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The link you sent is very good. An interesting mixture of engineering and pragmatical reasons why it won't work. To them I add the problem of transition - assuming that London could be served by two circular runways instead of five "normal" airports, how would it manage while (for example) Heathrow was razed and rebuilt as a circular runway?
Of course, if they razed Luton...
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
Nah! Saw the joke but, I have had the effort of explaining why things like circular airports are not good. Too long spent, I found the Mentor Pilot thing too late last time, so I was all primed for someone to come up with Circular Runways again. Luton, mmmm, not too bad an idea...
You can get DraftSight download for free. It appears they are now trying to upsell you, but when I used it, it was a pretty straight-forward copy of the old AutoCad 2d program. They will require an email address, and will send you 'offers', but for free, it was good for basic use.
You can also use SketchUp. It was a full 3-d package. I believe there is a personal edition for free, that doesn't have the professional features. I never got very used to the way it worked, after having used SolidWorks, but I remember finally figuring out that it could do what I wanted.
Hope these help. There are also probably a ton more freebies out there, but others would have to chime in for reviews on them.
I've spent the last couple of weeks on FreeCad, available for linux, windows and mac. Don't be scared by the version number (0.17), there's already a few years work in it. -- not by me.
linux version: very stable running on my machine (modern CPU but no graphics card - only the intel chipset graphics) and it's very fast, very responsive ... flicking between drawings, even smoothly does the continuous auto spinning of finished drawings
however I can also report on an older low powered win 7 box it kept throwing up... I think it was that PC though, cobbled up with from memory a not quite right video driver.
there's quite a few utube vids, a forum and even step-by-step tutorials so it's well supported.
previously I never used any CAD software and already 2 weeks in (only doing it in spare time) I can get by.
Apparently (from comments) if you know AutoCAD it's really easy to use and has very has alike capabilities.
Me: been playing around designing a new PC case, that involved drawing a mobo with precisely located mounting holes, plug locations, CPU cooler, back-plate...) as well as separate PSU, SSD's, fans and even the hex standoffs
- now putting it all together (will build the case around the bits - next lesson)
- not sure on how to draw cabling between items, that'll be my next next lesson.
I have used Sketchup free version for a while. It is excellent for 2d and 3d house design and I have used it for that. When I started getting involved with cnc I found many limitations in the free version such as exporting and importing files in different formats which could only be done with the paid version. I looked at Freecad but for me the learning curve was very steep. I was told about Autocad Fusion 360 Cloud Powered 3D CAD/CAM Software for Product Design | Fusion 360[^] and found the licencing for non-commercial use very generous. I am now working with Fusion 360 for furniture design and have found the support and tutorials excellent (particularly Lars Christensen). Google[^]
Fusion 360 can certainly be used for house design and that would be my recommendation.
"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts." - Bertrand Russell