And where do these new dates come from?It also seems that the V1 Ju89 first flew in December 1936, while the V2 was flew in early 1937. The V3 was due in early 1937 too, but it began the switch to the Ju90 on January 1st 1937. The project was cancelled on April 29th 1937 rather than the first flight occurring then.
On April, 11th 1937 the Ju89 prototype D-AFIT (V1, c/n 4911) was first flown by Hesselbach. Short time after the first flight, on April 29th 1937 the further developement of both strategic bombers was cancelled by the RLM.
Really? IF that December date is correct...then it's going to be far closer to 6 months at least...given that European winter is going to interfere with a regular testing schedule!So testing started in late 1936 for the basic version and would have been completed in IIRC about 3-6 months for the V1.
By the way - if you look at that AND the Wiki entry, the Ju 89's testing regime was actually quite prolonged
In the case of the V1 aircraft D-AFIT...a year and a half!The second Ju89 prototype D-ALAT was finished in July 1937, but the third prototype V3 was stopped after the program was cancelled. Both prototypes were used for extensive flight tests to get experiences about the stability and flight controls of large aircraft. On June 4th 1938 Kindermann achieved a new Payload/Altitude World Record with the second prototype D-ALAT with 5000 kg payload at an altitude of 9312 m. On June, 8th 1938 he reached with the same aircraft an altitude of 7242 m with 10000 kg. In late 1938 both aircraft were transfered to Luftwaffe, where they were used as heavy transport aircraft