posted 02-09- 01:56 PM               

Is the Airpoint a real point or is it a vektor ? Does it matter if the AirPt hits the wing in a 90 deg angle (like the spit).

I ask this cause all shiped planes got rotated wings/airpt and when I import my wing lod (rotated before in 3ds) I got the same as the bf190 wing (but my plane wont flight ;\). I moved all AirPts and inertia boxes in the right place but the plane spins like crazy (the AI always jumped out )

Airpoint of the spitfire wing

Airpoint of the Bf109 wing

posted 02-09- 02:58 PM            

Here's something I learned:

After you are finished with your work (texturing, building...etc.) save it as a regular file (what ever 3ds uses.. .3ds i presume).

Then reopen your work and if your software has the procedure, import a copy of the piece you are working on (in this case, the inner wing). This MUST be a 'clean' piece. What I mean by this is a piece that has freshly been exported from OPS and hasnt been moved or rotated.(the lod file)

Now DONT touch the clean part you just imported. It is imperative (spelling ) that you do NOT move the imported piece. It is in the correct spot to go exactly back into OPS. Move/rotate your final part (the one you are working on) and put it exactly on top of (all planes x,y,z) the clean imported part. Then delete the imported part and export to OPS. It will be in the righ spot (maybe off by a little, but is way better than 20 feet).

The final thing is make sure you are importing to an unmolested part in OPS(one that you havent moved or rotated).

[This message has been edited by DanW (edited 02-09-2000).]

posted 02-09- 04:14 PM               

Tail - I thought something like that. So the biggest problem for me is this: in 3ds I build up the wing with 3 objects the wingtip, the middle wing and the inner wing.
As you know the automatic positioning didn´t work for me so I attached the inner wing object to the fuse object (so that this part is positioned correctly to the fuse after import to OPS). Now I got a correct positioned and rotated inner wing (part of the fuse) in OPS - but its is nearly impossible to line up the real wing parts because of the rotation.

posted 02-09- 04:55 PM               

That must be an old build of the 109 ... that got fixed two PP's ago!

posted 02-09- 05:04 PM               

I didn't mean to criticise the 109 just trying to explain the difference for Laika.

posted 02-09- 05:28 PM               

Basically the theory is this, the implied vector from the airPT (as shown in OPS) shows where, and what direction the aerodynamic forces are applied to the airfoil.

In a real wing this is normally 1/4 chord back from the leading edge and perpendicular to the true centreline of the wing front profile.

I wish I had a picture but imagine a line that is drawn from the point of the tip of the wing to exactly half way between the upper and lower surfaces at the thick end, this is the line the airPT vector should be perpendicular to.

Becuase the airPT vector in derived from the Z-axis of the LODm the only way to set the orientation of the airPT vector is to rotate the wing, the wing thats imported into OPS must have the line I described above aligned with the X-axis, when not rotated at all. Then you can rotate it to look good visually and the Dehidral will happen automatically.

posted 02-09- 07:16 PM               

No problem ...

I'm just being an insufferable ass as usual!

LOL!

posted 02-10- 03:32 PM               

Thanks again !

posted 02-10- 03:40 PM               

One more question - the wing for the I-16 is straight on the upside (no rotation) and the lines of the bottom are rotated (thats what I see in "Front View"). In the tests I straighted out the imagined centreline of the wing, is this right ? Or should I straighten the bottom "line" of the wing ?

As I understand Bryan I´m right ?

posted 02-10- 03:45 PM               

I'll send you a fixed one as soon as I get a chance.

posted 02-13- 02:15 PM               

Linear Transformations from Rn to Rm
---------------------------------------

Rotations

If T:R^2 -> R^2 rotates each point in the plane bout the origin through an angle theta, then it follows that the standard matrix for T is

[ cos theta - sin theta ]
[ sin theta cos theta ]

Am I looking at the right section?

posted 02-13- 05:37 PM               

Perhaps I can do a quick hack without the fancy status bar stuff, but put away your linear algebra books, I'll even let you input angles in degrees! Unless that stuff turns you on of course.

posted 02-14- 09:51 AM               

For the love of all that's holy ...

PLEASE look at the "Canopy cutting" bug while you pfutz whith the rotation thingy!!!

I've got like four hair left on my head and I'd like to keep'm.

YOU'VE SPOILED ME!!!! ....