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Search: Posts Made By: ChristiaanJ
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Forum: Tech Log
27th Oct 2008, 23:24
Replies: 82
Views: 10,979
Posted By ChristiaanJ

It seems we've now dealt with the original...

It seems we've now dealt with the original question, and we've all agreed lift and AoA decrease in a steady climb, even if only very little for small climb angles in a 'conventional' aircraft.

So...
Forum: Tech Log
26th Oct 2008, 11:31
Replies: 82
Views: 10,979
Posted By ChristiaanJ

ft, Re the quiz: My guess would be either...

ft,
Re the quiz:
My guess would be either thermals, or a standing wave flying parallel to a mountain ridge.

A cunimb might also do the trick, but I doubt you would do perf test flying near a...
Forum: Tech Log
25th Oct 2008, 21:40
Replies: 82
Views: 10,979
Posted By ChristiaanJ

Rainboe, Don't over-simplify... the increase in...

Rainboe,
Don't over-simplify... the increase in alpha is not the same as the cosine(climbangle). But your basic intuition of decreasing alpha with climb angle is right (except possibly for something...
Forum: Tech Log
25th Oct 2008, 16:32
Replies: 82
Views: 10,979
Posted By ChristiaanJ

Rainboe, Been there, done that. Initially I...

Rainboe,
Been there, done that.
Initially I expected a something squared to jump out of the woodwork and bite...
I've now come over to the dark side :)

But....
JABBARA,
Can you give us a...
Forum: Tech Log
22nd Oct 2008, 20:28
Replies: 82
Views: 10,979
Posted By ChristiaanJ

LOL.... But I don't mind admitting I got it...

LOL.... But I don't mind admitting I got it wrong.... Nothing beats pen and paper and thinking about it, rather than "off-the-cuff".
Right. My mistaek was not looking up cos(ca) for something like...
Forum: Tech Log
22nd Oct 2008, 17:32
Replies: 82
Views: 10,979
Posted By ChristiaanJ

OK, hands up to whoever said the real issue is...

OK, hands up to whoever said the real issue is the lift vector being turned back over (climbangle) degrees.

Everything else is secondary, except that the thrust angle is turned up over the same...
Forum: Tech Log
20th Oct 2008, 22:28
Replies: 82
Views: 10,979
Posted By ChristiaanJ

John, PLEASE? This is a fun topic, even if we...

John, PLEASE? This is a fun topic, even if we don't all agree...
Keep American politics out of it.....
We would like to keep this in "Tech Log", but this way it'll be relegated to "Jet Blast" in...
Forum: Tech Log
20th Oct 2008, 22:03
Replies: 82
Views: 10,979
Posted By ChristiaanJ

john, Welcome to this thread! I think...

john,
Welcome to this thread!

I think you'll find two kinds of bears of little brain here....
The young withersnappers (sp?) that know it all, and the ancients (of which I am one) that still...
Forum: Tech Log
20th Oct 2008, 21:04
Replies: 82
Views: 10,979
Posted By ChristiaanJ

Rainboe, Don't tell me.... I should print out...

Rainboe,
Don't tell me....
I should print out this thread, sit down with pen and paper and a calculator, and try to get my ideas sorted out, rather than answering all these posts off-the-cuff.
...
Forum: Tech Log
19th Oct 2008, 21:37
Replies: 82
Views: 10,979
Posted By ChristiaanJ

ft, Each time, we're talking about what are...

ft,
Each time, we're talking about what are essentially four vectors in the vertical plane: W, L, T and D.
So let's not fully neglect the fact that they are not necessarily at right angles all the...
Forum: Tech Log
19th Oct 2008, 17:00
Replies: 82
Views: 10,979
Posted By ChristiaanJ

krujje, "...how do you change your AoA without...

krujje,
"...how do you change your AoA without adjusting your climb angle?"

You're confusing climb angle and pitch attitude!
The climb angle is 90°.
For a "steady-state" vertical climb, lift...
Forum: Tech Log
18th Oct 2008, 16:58
Replies: 82
Views: 10,979
Posted By ChristiaanJ

Rainboe, Is your "g meter" just a thought...

Rainboe,
Is your "g meter" just a thought experiment, or does it exists, and if so, is it used in aircraft?

I can't quote recent aircraft, but in the big white pointy one, the 'g' indicator ran...
Forum: Tech Log
17th Oct 2008, 20:58
Replies: 82
Views: 10,979
Posted By ChristiaanJ

Yeah, and I'm supposed to be an aeronautical...

Yeah, and I'm supposed to be an aeronautical engineer and I still had some problems to get my mind around that....
So don't worry, you're not the only one!

Nope....
The "lift", in the sense of...
Forum: Tech Log
17th Oct 2008, 20:19
Replies: 82
Views: 10,979
Posted By ChristiaanJ

Hi all, As an ancient, I'm enjoying this, so...

Hi all,
As an ancient, I'm enjoying this, so I'll have to do some scribbling and calculating and posting this weekend to compose a proper answer!

Rainboe, welcome!
"total lift balances total...
Forum: Tech Log
16th Oct 2008, 20:05
Replies: 82
Views: 10,979
Posted By ChristiaanJ

I see I'll have to do the rest of the diagrams...

I see I'll have to do the rest of the diagrams and maths before I can convince anybody...

T*sin(climb angle) - D*sin(climb angle) pretty well cancel out, and are an order of magnitude smaller than...
Forum: Tech Log
16th Oct 2008, 16:46
Replies: 82
Views: 10,979
Posted By ChristiaanJ

Let me have a go... Let me define lift and...

Let me have a go...

Let me define lift and drag as follows:
Lift is the force acting on the aircraft at right angles to the air speed vector.
Drag is the force acting on the aircraft at right...
Showing results 1 to 16 of 16


 
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