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Search: Posts Made By: CabinMaster
Showing results 1 to 35 of 41
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Forum: Tech Log
14th Nov 2010, 15:54
Replies: 5
Views: 2,365
Posted By CabinMaster

@Slasher All data you need as suicide bomber...

@Slasher
All data you need as suicide bomber can be found in flight manuals, which are easy to download. Detailed engineering stuff is usually of no use for "destructive" purposes.

@golball59
I...
Forum: Tech Log
14th Nov 2010, 10:18
Replies: 5
Views: 2,365
Posted By CabinMaster

Hilarious. You want to create an A320-Model...

Hilarious. You want to create an A320-Model (apparently some mix of flight simulator and performance model) and have not thought about data before?
Actually, flight simulation is simple, the data is...
Forum: Rumours & News
5th Nov 2010, 09:17
Replies: 59
Views: 36,798
Posted By CabinMaster

Difficult to identify by the reg, as the airline...

Difficult to identify by the reg, as the airline has several ATR72s with pretty much the same registration:

453 (http://www.airfleets.net/ficheapp/plane-atr-453.htm) 72-212 08/03/2006 ...
Forum: Tech Log
28th Oct 2010, 12:32
Replies: 5
Views: 1,279
Posted By CabinMaster

Economy seats cost up to 20000 USD for a triple...

Economy seats cost up to 20000 USD for a triple (so ~7k per seat). Large variation is present, with the cheapest being less than 50% of the most expensive. Also: you have huge differences in the...
Forum: Tech Log
28th Oct 2010, 12:27
Replies: 24
Views: 16,348
Posted By CabinMaster

My guess: Droop aileron combined with roll...

My guess: Droop aileron combined with roll command.
Did this kind of "differential aileron" ever happen in clean configuration?
Forum: Tech Log
27th Oct 2010, 07:40
Replies: 15
Views: 3,432
Posted By CabinMaster

The turboprop is less susceptible to lower...

The turboprop is less susceptible to lower altitudes. That's why turbo props rule on short range. It is both due to optimization of the designs at hand, and due to the physical limitations of a prop....
Forum: Tech Log
26th Oct 2010, 20:13
Replies: 13
Views: 5,350
Posted By CabinMaster

No, you do not understand correctly. Cruise...

No, you do not understand correctly.

Cruise altitude is limited by aircraft performance. The "optimal" cruise altitude (lowest fuel burn) is usually the highest possible.

Cruise altitude is...
Forum: Tech Log
25th Oct 2010, 08:50
Replies: 18
Views: 2,703
Posted By CabinMaster

But the document says: For Cost Index =...

But the document says:


For Cost Index = 0, IAS Econ is maximum rate of climb.

For higher cost index the airspeed is increased up to VMO-10.
Forum: Tech Log
24th Oct 2010, 17:42
Replies: 18
Views: 2,703
Posted By CabinMaster

Rate of Climb = (Thrust - Drag)/Weight * True...

Rate of Climb = (Thrust - Drag)/Weight * True Airspeed

Assuming that thrust is always the same (not depending on weight), we have to minimize the drag.

Drag can be described as:
Drag = [CD0 +...
Forum: Tech Log
24th Oct 2010, 08:20
Replies: 18
Views: 2,703
Posted By CabinMaster

Haven't seen anything similar in A320 or A330...

Haven't seen anything similar in A320 or A330 manual. Maybe its not there. Maybe someone knows. From the physical perspective, higher weights will have higher green dot speed (best glide ratio). But...
Forum: Tech Log
23rd Oct 2010, 15:35
Replies: 18
Views: 2,703
Posted By CabinMaster

Depends, only if you chose "minimum fuel climb". ...

Depends, only if you chose "minimum fuel climb".

From what I know (and that may not be much) aircraft usually climb "best profile". For an A320 that is 250kts below 10000ft (due to aTC...
Forum: Tech Log
23rd Oct 2010, 10:28
Replies: 46
Views: 50,963
Posted By CabinMaster

Flight performance means different weights,...

Flight performance means different weights, altitudes and some other parameters. Excel is limited to 2D-matrices.
For example: I want to calculate Rate of Climb for a given weight over the entire...
Forum: Tech Log
23rd Oct 2010, 10:18
Replies: 18
Views: 2,703
Posted By CabinMaster

Climb and Cruise speeds are the same, at least...

Climb and Cruise speeds are the same, at least for a jet that cruises above cross-over altitude. The less well known "green dot speed" changes with weight.
Forum: Tech Log
21st Oct 2010, 21:29
Replies: 46
Views: 50,963
Posted By CabinMaster

TSFC also increases with lower throttle settings....

TSFC also increases with lower throttle settings.
TSFC is actually quite complex. And we have to keep in mind: TSFC is no physical value, it is simply fuel flow divided by thrust. Sometimes it can...
Forum: Tech Log
21st Oct 2010, 12:46
Replies: 26
Views: 15,253
Posted By CabinMaster

Is it possible for an Airbus to start the APU at...

Is it possible for an Airbus to start the APU at any altitude? Ia always though that APU start can only be done below 25k pressure altitude.
Forum: Tech Log
18th Oct 2010, 20:06
Replies: 15
Views: 3,432
Posted By CabinMaster

I just checked 170t gross weight, FL310 versus...

I just checked 170t gross weight, FL310 versus FL370, Mach 0.8.
Difference in fuel flow is 16.9%, so in line with the numbers I previously provided.

The slight difference is due to the different...
Forum: Tech Log
18th Oct 2010, 18:45
Replies: 0
Views: 1,231
Posted By CabinMaster

Yet More ATR72 Performance Questions

Hi everyone,

I am still on the hunt for good ATR72 performance data. This time I am a bit wondering about the real life performance.

In a marketing brochure the range of the ATR72-500 with 70...
Forum: Tech Log
18th Oct 2010, 16:39
Replies: 15
Views: 3,432
Posted By CabinMaster

Using FCOM of A330-300 (Lufthansa, PW engines),...

Using FCOM of A330-300 (Lufthansa, PW engines), assuming again 2000nm distance to destination and FL310 instead of FL370 (this quietly assumes that FL370 can be reached at current gross weight), the...
Forum: Tech Log
18th Oct 2010, 15:45
Replies: 15
Views: 3,432
Posted By CabinMaster

A319 with CFM56-5B engines: Using In-Cruise...

A319 with CFM56-5B engines:

Using In-Cruise Quick Check table of the FCOM:
2000nm to go, when you want to cruise FL370 but can only fly FL310, you'll burn 9820kg instead of 9045kg. That is 8.6%...
Forum: Tech Log
10th Oct 2010, 11:16
Replies: 19
Views: 4,110
Posted By CabinMaster

Best gust response comes when you have very high...

Best gust response comes when you have very high wing loading and very flat lift curve slope. See: Tornado IDS or F-111.
As correctly pointed out, Gust Load Alleviation is done to drive down wing...
Forum: Tech Log
10th Oct 2010, 11:10
Replies: 6
Views: 4,343
Posted By CabinMaster

I think the A330-200 will beat the B777-300ER...

I think the A330-200 will beat the B777-300ER anytime in costs per seat when 250 people want to fly A to B. ;)
Forum: Tech Log
6th Oct 2010, 06:07
Replies: 13
Views: 2,046
Posted By CabinMaster

I guess the reason is to have some margin against...

I guess the reason is to have some margin against the flap set limit airspeed, in case of gust. Not sure, does the B737 have a Flap Load Relief system?
Forum: Tech Log
6th Oct 2010, 06:02
Replies: 28
Views: 8,148
Posted By CabinMaster

This sounds like you have no idea at all. ...

This sounds like you have no idea at all.

For starters: the B-52G & H don't even have ailerons, they use spoilers exclusively for Roll Control.

Getting an aerodynamic model with sufficient...
Forum: Tech Log
4th Oct 2010, 20:05
Replies: 16
Views: 10,401
Posted By CabinMaster

First, I was wrong on the sea level...

First, I was wrong on the sea level compressibility effect on IAS/CAS, "rivet gun" is right.
For CAS/IAS (I am putting these together as modern airliners usually have no mean to see the difference...
Forum: Tech Log
4th Oct 2010, 15:56
Replies: 14
Views: 5,328
Posted By CabinMaster

Or he uses a different unit. The answer is...

Or he uses a different unit.
The answer is always "42".
Just the unit changes.
Forum: Tech Log
4th Oct 2010, 14:54
Replies: 16
Views: 10,401
Posted By CabinMaster

Let's rather say the Airbus is limited by its VMO...

Let's rather say the Airbus is limited by its VMO at lower altitudes, so it cannot run into regions where compressibility is an issue. A faster aircraft would experience the same CAS/EAS disagree at...
Forum: Tech Log
4th Oct 2010, 11:26
Replies: 14
Views: 5,328
Posted By CabinMaster

g still is approximately 9.81 m/sē.

g still is approximately 9.81 m/sē.
Forum: Tech Log
4th Oct 2010, 09:43
Replies: 14
Views: 5,328
Posted By CabinMaster

You want to calculate turn radius? That is a...

You want to calculate turn radius?
That is a pure function of turn acceleration and level flight speed (true). It is the acceleration you actually put in the turn.
It is no problem to separate...
Forum: Flight Testing
3rd Oct 2010, 09:47
Replies: 14
Views: 12,634
Posted By CabinMaster

Supersonic tip speeds are not a fatal show...

Supersonic tip speeds are not a fatal show stopper. They increase noise quite a bit. Maybe that explains the characteristic noise of the Bear.
A propeller blade is like a wing: it produces lift and...
Forum: Tech Log
3rd Oct 2010, 09:03
Replies: 22
Views: 8,613
Posted By CabinMaster

Thanks for the input. Propeller is the biggest...

Thanks for the input. Propeller is the biggest issue.
Simulating an installed turbo-prop is much more difficult than a turbo-fan.

By the way, as your username is Tu-114: do you have any...
Forum: Tech Log
2nd Oct 2010, 23:03
Replies: 22
Views: 8,613
Posted By CabinMaster

I assume that basic engine architecture is...

I assume that basic engine architecture is similar. So the value might be scalable. Anyways, I just need a rough guess to check versus the ATR72 Descent table. I am using SFC-based engine model,...
Forum: Tech Log
2nd Oct 2010, 17:01
Replies: 22
Views: 8,613
Posted By CabinMaster

Thanks. By the way: the ATR72-500 has an...

Thanks.
By the way: the ATR72-500 has an effective top speed of 280 KTAS at 18t gross weight. Burns 360kg/(hr & ENG). More efficient at same weight is flying at max altitude, achieving 266 KTAS at...
Forum: Tech Log
2nd Oct 2010, 16:15
Replies: 16
Views: 4,135
Posted By CabinMaster

Roll Acceleration = Roll Moment / Roll Inertia ...

Roll Acceleration = Roll Moment / Roll Inertia

Roll Moment: produced by ailerons, limited by wing flex (especially high aspect) and local maximum lift coefficient. More span adds more Rolling...
Forum: Tech Log
2nd Oct 2010, 16:04
Replies: 40
Views: 11,771
Posted By CabinMaster

I think only military transports can do this,...

I think only military transports can do this, take the Transall for example:
Transall C-160 ? Wikipedia (http://de.wikipedia.org/wiki/Transall_C-160) (German, has take-off distance)
Transall C-160...
Forum: Tech Log
2nd Oct 2010, 16:01
Replies: 24
Views: 20,846
Posted By CabinMaster

Did you put similar doors on all four exit...

Did you put similar doors on all four exit locations?
Usually the A321 uses smaller Type I exits at 2nd and 3rd exit lane, enlarged exits at 2nd exit lane are options.
Showing results 1 to 35 of 41
 
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