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The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
Today, I bought a Coleman Queen sized (60" x 80") air mattress(Walmart $23.95) and gave it a test fit on the boat. I first lowered the dinette table and installed the tabletop cushion. Next, I removed both access boards from the starboard settee and the one on the aft dinette seat and placed them over the cushions spanning the aisle. This gives support to the mattress over the aisle. Then I simply blew up the mattress, set it in, and it fit perfectly.
I brought along some 1/2" x 2" oak planks to use as slats under the cushions in the areas where I removed the access boards, but I found that the stiffness of the air mattress over the cushions was more than ample to prevent the mattress and cushions from caving into the voids.
I did cut three slats to use at the very aft end of the settee, because with the mattress installed, there is still about a foot and a half of the starboard settee cushion exposed. The slats prevent the cushion from falling into the void.
Now my wife and I have a nice, large sleeping area(kids are relegated to the V-berth), and it was easy and inexpensive.
The "queen size bed dinette conversion" was the first thing I did to both my Catalina 22 and "Quiet Time" when I bought them. It is really the only comfortable sleeping arrangement when you are my size (6'-2", 300#). The V-berth and quarter berth have never been slept in on "Quiet Time" since I got her, although I suppose someday I'll have an overnight guest and someone will have to sleep in the V-berth. I took out the quarter berth cushions years ago and use that area for storage of sails, the pop-top cover, ice chests, etc. The atorage under the V-berth connects to the bilge so so i don't like to put anything in there that would be harmed by moisture or mildew. Despite my best efforts to seal the windows, there always seems to be a gallon or two of rain water in the bilges after winter rainstorms.
Larry Charlot Catalina 25 #1205 "Quiet Time" Sacramento, CA
Interesting idea to use an air cushion. I followed a tech tip on this site and made a 'T' shaped plywood insert for the aisle and the part of my dinette table that does not come out to the edge of the aisle. I had a local weld shop make up some metal 'U' brackets with an 'L' shape flange at the aisle and put them over the wood rail at the seat cushions. The only thing I don't like is the brackets scrap the wood trim. I have seen this done in another boat with a continuous wood ledger on both sides about 1/2" wide. Narrows your aisle by 1" though.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.