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Search: Posts Made By: CliveL
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Forum: Tech Log
12th Jan 2011, 16:58
Replies: 52
Views: 40,163
Posted By CliveL

Nah! there are lots of diagrams and even a nice...

Nah! there are lots of diagrams and even a nice little Java applet that lets you change AoA and see what that does to pressure distributions, lift and pitching moment.

CliveL
Forum: Tech Log
12th Jan 2011, 16:31
Replies: 52
Views: 40,163
Posted By CliveL

Microburst, Can I suggest you 'Google' AA241...

Microburst,

Can I suggest you 'Google' AA241 which will put you into a Stanford University site that gives course notes for Aircraft Design.
You will find the answers to all your questions there...
Forum: Tech Log
11th Jan 2011, 21:12
Replies: 52
Views: 40,163
Posted By CliveL

I agree, tail loads to trim have nothing to do...

I agree, tail loads to trim have nothing to do with the original question as to the nature of aerodynamic centre of an airfoil but I was responding directly to a subsequent question posed, and if you...
Forum: Tech Log
11th Jan 2011, 21:09
Replies: 52
Views: 40,163
Posted By CliveL

I don't think you read the question and my...

I don't think you read the question and my answer:

Question: So we can use any reference point we like right?

Answer: Yes

Pray tell me how that is in any way in conflict with anything you...
Forum: Tech Log
11th Jan 2011, 16:51
Replies: 52
Views: 40,163
Posted By CliveL

No, it is very real Yes, but it is usual to...

No, it is very real

Yes, but it is usual to use 25% mean aerodynamic chord in the wind tunnel and aircraft CG for anything else



Tail lift = zero (at zero thrust)

Dunno - what is ANU...
Forum: Tech Log
11th Jan 2011, 09:46
Replies: 52
Views: 40,163
Posted By CliveL

Thanks Lightning Mate - that says it all. ...

Thanks Lightning Mate - that says it all.

CliveL
Forum: Tech Log
10th Jan 2011, 07:35
Replies: 52
Views: 40,163
Posted By CliveL

I think there may be some misunderstanding here....

I think there may be some misunderstanding here. Let me put it a simply as I canhttp://images.ibsrv.net/ibsrv/res/src:www.pprune.org/get/images/smilies/smile.gif

Aerodynamic (pitching) moment is...
Forum: Tech Log
8th Jan 2011, 12:19
Replies: 52
Views: 40,163
Posted By CliveL

Not true I'm afraid. The wind tunnel guys can...

Not true I'm afraid. The wind tunnel guys can choose any reference point they like. For convenience they usually use 25% mean aerodynamic chord, but that is not the aerodynamic centre for a complete...
Forum: Tech Log
8th Jan 2011, 11:15
Replies: 52
Views: 40,163
Posted By CliveL

I don't know what you mean by "in" the...

I don't know what you mean by "in" the aerodynamic centre. Cmo is by definition the pitching moment at ZERO lift and the concept of centre of pressure in conjunction with zero lift is meaningless. As...
Forum: Tech Log
8th Jan 2011, 05:46
Replies: 52
Views: 40,163
Posted By CliveL

Sorry guys, but that is not what I said. If you...

Sorry guys, but that is not what I said. If you take moments about the point where the lift due to incidence acts then you will get a constant pitching moment as incidence varies and this point is...
Forum: Tech Log
7th Jan 2011, 18:14
Replies: 52
Views: 40,163
Posted By CliveL

Yep, they are all wrong. The original question...

Yep, they are all wrong.
The original question was related to the aerodynamic centre of an airfoil. This is the point at which the lift due to angle of attack acts. Theoretically, for subsonic...
Showing results 1 to 11 of 11


 
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