The official aviation quiz topic!

MD-11 · Post by **MD-11** » 30 Dec 2005, 22:50

MD-11 wrote:a) What does it mean when the left bar is red and the right bar is green?
b) What does the pilot have to do?

a) Plane is left of center line.
b) turn towards green
Since Koen was the only one trying I'll give the credit to him.
Your turn, Koen

realplaneshaveprops · Post by **realplaneshaveprops** » 31 Dec 2005, 15:49

Here is my question:

Before it was Chicago O'Hare airfield, the site was used for something else.

What was it?
Who used it?

Happy new year!!!!!

Koen

MD-11 · Post by **MD-11** » 31 Dec 2005, 16:06

Plane factory
The US military

realplaneshaveprops · Post by **realplaneshaveprops** » 31 Dec 2005, 16:10

Correct, it was used bu Douglas and US military for building the C-54's.

To keep up with the orders (during 1942 Douglas had an order of 1.335 C-47s as well to consider, plus numerous others for other types) another factory was built on the site of what is now Chicago O'Hare Airport. Nearly two-thirds of all the C-54s were to be produced here.

You're turn MD-11

Koen

MD-11 · Post by **MD-11** » 05 Jan 2006, 09:49

If flying trough volcanic ash 7 steps have to be taken ( according to the B737 quick reference handbook ).
I'll give the 7 items and you have to fill in what to do with them

Thrust levers:

Autothrottle ( if engaged ):

Engine start switches:

Pack switches:

Wing anti-ice:

Engine anti-ice:

APU ( if available ):

Good luck!

Avro · Post by **Avro** » 06 Jan 2006, 22:14

Thrust levers:

at idle (if possible of course

otherwise as slow as possible )

Autothrottle ( if engaged ):

disconnect

Engine start switches:

Put the ignition on -> continuously igniting

Pack switches:

at full power

(bleed system fully open)

Wing anti-ice:

on (cause bleed system full on)

Engine anti-ice:

on (cause bleed system full on)

APU ( if available ):

starting APU when cleared of ash cloud

And a final advisory, if ever you encounter an ash cloud try to come out of it asap (even by doing a 180° turn) and don't try to fly over it.

Chris

MD-11 · Post by **MD-11** » 08 Jan 2006, 18:28

Perfect answer Chris, your turn

Avro · Post by **Avro** » 08 Jan 2006, 18:35

When looking at the tail cone shape of the B757 and of the B747 we can see a big difference. The tail cone of the B757 is more symmetrical while the tail cone of the B747 is asymmetrical.

What is the main advantage of having a symmetrical tail cone ? And what is one of its main drawbacks (if we can call it a real drawback..) ?

Chris

EDIT: I changed my question.

realplaneshaveprops · Post by **realplaneshaveprops** » 08 Jan 2006, 19:21

Is it something with the area-rule?

Koen

Avro · Post by **Avro** » 08 Jan 2006, 19:27

Area rule ?

realplaneshaveprops · Post by **realplaneshaveprops** » 08 Jan 2006, 23:19

The area rule is an important concept related to the drag on an aircraft or other body in transonic and supersonic flight. The area rule came into being in the early 1950s when production fighter designs began pushing ever closer to the sound barrier. Designers had found that the drag on these aircraft increased substantially when the planes traveled near Mach 1, a phenomenon known as the transonic drag rise illustrated below. This increase in drag is due to the formation of shock waves over portions of the vehicle, which typically begins around Mach 0.8, and this drag increase reaches a maximum near Mach 1. Because of its source, this type of drag is referred to as wave drag.

The conclusion was that shaping the vehicle to create a smooth cross-sectional area distribution from the nose to the tail could drastically reduce the drag on an aircraft. The area rule tells us that the volume of the body should be reduced in the presence of a wing, tail surface, or other projection so that there are no discontinuities in the cross-sectional area distribution of the vehicle shape.

So I meant that the tail cone shape was so to allow a smooth cross sectional area distribution to the end of the aircraft.

Koen

Avro · Post by **Avro** » 09 Jan 2006, 18:33

More or less ok. Now I need a drawback

realplaneshaveprops · Post by **realplaneshaveprops** » 09 Jan 2006, 22:29

Less space for the APU and other systems?

Koen

Avro · Post by **Avro** » 10 Jan 2006, 20:46

Well I don't think that there would be less space for the APU and other equipment. The upper part will indeed have a downward slope but the lower will not have a slope as steep as on other planes.

It has to do with the slope of the lower part

Chris

fokker_f27 · Post by **fokker_f27** » 10 Jan 2006, 21:09

Wild guess: less friction during takeoff?
I know it's wrong, but there's always a chance.

realplaneshaveprops · Post by **realplaneshaveprops** » 10 Jan 2006, 21:25

Higher risk of a tail strike?

Koen

Avro · Post by **Avro** » 10 Jan 2006, 23:10

fokker_f27 wrote:Wild guess: less friction during takeoff?
I know it's wrong, but there's always a chance.

yes it's wrong

Higher risk of a tail strike?

Correct Koen.

The B757 was developed in a time during the oil crisis and everything was done to reduce the drag. By shaping the tail cone as a symmetrical body the drag was reduced but the drawback of this design was the higher tailstrike risk since the slope of the lower part of the fuselage is less.

Chris

realplaneshaveprops · Post by **realplaneshaveprops** » 11 Jan 2006, 15:55

Containers and pallets are build as standard equipment, so they can be used all around the world. But only 3 types are designed specially for Boeing.

I want to hear from the winner the following things:
- Types of containers or pallets
- Dimensions of containers or pallets
- The Boeing types, they were designed for?

Good luck

Koen

Avro · Post by **Avro** » 11 Jan 2006, 20:43

LD1 64" (H) 92"(L) 60.4"(W) 171 ft³ -> designed for the B747

LD2 47"BW / 62"W x 60.4"D x 64"H 120 ft³ -> designed for B767

LD8 96"BW / 125"W x 60.4"D x 64"H 243 ft³ -> also designed for the B767

Chris

realplaneshaveprops · Post by **realplaneshaveprops** » 11 Jan 2006, 22:22

correct Avro, you're next!!!

http://en.wikipedia.org/wiki/Unit_Load_Device

Koen