A master switch for the Bf 109's MW 50

[greybeard_52]

Would it be possible, in Bf 109s equipped with MW 50, to insert (as in fact there was) a master switch to enable the superpower device, in addition to the throttle threshold? The current forced activation, when a certain limit is exceeded with the throttle, almost obliges the player to have to manage an excessive power (read: torque) during take-off, which historically was not even allowed by the manuals, which prescribed the use of the MW 50 only in flight . In practice it is the same solution already used in the game for the Fw 190D-9.

[the_emperor]

Historically the 109s with MW50s dont have access to Start&Notleistung (1.42ata) due to different throttle interconnection. If you push past 100% (1.3ata/2800) you immediately  go to 1.7ata and without MW50 that would destroy your engine quickly.

Though the game allows us to fine manipulate the throttle so we have access to the engine ratings in between that is not the historically case.

It is either Steig&Kampfleistung (1.3ata) or erhöhte Notleistung (1.7ata).

You will have to take off with Steig&Kampfleistung (1.3ata)

Using 110% of your throttle without MW50 is only allowed at/above the FTH of your DB605A(S)M (~6600/8300m) so you dont run into the risk of overboosting.

Edited January 25, 2023 by the_emperor

[greybeard_52]

42 minutes ago, the_emperor said:

If you push past 100% (1.3ata/2800) you immediately  go to 1.7ata

It's a pity! I was hoping that the master switch would also limit the pressure to 1.3 ata...?

 

46 minutes ago, the_emperor said:

You will have to take off with Steig&Kampfleistung (1.3ata)

In fact, I remember Captain Brown also mentioning this pressure value, recommending 'not to insist on accelerating during take-off'. However, I find myself struggling, during the frantic take-off phase, not to exceed the 1.3 ata limit.

 

I also wonder what the master switch seen in the pictures below was for... Perhaps to switch off the MW 50 when the tank was empty? However, this did not prevent it from 'jumping' to 1.7 ata if the pilot improvidently exceeded 100% throttle...?

[the_emperor]

5 hours ago, greybeard_52 said:

Perhaps to switch off the MW 50 when the tank was empty? However, this did not prevent it from 'jumping' to 1.7 ata if the pilot improvidently exceeded 100% throttle...

Yes and when above MW50 FTH. But switching that off below FTH is a guaranteed engine kill if you throttle past 100%

So no reason to model that switch in the game. 
at 80% in the techno chat you are at 1.3 ata

Edited January 25, 2023 by the_emperor

[greybeard_52]

Thanks again!?

[Leftenant_Soap]

Why is it not reasonable to have the MW-50 activated by the emergency power button. The Spitfire Mk Vb is a great example of this, the +16 lb boost is gated and only attainable if you hit the emergency power key. So you could throttle to the max and have your DB605 limited to 1.3 ata until you hit that key, then you can throttle up a little more to get full 1.7 ata.

 

I am guessing "FTH" means something similar to critical altitude like you have with turbosuperchargers.

[greybeard_52]

5 hours ago, DD_Soapy said:

then you can throttle up a little more to get full 1.7 ata.

I think hitting the master switch should make the MAP jumping to 1.7, without need to further throttle up, being already 100%.

 

5 hours ago, DD_Soapy said:

I am guessing "FTH" means something similar to critical altitude

It means Full Throttle Height, that is altitude where throttle (meant as carburetor valve) can be fully opened (at lower altitudes generally an aneroid capsule between pilot's lever - throttle command - and carburetor valve limits aperture of this latter).

Edited January 30, 2023 by greybeard_52

[the_emperor]

15 hours ago, DD_Soapy said:

Why is it not reasonable to have the MW-50 activated by the emergency power button.

 

You could model that, but the 109 simply does not have such a button. There is just the throttle and the on/off switch for MW50 injection (not modelled in the game).

 

15 hours ago, DD_Soapy said:

I am guessing "FTH" means something similar to critical altitude like you have with turbosuperchargers.

Yes, full throttle height,  the maximum altitude where the charger is able to provide full boost in level flight (with ram effect)