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by Jetlagged
Sun Feb 06, 2005 7:38 am
Forum: Technical/Operations
Topic: Captains Only For Taxiing?
Replies: 19
Views: 4767

RE: Captains Only For Taxiing?

The A320 has a tiller for both pilots. I can't recall if they are mechanically linked, but there is no override switch as per the sidestick. See the picture below. The F/O tiller is just to the right of the sidestick. <br><center><font color="#EEEEEE" size="1" face="ARIAL, Helvetica, Geneva"><a href...

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by Jetlagged
Sun Feb 06, 2005 7:15 am
Forum: Technical/Operations
Topic: Thrust Reversers
Replies: 13
Views: 8214

RE: Thrust Reversers

On a Boeing, selecting reverse thrust will automatically deploy the speedbrake too. So if you forget to arm it, or it disarms inadvertently, selecting even idle reverse will ensure the speedbrake is deployed. Many years ago it was common for full reverse to be deployed on landing. The advent of carb...

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by Jetlagged
Thu Jan 27, 2005 3:18 pm
Forum: Technical/Operations
Topic: Forces On Flight Surfaces
Replies: 15
Views: 2880

RE: Forces On Flight Surfaces

My calculation had an error, in that I was not allowing for the angle of the spoiler, just it's projected area. This overestimated the force on the panel by a factor of two. FredT and Vikkyvik's approach of resolving velocity first is equally valid. FredT's estimate of 1g deceleration sounds too hig...

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by Jetlagged
Thu Jan 27, 2005 1:57 pm
Forum: Technical/Operations
Topic: Fuel In The Wings Question
Replies: 44
Views: 16331

RE: Fuel In The Wings Question

Regarding Slamclick's question about aircraft that can take off with fuel in the tail. Concorde could, with fuel in tank 11, the aft trim tank in the tail.

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by Jetlagged
Thu Jan 27, 2005 1:33 pm
Forum: Technical/Operations
Topic: Any Radar In Cockpit Other Than Weather Radar?
Replies: 98
Views: 11079

RE: Any Radar In Cockpit Other Than Weather Radar?

<b>distance = speed * time</b> In this case the time taken is for a round trip, so we are interested in half that time: <b>radio altitude = 0.5 * speed * time</b> Time is proportional to frequency difference. Let the constant of proportionality be k. <b>time = k * (frequency difference)</b> Substitu...

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by Jetlagged
Wed Jan 26, 2005 5:10 pm
Forum: Technical/Operations
Topic: Any Radar In Cockpit Other Than Weather Radar?
Replies: 98
Views: 11079

RE: Any Radar In Cockpit Other Than Weather Radar?

We all know a lot more about pedantry too.

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by Jetlagged
Wed Jan 26, 2005 3:38 pm
Forum: Technical/Operations
Topic: 747 Cockpit Location Vs. A380 Cockpit Location
Replies: 9
Views: 15107

RE: 747 Cockpit Location Vs. A380 Cockpit Location

Not sure about the common eye height with the A330/A340. The A380 cockpit is situated between the lower and upper decks, so the A380 lower deck would have to be lower relative to the deck of an A330/A340. However, I believe the A380 cockpit window configuration is common with the A330/A340. So the c...

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by Jetlagged
Wed Jan 26, 2005 3:05 pm
Forum: Technical/Operations
Topic: A350 Engine Swapping
Replies: 18
Views: 3272

RE: A350 Engine Swapping

Common pylon interface is a good idea for Boeing, so why not Airbus I wonder? Simple, the 7E7 is a clean sheet of paper, the A350 is a derivative. Airbus don't want to redesign their pylons, so will live with the different types already used on the A330. Also physically changing an engine is only pa...

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by Jetlagged
Wed Jan 26, 2005 1:43 pm
Forum: Technical/Operations
Topic: A320 Throttles
Replies: 17
Views: 10746

RE: A320 Throttles

On the Boeings, lifting the reverse lever signals the reverser to move. There's a mechanical interlock which prevents further lever movement until the reverser is fully deployed. Then you can apply full reverse thrust. A similar interlock prevents you applying forward thrust until the reverser is fu...

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by Jetlagged
Sun Jan 23, 2005 6:51 pm
Forum: Technical/Operations
Topic: 747 Cockpit Location Vs. A380 Cockpit Location
Replies: 9
Views: 15107

RE: 747 Cockpit Location Vs. A380 Cockpit Location

On the other hand the A380 has a fly-by-wire cockpit, which might make it feasible to hinge the entire forward section to gain nose loading access. Not sure nose access will be necessary though. A side cargo door should be large enough for everything except very long loads. A lot of 747 freighters a...

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by Jetlagged
Sun Jan 23, 2005 6:13 pm
Forum: Technical/Operations
Topic: Forces On Flight Surfaces
Replies: 15
Views: 2880

RE: Forces On Flight Surfaces

Vikkyvik, your calculations are a bit on the low side. Firstly, to compute dynamic pressure you need to square the aircraft true airspeed, not square half the velocity. Secondly 100 m/s is a bit low for 5,000 m altitude. If the IAS is 250 knots (288 mph), the true airspeed would be around 163 m/s. Y...

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by Jetlagged
Sun Jan 23, 2005 5:00 pm
Forum: Technical/Operations
Topic: A320 Throttles
Replies: 17
Views: 10746

RE: A320 Throttles

As you raise the reverse levers, the throttles move back slightly from the forward idle stop (marked 0 on the pedestal) to the reverse idle stop (where the yellow markings begin). They are mechanically interlinked. When the reverse levers are fully raised you are in reverse idle and are able to move...

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by Jetlagged
Sun Jan 23, 2005 3:51 pm
Forum: Technical/Operations
Topic: Any Radar In Cockpit Other Than Weather Radar?
Replies: 98
Views: 11079

RE: Any Radar In Cockpit Other Than Weather Radar?

I think both slamclick and airplay have valid points. The principle of the radio altimeter is based on the speed of light (and hence radio waves) being constant, so the time taken for a signal to reflect back is proportional to altitude. I doubt airplay would contest that. If you were to sit down wi...

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