Search found 10 matches

by PerVG
Thu Feb 15, 2018 11:24 pm
Forum: Technical/Operations
Topic: Feasibility of high altitude commercial aircraft
Replies: 6
Views: 1186

Re: Feasibility of high altitude commercial aircraft

and we were discussing why you couldn't hear the sonic boom for the launch (but you could hear it on reentry) and he said something to effect of the fact that after a certain altitude, you can't effectively hear a sonic boom. I'm no expert or anything, but might be that a big factor in not hearing ...

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by PerVG
Tue Feb 13, 2018 11:52 pm
Forum: Civil Aviation
Topic: Ryanair has best passenger load factor of 96%
Replies: 31
Views: 3851

Re: Ryanair has best passenger load factor of 96%

I don't think a 96% load factor is something worth striving for. Calculations I've seen elsewhere suggests the sweet spot is around 85%. If your load factors are near 100%, you should increase the prices of tickets until it drops to around 85%. That's where you make the most money. Not sure that wo...

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by PerVG
Tue Feb 13, 2018 8:01 pm
Forum: Civil Aviation
Topic: A321 NEO LR LBG - JFK Flight Tracker
Replies: 58
Views: 10480

Re: A321 NEO LR CDG - JFK Flight Tracker

Just got back to live tracking and doing about the same speed as all other aircraft on a similar fly path.. ;)

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by PerVG
Tue Feb 13, 2018 12:24 am
Forum: Technical/Operations
Topic: Bypass Flow and Core Flow velocities
Replies: 5
Views: 527

Re: Bypass Flow and Core Flow velocities

Can't be absolute. In order to produce thrust, bypass flow must be accelerated above the vehicle speed. I would guess the delta starts big at take off and then gradually shrinks as the plane picks up speed. But never reaches zero. Core flow could produce thrust at absolute speeds equal or even a bit...

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by PerVG
Sat Feb 10, 2018 4:36 pm
Forum: Technical/Operations
Topic: PW1100G aft hub modification failure
Replies: 53
Views: 4601

Re: PW1100G aft hub modification failure, deliveries halted

GalaxyFlyer wrote:
The only other geared fan engine, the TFE 731


There's also the ALF 502, at least.

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by PerVG
Wed Feb 07, 2018 12:24 pm
Forum: Military Aviation & Space Flight
Topic: SpaceX - Tests, Launches, Developments
Replies: 1300
Views: 122127

Re: SpaceX - Tests, Launches, Developments

Add a Vulcan second stage one day and there is nowhere in our Solar system it can't go. Vulcan is the Ariane engine, did you mean Raptor engine instead? He might be referring to the future Vulcan rocket, by ULA. I highly doubt that ULA would be willing to supply ACES upper stages to SpaceX, though....

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by PerVG
Wed Feb 07, 2018 9:10 am
Forum: Military Aviation & Space Flight
Topic: SpaceX - Tests, Launches, Developments
Replies: 1300
Views: 122127

Re: SpaceX - Tests, Launches, Developments

Watching the live stream of the post-launch news conference, Musk has confirmed that the core did indeed not land safely. As far as I could hear (the audio quality was a bit meh to start out with), it ran out of propellant and hit the water at 300 MPH I understood it run out not of propellant but o...

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by PerVG
Tue Feb 06, 2018 6:44 pm
Forum: Technical/Operations
Topic: What makes the B737 an "old, outdated" design?
Replies: 143
Views: 10127

Re: What makes the B737 an "old, outdated" design?

I would add that a bit of an hard impact upon "landing" was far better than a possible much harder impact upon falling down after stalling, had not the flight envelope protection been in full effect. :)

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by PerVG
Sun Feb 04, 2018 1:06 pm
Forum: Travel, Polls & Preferences
Topic: Use of Electronic Device/Headphones Policy Question
Replies: 7
Views: 521

Re: Use of Electronic Device/Headphones Policy Question

Perhaps it's a safety thing? So that passengers will be readily aware of any crew indications in an emergency situation?
Some airlines might think it makes a difference, and others not so much.
Just guessing, here... ;)

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by PerVG
Tue Jan 23, 2018 11:06 pm
Forum: Civil Aviation
Topic: Norway is to make all short-haul planes electric by 2040
Replies: 252
Views: 14950

Re: Norway is to make all short-haul planes electric by 2040

*Or did I calculate something wrong? Entirely possible. I know engine efficiency is not in the calculations but it should be good enough to not cause problems. You did. Hint: 18650 cell can provide 80W of power for how many miliseconds? Many. I would appreciate if you could spend at least few secon...

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