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Search: Posts Made By: HazelNuts39
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Forum: Questions
16th Aug 2013, 08:55
Replies: 50
Views: 9,379
Posted By HazelNuts39

As an illustration to my post #49, I thought the...

As an illustration to my post #49, I thought the following graph might be interesting. It shows the variation of lift-to-drag ratio (L/D) with airspeed.

For example at 1.4 times the minimum drag...
Forum: Questions
11th Aug 2013, 07:05
Replies: 50
Views: 9,379
Posted By HazelNuts39

Energy is the sum of kinetic and potential...

Energy is the sum of kinetic and potential energy:
½*m*V² + m*g*H
where m = mass, V = velocity, g = acceleration of gravity, and H = height.

So for two points 1 and 2 of equal energy, we get: H2...
Forum: Questions
8th Aug 2013, 15:15
Replies: 50
Views: 9,379
Posted By HazelNuts39

At Vref drag is proportional to mass, and since...

At Vref drag is proportional to mass, and since thrust is close to zero, the NM/1000' does not change appreciably with mass.

Kinetic and potential energy are both proportional to mass, so the...
Forum: Questions
6th Aug 2013, 07:35
Replies: 50
Views: 9,379
Posted By HazelNuts39

Grrr I can't see any reason why an FMS would not be...

I can't see any reason why an FMS would not be able to accurately predict the descent profile in a perfect atmosphere, The problem is that the FMS does not know the changes in wind that lie ahead.
...
Forum: Questions
5th Aug 2013, 12:58
Replies: 50
Views: 9,379
Posted By HazelNuts39

BOAC, Not sure why you're asking and how...

BOAC,

Not sure why you're asking and how much detail you are interested in, but:

I was looking for the longest interval where the engines were at idle (or almost) and the RoD and deceleration...
Forum: Questions
5th Aug 2013, 09:25
Replies: 50
Views: 9,379
Posted By HazelNuts39

I'm so sorry. I thought that if you had...

I'm so sorry. I thought that if you had understood the explanation I gave in previous posts you would be able to see the relation between L / D and RoD.

The following graph shows for the 737-800...
Forum: Questions
4th Aug 2013, 17:16
Replies: 50
Views: 9,379
Posted By HazelNuts39

The beauty of JT's 1/1000 is that it doesn't need...

The beauty of JT's 1/1000 is that it doesn't need a whizz-wheel.

'nuff said ...
Forum: Questions
4th Aug 2013, 10:03
Replies: 50
Views: 9,379
Posted By HazelNuts39

It doesn't need to because it has a different...

It doesn't need to because it has a different purpose. It is a manoeuvre limit that is not based on performance capability.

My understanding of the original question is that it is a performance...
Forum: Questions
4th Aug 2013, 09:37
Replies: 50
Views: 9,379
Posted By HazelNuts39

From your post #13: The point is that...

From your post #13:


The point is that this limit does not define the RoD achieved at constant airspeed by a particular airplane, in a particular configuration, at a particular speed, at idle...
Forum: Questions
4th Aug 2013, 08:51
Replies: 50
Views: 9,379
Posted By HazelNuts39

Green dot?

Green dot?
Forum: Questions
4th Aug 2013, 08:32
Replies: 50
Views: 9,379
Posted By HazelNuts39

So what would be your figure for the clean...

So what would be your figure for the clean aircraft?
Forum: Questions
4th Aug 2013, 06:46
Replies: 50
Views: 9,379
Posted By HazelNuts39

BOAC, Is your figure based on any...

BOAC,

Is your figure based on any configuration in particular?
Forum: Questions
3rd Aug 2013, 17:11
Replies: 50
Views: 9,379
Posted By HazelNuts39

It 'worked out really fine' for the B727. Would...

It 'worked out really fine' for the B727. Would it work out equally well for a B737?
Forum: Questions
3rd Aug 2013, 14:56
Replies: 50
Views: 9,379
Posted By HazelNuts39

Hi John, Not really, we're discussing:...

Hi John,



Not really, we're discussing:
(a) steep descent prior to conducting a normal ILS or similar.

We just have three gradients in reply to the original post:

BOAC: 0.78 NM/1000 ft
Forum: Questions
30th Jul 2013, 20:58
Replies: 50
Views: 9,379
Posted By HazelNuts39

The point that I'm making is that full flaps,...

The point that I'm making is that full flaps, gear down, idle thrust at 140 kts will give you a steady rate of descent of 2200 fpm.

At 3000 fpm your KE will increase at the rate of 68 kt per...
Forum: Questions
30th Jul 2013, 18:07
Replies: 50
Views: 9,379
Posted By HazelNuts39

EDIT:: In those 27 seconds the RoD was...

EDIT::


In those 27 seconds the RoD was approximately constant at 11.11 fps. At the average airspeed of 115 kts the flight path gradient was 5.72 % (3.28 degrees).

The airspeed dropped at an...
Forum: Questions
30th Jul 2013, 17:26
Replies: 50
Views: 9,379
Posted By HazelNuts39

We'll have to differ then. The performance of the...

We'll have to differ then. The performance of the 737 demonstrated in the accident is quite similar to that of the aircraft I referred to, i.e. an L/D of around 6.5 in the landing configuration at...
Forum: Questions
30th Jul 2013, 15:48
Replies: 50
Views: 9,379
Posted By HazelNuts39

BOAC - Having been involved with qualifying...

BOAC - Having been involved with qualifying aircraft for steep approach, I too thought it was steep. What do you do to descend more steeply than THY at idle?
Forum: Questions
30th Jul 2013, 13:08
Replies: 50
Views: 9,379
Posted By HazelNuts39

3000fpm @ 140kts - does that qualify as a steep...

3000fpm @ 140kts - does that qualify as a steep approach?

(THY at AMS didn't quite achieve that level of performance:
It went from 140 kts @ 700 ft to 90 kts @ 400 ft in 27 seconds in LDG config...
Showing results 1 to 19 of 19


 
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