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I had an assembly. When I redrew extruded cut in the assembly, the dimension changed to blue instead of pink. I would like to know the difference between blue and pink dimension. By the way guys, I have done my course on CATIA not Solidworks. Thank you.

I would like to know the chemical formula of wood. Thank you.

I have a sheet metal with four holes equally spaced for one configuration and six holes for another configuration. Behind this sheet metal, there is another part with the same number of holes of a different diameter for which I used "convert entities" to have the holes at the same position as...

How do we make design tables so that the change in configuration in a part changes in the assembly. Thank you.

www.bn.com or www.askjeeves.com and type a complete phrase to find bookstores on the internet. Bye!

Do not forget to make the calculation as a thin airfoil.

That`s a good question because I don`t know how a single engine airplane could be balance in terms of rotating inertia!

Thank you very much, but I found it. The source of error may come from SFC with the thrust varying with the mach number: how do I take into account this? Thank you.

Could somebody explain me how to calculate the climb time from the maximum climb rate, because I can't correct my report. Thank you.

Relying on a book I read, the induced drag can not be suppressed because it generates lift. So winglets decrease cL and make airplanes fall!

Thank you, I was talking precisely about suspended bridges with truss under it to stiffen the structure in case of aerodynamic problems.

I would like to know how long can a span be if the trusses are under de bridge

You can find it in "Low speed aerodynamics" book on sale at www.bn.com

...the lift. The aspect ratio does not change, it`s the lift coefficient CL which changes. CDi=0 means that CL=0 not AR=infinite (CDi=CL2/(pi*AR)). The author Stepen Dalton received a medal from the Royal Photographic Society. "Induced drag exist where there is lift". "The...

You have to be careful with CFD software because I don`t know if they now can take into account boundary layer separation!

Wings with flaps out are two, three or four element airfoil. You can determine the lift by the panel methods. Bye!

I would like to know how much noise reduction we have for a highway which is higher than the houses and buildings. I know that sometimes we add a sound barrier on a segment of the highway where the buildings are higher than the road. Thank you.

In Froude theory, for a control volume, you have Q=pi*r^2(V2-V0) where V2 is the speed at radius r.

The ground effect is when a wing is near the ground. The stream lines of the downwash cannot bend alone without the wall: it is why we have to use an image. Ground effect is more easy to understand in case of a helicopter near the ground. For negatif lift, I believe you have to use an image too.

I type complexe characters in Word then past it in AutoCAD. For example Insert, Object, Microsoft Equation Editor 2.0 . Then in AutoCAD, you can even modify the size of an exponent. Or you can edit your text and choose other after clicking symbol.