Quite an interesting source !
"20.February 1945
For the concept of a high performance fighter with increased endurance, the design bureau of Prof. Tank
used the describedproject with a Jumo 222 E/F engine.
Two proposals are made: High performance fighter with Jumo 222 E/F and with Argus As 413, besides the engine
there are only few dimensional differences.
Propulsion:
1 Argus As 413 with 4000 hp take-off power, driving contra rotating props with 3.5 m diameter via a long shaft
Dimensions:
span 15.2 m, sweep angle 24 ° in 0.25 chord (?), wing area 42 sqm, aspect ration 5.5
length 15.350
height 4.7 m
Weights: NO DATA AVAILABLE
We can proceed on the assumption, that take-off weight would have been around 10 to 10.5 t
Performance : NO PERFORMANCE CALCULATIONS AVAILABLE
We can proceed on the assumption, that performance would have been somewhat better, than for the
high performance fighter with As 413 from 1. October 1944, with the exception of the endurance, which
would have been around 3 hours, using maximum cruising power at 10 km height.
Military equipment:
Armament:
1 MK 103 with 30 mm calibre in the nose
and 2 MK 103 with 30 mm calibre besides the cockpit.
"
This part seems to come directly from a contemporary document, please note the lack of performance and
weight data.
The next part certainly is a interpretation by the author and to my opinion a very good one:
"On condition that the time for development of the structure would have been normal and propulsion system
readily available, the German airforce could have get this aircraft maybe in 1948. Considering the quick development
of jet fighters, which in addition generally had a lighter and easier structure, even in 1944 the reason for such a
design must have been doubtful. For an interim timeframe, the improved Ta 152 could have taken the tasks for an
piston engine driven high performance fighter.
Nevertheless, for the reader, who is interested in aviation, these designs still have some kind of fascination, as they
marked the last stage of these developments, which stamped that era."