Correct usage of MBG Emergency Mode?

[Ultra]

I guess I don't really understand what the MBG Emergency Mode does. The manual didn't explain it very much.

What does it do in normal, automatic mode? What is the proper use in manual mode? What is the difference in use between this and MW-50?

Edited November 18, 2014 by Ultra

[Flying-Kane]

Hi Ultra,

 

nice question.

 

Maybe the devs could bring some light into the darkness? :helpsmilie:

 

I will try to answer, from what i know...

 

automatic mode=default mode: you can use the whole power setting of the engine. max. limit: 1,8ata/3250rpm + MW50

 

manual mode: for emergency situations, engine runs strange etc...

max. limit: 1,55ata and 2700rpm (MW50 can't be used, because of the limitations.) - maybe it's something like a "save mode" for the engine?

 

In the evening, i will take a look into the Jumo 213 manual.

[Spectrum Legacy]

If I understand it correctly, it gives you some manual control over your engine, cutting out hydraulic operated engine control unit, thus overriding the automation. I reckon it was used when the MBG unit got damaged and malfunctioned. In that case the handle is pulled which should recover or provide more direct control (manual system is some kind of backup in this case - i.e. the emergency system), which should help you more to save the plane and RTB.

 

I don't really know whether it provides at some point more performance over the automatic default mode, though at lower and up to 2/3 throttle settings, the engine runs on noticeably higher ata (maybe it is just less efficient). That comes with faster heat build-up and naturally higher powerplant stress.

[Ultra]

Thanks for the answers guys.

 

Looking at the manual again, it seems to me that the main purpose is to allow the engine to run at higher boost pressures with a lower throttle setting.

 

I guess the real question is what type of emergency would cause you to have to do that? It seems weird to have a situation where it'd be necessary to run the engine at higher pressures for, seemingly, the same RPM. :huh:

 

In general, think the manual needs a little more work. I read through it and I feel like I still don't know what all the controls are for. For example, I don't remember reading anything about the "MW-50 to Fuel Handle of water-methanol tank" shown in the left side legend.

(I've been using the manual from the forum (updated 9-5-14) maybe the game folder version has been improved since then...)

Edited November 18, 2014 by Ultra

[TwilightZone]

ng, maintained by the hydraulically operated governor. Power Settings Emergency Power (increased take-off power) 3,250 RPM only below 1,000m on 213A-G1 by pulling the MBG-emergency pull or as intermediary solution on 213-A RS by operation of a cock in the manifold pressure line. Hereby the manifold pressure increases by 0.2 ata while maintaining constant engine speed/RPM. At the latest 3 min after takeoff, reduce to combat power and slightly push flight stick forward. Throttle position can be fixed by turning the handgrip on lower left. Throttle Position / Power Output / RPM / Permissible Time / Fuel Consumption Liter/hour:          90° command angle / Emergency Power (increased take-off power)* / 3250 / 3min / 620 -20 90° / Take-Off, Combat and Climb Power / 3250 / 30min / 590 +20/-40 75° / Continuous Power / 3000 / constant / 530 60° / Economy I / 2700 / constant / 375 47° / Economy II / 2400 / constant / 285 34° / Economy III / 2100 / constant / 215 0° / Idle (in flight) / app. 1200 / - / - 10° / Engine Stop position / - / - / -

not sure if this helps....found in power settings page 94 of manual

Edited November 18, 2014 by TwilightZone

[TwilightZone]

.....i hope Yo-Yo or someone who knows will chime in at some point here......i still don't fully understand this MGB feature myself.....:-)

[Flying-Kane]

Thanks for the answers guys.

 

For example, I don't remember reading anything about the "MW-50 to Fuel Handle of water-methanol tank" shown in the left side legend.

 

The tank behind the pilot (auxiliary tank) could be filled either with B4 fuel or with MW50.

 

With the handle, you control where the "stuff" was injected. MW50 into the blower of the engine or B4 direct into the engine, something like that.

 

But it's not modeled in the sim. We have only MW50.

[Ultra]

But it's not modeled in the sim. We have only MW50.

That was my first guess. They forgot the "not implemented".

 

Regarding emergency use of manual MBG mode I found this in the manual (pg. 99):

 

Flight Emergencies:

Power Plant Failure

-In case of a failure of engine regulator automatics, retard throttle towards idle as much as possible and pull emergency pull to the right of the fuel shutoff valve. Keep engine power to as to as little as possible in order to avoid engine stresses.

-When emergency pull is pulled, engine speeds higher than 2700RPM are prohibited.

-In case of falling oil pressure indication, landing has to carried out immediately, if possible.

-In case fuel vapors enter the cockpit, switch off fuel tank pumps, don oxygen mask and slightly open the canopy. Report leakage after landing.

-In case of a failed fuel pump, flight may continue to the next airfield at low RPM, using both fuel tank pumps.

 

It was just really vague.

"fuel shutoff valve" = Fuel Tank Selector Lever

"emergency pull to the right" = MBG Emergency Mode Handle :)

 

I still don't know if there are other uses or why it is used for emergency take-off power though...

Edited November 18, 2014 by Ultra

[Flying-Kane]

I still don't know if there are other uses or why it is used for emergency take-off power though...

 

Emergency take-off power only means 3250rpm and MW50. This is the maximal power setting of the engine, it has nothing to do with the emergency handle of the MBG.

[Ultra]

Emergency take-off power only means 3250rpm and MW50. This is the maximal power setting of the engine, it has nothing to do with the emergency handle of the MBG.

 

 

What about this from what TwighlightZone said from the manual:

Power Settings Emergency Power (increased take-off power) 3,250 RPM only below 1,000m on 213A-G1 by pulling the MBG-emergency pull or as intermediary solution on 213-A RS by operation of a cock in the manifold pressure line. Hereby the manifold pressure increases by 0.2 ata while maintaining constant engine speed/RPM.

[Flying-Kane]

Don't know, which source is that from?

 

Never heard of that before...

 

Like i said in my previous posts, use only automatic mode and you are fine.

 

In the updated game manual, there are new descriptions about the MBG emergency lever:

 

"MBG-Emergency lever switches MBG to manual operation by cutting off pressurised oil. In the case of MBG malfunction it allows to proceed flight using manual throttle valve. Normally this throttle fully opens at 40 degrees of the throttle giving a room for further automatic control. In the manual mode its range is extended up to 90 degree or full throttle lever range. Due to engine overstressing throttle must not be advanced beyond 2700 rpm or 60 degrees of its travel."

[TwilightZone]

@Flying-Kane......ok i see what happened here....the game manual i got that from was the original one.......i've had the pdf on my phone from way back didn't realize it was a older manual......just checked the current in game manual which is indeed different......sorry didn't mean to confuse anyone here.....:-)

[Flying-Kane]

Ok got it. :)

[Ultra]

I guess I need to check out the updated in-game manual. They should update one on the forum too.