Rodrigo,
I've never seen a Brastemp machine in person, but based on everything you have in your collection, I would guess that your models are more or less equivalent to the 24-inch machines we had, just like James said above.
Sears stated in operator's manuals of the 1960s that the maximum fill on a 24-inch washer was 17 gallons, and on the 29-inch counterparts it was 18, or only 1 gallon more. The basket diameter in the U.S. was only an inch or so less. Interestingly, at some point in the late 1970s, the full-fill amount on 29-inch standard washers was decreased by one gallon, probably to help with the new energy guide ratings that had come on the market, so they used the same amount of water as a 24-inch.
Sears never offered the Roto-Swirl in the 24-inch machines, at least not that I am aware of, and all machines seemed to have one of the two Straight-Vanes or later a standard-capacity version of the Dual-Action. These both have narrower skirts than some of the other agitators that were offered. There were some obscure high-end 24-inch models that I've never really seen which may be exceptions to what I said, but with only 1-gallon less water in a 24-inch washer, it would seem like they would hold almost as much as a regular 29-inch machine.
Now that I have some experience with standard capacity machines after so many years of using large cap models, my only observation from a usability standpoint is that large or bulky items such as big bath towels or Levis jeans wash more easily in a large machine, as there is more room for them to thrash and move around. I would think this even more noticeable if comparing a 24-inch washer of slightly smaller diameter.
Gordon
