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by vrytar
Fri Sep 05, 2014 9:09 pm
Forum: Help on using FreeCAD
Topic: Help on designing Fuselage
Replies: 11
Views: 3774

Re: Help on designing Fuselage

Not sure how well this works for modern planes, but historic aircraft was essentially made by lofting from a few sections. You can see the shapes and positions of the sections in any decent plan. http://www.fiatcr32.rotorswings.com.au/ I try to create the sections shown in the plan as closely as pos...
by vrytar
Fri Aug 29, 2014 12:29 pm
Forum: Help on using FreeCAD
Topic: Help on designing Fuselage
Replies: 11
Views: 3774

Re: Help on designing Fuselage

I generally begin with cross sections in the same positions that they were on the real aircraft.
by vrytar
Fri Aug 08, 2014 10:52 am
Forum: Open discussion
Topic: FreeCAD on the web
Replies: 573
Views: 121969

Re: FreeCAD on the web

I thought about saying that previous CAD experience wouldn't hurt, but from the forum we've seen that previous CAD experience can be either a blessing, curse, or somewhere in between for somebody starting on with FreeCAD - it just depends on the individual. Well, I would definitely avoid saying som...
by vrytar
Thu Jul 24, 2014 10:02 pm
Forum: Help on using FreeCAD
Topic: Design irregular shapes in FreeCAD
Replies: 4
Views: 1849

Re: Design irregular shapes in FreeCAD

Create cross sections and use Part - Loft.
by vrytar
Sun Jul 20, 2014 7:44 pm
Forum: Open discussion
Topic: Any nearer to FreeCAD 0.14 going GA.
Replies: 254
Views: 40632

Re: Any nearer to FreeCAD 0.14 going GA.

I updated Wikipedia in all languages except Persian and Japanese, but I didn't go so far as to change screenshots.
by vrytar
Sun Jul 13, 2014 8:31 pm
Forum: Open discussion
Topic: Any nearer to FreeCAD 0.14 going GA.
Replies: 254
Views: 40632

Re: Any nearer to FreeCAD 0.14 going GA.

I checked the German release notes, and the first sentence (apart from being in English) still states July 6. Could you please also fix this to get things consistent?
by vrytar
Sun Jul 13, 2014 8:35 am
Forum: Open discussion
Topic: Any nearer to FreeCAD 0.14 going GA.
Replies: 254
Views: 40632

Re: Any nearer to FreeCAD 0.14 going GA.

I think July 1 makes much more sense. It was the date announced by wmayer beforehand, and he kept his promise and released a functional stable version on that date. There were people (including me) who installed and started using stable 0.14 on the very first day. It is of minor importance that some...
by vrytar
Fri Jun 27, 2014 6:20 pm
Forum: Help on using FreeCAD
Topic: complex curves
Replies: 2
Views: 701

Re: complex curves

I am not sure whether this is possible, but I found a rather convoluted way to do something of that sort. First I created four short parallel lines and moved them around space using the positioning window. Then I created a loft through them, which is the curved narrow strip. Then I extracted a curve...
by vrytar
Fri Jun 27, 2014 7:32 am
Forum: Help on using FreeCAD
Topic: More a Maths question than a FreeCAD one.
Replies: 9
Views: 2208

Re: More a Maths question than a FreeCAD one.

There is an amazing theorem called Archimedes' Hat-Box Theorem, which you might find instructive for this sort of problems. It says that the area of a spherical segment equals the area of its projection on a surrounding cylinder. See the picture at http://mathworld.wolfram.com/ArchimedesHat-BoxTheor...
by vrytar
Fri Jun 27, 2014 7:05 am
Forum: Help on using FreeCAD
Topic: More a Maths question than a FreeCAD one.
Replies: 9
Views: 2208

Re: More a Maths question than a FreeCAD one.

The revolution doesn't change the result because the surface is proportional to the revolution angle, so the final answer is angle = p * pi / 2, with p in [0, 1]. This is wrong. The result is skewed by the position of each infinitesimal line segment. Take a look at the picture of a spherical cap at...

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