:-X The DE-607 was a similar diesel in architecture and size at "603" for 1750 hp. It was abandoned and did not go into production.This was a four-stroke diesel engine, whose initial development was at the behest of Lufthansa, later however its usefulness to long-range military aircraft was also realised. The first engine was running in 1939, however the V3 and V4 (1940/41) were only experimental engines. Dimensions were similar to the DB 603. Take-off power was 1100 KW (1,500 HP) and with development should have reached 1285 KW (1750 HP) at 1500 rpm. If this had been successful then with a weight of 860 kg a power to weight ratio of 0,49 kg/HP would have resulted. Sources differ as to when it was cancelled, the earliest states 1941 the latest October 1942.DB 630, a 36 cylinder Double W engine with a capacity of 89 litres and output in the 4,000 HP class (2,940 KW). Dr. Berger calculated the optimal cylinder arrangement angles should be 40° + 40° + 100° and it was designed to use only one crankshaft. Development was abandoned in April 1943.