Search found 1835 matches

by Gabriel
Thu May 01, 2008 7:25 pm
Forum: Aviation Discussion Forum
Topic: WestJet Continues to soar amidst many others collapse
Replies: 5
Views: 758

Re: WestJet Continues to soar amidst many others collapse

I simply can't believe that I see this kind of things, more frequently as time goes by. Does it means that if a executive of a company says something like "we have a plan to increase our profits by 10%, and the results of the first quarter show that our plan is capable of achiveing this goal, and pe...
by Gabriel
Wed Apr 30, 2008 10:08 am
Forum: Aviation Safety Discussion Forum
Topic: RyanAir goes off runway at my local airport
Replies: 20
Views: 2518

Re: RyanAir goes off runway at my local airport

It doesn't look like EMAS, but it doesn't look like a sand bed either (ok, not sand, but the other thingy like what they put at the sides of the F1 race tracks).
It's strange that the nose wheel sunk but the main wheels, which take most of the load by far, didn't.
by Gabriel
Tue Apr 29, 2008 1:09 am
Forum: Aviation Discussion Forum
Topic: FAO Gabriel- Pickup truck tailgate aerodynamics.
Replies: 10
Views: 1091

Re: FAO Gabriel- Pickup truck tailgate aerodynamics.

Wild guess: Nothing scientific, but if you have been behind a pickup truck and seen a newspaper flying around the box without getting to your windshield, you can imagine that there is a big lift (vacuum) force there, and if you open the tailgate, you will lose that vacuum. Of course, I asume the st...
by Gabriel
Mon Apr 28, 2008 11:10 pm
Forum: Aviation Discussion Forum
Topic: FAO Gabriel- Pickup truck tailgate aerodynamics.
Replies: 10
Views: 1091

Re: FAO Gabriel- Pickup truck tailgate aerodynamics.

The short answer to this is very easy for me to give: I have no idea. However, assuming that what you say was true, then I could try to "invent" some explanation (after all, if that was true there should be some explanation). The first thing I thought when I read the proposition was that some swirl ...
by Gabriel
Mon Apr 28, 2008 2:48 am
Forum: Aviation Discussion Forum
Topic: LEMAC, TEMAC, MAC, WTF
Replies: 5
Views: 1115

Re: LEMAC, TEMAC, MAC, WTF

Yeah, he said he made a typo on it. :x And it'd actually be -25%
Yup, sorry. 5" ahead of the LEMAC in a 20" MAC is -25% (which is even worse!)
By the way, the weight data and the airplane drawing are useless to solve the problem.
by Gabriel
Sat Apr 26, 2008 5:54 pm
Forum: Aviation Discussion Forum
Topic: FAA: Going From Bad to Worse
Replies: 14
Views: 1323

Re: FAA: Going From Bad to Worse

What do I have to do with this?
Who cares? Flyboy certaily doesn't.
by Gabriel
Sat Apr 26, 2008 5:41 pm
Forum: Aviation Discussion Forum
Topic: LEMAC, TEMAC, MAC, WTF
Replies: 5
Views: 1115

Re: LEMAC, TEMAC, MAC, WTF

20" and -20%, what means that you'll never take off.
by Gabriel
Thu Apr 24, 2008 8:07 am
Forum: Aviation Safety Discussion Forum
Topic: BA 777 @ LHR
Replies: 431
Views: 28482

Re: BA 777 @ LHR

I agree with you. I work everyday with vacuum systems too and you are right, to keep a high vacuum is very hard, specially in tank that has not one but several vents and that it's interconnected with other tanks that have several vents too, to what I'd add that I've never heard of an accident or eng...
by Gabriel
Thu Apr 24, 2008 4:48 am
Forum: Aviation Safety Discussion Forum
Topic: BA 777 @ LHR
Replies: 431
Views: 28482

Re: BA 777 @ LHR

Gabriel, "IF" the tanks were full and the vents plugged, the max achievable vacuum is reached while fuel (an incompressible fluid) fills >95% of the tank volume. With full tanks, the potential is for engine flame out due to fuel starvation with no chance of structural damage. I still don't get it. ...
by Gabriel
Thu Apr 24, 2008 12:36 am
Forum: Aviation Safety Discussion Forum
Topic: BA 777 @ LHR
Replies: 431
Views: 28482

Re: BA 777 @ LHR

As long as they are drawing fuel and not sucking sir, the positive displacement engine driven pump is capable of developing 10 PSI or more vacuum. Enough to damage the wing. The damage would depend on the fuel level when the vents plugged. The boost pumps must be working correctly and fuel is avail...
by Gabriel
Tue Apr 22, 2008 11:32 am
Forum: Aviation Discussion Forum
Topic: Cessna 182...a SLICK airplane?
Replies: 32
Views: 2870

Re: Cessna 182...a SLICK airplane?

Ok.
by Gabriel
Tue Apr 22, 2008 2:45 am
Forum: Aviation Discussion Forum
Topic: Cessna 182...a SLICK airplane?
Replies: 32
Views: 2870

Re: Cessna 182...a SLICK airplane?

My point is that a 6 radial cylinders engine makes more drag than a 6 opposed cylinders engine of the same power even if both engines are air cooled.
by Gabriel
Tue Apr 22, 2008 2:33 am
Forum: Aviation Safety Discussion Forum
Topic: ISGPOTM grounded?
Replies: 4
Views: 902

Re: ISGPOTM grounded?

Civilization begins to unravel.... [...] The FedEx spokesman said GE altered the cargo carrier about problems related to engine parts [...] You bet GE altered FedEx when they alerted them about problems related to the engine parts. (Did I really pick a mistake in English, and by The Wall Street Jou...
by Gabriel
Tue Apr 22, 2008 2:22 am
Forum: Aviation Safety Discussion Forum
Topic: BA 777 @ LHR
Replies: 431
Views: 28482

Re: BA 777 @ LHR

Wouldn't the tanks (wing surface) implode/distort if the tank vents were blocked for whatever reason? I think you might run out of useable fuel before it got that far. Why? I tend to agree with Hyper. It shouldn't take a lot of differential pressure for the wing tank to start to collapse. And I kno...
by Gabriel
Mon Apr 21, 2008 4:38 am
Forum: Aviation Discussion Forum
Topic: Cessna 182...a SLICK airplane?
Replies: 32
Views: 2870

Re: Cessna 182...a SLICK airplane?

So the question is, why would liquid cooling be cleaner from an aerodynamic point of view? (I can only guess that maybe the heat exchange is much more efficient so much less air has to go through). That's a pretty good guess, Gabriel. Think P-51 vs P-47. I'm afraid I don't get it. If the pictures i...
by Gabriel
Mon Apr 21, 2008 4:29 am
Forum: Aviation Safety Discussion Forum
Topic: BA 777 @ LHR
Replies: 431
Views: 28482

Re: BA 777 @ LHR

In the sketchy diagram I posted some slots above I omitted a check valve immediately after each low pressure pump. Remember that this is what I understood about the fuel system from the explanations given in Internet forums. So a confirmation from Don would be in order. So how does the check valve ...
by Gabriel
Sun Apr 20, 2008 1:57 pm
Forum: Aviation Safety Discussion Forum
Topic: BA 777 @ LHR
Replies: 431
Views: 28482

Re: BA 777 @ LHR

Myself also don't want to finish your patience Don, but I will really appreciate your opinion on the cavitation damage: how often are the pumps checked and what is the possibility of the damage being made on a previous flight? Forgive me if I insist, but I am thinking that a partially damaged pump ...
by Gabriel
Sun Apr 20, 2008 1:54 pm
Forum: Aviation Safety Discussion Forum
Topic: BA 777 @ LHR
Replies: 431
Views: 28482

Re: BA 777 @ LHR

However, you did not respond to.....Quote Hypersonic "I am also interested in how air is prevented from entering the pickup should one of the pickups become uncovered (above fuel level) due to aircraft attitude and the relatively "flat" nature of the tanks. In the sketchy diagram I posted some slot...
by Gabriel
Sat Apr 19, 2008 8:13 pm
Forum: Aviation Discussion Forum
Topic: Cessna 182...a SLICK airplane?
Replies: 32
Views: 2870

Re: Cessna 182...a SLICK airplane?

The reason no cowl flaps were discussed is because they do not exist on the Diesel, it's liquid cooled. The engine cowling is aerodynamically cleaner giving the aircraft a different descent profile over the air-cooled version. Since I know very little about Diesel engines, be it in palnes, cars or ...
by Gabriel
Sat Apr 19, 2008 7:55 pm
Forum: Aviation Discussion Forum
Topic: Cessna 182...a SLICK airplane?
Replies: 32
Views: 2870

Re: Cessna 182...a SLICK airplane?

No it's not a glider, but sure beats the heck out of the space shuttle ;)
Yeah, evn the Tomahawk beats the space shuttle (barely) ;)
by Gabriel
Sat Apr 19, 2008 1:30 pm
Forum: Aviation Discussion Forum
Topic: Cessna 182...a SLICK airplane?
Replies: 32
Views: 2870

Re: Cessna 182...a SLICK airplane?

Is 140kts within the envelope of the flaps 10 config? And is 11:1 the glide ratio at 140kts and flaps 10? The answers to these questions would make a difference. 11:1 is not a very good (not very bad either) glide ratio for a clean airplane. At 80kts (if not exactly at least close to the best glide)...
by Gabriel
Thu Apr 17, 2008 5:17 am
Forum: Off Topic Forum
Topic: #3
Replies: 85
Views: 5018

Re: #3

Thank you all for your wishes and kindness.
by Gabriel
Wed Apr 16, 2008 11:39 am
Forum: Aviation Safety Discussion Forum
Topic: Bring on the lawyers!
Replies: 8
Views: 1039

Re: Bring on the lawyers!

It was only a matter of time...... ...................The "Contract of Carriage" on Southwest's website states: "All transportation is sold and all carriage is performed subject to compliance with all applicable laws and governmental regulations, including those of the U.S. Department of Transporta...
by Gabriel
Wed Apr 16, 2008 2:54 am
Forum: Aviation Safety Discussion Forum
Topic: BA 777 @ LHR
Replies: 431
Views: 28482

Re: BA 777 @ LHR

Being such a big aircraft, I doubt that throttle is controlled by wires (not even from the cockpit to the hydraulic controls/valves). My (very parlor style) bet: 1) Low voltage producing a situation where valves/controls are not responding immediately to the input (cabin crew was using all the powe...

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