70" x 53" on ours. I suppose if you removed the seat back cushions it would gain another 6".

[QUOTE=mregan;14674]Does anyone know the length of the center berth or what is the size limit for an adult. Currently have a C-30 and at 5'11" I can just about fit but there is not enough room to stretch out.[/QUOTE]

Which boat are you looking at? MKI or MKII? "L" settee or "U" settee?

I'm also 5'11" and on our MKI with the "U" settee, I can't stretch out unless we move the backrests at both ends. However, with those cushions removed its my favorite place to sleep unless its too hot when we move to the V berth which is both roomier and better ventilated. My main reason for prefering the settee berth is the ability to get up with out needing to get my feet past my head as in the V.

The aft berth is also quite roomy and is not a bad place to sleep when temps allow. The fact that I can be comfortable in any of the 3 "cabins" is one of my favorite things about the C36.

I use the settee berth as my bunk when at sea. I lower the table to about 5 inches above the cushions to act as my lee rail, to hold me in the bunk in a seaway. Effective and convenient. At 5'8", I remove two back cushions to gain a comfortable width on the seat. If I have crew taller than me, I remove all back cushions, to make room for them to sleep, and also to make it easier to get in and out when bundled in foul weather gear.

Of course I always brief those aboard to sleep feet forward. In case of the vessel striking an object there in less likelihood of a broken neck. Now, with the Fukushima tsunami debris reaching the US west coast, this is all the more important.

On my MkI, I found a solution to being 6'4" with a nearly 6' wife. Not fancy yet, but put some back cushions and other bits into the footwell, lower tables on both sides, and drop in cross wise an inflatable king size mattress. Bingo, in a moment I have a king size bed that I don't have to pretzel out of. I put a photo on another thread I started. Eventually I'll make a drop in platform from plywood for support, just like I did in the aft berth (where the backrest fits perfectly).