Search found 172 matches

by MatthewDB
Wed Dec 27, 2017 10:32 pm
Forum: Military Aviation & Space Flight
Topic: SpaceX - Tests, Launches, Developments
Replies: 2083
Views: 298446

Re: SpaceX - Tests, Launches, Developments

Interesting.... I just noticed that the overhead picture of the FH in post #770 is a composite of two pictures cropped together!. Tugg I think there have to be more pictures stiched together. There is no way you can take a single picture of a 230ft rocket inside a relatively narrow assambly hall, s...

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by MatthewDB
Fri Dec 15, 2017 4:44 am
Forum: Civil Aviation
Topic: Pax Video Of Bird Strike To No. 2 Fan During Take-off
Replies: 22
Views: 6473

Re: Pax Video Of Bird Strike To No. 2 Fan During Take-off

The writing was a bit sloppy. At the risk of being cruel, what was causing the unusual noise, the engine or the bird? Vibration from the out of balance fan with missing and/or bent fan blades. I witnessed a three goose ingestion about 15 years ago on a 767. I was in the window seat in a 757 on the ...

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by MatthewDB
Fri Dec 15, 2017 4:41 am
Forum: Civil Aviation
Topic: Pax Video Of Bird Strike To No. 2 Fan During Take-off
Replies: 22
Views: 6473

Re: Pax Video Of Bird Strike To No. 2 Fan During Take-off

kjeld0d wrote:
MatthewDB wrote:
takeoff que


¿takeoff que?


That's funny right there :)

No idea why my phone thought the second ue in queue was extra.

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by MatthewDB
Wed Dec 13, 2017 10:31 pm
Forum: Civil Aviation
Topic: Pax Video Of Bird Strike To No. 2 Fan During Take-off
Replies: 22
Views: 6473

Re: Pax Video Of Bird Strike To No. 2 Fan During Take-off

The writing was a bit sloppy. At the risk of being cruel, what was causing the unusual noise, the engine or the bird? Vibration from the out of balance fan with missing and/or bent fan blades. I witnessed a three goose ingestion about 15 years ago on a 767. I was in the window seat in a 757 on the ...

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by MatthewDB
Tue Dec 12, 2017 9:53 pm
Forum: Civil Aviation
Topic: Fate of UA 747s
Replies: 23
Views: 4654

Re: Fate of UA 747s

Western727 wrote:
United_fan wrote:
MatthewDB wrote:
So is the 747 conversion freighter dead now too?


Has been for a while. That and most operators favor GE engines.


Because?

Separately, can a PW-engined example not be re-engined with CF6s?


767 and 777 are cheaper to run, even considering more aircraft to carry the same amount cargo.

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by MatthewDB
Tue Dec 12, 2017 9:50 pm
Forum: Civil Aviation
Topic: Tracking a flight by location and time
Replies: 2
Views: 207

Re: Tracking a flight by location and time

XAM2175 wrote:
FlightRadar24 offers a global playback feature.


Wow, thank you, that's going to turn into a giant time killer ;-)

In this case it turns out to be a Boeing 787 checkout flight.

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by MatthewDB
Tue Dec 12, 2017 9:12 pm
Forum: Civil Aviation
Topic: Fate of UA 747s
Replies: 23
Views: 4654

Re: Fate of UA 747s

So is the 747 conversion freighter dead now too?

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by MatthewDB
Tue Dec 12, 2017 9:10 pm
Forum: Civil Aviation
Topic: Tracking a flight by location and time
Replies: 2
Views: 207

Tracking a flight by location and time

I happen to live in an area where there is quite a bit of traffic going at cruise altitude. Every now and then when I see something "funny" and it tweaks my curiosity (particularly U-turns in the sky). Sometimes it is easy to figure out, for example SEA is fogged in so a number of aircraft...

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by MatthewDB
Tue Dec 12, 2017 9:05 pm
Forum: Civil Aviation
Topic: Oregon Aviation Thread - 2017
Replies: 722
Views: 89501

Re: Oregon Aviation Thread - 2017

Just curious, when they do diversions from SEA to PDX, do they put passengers on a bus and run them to Seattle? Or wait until SEA weather clears?

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by MatthewDB
Tue Dec 12, 2017 8:30 pm
Forum: Civil Aviation
Topic: Lithium-ion battery fails on UA 787 flight
Replies: 302
Views: 92389

Re: Lithium-ion battery fails on UA 787 flight

Does anyone know if the battery assists the GPU in getting the engine started? If that was the case, it would make sense that starting the first of the two engines would be hard on the batteries too. No, it doesn't Thanks, I expected the answer to be no, but wasn't sure. So this even more re-enforc...

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by MatthewDB
Fri Dec 08, 2017 5:37 pm
Forum: Civil Aviation
Topic: Lithium-ion battery fails on UA 787 flight
Replies: 302
Views: 92389

Re: Lithium-ion battery fails on UA 787 flight

So I'm not getting how that makes a 787 unique in the battery demand. AFAIK, ground air start is rare, most of the time all large aircraft use APU start. All that is unique is that the 787 APU generator is the motor instead of a DC start motor and the APU generator has to power the engine start vs....

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by MatthewDB
Fri Dec 08, 2017 2:35 pm
Forum: Civil Aviation
Topic: Lithium-ion battery fails on UA 787 flight
Replies: 302
Views: 92389

Re: Lithium-ion battery fails on UA 787 flight

As far as I understood this: due to the high electric power but no air power demand a single GPU unit was not sufficient to start an engine. syncing two GPU units and the solid state 3ph AC infrastructure on board was problematic ( killing GPU units ). "Simple" solution was : Start APU fr...

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by MatthewDB
Fri Dec 08, 2017 7:27 am
Forum: Civil Aviation
Topic: Lithium-ion battery fails on UA 787 flight
Replies: 302
Views: 92389

Re: Lithium-ion battery fails on UA 787 flight

They'd have some difficulty. Battery capacity is needed for an engine out landing as braking is fully electric actuation. Below where the RAT is effective braking to a standstill requires most of the "very short term" available battery capacity. ( much less then nominal (1/5th 1/10th C di...

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by MatthewDB
Fri Dec 08, 2017 7:10 am
Forum: Civil Aviation
Topic: Lithium-ion battery fails on UA 787 flight
Replies: 302
Views: 92389

Re: Lithium-ion battery fails on UA 787 flight

So, why is nobody mentioning Ni-MH? (apart from myself). Ni-MH is pretty good for most household applications. But they perform poorly at low temperature. All battery types perform less well as temperature drops well below freezing. But in this respect Ni-MH is pretty much inferior to Ni-Cd and Lea...

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by MatthewDB
Thu Nov 30, 2017 8:24 am
Forum: Civil Aviation
Topic: Airbus, Rolls-Royce and Siemens team up for hybrid-electric flight demonstrator
Replies: 110
Views: 42197

Re: Airbus, Rolls-Royce and Siemens team up for hybrid-electric flight demonstrator

Who said anything about steam turbines? I said combine cycle. That can use any number of working fluids. In particular, super-critical CO2 allows for extremely compact waste heat recovery units. Point taken. Now that you mention it, I have heard some news of sCO2 proposals to replace the steam cycl...

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by MatthewDB
Wed Nov 29, 2017 5:48 am
Forum: Civil Aviation
Topic: Airbus, Rolls-Royce and Siemens team up for hybrid-electric flight demonstrator
Replies: 110
Views: 42197

Re: Airbus, Rolls-Royce and Siemens team up for hybrid-electric flight demonstrator

Modern gas turbines are around 30-40% efficient in simple-cycle, mechanical drive applications like an aero engine. However, hybrid propulsion would allow gas turbines optimized purely for power generation, in which case 60% efficiency is feasible with recuperation or combine cycle. There are TRL 9...

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by MatthewDB
Thu Nov 02, 2017 1:40 am
Forum: Civil Aviation
Topic: Air Canada receives first 737 MAX
Replies: 166
Views: 22997

Re: Air Canada receives first 737 MAX

I knew Boeing was going "forward & up" to fit the new LEAP engine on the short geared 737, but seeing that picture really affirms just how much. The whole dang engine is in front of the wing. It just doesn't seem proportionally correct.

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by MatthewDB
Mon Oct 30, 2017 5:21 am
Forum: Civil Aviation
Topic: Oregon Aviation Thread - 2017
Replies: 722
Views: 89501

Re: Oregon Aviation Thread - 2017

Just noticed the DL AMS flight is now on a 763. It has been an A333 year round for over a year now. So, is this a new down gauge for the low season, or temporary? I was shocked when I took the flight a year ago. I was outbound on a Saturday and there was something like 120 onboard. (I was towards t...

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by MatthewDB
Sat Oct 28, 2017 6:01 am
Forum: Civil Aviation
Topic: Enhanced Security for Inbound Flights to USA Starts Thursday
Replies: 28
Views: 8219

Re: Enhanced Security for Inbound Flights to USA Starts Thursday

I really don't know what good these interview questions do, other than satisfy security theatrics. Do they they really think a guy is going to say " yes, my bag was given to me by my handler who uses a code name"? Gate checks of hand luggage I can see, but anyone with ulterior motives wil...

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by MatthewDB
Thu Oct 26, 2017 3:46 pm
Forum: Civil Aviation
Topic: Jet2 flies a 737 with one passenger !
Replies: 61
Views: 10350

Re: Jet2 flies a 737 with one passenger !

When I was a child and as my dad was a captain / flight instructor on the Caravelle 12, he would once in a while take me with him when positioning an aircraft for flight training (used to happen in Nîmes / FNI). Of course I would not be onboard during the training, only on the positioning non-reven...

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by MatthewDB
Thu Oct 26, 2017 6:14 am
Forum: Civil Aviation
Topic: Jet2 flies a 737 with one passenger !
Replies: 61
Views: 10350

Re: Jet2 flies a 737 with one passenger !

I've been close twice. The first was a 737 from LAS to PDX with 5 onboard. I was (slightly) bummed when they informed us that only 1 of us got to sit in 1st class because of weight - balance. The second was a redeye from PDX to ATL with 6 on a 767. It was a drastic contrast to the last row on a tota...

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