Why Don't Commercial Aircraft...
Why Don't Commercial Aircraft...
Author
Discussion

Doofus

Original Poster:

34,279 posts

202 months

Tuesday 9th August 2016
quotequote all
Have more emergency exits?

callmedave

2,686 posts

174 months

Tuesday 9th August 2016
quotequote all
They are designed with a criteria that people must be able to evacuate within so many seconds. It will be build within these constraints.

Any extra just cost more.

TIGA84

5,581 posts

260 months

Tuesday 9th August 2016
quotequote all
What are you thinking, some kind of bi-fold solution, could run them the whole length of the plane, be a nice view!

Mr Will

13,719 posts

235 months

Tuesday 9th August 2016
quotequote all
Why stop there? Why not ejector seats? The mental image of 550 passengers being launched simultaneously out of an A380 is quite wonderful!

FourWheelDrift

92,234 posts

313 months

Tuesday 9th August 2016
quotequote all
Mr Will said:
Why stop there? Why not ejector seats? The mental image of 550 passengers being launched simultaneously out of an A380 is quite wonderful!
Especially those on the lower deck.

Bradgate

3,200 posts

176 months

Tuesday 9th August 2016
quotequote all
As was demonstrated very effectively by the Emirates crew who did such an outstanding job of evacuating the 777 which crash landed at Dubai last week, commercial aircraft have enough emergency exits.

Doofus

Original Poster:

34,279 posts

202 months

Tuesday 9th August 2016
quotequote all
I just don't see why they can't put another pair (1 left, 1 right) halfway between the front and the overwing doors, and another similar pair halfway between the wings and the back.

It won't add a lot of weight, and it won't significantly compromise rigidity, surely?

gibbon

2,182 posts

236 months

Tuesday 9th August 2016
quotequote all
Doofus said:
I just don't see why they can't put another pair (1 left, 1 right) halfway between the front and the overwing doors, and another similar pair halfway between the wings and the back.

It won't add a lot of weight, and it won't significantly compromise rigidity, surely?
Grab an empty coke can, twist it. Grab another, poke a few holes in the middle, twist again.

jamieduff1981

8,092 posts

169 months

Tuesday 9th August 2016
quotequote all
Each set of doors requires greater seat pitch too. 2 more sets of doors will probably cost, what, 6 seats? More? Even without considering the passengers who won't be onboard at Maximum Take Off Weight thanks to the weight of the doors. Those tickets will quickly add up to a lot of lost revenue for no reduction in operating cost.

RizzoTheRat

28,774 posts

221 months

Tuesday 9th August 2016
quotequote all
FourWheelDrift said:
Mr Will said:
Why stop there? Why not ejector seats? The mental image of 550 passengers being launched simultaneously out of an A380 is quite wonderful!
Especially those on the lower deck.
B-52 has downward ejection seats for some of the crew. I now have a mental image of an A380 looking a bit like that pic of a Hercules firing all it's flares biggrin

Mr Will

13,719 posts

235 months

Tuesday 9th August 2016
quotequote all
Doofus said:
I just don't see why they can't put another pair (1 left, 1 right) halfway between the front and the overwing doors, and another similar pair halfway between the wings and the back.

It won't add a lot of weight, and it won't significantly compromise rigidity, surely?
Every modern airliner can be fully evacuated in under 90 seconds. Do you really think two extra sets of doors would make a significant difference?

Wobbegong

15,078 posts

198 months

Tuesday 9th August 2016
quotequote all
RizzoTheRat said:
FourWheelDrift said:
Mr Will said:
Why stop there? Why not ejector seats? The mental image of 550 passengers being launched simultaneously out of an A380 is quite wonderful!
Especially those on the lower deck.
B-52 has downward ejection seats for some of the crew. I now have a mental image of an A380 looking a bit like that pic of a Hercules firing all it's flares biggrin
Side ejection system biggrin

J4CKO

46,813 posts

229 months

Tuesday 9th August 2016
quotequote all
RizzoTheRat said:
FourWheelDrift said:
Mr Will said:
Why stop there? Why not ejector seats? The mental image of 550 passengers being launched simultaneously out of an A380 is quite wonderful!
Especially those on the lower deck.
B-52 has downward ejection seats for some of the crew. I now have a mental image of an A380 looking a bit like that pic of a Hercules firing all it's flares biggrin
As half of the passengers are trying to grab stuff from the overhead bins on the way out.

Ali Chappussy

876 posts

174 months

Tuesday 9th August 2016
quotequote all
Mr Will said:
Every modern airliner can be fully evacuated in under 90 seconds. Do you really think two extra sets of doors would make a significant difference?
It'll mean the idiots will have more opportunity to save their hand luggage and duty free.

Doofus

Original Poster:

34,279 posts

202 months

Tuesday 9th August 2016
quotequote all
Mr Will said:
Every modern airliner can be fully evacuated in under 90 seconds. Do you really think two extra sets of doors would make a significant difference?
I do if everybody wants to collect their bags from the overhead on the way out, yes.

I have flown a lot in the past. A lot. I've only had two emergency evacs, though, and in both cases they went well, because they were business flights, populated by people who could tie their own shoelaces, and knew how to behave sensibly. These days, the majority of my flights are with people in beachwear who go through life with a sense of entitlement, and given most of them are a sight fatter than me, and won't respond to pushing, I really doubt that 90 second target is could be achieved.

Mr Will

13,719 posts

235 months

Tuesday 9th August 2016
quotequote all
Doofus said:
Mr Will said:
Every modern airliner can be fully evacuated in under 90 seconds. Do you really think two extra sets of doors would make a significant difference?
I do if everybody wants to collect their bags from the overhead on the way out, yes.

I have flown a lot in the past. A lot. I've only had two emergency evacs, though, and in both cases they went well, because they were business flights, populated by people who could tie their own shoelaces, and knew how to behave sensibly. These days, the majority of my flights are with people in beachwear who go through life with a sense of entitlement, and given most of them are a sight fatter than me, and won't respond to pushing, I really doubt that 90 second target is could be achieved.
Here's a good tale from the testing of the A380: https://www.flightglobal.com/news/articles/airbus-...

78 seconds using only half the slides.

More doors will only add more confusion.


Steve_D

13,801 posts

287 months

Tuesday 9th August 2016
quotequote all
Mr Will said:
......More doors will only add more confusion.
And require more crew to man them.

Steve

mph1977

12,467 posts

197 months

Tuesday 9th August 2016
quotequote all
Nanook said:
Doofus said:
Have more emergency exits?
Holes in longitudinally effective structure cost weight, strength and stiffness.

I design ships, not planes, but it's why we keep external openings to a minimum.
basically you have to trade off the number of openings in what, after all, is a large pressure vessel built as light as can be got away with - more exits = more weight

IforB

9,840 posts

258 months

Wednesday 10th August 2016
quotequote all
Doofus said:
Have more emergency exits?
It's quite simple, we don't need any more than we have already.

Beyond Rational

3,544 posts

244 months

Wednesday 10th August 2016
quotequote all
In the event of a fire, they should just eject the hand luggage onto the runway. That'll get the passengers outside.