Geodesic Slope angles

[mswhin63 (Malcolm)]

Hi , I am wondering how do you determin the slop angles for foam domes when joining toegther.

It is just trail an error or is there some sort of calculation. I have not been able to see any infomration as yet.

[Auster1b (Neil)]

Malcolm,
Try this online calculator, just choose the layout.

Neil

[Auster1b (Neil)]

the link is

http://simplydifferently.org/Geodesic_Dome_Notes?page=3

Neil

[ChrisM]

Hi Malcolm,

I built a 3.6 metre diameter 3V geodesic dome using this link for the dimensions: http://www.desertdomes.com/domecalc.html

I can't recall where I found the joining angle, but I used a nominal 11 degrees. I reckon that trial and error would be the easiest way to get the foam cut angle correct. A smaller diameter dome would need a larger angle between the joining faces, and vice versa.

Chris

[mswhin63 (Malcolm)]

Thank All, looking at all the infomration 11 degrees is the right angle. It is a good starting point at least. Thanks Neil for your link, this is the only one I dont have

I dont have a lot of time to commit so this will run the slow mo project.

Cheers

[el_draco (Rom)]

If you haven't started yet, you might try this:

http://www.geo-dome.co.uk/article.asp?uname=trap_dome

Angles are easy and you can make it 5/8 quite easily. Dome slit is a lot less complicated as well.

Rom

[mswhin63 (Malcolm)]

Thanks Rom,

I will keep that in mind, I start Uni next week and the buil is too detailed, so i have to go for an easier design in the interim now.

Spending more time on Uni prep now than anything else.

Thanks for the info.