed Oct 05, 2022 3:40 pm
Forum: Technical/Operations
Topic: concorde with more than 100 passenger?
Replies: 16
Views: 951

Re: concorde with more than 100 passenger?

I was always under the impression that weight on Concorde was a major consideration. If so, one has to wonder not that it could carry 128 passengers, but could it lift the extra 28 passengers? Then, carrying them, would it have sufficient range to fly anywhere worthwhile with a 3000 Kg fuel hit? Co...

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by kalvado
Wed Oct 05, 2022 12:30 pm
Forum: Technical/Operations
Topic: concorde with more than 100 passenger?
Replies: 16
Views: 951

Re: concorde with more than 100 passenger?

With Concorde being very fuel thirsty.... Would those extra pax have too much effect on the range?

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by kalvado
Thu Sep 29, 2022 10:53 pm
Forum: Technical/Operations
Topic: FAA approves Gami100UL for entire piston engine fleet
Replies: 39
Views: 4642

Re: FAA approves Gami100UL for entire piston engine fleet

Low RPM, I agree with, but Lycoming and Continental compression ratios are nothing to be excited about—7:1 to 9:1 typically. Any car today with electronic controls is much higher—11:1 often. Brake Mean Effective Pressure (BMEP) might be a difference in the two applications. The lack of approved ele...

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by kalvado
Wed Sep 21, 2022 12:47 am
Forum: Technical/Operations
Topic: Technical=Arithmetics question
Replies: 11
Views: 1202

Re: Technical=Arithmetics question

10 statute miles up in the air is more like 52800 feet. Darn! I thought it would actually be much, much lower!! Like, maybe 5 or 10 thousand feet? :lol: Thanks man! Is this sarcasm or did you really think a statute mile was a 1,000’? Since 1 kilometer is 1000 meters, it should be a plausible assump...

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by kalvado
Thu Sep 08, 2022 8:37 pm
Forum: Technical/Operations
Topic: 737 Max 9 performance
Replies: 28
Views: 5178

Re: 737 Max 9 performance

If the runway at SAN was a factor, United would sure be having a hard time with their 7M9s out of OGG. This had to do with the weather in MCO and nothing else. Lol, no. Lol, yes. The MAX really is a runway hog, even with 28k engines. It's easy to see the max9 running into tow restrictions from SAN ...

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by kalvado
Wed Sep 07, 2022 12:36 pm
Forum: Technical/Operations
Topic: International flights arriving a day before
Replies: 9
Views: 1856

Re: International flights arriving a day before

Further to info posted, this is also why most airlines adhere to UTC time for internal purposes. Keeps things uniform. Was always fun explaining to new hires that tonight’s flight is actually on the schedule as tomorrows, and so on. But could be a bit challenging to understand, especially when conv...

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by kalvado
Mon Sep 05, 2022 9:12 pm
Forum: Technical/Operations
Topic: FAA approves Gami100UL for entire piston engine fleet
Replies: 39
Views: 4642

Re: FAA approves Gami100UL for entire piston engine fleet

Mixed xylenes are a hugely important, ever growing, petrochemical product at the moment. Asia-Pacific is building dedicated units: crude oil in => paraxylene out. In millions of tons each. China is big on these. Demand for polyester (bottles and fibres) drives that. What kind of volumes in Avgas ar...

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by kalvado
Mon Sep 05, 2022 8:39 pm
Forum: Technical/Operations
Topic: FAA approves Gami100UL for entire piston engine fleet
Replies: 39
Views: 4642

Re: FAA approves Gami100UL for entire piston engine fleet

Do you understand the ridiculous amount of testing that has gone on? Lead itself is an additive...to increase octane. I don't see how you don't believe "cheaper as production scales up." It is all about economies of scale. Indeed, this stuff may well have more applications than aviation, ...

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by kalvado
Mon Sep 05, 2022 8:08 pm
Forum: Technical/Operations
Topic: FAA approves Gami100UL for entire piston engine fleet
Replies: 39
Views: 4642

Re: FAA approves Gami100UL for entire piston engine fleet

If they did, 100LL, 100R or G100UL would be irrelevant to the discussion. Incidentally, the guys at GAMI found that G100UL outperforms even the old 115/145 Purple Avgas that was used in Constellations and DC-7s. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&...

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by kalvado
Mon Sep 05, 2022 12:15 pm
Forum: Technical/Operations
Topic: FAA approves Gami100UL for entire piston engine fleet
Replies: 39
Views: 4642

Re: FAA approves Gami100UL for entire piston engine fleet

The guys at GAMI are pretty amazing. They have said they expect a temporary premium of 50-75 cents per gallon while production ramps up, but then prices to drop once the infrastructure and production are there. They anticipate, probably quite correctly, that this extra cost will be largely absorbed...

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by kalvado
Mon Sep 05, 2022 11:09 am
Forum: Technical/Operations
Topic: FAA approves Gami100UL for entire piston engine fleet
Replies: 39
Views: 4642

Re: FAA approves Gami100UL for entire piston engine fleet

The guys at GAMI are pretty amazing. They have said they expect a temporary premium of 50-75 cents per gallon while production ramps up, but then prices to drop once the infrastructure and production are there. They anticipate, probably quite correctly, that this extra cost will be largely absorbed...

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by kalvado
Sun Sep 04, 2022 10:42 pm
Forum: Technical/Operations
Topic: FAA approves Gami100UL for entire piston engine fleet
Replies: 39
Views: 4642

Re: FAA approves Gami100UL for entire piston engine fleet

https://patents.google.com/patent/US8628594B1/en
-->

Looks like their only patent is for methyl benzene additives. Good luck selling that in CA.
Nothing on valve lubricantion so far
https://patents.google.com/patent/US8628594B1/en

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by kalvado
Sat Sep 03, 2022 11:24 pm
Forum: Technical/Operations
Topic: FAA approves Gami100UL for entire piston engine fleet
Replies: 39
Views: 4642

Re: FAA approves Gami100UL for entire piston engine fleet

r6russian wrote:
hopefully its way cheaper than 100LL.

60-80 cents per gallon more at the refinery.

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by kalvado
Sat Sep 03, 2022 6:50 pm
Forum: Technical/Operations
Topic: FAA approves Gami100UL for entire piston engine fleet
Replies: 39
Views: 4642

Re: FAA approves Gami100UL for entire piston engine fleet

Secondary or not, but if engine operation relied on that - new fuel should provide same effect. Any insight on how that is achieved? Burning oil like some motorcycles do may be as bad of an idea.... Back when the unleaded fuel was introduced to cars, the best option was to get modern heads, so the ...

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by kalvado
Sat Sep 03, 2022 12:53 pm
Forum: Technical/Operations
Topic: FAA approves Gami100UL for entire piston engine fleet
Replies: 39
Views: 4642

Re: FAA approves Gami100UL for entire piston engine fleet

Mechanically, it shouldn’t do much. Lead is added to the fuel to bring stability to it and subsequently allow the high octane to exist. This allows the high compression in the engines that provide the most horsepower for the least amount of weight. If the 100UL is as stable as promised (and tested ...

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by kalvado
Sun Aug 21, 2022 11:16 am
Forum: Technical/Operations
Topic: Strobe & Beacon Light Question
Replies: 20
Views: 2904

Re: Beacon Light Question

zeke wrote:
Jacobrhassell wrote:

So why does Airbus refuse to implement this advanced light? Even on the new A350 and A330-900, it’s still the “strobe” light.

Thanks for the help!


A picture is worth a 1000 words, Nuff said

Image

Where are the flashing beacons in this photo?

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by kalvado
Fri Aug 19, 2022 4:08 pm
Forum: Technical/Operations
Topic: Strobe & Beacon Light Question
Replies: 20
Views: 2904

Re: Strobe & Beacon Light Question

I am not sure if Collins is the sole supplier of those lights for Airbus, but they have some interesting brochures. At least for A350 Collins doesn't offer any strobes in their brochure: https://www.collinsaerospace.com/-/media/CA/product-assets/files/military-and-defense/lighting/pdfs/aircraft-over...

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by kalvado
Fri Aug 19, 2022 11:24 am
Forum: Technical/Operations
Topic: Strobe & Beacon Light Question
Replies: 20
Views: 2904

Re: Beacon Light Question

Could also be a difference in led design for longer ir shorter pulse.
At the very least, from the OP list - 320 has an external all- LED retrofit option for 320ceo from Collins, including beacons.

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by kalvado
Thu Aug 18, 2022 12:38 am
Forum: Technical/Operations
Topic: Airbridge / Jet bridge failure
Replies: 23
Views: 2935

Re: Airbridge / Jet bridge failure

And how long can that take. Vendor is going to ship those parts in 3 weeks, if everything works as planned. Oh, dear. That sounds like quite the kerfuffle. I don't know that the airlines would like having a plane stuck there for that long, and depending on the airport, I'm guessing the airport auth...

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by kalvado
Thu Aug 18, 2022 12:28 am
Forum: Technical/Operations
Topic: Airbridge / Jet bridge failure
Replies: 23
Views: 2935

Re: Airbridge / Jet bridge failure

AirKevin wrote:
FGITD wrote:
AirKevin wrote:
So what would their approved method be.


Their solution is to wait until the bridge is fixed and can be moved away on its own power. Which is fine, except when you’ve got a schedule to keep

And how long can that take.

Vendor is going to ship those parts in 3 weeks, if everything works as planned.

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by kalvado
Wed Aug 10, 2022 6:40 pm
Forum: Technical/Operations
Topic: APU Thrust?
Replies: 13
Views: 2726

Re: APU Thrust?

viewtopic.php?t=776251
Like always, there are some odd examples
-->

pretty long discussion: viewtopic.php?t=776251
Like always, there are some odd examples

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by kalvado
Mon Aug 08, 2022 7:40 pm
Forum: Technical/Operations
Topic: Max and Neo Seat Miles per Gallon CFM
Replies: 32
Views: 5072

Re: Max and Neo Seat Miles per Gallon CFM

Do you wanna go that route? Are you comparing the amount of health problems stemming from renewables and EV batteries with fossile fuels? Do you think it is within even one, two or three orders of magnitude? https://www.sciencedirect.com/science/article/abs/pii/S0013935121000487?via%3Dihub That bel...

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by kalvado
Mon Aug 08, 2022 10:58 am
Forum: Technical/Operations
Topic: Max and Neo Seat Miles per Gallon CFM
Replies: 32
Views: 5072

Re: Max and Neo Seat Miles per Gallon CFM

That belief is absolutely 100% without merit. It is off topic for this thread, but useful enough since it signalise with 100% accuracy which posters not to trust regarding technical matters. Yes, but is vastly less efficient then a EV. So, in 10 years time planes will be one of the biggest pollutan...

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by kalvado
Sun Aug 07, 2022 2:59 am
Forum: Technical/Operations
Topic: Max and Neo Seat Miles per Gallon CFM
Replies: 32
Views: 5072

Re: Max and Neo Seat Miles per Gallon CFM

Let's spell out conditions. Can we compare A321N and Tesla on a JFK-SYD trip? That is quite an edgecase. Are you suggesting that planes can only compete with EV'S on those edgecase? I am suggesting than EVs are in distinct different niche from planes, and their admirers tend to wear thick rose glas...

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by kalvado
Sat Aug 06, 2022 8:29 pm
Forum: Technical/Operations
Topic: Max and Neo Seat Miles per Gallon CFM
Replies: 32
Views: 5072

Re: Max and Neo Seat Miles per Gallon CFM

Yes, but is vastly less efficient then a EV. So, in 10 years time planes will be one of the biggest pollutants. Probably still after cruise ships, but efficiency compared to cars will be a losing battle… I simply don’t agree with those comments, when looking at the the true costs of running cars an...

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by kalvado
Sat Aug 06, 2022 8:26 pm
Forum: Technical/Operations
Topic: Max and Neo Seat Miles per Gallon CFM
Replies: 32
Views: 5072

Re: Max and Neo Seat Miles per Gallon CFM

Keep in mind the following which are skewing the numbers: - most of the A320/A321 are operated by LCCs/ULCCs which cram 10-20% more seats in compared to the big 3. Therefore, they fundamentally have higher seat miles per gallon. - stage length and airport mix skew these numbers. On balance, they’re...

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by kalvado
Fri Aug 05, 2022 3:52 pm
Forum: Technical/Operations
Topic: Question on aircraft tires
Replies: 15
Views: 2023

Re: Question on aircraft tires

Bad Idea for Stopping Distance - One big safety point everyone is missing, is that the drag from the touchdown helps to shorten the stopping distance. Therefore the expensive motor / scoop "solution" to the cost of tire wear will all be made up for when even one hull is lost to overruns n...

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by kalvado
Thu Aug 04, 2022 10:15 am
Forum: Technical/Operations
Topic: Question on aircraft tires
Replies: 15
Views: 2023

Re: Question on aircraft tires

I personally haven’t changed many tires for flat spotting in my careeer- If any. I don’t think landings impact tire wear that much. You generally get your money’s worth out of the tire. Makes me think any kind of wheel spin up device is largely irrelevant. Black rubber marks at touchdown beg to dif...

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by kalvado
Fri Jul 29, 2022 8:28 pm
Forum: Technical/Operations
Topic: Watchdog finds weaknesses in FAA Oversight of Boeing airplane flight manuals
Replies: 1
Views: 1071

Re: Watchdog finds weaknesses in FAA Oversight of Boeing airplane flight manuals

Bottom line (rather 3 bottom paragraphs of the article): FAA and Boeing still think it is about pilots. Since this is in tech-ops, I am not commenting any further.

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by kalvado
Fri Jul 29, 2022 2:58 pm
Forum: Technical/Operations
Topic: Why no single-engine GA aircraft with contrarotating propellers?
Replies: 40
Views: 3617

Re: Why no single-engine GA aircraft with contrarotating propellers?

Just a crazy question... Would it be feasible to have 2 counter rotating turbine stages and shafts to drive 2 props? I suppose it would be possible. But I think you'd run into issues keeping both turbines at the ideal speed for the respective prop.. thinking about it, just as a mental exercise... t...

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by kalvado
Thu Jul 28, 2022 1:51 pm
Forum: Technical/Operations
Topic: Why no single-engine GA aircraft with contrarotating propellers?
Replies: 40
Views: 3617

Re: Why no single-engine GA aircraft with contrarotating propellers?

Just a crazy question... Would it be feasible to have 2 counter rotating turbine stages and shafts to drive 2 props?

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by kalvado
Wed Jul 27, 2022 7:24 pm
Forum: Technical/Operations
Topic: AA6092 20JUL - TCAS maneuver - how common?
Replies: 11
Views: 2383

Re: AA6092 20JUL - TCAS maneuver - how common?

Is is correct. My comment had nothing to do with ATC tracking an airplane. I was describing possible states of the system. Okay however, when you put down "the transponders are on or in standby" that is what my comment was based upon. TCAS standby mode: Stand-by : Power is applied to the ...

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by kalvado
Thu Jun 30, 2022 4:45 pm
Forum: Technical/Operations
Topic: Installing/ Uninstalling ETOPS On An Aircraft
Replies: 64
Views: 10132

Re: Installing/ Uninstalling ETOPS On An Aircraft

Maybe in your part of the world for now, but here, ETOPS has everything to do with twins, as your original incorrect statement stated. Hmmm, ETOPS on 737 Twin. Hmmmm, don't see any EDTO... What you are saying is simply out of date, the FAA rules changed in 2007 "For the first time, this new ru...

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by kalvado
Thu Jun 30, 2022 11:41 am
Forum: Technical/Operations
Topic: Installing/ Uninstalling ETOPS On An Aircraft
Replies: 64
Views: 10132

Re: Installing/ Uninstalling ETOPS On An Aircraft

Thanks for proving the point. ETOPS has everything to do with twins. Nope, the T in ETOPS does not mean twins, it used to some time ago, the rules were changed. ETOPS now means “extended operations”, it is no longer stands for “extended twin engine operations”. Under the new ETOPS rules a MD-11 and...

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by kalvado
Sat Jun 25, 2022 12:29 pm
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6488

Re: Air France 447: 13 years on

The automation on an Airbus doesn't "drop dead" if it doesn't work. There is a wide range of degradations depending on the specific failure. For exanple, even if the AP disconnects, you're most likely still in Normal Law with all protections. In that sense, FBW automation has no right to ...

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by kalvado
Fri Jun 24, 2022 10:45 pm
Forum: Technical/Operations
Topic: Concorde time spent at max thrust with full reheat
Replies: 29
Views: 3889

Re: Concorde time spent at max thrust with full reheat

I suspect going through M=1.0 would still require an afterburner. I don't think any plane today can accelerate supersonic on turbojet/turbofan with no afterburn. Supersonic cruise without an afterburner is the general goal. Most modern fighter jets can accelerate to supersonic speeds without afterb...

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by kalvado
Fri Jun 24, 2022 7:38 pm
Forum: Technical/Operations
Topic: Concorde time spent at max thrust with full reheat
Replies: 29
Views: 3889

Re: Concorde time spent at max thrust with full reheat

I believe the maximum time in reheat was 15 minutes Is that limited by fuel tank capacity? Probably and perhaps an engine limitation, IIRC that was enough time to allow the acceleration from .95 at mid altitudes to 1.7 Mach around FL 450 after a steady accelerating cruise climb continuing at lower ...

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by kalvado
Fri Jun 24, 2022 7:29 pm
Forum: Technical/Operations
Topic: Air France 447: 13 years on
Replies: 56
Views: 6488

Re: Air France 447: 13 years on

You don't have to feel superior, I am referring to the fact that pilot is supposed to take over in case things become nonstandard. Yes, older generation computers are not setup for anything else; they possibly could have more authority, though. Next generation could definitely be more capable. Woul...

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by kalvado
Fri Jun 24, 2022 6:51 pm
Forum: Technical/Operations
Topic: Concorde time spent at max thrust with full reheat
Replies: 29
Views: 3889

Re: Concorde time spent at max thrust with full reheat

Last thing first: normal noise on BA/AF Concorde during flight was so loud as to prohibit normal conversation - one had to raise their voice to be heard. I used ear plugs on my flight. Re-heat (afterburner) was used only during takeoff, cancelled after entry into third segment climb, and then again...

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by kalvado
Fri Jun 24, 2022 1:31 pm
Forum: Technical/Operations
Topic: Concorde time spent at max thrust with full reheat
Replies: 29
Views: 3889

Re: Concorde time spent at max thrust with full reheat

Is that limited by fuel tank capacity? Certainly in military circles, afterburner limitations are mostly driven by heat management; nozzles, exhaust ducts, surrounding structure etc. I suspect that Concorde would be no different. Certainly supply of humor to military was recently cut by Congress du...

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by kalvado
Fri Jun 24, 2022 11:33 am
Forum: Technical/Operations
Topic: Concorde time spent at max thrust with full reheat
Replies: 29
Views: 3889

Re: Concorde time spent at max thrust with full reheat

Max Q wrote:
I believe the maximum time in reheat was 15 minutes

Is that limited by fuel tank capacity?

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by kalvado
Thu Jun 23, 2022 3:52 pm
Forum: Technical/Operations
Topic: Concorde time spent at max thrust with full reheat
Replies: 29
Views: 3889

Re: Concorde time spent at max thrust with full reheat

Reheat is used on every take-off, its light-up sequence taking place on the roll as the engines accelerates up to full power – it needs the mass flow associated with an N1 of 81% or more to function. It is switched off at 500ft on a standard flight or at noise abatement cut-back where needed. For t...

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by kalvado
Mon Jun 20, 2022 8:41 pm
Forum: Technical/Operations
Topic: GIV Twin Engine Plight Planning Chart
Replies: 14
Views: 1072

Re: GIV Twin Engine Plight Planning Chart

Sort of a useless chart, have to go elsewhere to find trip fuel, find alternate and holding fuel. Once you know those inputs, the chart gives you initial FL. Big Whoop! But, it’s 30+ years old. There is clearly a bit more to this chart. Purple line coming from another chart at right-bottom should r...

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by kalvado
Mon Jun 20, 2022 3:41 pm
Forum: Technical/Operations
Topic: GIV Twin Engine Plight Planning Chart
Replies: 14
Views: 1072

Re: GIV Twin Engine Plight Planning Chart

OK, so in this screen shot, landing weight of 50 + 11000 fuel burn == 61000 TOW. Blue line is laid over 61000 and this tells me I can just make it to FL430 but not FL450? https://imgur.com/SmpIw5Z Correct. Well, at least initially you are limited to 430. As @GalaxyFlyer said, you should be able to ...

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by kalvado
Mon Jun 20, 2022 1:54 pm
Forum: Technical/Operations
Topic: GIV Twin Engine Plight Planning Chart
Replies: 14
Views: 1072

Re: GIV Twin Engine Plight Planning Chart

So this is what I ended up with. Line #7 (blue line) representing the flight level line. https://imgur.com/Bk0ieFq THat is perfectly correct. I would put it a bit differently, though - this line represents TOW, and hence maximum FL you can climb right after takeoff. Same thing, just a bit different...

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by kalvado
Mon Jun 20, 2022 6:14 am
Forum: Technical/Operations
Topic: GIV Twin Engine Plight Planning Chart
Replies: 14
Views: 1072

Re: GIV Twin Engine Plight Planning Chart

rfresh737 wrote:
I don’t get how you determine 68klb TO weight? I have to be missing something.

They plot for 49 klb landing weight, and get 19 klb fuel burn for whatever flight distance they solve for.
49+19=68

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by kalvado
Mon Jun 20, 2022 12:39 am
Forum: Technical/Operations
Topic: GIV Twin Engine Plight Planning Chart
Replies: 14
Views: 1072

Re: GIV Twin Engine Plight Planning Chart

Are you talking about "max initial FL" lines? Think about them as constant take-off weight lines. upper left border says "max initial FL410 @ MTOW (74.5klb). Sample plotted situation of 49klb landing + 19 klb fuel burn = 68klb TOW allows climb to FL410 (line to the left of planning po...

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by kalvado
Fri Jun 17, 2022 1:51 pm
Forum: Technical/Operations
Topic: How does the IFE display things like altitude and speed
Replies: 50
Views: 5065

Re: How does the IFE display things like altitude and speed

You could only interfere with gauges if you able to access the cable running between the engines for example and the piece of avionics that drives the gauges. To do that you need to be not in the aircraft cabin. These data busses are not new tech, they are very old reliable tech that only allows so...

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