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Search: Posts Made By: italia458
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Forum: Tech Log
3rd Apr 2013, 04:23
Replies: 388
Views: 99,887
Posted By italia458

versus [/URL] ...

versus

[/URL]

[URL]http://youtu.be/BY1k1GcZRww (http://youtu.be/BY1k1GcZRww)

...sorry, I couldn't resist! :)
Forum: Tech Log
21st Oct 2012, 20:52
Replies: 388
Views: 99,887
Posted By italia458

Lyman... Lift is complex! And...

Lyman...



Lift is complex! And Bernoulli wasn't a hydrologist, he was a physicist and mathematician. Daniel Bernoulli (http://en.wikipedia.org/wiki/Daniel_Bernoulli) versus a hydrologist...
Forum: Tech Log
20th Oct 2012, 00:52
Replies: 388
Views: 99,887
Posted By italia458

Lyman... What you're saying makes sense.....

Lyman...

What you're saying makes sense.. but not to create lift - it makes sense to accelerate the airflow and deflect it downwards. It's the downwards velocity that creates an upward force on...
Forum: Tech Log
19th Oct 2012, 21:14
Replies: 388
Views: 99,887
Posted By italia458

I wouldn't call myself a scientist but I have...

I wouldn't call myself a scientist but I have essentially the same 'beliefs' as they do. I'm not on any one side, I'm all about exploring what the real answer is, regardless of what it is.
...
Forum: Tech Log
19th Oct 2012, 20:53
Replies: 388
Views: 99,887
Posted By italia458

Lyman... Are you familiar with F=ma? If you...

Lyman...

Are you familiar with F=ma? If you are, you'll know that for a mass (ie: a book, car, computer, apple or air) to be accelerated, there must be a net force. A net force means an 'excess'...
Forum: Tech Log
19th Oct 2012, 20:06
Replies: 388
Views: 99,887
Posted By italia458

True. But saying Bernoulli is responsible for...

True. But saying Bernoulli is responsible for this is exactly what this paper was highlighting as a 'myth'.



Not true. Lift is directly related to the downwash of air. The article also...
Forum: Tech Log
19th Oct 2012, 19:39
Replies: 388
Views: 99,887
Posted By italia458

Definition of Streamlines...

Definition of Streamlines (http://www.grc.nasa.gov/WWW/k-12/airplane/stream.html)
Forum: Tech Log
19th Oct 2012, 18:12
Replies: 388
Views: 99,887
Posted By italia458

Peter... I just read the whole article word...

Peter...

I just read the whole article word for word and I agree with his description of lift. It has added a new perspective to my understanding of lift and to me it makes sense.

I'm not sure...
Forum: Tech Log
16th Oct 2012, 17:22
Replies: 388
Views: 99,887
Posted By italia458

Lyman... I have no idea what you're trying...

Lyman...

I have no idea what you're trying to say... I don't think you understand the definitions that I've already mentioned: geometric angle of attack and absolute angle of attack. It's...
Forum: Tech Log
16th Oct 2012, 02:59
Replies: 388
Views: 99,887
Posted By italia458

FlightPath... That's a false premise. ...

FlightPath...



That's a false premise.

In earlier posts I stated a few definitions of AoA... I'm not sure you have the same understanding of those definitions as I do.
Forum: Tech Log
16th Oct 2012, 02:56
Replies: 388
Views: 99,887
Posted By italia458

This looks like a whole bunch of non-sense going...

This looks like a whole bunch of non-sense going on here!

Lyman...



:ugh: Of course I realize that's you quoting me...

Re-read my post where I defined the AoA terms that I was using and...
Forum: Tech Log
15th Oct 2012, 21:48
Replies: 388
Views: 99,887
Posted By italia458

Peter... I briefly read through that paper...

Peter...

I briefly read through that paper and here are my thoughts on it. That paper seems to be written to just talk about false theories of lift. I can't speak for what the author's thoughts...
Forum: Tech Log
15th Oct 2012, 21:21
Replies: 388
Views: 99,887
Posted By italia458

Lyman.. Zero lift AoA is a geometric...

Lyman..



Zero lift AoA is a geometric AoA measurement, meaning it's the angle between the chord line and the relative wind. Zero lift means that the airfoil is producing no net lift force in...
Forum: Tech Log
14th Oct 2012, 04:43
Replies: 388
Views: 99,887
Posted By italia458

I have to agree with A Squared. Lyman, you're...

I have to agree with A Squared. Lyman, you're talking about a phenomenon that is separate and more involved than what was being discussed. The simple, and correct, answer to what was being discussed...
Forum: Tech Log
13th Oct 2012, 16:54
Replies: 388
Views: 99,887
Posted By italia458

Thanks, Peter! That was a nice clarification. ...

Thanks, Peter! That was a nice clarification.

In Figure 5 (http://www1.nasa.gov/centers/dryden/pdf/88507main_H-2179.pdf) there are 3 large diameter tubes running along the mid-portion of the...
Forum: Tech Log
26th Jul 2012, 09:51
Replies: 388
Views: 99,887
Posted By italia458

Just came across this. It's a bit elementary but...

Just came across this. It's a bit elementary but quite good I think for getting an idea of what's going on.

Rolls-Royce: Journey Through A Jet Engine...
Forum: Tech Log
26th Jul 2012, 09:39
Replies: 388
Views: 99,887
Posted By italia458

John... I understand what you said about...

John...

I understand what you said about managing intake air so that the engine only receives subsonic air by controlling the shockwaves but why can't the engine accept supersonic air? Is it...
Forum: Tech Log
26th Jul 2012, 09:29
Replies: 388
Views: 99,887
Posted By italia458

Owain... I agree with Easy Street. I...

Owain...



I agree with Easy Street. I misread and assumed you were talking about compressor blades. The turbines are extracting energy from the airflow - similar to the air rotating the...
Forum: Tech Log
26th Jul 2012, 07:48
Replies: 388
Views: 99,887
Posted By italia458

Owain... I wasn't talking about a...

Owain...



I wasn't talking about a turbojet, I was asking about the intake system that creates 63% of the thrust at cruise speed.

Regarding the multi-stage propeller bit: I understand that...
Forum: Tech Log
26th Jul 2012, 06:18
Replies: 388
Views: 99,887
Posted By italia458

Owain... Excellent article! There is a lot...

Owain...

Excellent article! There is a lot more to lift than Bernoulli.

Back to thrust produced by the intake...

Is there a good article that explains how this all works?

My...
Forum: Tech Log
26th Jul 2012, 04:47
Replies: 388
Views: 99,887
Posted By italia458

John... I should have been more clear. I was...

John...

I should have been more clear. I was talking about ram effect on a basic turbojet (subsonic) engine which would provide a slight rise in compression at the entrance to the engine which...
Forum: Tech Log
26th Jul 2012, 02:26
Replies: 388
Views: 99,887
Posted By italia458

Regarding the J58: A ramjet is not the...

Regarding the J58:



A ramjet is not the same as "ram effect" on a turbojet engine. You will not get even near half the thrust from ram effect on a turbojet.
Forum: Tech Log
26th Jul 2012, 01:10
Replies: 388
Views: 99,887
Posted By italia458

Lyman... A jet engine's blades aren't there...

Lyman...

A jet engine's blades aren't there to propel the airplane forward (assuming we're talking strictly about a turbojet). They're called compressor blades because they compress the air then...
Forum: Tech Log
26th Jul 2012, 00:23
Replies: 388
Views: 99,887
Posted By italia458

Lift is very complicated. Nobody currently knows...

Lift is very complicated. Nobody currently knows why a wing can create lift. It's similar to the fact that nobody currently knows why there is inertia. We have detailed theories and laws where we can...
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