Editing Heinkel He 100 (section)

=== He 100 V2 ===
The second prototype  He 100 V2 addressed the stability problems by changing the vertical stabilizer from a triangular form to a larger and more rectangular form. The oil-cooling system continued to be problematic, so it was removed and replaced with a small semi retractable radiator below the wing. It also received the still-experimental DB 601M engine which the aircraft was originally designed for. The M version was modified to run on "C3" fuel at 100 octane, which would allow it to run at higher power ratings in the future.

V2 was completed in March, but instead of moving to Rechlin it was kept at the factory for an attempt on the 100&nbsp;km (62&nbsp;mi) closed circuit speed record. A course was marked out on the Baltic coast between Wustrow and Müritz, 50&nbsp;km (30&nbsp;mi) apart, and the attempt was to be made at the aircraft's best altitude of {{convert|5,500|m|ft|abbr=on}}. After some time cleaning out the bugs the record attempt was set to be flown by [[Captain Herting]], who had previously flown the aircraft several times.

At this point [[Ernst Udet]] showed up and asked to fly V2, after pointing out he had flown the V1 at Rechlin. He took over from Herting and flew the V2 to a new world {{convert|100|km|abbr=on}} closed-circuit record on 5 June 1938, at {{convert|634.73|km/h|abbr=on}}. Several of the cooling pumps failed on this flight as well, but Udet wasn't sure what the lights meant and simply ignored them.

The record was heavily publicized, but in the press the aircraft was referred to as the "He 112U". Apparently, the "U" stood for "Udet". At the time the 112 was still in production and looking for customers, so this was one way to boost sales of the older design. V2 was then moved to Rechlin for continued testing. Later in October, the aircraft was damaged on landing when the tail wheel didn't extend, and it is unclear if the damage was repaired.