A question about DB 601E start - und notleistung ( start - and emergency power ) and Kommandogerät

[AX2]

DB 601E start - und notleistung ( start - and emergency power ) is 2700 RPM 1.42 Ata. Allowed one minute

 

To have start and emergency power ( Kommandogerät ON )  you must push a switch in cockpit.

The emergency power is turned off automatically after a one minute by Kommandogerät , and the engine is not damaged.

 

 

The question. 

I'm right or not ? 

[wastel]

first guess..wrong

 

never read anything like this about the 109 in any manual

btw, only the 190 automatic system was called Kommandogerät.

 

The 109 system did more or less the same, just on an much simpler way.

 

Start&Notleistung was just full throttle setting.

 

The pilot was responsible for decreasing the power setting when the engine limit is reached.

If the engine systems (coolant & oil temp) was within its range, the 1min power setup could be

used longer. Just the engine wearing was increased and the engine was worn out faster.

The Motor did not explode after 1min.....

[AX2]

Thank you very much for the explanation .! 

 I was confused in many ways.  

 

 

 

[303_Kwiatek]

1-minutes clock take off power was in older versions like 601A and 601Aa used in 109 E.

 

Later full throttle mean Start und Notle.  -  but in many cases it was initialy blocked due to engine problems -  like in 601N, 601E and 605A.

[Kurfurst]

There is no "hard" 1-minute limit for the 601E/109F for max power. Such time limit device was only present on the 109E/601A powered planes.

 

On 109F basically you just slam forward the throttle for max power and can leave it there until the engine melts...

[DD_bongodriver]

Which could happen any time after a minute.

[Kurfurst]

Yeah anywhere between 1 minute and 100 hours, the usual type test for an engine at max power before clearance. Thanks for pointing that out bongo, you have been as informative as ever.

[DD_bongodriver]

Sure, max continuous power, but emergency power? 100 hours? please!

Edited April 4, 2014 by DD_bongodriver

[Kurfurst]

Yes. For example Merlin 66 main components, for example, could fail anywhere between 30-40 hours running at emergency (maximum) powers in 1943. A 100 hour endurance test at maximum rating was not achieved before strenghening and redesigning components by late 1943, and engine so modified designated Merlin 100.

 

German standards were similar - Jumo 211 endurance tests I have show iirc 170 hours at max. rating (stressing the engine several hp less than in case of the M66, for fairness).

 

Even early batches of DB 605D, that had early troubles with faulty sized pistons delivered by subcontractors and valve assembly deficiencies, and as a subsequent result of temporarily ban om their 2000 HP rating, could run in cases at 2000 HP for 40 minutes straight (in contrast to 10 minutes in the manual).

 

Because of mass production tolerances and because practical use stress is usually much worse then bench testing, there is plenty of reserve before approval of a new rating. Also keep in mind that the 601E emergency power was producing only 1350 PS, which was subsequently cleared for 30 mins on the 605 series due to improvements in the design.

[NZTyphoon]

The Kommandogerät:

 

and the DB 603 & 605 systems:

 

 

 

[NZTyphoon]

Yes. For example Merlin 66 main components, for example, could fail anywhere between 30-40 hours running at emergency (maximum) powers in 1943. A 100 hour endurance test at maximum rating was not achieved before strenghening and redesigning components by late 1943, and engine so modified designated Merlin 100.

 

 Apart from being undocumented, this shows a basic ignorance of Merlin variants: the Merlin 66 continued to be built in quantity as the Merlin 66 until late 1945 - the only thing the Merlin 100 had in common with the 66 were the same supercharger ratios and similar construction, otherwise the Merlin 100 had an S.U single-point injection system, rather then a Bendix injection carburettor and was built in very small numbers before being further developed into the 113/114 used in late model de H Mosquitoes.