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Originally Posted by ouidjat
As for VDM 12087 instead of 12159 on that machine ... This is not surprising since a reco machine is not supposed to make interception at high altitude but to be able to do it fast at low. medium altitude. And the VDM12159 wasn't suited for that.
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Well, it's (relatively) surprising because DB 605AS were to be fitted with 12159A, irrespectively of the airplane's task, but for sure it's not the first photo of such type of engine-propeller combination.
Theoretically ,12087A vs. 12149A will give just 3-4 km/h of advantage for the former at low altitude, and ~10 km/h for the latter at high altitude. In flight tests both gave equal speed down low.
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By the contrary Dahl machine here under wasn't an AS but for sure got MW50 and VDM12159 for high interception ....
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Why MW50 "for sure"??