What maximum diameter for skylight / tono?

[Drunken hobbit]

How big can I make my skylight hole / tono?
I reckon I could go as wide as 6ft (about 2 meters), if not more. 3m would make it look stupid maybe.
I guess the only thing that limits the diameter of the skylight hole would be the rigidity of the tono ring? Just build it stiff enough so it doesn't flex or warp under load.
Laminated ply and epoxy is my planned building material for the ring... more simple than the timber and ply sandwich I did for my home-yurt.

I'm thinking of starting my third yurt build, to go alongside the one I live in. I built a 16 ft, a 20 ft, and now I'm planning a 25 to 30 ft for a workshop/boat-building space.
There needs to be a lot of light inside, so as well as the big tono skylight I plan to roof it with some clear cover panels to let the light in.

Cheers in advance for the suggestions regarding the maximum size of the tono.

[Drunken hobbit]

I read that the traditional size of tono is 20% of yurt diameter. If I build a 30ft yurt and have a 9ft tono (3 metres), that's 30% of yurt diameter, which looks okay when I draw a scale plan.
It's a huge heavy bit of wood at 9ft though!

[Bob Rowlands]

Beats me I'm no engineer. Good luck. BE SAFE!

[James]

hello it will hold but it will look stupid and you will be having to replace the stick more, go with the 20 percent rule also think of the heat you can alway put windows in measure the traiaglar latice work your wall and put cheap pexiglass in them that way you do not have a weaken structure and it looks cool