I am looking at building a Geodesic dome..
Wikipedia describes this as
I have been through many video's
First and formost, you need a design,
So either, it appears that you need to become a fundi on Software like sketchup...
Or here is a video, that shows how to create a dome...
From the above video
Geodesic domes are cunstructed from 2 types of Triangles
Equilateral (3 Equal Sides) 10 Per Dome
Isosceles (2 Equal Sides) (5 per Pentagon)(6 Pentagons = 30 Triangles)
R=50cm
A is 15.45 cm
B is 13.66 cm
r= radius of the dome
A= r x 0.61803
B= r x 0.54653
Dome Frequency
Geodesic Frequency 2V, 3V, 4V A dome’s frequency is the term used to refer to the amount of triangles in your structure. An icosahedron is the shape of the geodesic domes we are building. The most basic frequencies are 2V, 3V, and 4V.
A small dome only requires a 2V. This means there are only two different sizes of triangles in your layout. If you attempted to build a 40-foot diameter dome however, using the 2V frequency your triangles would be so large that you would have to use much stronger wood to handle the span of your triangles. Plus covering these huge triangles would be next to impossible. Therefore, I would suggest not using a 2V for anything larger than an 18-foot dome.
A 3V would work great, but the only problem with a 3V is the base of your dome wouldn’t be flat. I don’t suggest a 3V frequency for this reason. I would suggest using a 4V for anything larger than an 18 foot dome. I used a 4V for my first 40-foot dome. The
4V has 6 different sized struts, and the base of your dome is flat. With that said, let’s start step by step and build a dome.
Links
Then by chance, I found this link which explains very nicely about a 2v 3v and 4v design, as well as links to a calculator
Another very nice document can be found here
Covering the greenhouse, it would appear that PolyKeder or SolaWrap is the best product
Mini Project domes
Dome Calculators
Frequency Explanation and another
More updates to follow
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