M-W 50 Function

[SharpeXB]

It’s still not quite clear how this works (in the G-14)

The tank starts with no pressure. Shouldn’t it have pressure? And be reduced through use?

Isn't the system engaged by a switch and not just moving the throttle forward?

I can’t quite follow the description in the game, it sounds like you have to run on Combat power for 10 minutes to pressurize it.

[Barnacles]

18 minutes ago, SharpeXB said:

It’s still not quite clear how this works (in the G-14)

The tank starts with no pressure. Shouldn’t it have pressure? And be reduced through use?

Isn't the system engaged by a switch and not just moving the throttle forward?

I can’t quite follow the description in the game, it sounds like you have to run on Combat power for 10 minutes to pressurize it.

On the 109G14 and K4 it is operated by moving the throttle forward to the stop. There's a switch in the throttle assembly which activates the MW50 system. This will then pressurise the system. The pressure will drop with altitude and as you climb you'll get to a point where the pressure drops so you will not be able to run the system.

There is sufficient MW50 carried for 30mins of use, in bursts of NMT 10 minutes.

 

[Raven109]

MW-50 in-game is engaged (i.e. MW-50 being poured into the throttle intake) by moving the throttle to the max power setting.

 

You can use this max power setting for 10 minutes. After that you'll damage your engine.

 

The pressure in the system rises only when you are using MW50 (i.e. pushing the throttle to max, or close to that max position).

 

If MW-50 is not engaged, i.e the pressure is below 0.4, yet you are still running a power setting above or equal to 1.42ATA/2800RPM (the max power settings for a DB605A engine), your engine will last for just 1 minute (just like it does in the 109G-6 at max power settings).

 

IIRC, there were 2 methods of pressurizing the MW-50 system. One was by using pressurized bottles, behind the cockpit, which helped get the MW-50 mixture to the engine. This system was used in the G-6 "Late" models. The other system was based on a pressure feed line from the compressor, used in the later 109 models.

 

 

Edited May 8, 2020 by Raven109

[SharpeXB]

Isn’t the system on the real aircraft (or the DCS Dora and K-4) activated by a switch and not just moving the power lever?

Edited May 8, 2020 by SharpeXB

[Raven109]

On the real 109 there was a toggle switch to activate the system, or deactivate it when not needed (i.e. above full throttle height, where MW injection is not helping anymore).

 

I believe in-game this switch is always on.

 

Still, the method by which MW-50 was injected into the compressor was by pushing the throttle forward (when the MW-50 system toggle was on, of course)

Edited May 8, 2020 by Raven109

[Barnacles]

3 minutes ago, Raven109 said:

On the real 109 there was a toggle switch to activate the system, or deactivate it when not needed (i.e. above full throttle height, where MW injection is not helping anymore).

 

I believe in-game this switch is always on.

 

Still, the method by which MW-50 was injected into the compressor was by pushing the throttle forward (when the MW-50 system toggle was on, of course)

In the 109s it's always on, in the 190D9 you can turn it on and off with the engine boost button

[SharpeXB]

3 hours ago, Raven109 said:

The other system was based on a pressure feed line from the compressor, used in the later 109 models.

So is this why you need to run the engine at combat power for 10 minutes to repressurize it?

 

I see what’s happening, the Technochat is saying “Low Pressure” as soon as you start it up because it’s taking time to build up. 

[Raven109]

Do you mean the 10 min limit mentioned in the in-game specs? If so, then that is the limit you can run the 109 engine at max power before it gives up on you, when using MW-50. So, you can go for 10 minutes at full power with MW-50, then 10 minutes at combat power, as a cool down, then 10 minutes full power again - this is according to the in-game spec. I've never run it 10 on - 10 off - 10 on to see if it works as the spec says.

 

I'm not using the technochat, so I can't say anything about the Low pressure warning. I'm getting full pressure in the MW-50 system right after starting the engine and pushing the throttle to it's max position, so I don't think that warning is related.

4 hours ago, 71st_AH_Barnacles said:

In the 109s it's always on, in the 190D9 you can turn it on and off with the engine boost button

 

Ok, good to know, I got the D9 a few weeks ago but only went for a short QMB flight.

Edited May 8, 2020 by Raven109

[=420=Syphen]

51 minutes ago, SharpeXB said:

So is this why you need to run the engine at combat power for 10 minutes to repressurize it?

 

I see what’s happening, the Technochat is saying “Low Pressure” as soon as you start it up because it’s taking time to build up. 

 

Watch the gauge in the top left of the panel of the K4 - It's your MW50 pressure and you can get an idea of what it's doing. (The G-14 doesn't have a pressure gauge).  The G-14 and K-4 both used pressure from the supercharger to charge the system, while G-6's with retrofitted MW50 used pre-charged pressure bottles. 

 

You can see the K4's pressure gauge circled here:

 

 

Once you go over 1.7 ATA, the system will start to charge and begin injecting.  If you slam the throttle open, it doesn't have time to pressurize and you'll get a low pressure techno-chat warning until it builds up. 

[Raven109]

The G14 has a pressure gauge, it's on the left side wall.

[SharpeXB]

5 minutes ago, [CPT]HawkeyeP said:

Watch the gauge in the top left of the panel of the K4 - It's your MW50 pressure and you can get an idea of what it's doing. (The G-14 doesn't have a pressure gauge). 

Actually the G-14s is over on the left side, next to the tail wheel lock. 

[=420=Syphen]

There ya go. I've been too busy flying the Tempy on CB to spend much of any time in the G14. 

[BMA_FlyingShark]

8 hours ago, 71st_AH_Barnacles said:

In the 109s it's always on, in the 190D9 you can turn it on and off with the engine boost button

It's beyond me why they don't give us control over the switch in the 109s while we have it in the 190D9.

 

Have a nice day.

 

[Raven109]

1 hour ago, FlyingShark said:

It's beyond me why they don't give us control over the switch in the 109s while we have it in the 190D9.

 

Have a nice day.

 

 

Yes, I'm also confused about this.

 

Also, the ATA gauge in the 109g14 is showing the wrong boost pressure up to full throttle height. This latter one was reported as a bug a few years ago, and again, a few weeks ago.

Edited May 8, 2020 by Raven109