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luftluuver
02-01-2006, 01:43 PM
Butch2k on the 109K-4

Posted Wed February 01 2006

"A 1944 K-4 should be equipped with a DB605DM at 1.75ata since delivery of DB605DB did not occur until mid january 1945. The DC which were basically the same engine were to be delivered in the DB configuration until the 1.98ata boost was cleared.

By february 1945 orders were issued to begin tests of the DB605DC set to 1.98ata, and plans were made to convert existing squadron with DB605DB engines to DB605DC standard.
What is not known is to what extend it was done before war ended as we do not know whether testing was positive or negative and if the former at what time the DC was considered operational."

"Just to correct some confusion about the C3 issue.

When first issued the DB605DM/ASM/AM were required to use C3 fuel, and it was not until some time that those engine were cleared to use B4 as well. It required some timing adjustement as well as some nerves since a failure of the MW-50 system in such a configuration broke the engine almost immediatly.

So it's quite normal to see C3 markings on a K-4 or G-10 it does not mean by anyway that the a/c is actually using a DB605DC.
for instance almost all K-4 of the 330xxx-333xxx batches wear a C3 triangle while the later 334xxx batch a/c are wearing a B4 triangle."

"It flew but to what extend tests made by the II/JG11 with the DB605DC at 1.98ata were positive is not known at this time. Early reports of the 1.90ata test underlined spark plugs troubles as well as mechanical troubles and the insufficient cooling of the 109. Those troubles prompted the decision to deliver all DC engines set to DB standard at 1.8ata.
All those events took place in february, and plans were made to clear it for operational use as underlined by planned unit equipments listing. Now it remains to be seen to what extent it was done before the war ended."

luftluuver
02-01-2006, 01:43 PM
Butch2k on the 109K-4

Posted Wed February 01 2006

"A 1944 K-4 should be equipped with a DB605DM at 1.75ata since delivery of DB605DB did not occur until mid january 1945. The DC which were basically the same engine were to be delivered in the DB configuration until the 1.98ata boost was cleared.

By february 1945 orders were issued to begin tests of the DB605DC set to 1.98ata, and plans were made to convert existing squadron with DB605DB engines to DB605DC standard.
What is not known is to what extend it was done before war ended as we do not know whether testing was positive or negative and if the former at what time the DC was considered operational."

"Just to correct some confusion about the C3 issue.

When first issued the DB605DM/ASM/AM were required to use C3 fuel, and it was not until some time that those engine were cleared to use B4 as well. It required some timing adjustement as well as some nerves since a failure of the MW-50 system in such a configuration broke the engine almost immediatly.

So it's quite normal to see C3 markings on a K-4 or G-10 it does not mean by anyway that the a/c is actually using a DB605DC.
for instance almost all K-4 of the 330xxx-333xxx batches wear a C3 triangle while the later 334xxx batch a/c are wearing a B4 triangle."

"It flew but to what extend tests made by the II/JG11 with the DB605DC at 1.98ata were positive is not known at this time. Early reports of the 1.90ata test underlined spark plugs troubles as well as mechanical troubles and the insufficient cooling of the 109. Those troubles prompted the decision to deliver all DC engines set to DB standard at 1.8ata.
All those events took place in february, and plans were made to clear it for operational use as underlined by planned unit equipments listing. Now it remains to be seen to what extent it was done before the war ended."