Below are links to various dome tools for calculating strut lengths, floor area, panel sizes and other useful measurments for building geodesic, segmented and other types of dome.

Use this tool to find out the total snow load on any size geodesic dome.

More tools coming soon.

[ comments 114 ]

posted by
aeQea

22/02/2007 09:23:15

exactly what i was looking for. thanks for the site.

posted by
Colin

25/03/2007 21:45:08

Hi Paul,
Just a heads up, mate.
The strut end angles in the 3v design calculator need to transposed.
Red struts (B) in the 3v graphic are 80 deg (10 deg) and the blue (A) struts are 78.3 deg (11.7 deg)
The green strut (C) angles are ok.
It`s that colour coding difference again :)
Regards Colin

posted by
admin

27/05/2007 22:25:11

Thanks Colin,
I've fixed that now, colour coding and angles should now be the same throughout the site. Cheers, Paul

posted by
mehdi

05/07/2007 11:11:27

hey man,i just wanna express my gratitude, for the wonderful work you are doing , this site is real a gem

posted by
Herbert Chang

12/07/2007 23:57:35

So far this is the most practical site for dome fabrication I have found, it decided to give it a try and made me a 2v Dome for a dog house. I used the site's calculation tool to cut the struts at the determined lengths and angles but I could not build it using the color coded diagram. The problem seems to be the strut lengths are transposed.

posted by
colin

18/07/2007 03:04:34

Hi Herbert
you are right they`re transposed..i missed it too but i`m sure Paul will fix it :)
The red "A" struts in the diagram should be short struts (total 30) with 16 deg end angles and the blue "B" struts should be the longer ones (total 35) with 18 deg end angles.

posted by
Enoch

01/10/2007 16:20:29

Hi there
We are looking to build a bell shaped dome frequency 3, would it be posible to seek your council on how we can build this. How many copper bars we need and dimensions, if it is 2m radius by 4.5

posted by
colin

02/10/2007 10:52:46

Hi Enoch
A 3 frequency dome is fairly straightforward to make. Calculating the strut lengths for a bell shaped dome (4m diameter x 4.5m high?) would be a lot more difficult.
Sounds like a fun project though especially as it`s made of copper What is it destined to be used for?

posted by
trapper

27/10/2007 01:41:24

I am trying to figure out the plans for a 24' dome. This is my first attempt at it...any pointers are very welcomed...

posted by
Colin

28/10/2007 20:19:58

Hi trapper,
Planning everything down to the last detail before you start has to be top of the list.I usually make a checklist of the various fabrication steps and tick them off as i go, that way i know where i am and what needs doing next :)
It could just be i`m just getting old of course but i find it the easiest way. A 24ft dome is a fair sized first project, you didn`t mention if is it steel conduit, timber strut or panel type. As it`s your first dome I`ll guess its a 2 or 3 frequency design.

posted by
marcel

07/11/2007 13:29:44

looking to build a dome for a greenhouse whit plastic for covering
8 to 10 meter a cros

posted by
Colin

08/11/2007 04:31:09

Hi Marcel
A 4v low profile dome may be ideal for an 8m diameter but it would be quite a project.The 2v seems the most economical for 2.4m timber lengths but your plastic covering probably won`t last too long due to the triangle size (2.4m), it`ll flap itself to pieces in the wind.
A 3v 3/8 is better at 1.65m triangles but could still flap.
The 4v has ~1.3m triangles and you should get 2 struts from each 2.4m timber taking the hubs into account.. you`d need 190 struts though

posted by
Colin

08/11/2007 04:40:21

Hi Marcel
For a dome that size with a poly covering you`ll need to keep the triangles fairly small to prevent them flapping in the wind, which will destroy them in short order.
I think the minimum would be a 3v 3/8 but even that has pretty large triangles 1.65m across. A 4v would be better with 1.3m triangles but having 250 struts and 91 hubs it`ll be quite a project.

posted by
trapper

15/11/2007 22:22:30

decided to go with a 14' 2v dome...wooden struts.. wish me luck.

posted by
Colin

16/11/2007 14:27:42

Good Luck, though you shouldn`t need it :)
A 14ft 2v doesn`t have a lot of internal height near the sides and the door could be a problem too.
A 20ft may be better but then the cover flapping becomes a problem again :)

posted by
Colin

18/11/2007 05:13:09

Here`s one mainly for Paul,the site admin, but could be useful to Trapper and other 2v dome builders.
Borrowed your graphics again Paul, i hope you don`t mind :)
2v hub angles: click here
(Just replace the X`s with W`s..pesky spam filter lol)

No problem Colin, I made the link live for you. Nice diagram by the way :-)

posted by
trapper

20/11/2007 00:11:50

i am going to have a 4 foot knee wall under the 14 ' dome

posted by
Colin

20/11/2007 06:46:25

Cheers Paul, it may be safer to put the pic somewhere in the 2v section in case the file ever dissappears :)
Hi Trapper,
That`s a fair old height for a kneewall.I`ve always found kneewalls eat loads of timber, especially when you build square frames that bolt together which is a good plan for strength.
Kneewalls normally use a larger timber size than the dome frame itself which can add to the cost. Here`s another dilemma :) A 14ft 2V dome with 4x4 framed timber kneewall panels uses about 460ft of timber,44% of that is in the kneewall. By comparison, a 14ft 3V 5/8 dome without a kneewall also uses 460ft of timber.
I guess it may cost about the same once you factor in the extra hubs, bolts etc.

posted by
Nathan

21/11/2007 06:52:13

I am trying to build a 2V dome using pannels. Does anyone know the best way to figure out the 2 different dihedral angles?

posted by
Colin

18/12/2007 14:45:06

Hi Nathan
here you go...
These relate to the panel drawings on the 2v calculator page:
The dihedral angles for "Y" panels (10 equilateral triangles) are all 11 degrees with 60 degree vertex angles.
The dihedral angles for the "X" panels (30 pent triangles) are 11 degrees for the "A" sides and 7 degrees for the "B" side, vertex angles are 55.6 degrees for the "B" (long) side and 69 degrees for the vertex at the apex of the (short)"A" sides.

posted by
trapper

04/01/2008 22:36:18

how do you determine when building a 3v wooden strut dome, if its 3/8 or 5/8?? does that change the lengths of the struts?

posted by
Colin

05/01/2008 09:43:24

Hi Trapper
It doesn`t change the lengths, just the number of struts. If its a 3/8 (technically a 4/9) its less than half a sphere and if its a 5/8 (technically a 5/9) its more than half a sphere. Odd frequency spheres (3,5,7 etc) don`t split into two equal hemispheres but even frequencies do.

posted by
Coopster

13/03/2008 15:10:03

I am looking to build a pipe hub with 2"x4" woooden struts. Am I correct by assuming that I subtract the axial angle from 90 degrees to know the angle to set my radial arm saw?

posted by
Colin

14/03/2008 01:38:24

Hi Coopster
Thats correct. Most saws denote the 90 deg crosscut as "0" on the scale,just go +/-16/18 for a 2v dome or +/- 10/12 for 3v.
The strut end will be fractionally longer along the cut angle so you may need to make your tubular hubs a tad longer if you need them to fit flush with the timber.

posted by
Robin Brown

28/03/2008 21:55:44

I want to build a geodesic dome as a small performance venue at a community green festival. Probably a 2V or 3V with a 15 feet radius. I need to be able to produce the wind stress calculations to satisfy the safety co-ordinator.
Using steel electrical conduit (EMT) for the frame, and a cover in some kind of vinyl tarp, glued or sewn.

posted by
Colin

29/03/2008 03:09:41

Hi Robin
The surface area of your dome works out to approx 1300 sqft for the 2v or 1100 sqft for a 3v. I think the main issue is how well you can anchor it the ground. It may be better to use the 3v design which has more struts and shorter strut lengths (6ft vs 10ft for the 2v) will be stronger and create smaller triangles. Large triangles made of poly or canvas etc will form pockets (aka parachutes)when the wind hits them. A dome covered with pockets won`t deflect the wind too well :)

posted by
Darren

21/04/2008 04:10:51

Hi,
Looking to build a home using dome technology, on one level but didnt want the dome to be high e.g. half dome. Im looking to spread the dome so its lower, "x" at 15ft at the centre. I would run a vertical stone wall around and sit the done on top having some of the spread of the dome still touching the floor creating outside storage areas

posted by
Colin

22/04/2008 03:06:42

Hi Darren
A 38ft diameter 3v 3/8 (4/9) would fit the bill quite well, it`d be 16ft high. It uses standard 8ft lengths of timber to makes things a little easier. Punch 5900mm radius into the 3v dome calculator to get an idea of what you need.

posted by
Gerbil

22/04/2008 13:46:58

Amazing site, this has seriously helped me with my final year uni project!!! I'm designing a hopitality complex based at silverstone circuit and it has a large glazed dome housing a restaurant!

posted by
Brent

I've just spent the last 8 hours learning from your site and brainstorming. I'm a professional builder who loves making things. Thanks for all the good information!

posted by
neil

Do you plan to make a calculator for a 6v dome?

posted by
colin

Hi Neil
With 555 struts, 196 hubs a 6v is very labour intensive.It is normally used for very large domes to reduce the individual strut lengths. Having said that, my dome incorporates 6v geometry it isnt very big.
6v does make for a very smooth curve though :)

posted by
Colin

Hi Neil
Having some issues posting a reply but we`ll have another go :)
A 6v is very labour intensive and normally used for very large domes.
Are you planning to build something big?

posted by
Martin

Im wanting to build a 46ft geodesic dome, I was thinking of using 3/4 inch electrical conduit, Is they anywere I can get plans for one from? Ive been told it will need to be a 6v dome as it is so big. has anyone made one this size that could give me some help??? Many thanks.
Martin

posted by
Colin

Hello:
I found a land with two domes structures. They are not been finish. I haven't buy it yet, because I'm worry if the structures are not been well constructed and if I have to spend a lot of money on it. It has five years of constructed. I want to know if it has a solution or is better to do something else. Thanks. Mariela P.D. (I can send photos)

posted by
Keith

09/12/2008 03:55:53

Thank you so much for this site

posted by
Bridgette

16/12/2008 04:01:49

Same as Keith above. Just fantastic.

posted by
Nathan

30/12/2008 11:04:26

High Paul i'm new at this and i was wondering if i could seek your council on a project of a 2v dome with a radius of 15. Also wondering the weight this dome will bear and wich materials you suggest for a underground dome. Great site, most usefull one i have found would greatly appretiate your opinion lol id hate to put the effort through just to have it collapse.

posted by
Admin

31/12/2008 21:52:17

No Problem Nathan, I'll post a thread in the forum to discuss this firther...Click here

posted by
Joe Bleakley

13/01/2009 02:40:29

Hi Paul,
Great site, almost what I was looking for.
Do you know where I could find the calculation tool for a 9 frequency dome/sphere.
I'm attempting to make a 3.6m diameter sphere sculpture based on a 9 frequency geodesic sphere.
Thanks
Joe

posted by
Gavin

13/01/2009 11:54:34

Thanks for the wonderfull site . I wonder if anyone can help If I enter the radius in the calculator and get my strut lenghts do I need to add on to this if I intend drilling bolt holes or is it included and if so how far down does one drill the holes?
Thanks
Gavin

posted by
Simon

15/01/2009 21:26:18

I uploaded this image of the strut labels:

total struts: 2430
strut parts: 18

part number: 15
number off: 60
length: 0.190
bevela: 88
bevelb: 88
mitrea: 87
mitreb: 87

part number: 0
number off: 120
length: 0.205
bevela: 88
bevelb: 88
mitrea: 87
mitreb: 87

part number: 16
number off: 60
length: 0.211
bevela: 88
bevelb: 88
mitrea: 87
mitreb: 87

part number: 2
number off: 120
length: 0.220
bevela: 88
bevelb: 88
mitrea: 86
mitreb: 86

part number: 1
number off: 60
length: 0.223
bevela: 88
bevelb: 89
mitrea: 86
mitreb: 86

part number: 4
number off: 120
length: 0.227
bevela: 88
bevelb: 88
mitrea: 86
mitreb: 86

part number: 17
number off: 60
length: 0.229
bevela: 88
bevelb: 88
mitrea: 86
mitreb: 86

part number: 5
number off: 120
length: 0.233
bevela: 88
bevelb: 88
mitrea: 86
mitreb: 86

part number: 3
number off: 120
length: 0.234
bevela: 88
bevelb: 89
mitrea: 86
mitreb: 86

part number: 8
number off: 240
length: 0.241
bevela: 88
bevelb: 88
mitrea: 86
mitreb: 86

part number: 6
number off: 180
length: 0.242
bevela: 88
bevelb: 88
mitrea: 86
mitreb: 86

part number: 7
number off: 240
length: 0.245
bevela: 88
bevelb: 88
mitrea: 86
mitreb: 86

part number: 9
number off: 90
length: 0.247
bevela: 88
bevelb: 88
mitrea: 86
mitreb: 86

part number: 11
number off: 120
length: 0.252
bevela: 88
bevelb: 88
mitrea: 86
mitreb: 86

part number: 10
number off: 240
length: 0.255
bevela: 88
bevelb: 88
mitrea: 86
mitreb: 86

part number: 12
number off: 240
length: 0.256
bevela: 88
bevelb: 88
mitrea: 86
mitreb: 86

part number: 13
number off: 120
length: 0.262
bevela: 88
bevelb: 88
mitrea: 86
mitreb: 86

part number: 14
number off: 120
length: 0.263
bevela: 88
bevelb: 88
mitrea: 86
mitreb: 86

posted by
simon

16/01/2009 19:12:35

Thanks for that Paul.

I posted the above as requested, but I wonder that something more sophisticated is required for such a high frequency sphere, because just simple point-connected struts will invert and errors in strut lengths will aggregate.

Simon

posted by
Peter

22/01/2009 11:12:06

Hi,I was wondering if the strut lengths had allowed for the dimensions of the centre hub or is does that measurement have no relevance.

posted by
Simon

24/01/2009 01:46:53

Hi Peter.

The calculator's strut lengths are actually the straight-line distances between vertex points, so no, you'll need to adjust the lengths according to the design. For example, if the struts bear on 2 inch sections of pipe then you'd need to cut the struts just over 2 inches short (it's actually d/sine(a) short, where d is the hub diameter and a is the mitre angle).

Simon

posted by
frank

28/01/2009 21:15:15

hi,
i was checking various dome calculators on the web and all give the relation to V,radius, strutlength and factor. what i can´t find is a way to calculate the angle in which the conectors have to be. i am planing to build a 4V dome with a radius of 3m. the struts will be made of 45mm tube, which on the end will have a plate with an angle welded to it with a hole, to connect all tubes. (see attached image. how do i calculate the different angles for the different struts for a 4V dome with a 3m radius???. thanks to the mathematicians in the house
frank

posted by
Bill H

17/02/2009 18:53:50

First, thanks so much for this site. This is the only site I've found with all the info required -except... I am planning on building a wood strut 3V 3/8 dome. What longitudinal angle should the struts be cut at to provide good strut & panel mating? Can you provide a formula for this angle? Thanks for your time.

posted by
Ken

18/02/2009 02:41:27

Frank,
I found on another website this tidbit: 4v dome: bend all struts 7º-9º on each end. I think if you were to bend at 8 degrees the difference would tighten up with the bolts.

posted by
thom

16/04/2009 08:10:56

wonderful site !
do these calculators calculate in feet/inches or only meters ?

posted by
randal

19/04/2009 20:43:06

to keep strut true could you not cut a two way angel on each end

posted by
rui

02/05/2009 22:11:12

I need a site that has how to calculate an elliptical dome?
see attached model

posted by
cliff

03/05/2009 23:53:03

Thankyou for a great and needed site, Im considering a large geenhouse and after reading a few of the posts feel anyone wanting a large poly covered dome needs a 6v or 9v calculator so the openings dont flap in the wind. or consider very heavy guage poly. thanks so much !

posted by
simon

04/05/2009 21:17:55

Hi Rui, maybe I can help. What's your specification and what design data are you looking for?

posted by
Isaac

20/05/2009 03:48:33

Hello, first off great site. :)
I also need to find a calculator for a 9v dome. The diameter is 60Ft. a point in the right direction would be greatly appreciated.

posted by
Paul Kranz

01/06/2009 20:09:17

Simon, where did you get the chord factors for the 9V icosa?

posted by
simon

04/06/2009 23:46:50

Hi Paul

I've done the math and wrapped it up in a Java program. It's public domain so you're welcome to it if you can make any use out of it, but it really needs attaching to a nice front end to be really useful. It'll do any frequency of any platonic solid, superellipsoid and parabolic. It'll do trapezoidal domes too. I'm not actively working on it now so I'd really like to find someone to take it over.

posted by
Kenneth Samuel

16/09/2009 10:48:38

Hi there,
Thanks for this site.... This was what i was looking for...Though i was a little dissapointed to not find more than 3 frequncy Domes. Anyways as the cliche goes - Something is better than nothing.
Thanks a lot... This site indeed was a great help... Looking forward for something more from you.

posted by
Nick

17/09/2009 16:02:32

Great site.found it trying to design my pizza oven!

posted by
the bazwan

07/10/2009 06:05:36

This is a great site,complete demystification,could you please enlighten me even further,by advising me weather the hub angles change when moving from a 3v to a 4v dome,and is there a dome calculator for such a beast.One other problem I have to consider,is that the dome would be in a5/9 configuration,thanks again.

posted by
Gerry

25/11/2009 14:16:28

Hmmm...If I enter a dome radius of 100 units, your calculator gives a floor area of 30,900 sq. units. So your calculator is using the following formula (or equivalent): Floor area = 3.09 x R squared, where R is the radius. But this is significantly off the mark. The formula should be 2.94 x R squared, which gives a floor area of 29,400 square units. Or, using a more precise coefficient, namely 2.938926, I get an area of 29,389.26 square units,
To derive the coefficient, divide the floor into 10 identical isosceles triangles. Each will have the following edge lengths: 100, 100 and 61.803399 (edge B is the base of the triangle). The area of an isosceles triangle is half the base length times the altitude. The altitude in this case is as follows: square root (100 squared - (61.803399 / 2) squared) = square root (10000 - 954.91503) = 95.105652. Now, multiplying the altitude by half the base length, we get a triangle area of 2,938.926. And muliplying that by 10, the number of triangles in the dome floor, I get an area of 29,389.26 square units. This number divided by the square of the radius (100 x 100) is the coefficient for calculating floor area.
There are several other options for calculating floor area. Here is an easy formula for anyone comfortable with trigonometry. It can be used for those domes whose floor is a regular polygon. In the case of the 2v icosa hemisphere, the floor is a regular decagon (10 sides).
Area (A) of a regular polygon:
A = s squared x n / [4 * tan (180 / n) ], where s is the side length (61.803399), n is the number of sides (10), and tan stands for tangent.
A = 61.803399 x 61.803399 x 10 / (4 * tan 18)
A = 38,192.4 / (4 * 0.3249197)
A = 29,389.26

posted by
Gerry

25/11/2009 14:52:47

Hi again,
My earlier comments about dome floor area pertain to the 2v calculation tool.
Gerry

posted by
Sagaro

13/01/2010 10:54:26

nice site, any info on the double miter angle cuts for a 6v dome, you know, the other angle u have to cut if you want your struts to meet cleanly at the vertex point.

posted by
Tim P

26/01/2010 17:39:18

Hi, I am looking into building a 100' dia. dome for a horse riding arena. I would like to use steel tubing with vinyl fabric cover. Any specs available?

posted by
Gerry

31/01/2010 17:08:39

Hi Tim,
Sounds like an interesting project. There are lots of design options availabe for a large equestrian dome. But two key factors in selecting an appropriate geometry (especially geodesic frequency)for your dome are the gauge of steel tubing available and the roof loads that must be accommodated by the design. I'll dig out an example of a high-frequency layout and post some numbers on a new thread.
I'm not an architect or engineer, just a dome enthusiast with an addiction to spreadsheet calculators. I've helped a few commercial builders with geodesic calculations for large buildings, and I've built three small domes, myself, one of which is my capentry shop & summer office. Cheers.
Gerry

posted by
Tim P

27/02/2010 22:15:01

Hi Gerry, Thanks for responding. I've been out of town, but any info I can get would be helpfull.I live in northern upper michigan and we do get a lot of snow. Local code calls for 80 lb. snow load.

posted by
Gerry

05/03/2010 17:39:06

Hi Tim P.,
A while back I posted a message to you in a new thread called Tim P's horse riding dome.
Cheers,
Gerry in Quebec

posted by
Taylor

04/05/2010 07:30:07

Hi, I am in the midst of preliminary 2v construction: Do the A struts get cut at the same 16deg angle at each end, or do the ends which meet the B's get cut at 18deg instead?
Thanks for the site!!

posted by
Hart

07/06/2010 16:48:01

Hi, I am part of a team designing and building a new dome and need some advice, we are proposing a dome which will be 27.88' (8.5M) diameter, to be used as a telescope observatory dome. One of the team is able to pre-fab the struts and is proposing to use aluminium or steel box section (not sure of the gauge yet), would you advise using a 3v or 4v base for a dome this size, it will need an apature of about 1M wide to cover a declination of 0 to around 85 degrees. any help/advise would be apreciated or if you could point us in the direction of someone who may have built something similar. thank you in advance!

posted by
moges

26/06/2010 16:04:13

Hello, i wanted to know the dimensions of my fixed dome biogas digester. How can i use this? Is there any better tool?
txs

posted by
Robbie j

10/07/2010 12:27:47

Brilliant site mate, ive been looking for this for a couple of years! i have a 3v frame that has a 5 mtr dia and i want to make a canvas covering for it so i can use it as a tent (with a calor gas bottle as a wood burner and a chimnea and all that) at festivals etc, can you help me or point me in the right direction for the net needed for the covering?? any help at all would be great. Ta...

posted by
Steve

12/08/2010 22:07:16

i wanted help on how many poles etc to make a40ftsq Party Geodome
we used one supplyed @ a festival and found it brilliant could any one help
Thanks

posted by
dess

30/08/2010 15:06:47

I'm planning a 6m radius 4v dome using 48mm alloy tube ( scaffold ) with star-shaped SS connectors bent to angle and bolted through.
Maths not strong - anyone able to tell me the angles for each of the connectors - developed then the angle to bend each of the arms? Many thanks

posted by
Mike W

27/09/2010 22:27:02

Thanks to your site, I built my first 3V dome out of electrical conduit and everything worked out great. Cheers

posted by
joni

07/10/2010 10:50:55

Hi. Is it possible to use this magic to build an egg shape space? I mean as if the egg is on its side cut through, so it is long with a small end and a big end? I have an awkward space to fill for a workshop space.

posted by
Sean

26/01/2011 08:13:06

Hi there. Thanks for a really great tool its been very helpful. Is it possible to calculate the two lower angles of each trapesium given only the radius and the height of each trapesium. Im building a brick dome for a pizza oven so the HEIGHT of each trapezium in my dome is constant.
and im using the bevel on a circular saw to get the compound mitres for the sides so using the 'x' trut as a constant doesn't work
warm regards
one confused brickie

posted by
michael mitchell

22/02/2011 09:36:22

great site, 2 times sin of 1/2 theta.
this is the formula for domes according to bucky. Is this right? radius is one.

posted by
Petkov

01/03/2011 17:33:30

Thanks for this site. Trying to find computers at 9V. Can anyone help me?

posted by
Gerry1

29/03/2011 18:17:16

Petkov: Google the following: Rick Bono Windome. This is a free geodesice calc program. You'll find it at Google's GeodesicHelp Group. It gives chord lengths, face angles, and axial angles for any frequency you want for icosa and octa domes.
- Gerry in Quebec

posted by
Paul

25/06/2011 03:32:49

Simon: Did you ever find someone to take over the Java program?

posted by
Jasmine

25/08/2011 12:36:49

Hi, I am looking into building a 100' dia. dome. I would like to use steel tubing with vinyl fabric. Could please suggest the frequency to use 15V or 16V and please guide me to site which calculate any frequency calculations.

posted by
Ozren

26/08/2011 18:48:48

Hi, I am trying to build a 3V dome using pannels. Does anyone know the best way to figure out the different angles between pannels? I made one out of polystirene and toothpicks but the angles were wrong

posted by
Sebastian

21/09/2011 21:53:06

Hi! I hope somebody of you can help me. I have one question:
I want to build a 3V dome with 5m in diameter - therefore radius would be 2,5m or 2,734033246 yards. Strut A would be 0,95, B 1,1 yards in length and Strut C 1,13. The difference is tiny.I built up a 3V dome in CAD (rounded to the 6th decimal point) and found it still hard to get the dimensions right. Is it right, that due to the complexity of the structure there will always be some deviation. Is this right? And how can I overcome this problem? Thanks very much!

posted by
kieran

23/09/2011 13:27:04

Any plans to finish off the 4v tools? I would really appreciate a similar color coded layout of all the struts if anyone has one. The same for 5v would be great too if anyone has that.

posted by
Kieran

10/10/2011 17:07:26

Has anyone got the vertex angles for a 4v dome?

posted by
KB

11/10/2011 15:57:08

I would like to build a 3 frequency 12 ft. radius dome. I found the listing indicating number of pcs and lengths required but I wonder if this is end to end, center to center of hole, what is figured for flattening, etc.

posted by
kory

27/12/2011 14:27:30

exactly what i was looking for. thanks for the site thanks mate

posted by
tom

08/01/2012 01:51:35

Hi KB, just curious, what material are you going to build your dome with....I am intereseted in building a monolithic dome and believe this site could help me in constructing my airform...

posted by
Leland

08/01/2012 16:03:25

I would like to make steel hubs for a 4v 32'dia. I need the angles for all. Could anyone help me?

posted by
jason

11/01/2012 01:37:27

I am looking for a formula for suface area of a quonset. The dementions of this particular building are 50X60, 18' to the peak with a coorigation on 1.15.

I am planning to make a Dome from insulating board. Calculating the size of the panels is easy with the great calculation tools. The problem I have though is how to calculate the angles along the edge of the boards. Is there a calculator for this or a math equation anyone knows of to do this. ?

posted by
Dom

15/02/2012 18:51:56

I want to build a dome using thick insulation panels. How do I work out what angles to cut along the panels edges?

posted by
Admin

15/02/2012 21:02:01

HI Dom, Yes there is a way to calculate this angle, it's called the dihedral angle between panels. Look at the bottom of the dome calculation page and you will see a diagram that shows all the dihedral angles. For example a 3v has two different angles 166 degrees and 169 degrees

Here's the formula: (Dihedral angle) divide by 2 then take this away from 90. 166/2= 83 take 83 from 90 and you get 7 degrees, that's the angle you cut.

Good luck with your project.

posted by
condog

27/02/2012 05:05:37

are the measurments in metric or still in imperial? i cannot find anywhere on the site

posted by
blue

24/03/2012 22:17:56

i need to make a project about mini elliptical domes for algebra. any ideas how?

posted by
john

27/03/2012 16:49:12

hello im building a 19 foot circumfrence dome i need the degree cut for a b and c struts on both ends please help trying to build myself never done algebra need answer in feet and inches please

posted by
Cindy

07/04/2012 02:19:31

Art project, using a geodesic dome as a structure for a clay project demo. I have a structure kit i can use of steel which will work great and hold weight of clay. Being bad at math, what I need to know is how much clay will I need to cover a 6' dome with one inch of clay? Can you help me figure this out? The idea is to put together the dome, cover with chicken wire and then one inch of clay and attach multiple sculptures in clay making a large sculpture of one. So I am down to trying to find how how much clay we will need to cover it before adding our clay sculptures.

posted by
Knud

15/10/2012 21:20:37

Cindy,
Calculate the volumen of 2 domes
Dome1 with radius = x
Dome2 with radius = x+1
Dome2 - Dome1 = volumen of clay
Hope it helps
Knud

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