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Search: Posts Made By: pstaney
Showing results 1 to 35 of 41
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Forum: Tech Log
3rd Jul 2007, 14:47
Replies: 9
Views: 7,171
Posted By pstaney

Old Smokey, For 100 kts headwind I get 100/20 =...

Old Smokey, For 100 kts headwind I get 100/20 = 5 times .01 = .05 mach. plus .835 = .885 mach.

Would that be .001 mach per 20 kts wind? But even that seems awfully small increment for a...
Forum: Tech Log
1st Jul 2007, 15:29
Replies: 9
Views: 7,171
Posted By pstaney

"The ECON mode of the FMS uses the inputted CI...

"The ECON mode of the FMS uses the inputted CI value together with the wind values to calculate the cruise speed."

Mutt, so using your suggested CI of 75, what calculated cruise speed spread would...
Forum: Tech Log
1st Jul 2007, 11:59
Replies: 9
Views: 7,171
Posted By pstaney

Mutt, would your company adjust it for wind? For...

Mutt, would your company adjust it for wind? For eg 100 kt H/W versus 100 kt T/W. I'm thinking the cost savings would be significant over flying at CI 75 at all times. Any calculations on how much?
Forum: Tech Log
1st Jun 2007, 12:04
Replies: 16
Views: 3,377
Posted By pstaney

Would that argument also pertain to other...

Would that argument also pertain to other variations in the wings profile? For example, would a properly designed wing have no need to have variable camber, twist, sweep, chord to wingspan ratio,...
Forum: Tech Log
27th Feb 2007, 13:08
Replies: 5
Views: 3,296
Posted By pstaney

So…how can an aileron do it’s job in just such a...

So…how can an aileron do it’s job in just such a situation you describe? With flow over the aileron separated long before CL max, as you say, and then if the pilot provides an input to deflect the...
Forum: Tech Log
26th Feb 2007, 13:17
Replies: 5
Views: 3,296
Posted By pstaney

My generalized wing was not meant to have any...

My generalized wing was not meant to have any specifically designed aerodynamics to prevent aileron snatch, nor enhance laminar flow. For example, a simple NASA 2412 airfoil. For airflow...
Forum: Tech Log
25th Feb 2007, 13:19
Replies: 5
Views: 3,296
Posted By pstaney

Aileron control in flow separation...and elevator

I’m trying to get an appreciation of the relationship between max Cl and the amount of flow separation one can expect. For example, consider a wing with a constant chord, camber, and no wash out. ...
Forum: Tech Log
30th Dec 2006, 18:31
Replies: 35
Views: 12,408
Posted By pstaney

OK, thanks for the replies. I'll have to read up...

OK, thanks for the replies. I'll have to read up some more. And yes, I should have known better than to question something Old Smokey says.
Forum: Tech Log
29th Dec 2006, 18:27
Replies: 35
Views: 12,408
Posted By pstaney

Smokey, I’m having a wee bit of a problem with an...

Smokey, I’m having a wee bit of a problem with an item from your last post.

From what I’ve read here at PPRUNE, the use of the area term is just a reference number, and has in the past been used,...
Forum: Tech Log
26th Dec 2006, 12:39
Replies: 35
Views: 12,408
Posted By pstaney

I'm not sure if I've seen the term LDD before,...

I'm not sure if I've seen the term LDD before, but the TAS for minimum total drag will increase with an increase in weight, and the value of minimum drag will increase also. So, the curve will move...
Forum: Tech Log
6th Dec 2006, 13:52
Replies: 10
Views: 42,912
Posted By pstaney

I'm not familiar with flight path vector...

I'm not familiar with flight path vector indication, but must work off the IRS? A quick ques on it's use as you describe....

Suppose on your 777 you have entered the SID required gradient, and...
Forum: Tech Log
4th Dec 2006, 18:22
Replies: 10
Views: 42,912
Posted By pstaney

For a close approximation, take the gradient in %...

For a close approximation, take the gradient in % and multiply by .57 For example, 2.7 X .57 = 1.54 degrees. Correct answer is 1.55 degrees, to 2 decimals.

Or for 10%, 10 X .57 = 5.70 degrees. ...
Forum: Tech Log
2nd Dec 2006, 22:02
Replies: 10
Views: 9,701
Posted By pstaney

MFS, truly a magnificient post. If I may ask 2...

MFS, truly a magnificient post. If I may ask 2 quick questions:
The falcon 50/900 series publish stall speeds in their AFM for clean configuration, yet it seems nearly impossible to happen since...
Forum: Tech Log
2nd Dec 2006, 21:42
Replies: 13
Views: 2,263
Posted By pstaney

But, as OLD SMOKEY has pointed out, Vy is not the...

But, as OLD SMOKEY has pointed out, Vy is not the best speed for minimum sector fuel. At least for his 777, he get further downrange on the same fuel by climbing at 320 kias vice 300 kias, at least...
Forum: Tech Log
1st Dec 2006, 13:46
Replies: 8
Views: 1,798
Posted By pstaney

Can you explain this? Charted vis will be a...

Can you explain this? Charted vis will be a minimum to land, without breaking regs?
Forum: Tech Log
30th Nov 2006, 12:56
Replies: 10
Views: 9,701
Posted By pstaney

All very interesting. I note you make a point of...

All very interesting. I note you make a point of saying stall “protection”. For aircraft with stall protection in the form of leading edge slats that automatically deploy (if not already), is this...
Forum: Tech Log
29th Nov 2006, 01:41
Replies: 10
Views: 9,701
Posted By pstaney

Not sure I understand why/how this affects Vso...

Not sure I understand why/how this affects Vso and Vsr. Suppose a manufacturer designs a stall protection system to advise the pilot of an impending stall at, say, 10% over actual stall speed. Does...
Forum: Tech Log
28th Nov 2006, 18:50
Replies: 10
Views: 9,701
Posted By pstaney

Bizjet, any chance you could give me the Vref...

Bizjet, any chance you could give me the Vref speeds for 3 weights (say 30,000 lbs, 35,000 and 40,000 lbs, or for some other suitable light, med, and heavy weights)? Then I'm interested in comparing...
Forum: Tech Log
28th Nov 2006, 11:36
Replies: 13
Views: 2,263
Posted By pstaney

Interesting...Not sure I've heard of "max range...

Interesting...Not sure I've heard of "max range climb speed". Concept makes sense. Is this greater or less than the max range speed/mach for the altitude climbing through? We seem to have best...
Forum: Tech Log
26th Nov 2006, 17:48
Replies: 6
Views: 2,708
Posted By pstaney

You're right, quite hard to find. Not much on C...

You're right, quite hard to find. Not much on C of P, but has AC info. Here it is, should work.
http://www.pprune.org/forums/showthread.php?t=130098&highlight=Aircraft+C+of+G+wing+pitching+moment
Forum: Tech Log
26th Nov 2006, 14:53
Replies: 90
Views: 26,124
Posted By pstaney

While being a North American and admittedly...

While being a North American and admittedly biased to Boeing, I observe that generally:
1. Those who have only flown boeings prefer the boeing
2. Those who have only flown airbus prefer the...
Forum: Tech Log
26th Nov 2006, 14:28
Replies: 6
Views: 2,708
Posted By pstaney

Other way around. Center of pressure will change...

Other way around. Center of pressure will change with mach and aoa. It is aerodynamic center that really doesn't change, theoretically calculated at exactly 25% MAC, but typically between 23 and...
Forum: Tech Log
13th Nov 2006, 15:42
Replies: 9
Views: 1,724
Posted By pstaney

Can ATC folks provide some insight on what...

Can ATC folks provide some insight on what they're allowed to request? Somehow, I just can't see their OPS Manual, or whatever, suggesting or recommending or allowing controllers to instruct pilots...
Forum: Tech Log
10th Nov 2006, 16:55
Replies: 10
Views: 5,213
Posted By pstaney

I think you would be guaranteed 48 feet per nm...

I think you would be guaranteed 48 feet per nm clearance.
Forum: Tech Log
9th Nov 2006, 18:46
Replies: 10
Views: 5,213
Posted By pstaney

Boh, I "think" it's the same in Europe. You'll...

Boh, I "think" it's the same in Europe. You'll notice that quite a few missed approach instructions in Europe give you a minimum climb gradient. What I don't know is whether this gradient (the few...
Forum: Tech Log
9th Nov 2006, 10:57
Replies: 10
Views: 5,213
Posted By pstaney

In the US, the missed approach gradient is...

In the US, the missed approach gradient is "terped" for 2.5%. This means all obstacles are below this 2.5% slope, which is a 1:40 slope. Exceptions are noted in missed approach climb gradient...
Forum: Tech Log
28th Oct 2006, 22:38
Replies: 15
Views: 3,475
Posted By pstaney

I believe you're diagram, I just don't understand...

I believe you're diagram, I just don't understand why.
A high AR wing has smaller induced drag generally, so how does this equate to bigger radius? With a glider with extremely long wings, for...
Forum: Tech Log
28th Oct 2006, 22:22
Replies: 8
Views: 3,450
Posted By pstaney

Could it be US and European cost indicies use...

Could it be US and European cost indicies use different units? Or do Boeings and Airbuses both use kg/min? Anyone know for sure?
Forum: Tech Log
24th Oct 2006, 16:55
Replies: 15
Views: 3,475
Posted By pstaney

Mr XPMorten. It is still the wingspan thing I...

Mr XPMorten. It is still the wingspan thing I don't understand. Small vortices start to diminish at 50 plus feet AGL for a glider, while stronger vortices don't start to diminish to 20 feet or...
Forum: Tech Log
24th Oct 2006, 11:54
Replies: 15
Views: 3,475
Posted By pstaney

Don't understand this wingspan thing. Glider...

Don't understand this wingspan thing. Glider with huge wingspan gives small induced drag and little vortices. These little vortices start to diminish at 50 plus feet above ground?
An F104 with...
Forum: Tech Log
15th Oct 2006, 16:10
Replies: 6
Views: 2,051
Posted By pstaney

I'd think that -2 G is all you'd get at 110...

I'd think that -2 G is all you'd get at 110 knots, as long as above the minimum flight weight (just had a thread on that). With positive camber of the wing, this means the wing is capable of more...
Forum: Tech Log
15th Oct 2006, 16:00
Replies: 36
Views: 6,143
Posted By pstaney

No doubt a disticnt possibility, and for sure...

No doubt a disticnt possibility, and for sure been done already. The horizontal stab can't even be reached in many cases to confirm it's condition. The reasoning has been the wings appear clear, so...
Forum: Tech Log
13th Oct 2006, 11:38
Replies: 36
Views: 6,143
Posted By pstaney

Not polished ice but...

I've seen in FAR 91 type flying the practice of accepting loose snow on the wing, believe it will always blow off on take off. May be true in cases of dry snow, I'm not so sure that when it gets a...
Forum: Tech Log
12th Oct 2006, 15:57
Replies: 5
Views: 1,938
Posted By pstaney

Perhaps the 320 has enough directional control...

Perhaps the 320 has enough directional control that Vmcl is below landing speed?

Stan
Forum: Tech Log
3rd Oct 2006, 10:39
Replies: 46
Views: 11,632
Posted By pstaney

Hello non iron. I don't understand your...

Hello non iron. I don't understand your question. zero fuel weight cannot be zero. it is the weight of the aircraft with zero fuel in the tanks. if this can be a minimum by regulations is one of...
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