Jump to content

Question of the day


Recommended Posts

OK; with the assumption that jet engines produce more thrust at lower temps, when the pilot enters the outside temp of 54 Celcius into the FMC, the computer would then calculate a lowered thrust of over 25% for the engines to compensate for take off...at full load, may not be enough thrust to adequately take off with the given runway!

Link to comment
Share on other sites

  • Replies 67
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

They can take off, but at those numbers they would probably have to fly empty or with not enough fuel for the trip. Therefore simple economics rule.

What's the point in flying if you aren't making money?

Link to comment
Share on other sites

They cant take off because the crew is on the beach sipping they frappe :lol::lol::lol:

LOL, Actually, with it being so hot, we would be back at the hotel with the air conditioner running at full blast taking a nap and hopping that the night would bring cooler temps!

Other then that I’m going to stay out of it per Mathijs’s request.

Link to comment
Share on other sites

As it's so hot the rubber padding where the airbridges touch the aircraft have begun melting which now leaves "foreign bodies" on the fuselage. So after being forced to remove the airbridges there is no boarding; no boarding = no flight. :D

Link to comment
Share on other sites

54 degrees... That's a temperature people can't survive, if I remember correctly. Of course you can't take off with such temperatures! The pilots will not be able to function normally, or they would have to use air conditioning, but the system would have to perform so much cooling that it'll require FAR too much fuel. That will make the cost of trip far too expensive to have a good price, so either they charge the passengers more (which is a grand "no") or the loose bigtime on the flight (which is also a "no").

It's my guess that airlines will not let their aircraft takeoff, simply because it's no good operating temperature for the pilots themselves. You can't possibly demand people to perform intensive work at that temperature, and even with air conditioning, as I said, you'd be burning too much fuel to make the flight affordable (let alone the detrimental effects on the distance you can fly!).

I just looked it up to be sure: it seems people can not survive temperatures above 45 degrees for too long. The body just can't take it. Muscles will become rigid at between 45-50 degrees, and eventually, at 54 degrees, the entire body will be rigid. Because of that, you can't breath, and you'll suffocate. So, as you can see, at 54 degrees, the pilots die. And again, even when using air conditioning, you'd burn gallons of fuel: the cost of the trip would far outweigh the profit! This basically means that any company that isn't huge and doesn't have great profits anyway, will not be able to operate: meaning just about all airlines will have to keep their planes on the ground.

I realized I just said the same thing three times... Oh well.

Link to comment
Share on other sites

A bit simlar as Habit's post but maybe something with single engine procedures? If one of two engines fail the temperature of the remaining engine will rise so high that the engine gets overheated and the pilot has to retard the thrust resulting in that the engine won't produce enough thrust?

Link to comment
Share on other sites

Viewing A330 performance out of DXB wjere conditions could happen..the only reason i could suggest is that full thrust take-off is required, as temp is higher than Tref.. so i would guess the ones that can't take off are too heavy, which at DXB would be A330 that weight more than 200 tonnes

steve

Link to comment
Share on other sites

My 2 bob. Is it because if you enter the max temperature into the FMC at 54/55C you can only get the maximum thrust reduction of 25%, meaning there wouldn't be enough power to take off as a jet engine produces more thrust in cooler temperatures. In other words you simply don't have enough power to take off, specially fully loaded. Or not lol

Link to comment
Share on other sites

The added heat means the engines aren't able to run high because they will overheat quicker. Preformance charts don't go up that high. FMC won't recognise temperature. Aircraft aren't certified to fly in temps of 54 degrees plus, due to the raerity of the temp why would the manufacturer go to the trouble of certifying it at unresonable tepms?

Link to comment
Share on other sites

After doing some testing I've found that at 54C the time and distance to V1 in a 47-4 is about 8,000 feet, time to Rotation is around 10,000 feet and the time to V2: 3 Miles, the climb speed is also reduced substantially too.

After testing with the Default 172 I've found some quite interesting things: At the Lowest Air Temp that FSX will alow (Same for the Dew Point) the take off speed was reached quite fast and when the Temps got set to the highest FSX would alow (Again Dew Points Flipped too) the engine actually quit on me at those temps and had to restarted, the rotation speed took much longer to reach (It was hot enough that I had to lean the Mix at Sea Level) :blink:

Link to comment
Share on other sites

Guest
This topic is now closed to further replies.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. Privacy Policy & Terms of Use