Dear
toura,
Stargazer2006 and
Justo Miranda!
Thank you very much for your responses! I am really impressed with your quite informative answers. Overall impression is that sources I used before are only speculative regarding further development of Ar-232 project.
I also performed some search. I found the following project list:
http://www.luft46.com/pjtlstar.html
Looks like float-plane version of Ar-232A (illustration of which was provided by
toura) is mentioned there as E.401 "Ar-232 float version project".
Ar-532 and Ar-632 are possibly E.532 "Transport project" and E.632 "Transport project" in the same list. No technical details are provided. I am probably messing with combined RLM and internal Arado project numbering systems that look likely. From description provided for Ar-532 and Ar-632 by
Stargazer2006 it is clear that 30 t is not a payload, but rather an allowed weight on takeoff (thanks for original text!!!) which is confirmed by information provided by
Justo Miranda.
My calculations show that it is quite feasible to use 4xBMW-801A (4x1600 hp=6400 hp) to lift 30 t aircraft at takeoff with wingspan of 45 m and wing area of 220 m^2. Though using 4xBMW-801F engines (about 2400 hp vs. only 1600 hp for BMW-801A in Ar-232A) it is possible to lift 30 t of payload. Resulting takeoff weight of aircraft in this case is something like 75 t which is comparable to Me-232Z! Power is equivalent to 6xBMW-801A which possibly caused many sources to speculate about 6 engines.
Again, from my calculations 4xBMW-801A (6400 hp resulting power) could be replaced by 6xBMW-Bramo (7200 hp resulting power) increasing wingspan to 50 m and wing area to 250 m^2. This is another possibility for speculation about 6 engines.
E.441 "Transport project" is also mentioned in the project list that I found but no details were given.
Thanks!
-Alex