NEW DOME DESIGN

[Charles Lasater]

Hi Everyone,

I just invented a new rotegrity dome that might interest you.

It is made entirely of 32" 2x6 pieces. Three pieces are attached with small plywood gussets to form identical struts which are uniquely combined to form a structural dome. Low cost and easy to assemble. Recycled lumber scraps repurposed into habitable shelter.

Here is a sketch designed with five point loads. Scalable by piece dimensions, a one trick pony.

Best, Charles

[Ashok Mathur]

Dear Charles,

Its a clever design with just 32 pieces for a large green house.

If you want other people to experiment with it, you need to provide the ecentricity ratios.

Regards

Ashok

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[Charles Lasater]

82 degree intersecting ends throughout. Diameter is 6.75 times the piece length. Join three pieces with 5x16 plywood gussets to make struts with 82x30 compound angle at one end and 82x18 at the other end, each facing up. All identical. Assemble all the three strut triangles first and attach five triads to each other to form the top. A central post helps to lift as you build upward. Five of the triads are truncated two thirds at bottom.

Simple assembly. Thank you for your interest, Ashok.

Affordable if recycling and repurposing.

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[Charles Lasater]

Note: Gussets on opposite side of strut intersection.

[Levente Likhanecz]

hi charles, if i remove from a 4V kruschke/lesser circle the appropriate struts, i can have everything "flat" in plane.

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[Levente Likhanecz]

[Eric Marceau]

Hello Levente,

To help visualize, what diameter is that intended to represent?

Also, are the two angled planes to become walls, or are they only for demonstrating planar alignment of the pentagon edges?

Eric

On 2026-05-04 12:07, Levente Likhanecz wrote:

(... deleted animated image ...)

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[Levente Likhanecz]

red planes/circles are great circles, its the design sphere diameter
green planes/circles are the lesser circles (all the same), so technically these 2 circle are all around (due to icosahedral symmetry)

i put some tutorial, how to design this in sketchup
https://groups.google.com/d/msgid/geodesichelp/0001cc9f-c6ee-4deb-aedc-c1a04c9b8496n%40googlegroups.com?utm_medium=email&utm_source=footer

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[Adam Ross]

Looks good, but I’m afraid it will practically fail at the pentagons and parallelograms, in my experience. They will compress unless a solid panel is used to keep the desired shape.

Kind regards,

Adam Ross

07974 929506
adamjr...@gmail.com

<UNISTRUT DOME.jpg>

Best, Charles

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[Levente Likhanecz]

i think, the opening post from Charles explain the proposed advantage of that build, i only put as a side note, what strut lengths i would use to have a flat seating version of this.

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[Charles Lasater]

Thank you, Adam. My intention was to design a one piece construction for simple assembly. Adding a triangle to the acute ends (60) of the parallelograms would certainly augment stability.

A fun project making hobby greenhouses.

Thanks also to Levente's novel approach.

Charles 

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