109 prop pitch (rpm) and the supercharger

[Robo.]

Originally Posted by Crumpp

All done to maintain 2600 rpm!!!

No Crumpp, you're wrong. Please stop arguing.

IvanK that's the (in)famous document, may wonder about the date added by pencil. To me it seems that even if the date is post-BoB, the practice of overreving the engine above FTH was common during the Battle. Steinhilpers quote for example is dated 27.10.1940.

[IvanK]

Agree Robbo

[Crumpp]

It would also appear to be conditional on Auto Prop pitch installation.

No, it says the automatic device has to be modified in order to use the increased rpm.

Until then, a switch to turn off the automatic device is necessary.

In otherwords, if you have an automatic propeller, you must turn it off and use the propeller as the original selectable pitch propeller.



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[ACE-OF-ACES]

Originally Posted by Crumpp

No, it says the automatic device has to be modified in order to use the increased rpm.

Increase..

Not maintain?

Well better late than never!

So.. Is it safe to assume that I can put you down for a vote for Steinhilper over Crumpp?

[Kurfürst]

Originally Posted by IvanK

Regarding this quote that has popped up in this thread:

"To increase the performance of the Me 109 an increase in the revs for a short time at heights over 5.5 km. will be in future be
permissible. For the DB 601 A engine the normal maximum revs are 2400.
Above full pressure height they may be for a short time be increased
from 2400 to 2600."

Here is the source document for this quote. ...

Already posted in post number two in this thread.... This might be more readable:

It would also appear to be conditional on Auto Prop pitch installation.

I disagree, quite clearly its not conditional to whether auto prop pitch was introduced or not. The situation was that APP system was not yet set up to maintain anything more than the nominal max. rpm. There are some promises that at some later stage the settings of the auto prop pitch will be modified to ease the burden on the pilot by taking care of the maintaining the increased rpm ratings automatically. Until then pilots had to revert to manual prop pitch control.

Originally Posted by Robo.

No Crumpp, you're wrong. Please stop arguing.

IvanK that's the (in)famous document, may wonder about the date added by pencil. To me it seems that even if the date is post-BoB, the practice of overreving the engine above FTH was common during the Battle. Steinhilpers quote for example is dated 27.10.1940./QUOTE]

Agreed as well. It seems to me the RLM merely sanctioned a long existing practice (given that mechanically there was nothing to prevent pilots from overrevving anyway).

[TomcatViP]

Note that the Thumb switch (early HOTAS!) was present only in the E4 and beyond.

[kohmelo]

Originally Posted by TomcatViP

Note that the Thumb switch (early HOTAS!) was present only in the E4 and beyond.

Did'nt they build the first actual joysticks too? for Ruhrstahl X-4 (prototype), Henschel Hs 293 and Fritz X.

Just wondering about that implementing autoprop to give more rpm to airplane:
I have some memory about reading that after F or G models it was not recomended/preferred to use manual pitch. --> Still I really can't remember where i read that.

[Kurfürst]

Originally Posted by TomcatViP

Note that the Thumb switch (early HOTAS!) was present only in the E4 and beyond.

Actually it was present before. The December 1939 manual of the 109E already notes it (and the auto pitch), but the E-4 did not come until around May 1940!

[JtD]

It appears that after only 140 posts this debate has finally come to a conclusion - change pitch to increase rpm - adjust pitch to maintain it for a minute - change pitch to decrease rpm - adjust pitch to maintain it for a minute - ... - can be very easily summarised as permanently changing pitch and rpm.

[Robo.]

Kurfurst I believe Tomcat was referring to the Daumenschalter am Gashebel (thumbswitch on the throttle) feature, not to the Automatik per se. But you're right of course, plus I might be wrong and Daumenschalter am Gashebel was also an ealier design.

Originally Posted by JtD

It appears that after only 140 posts this debate has finally come to a conclusion - change pitch to increase rpm - adjust pitch to maintain it for a minute - change pitch to decrease rpm - adjust pitch to maintain it for a minute - ... - can be very easily summarised as permanently changing pitch and rpm.

Indeed!