Aux Hydraulic Hand-Pump Not Building Pressure

[Sport]

Was doing the startup training mission, and I cannot build hydraulic pressure by using the hand pump to actuate the cowl flaps.  The needle jumps up to 1000psi then back to zero. Track attached, and I can also record a video if needed.

https://drive.google.com/file/d/1f9kz48Z4oZmrrKpBDQ8g3QH0HSnxeUcK/view?usp=sharing

[saburo_cz]

You must set the flap handle to NEUTRAL position, without it all pressure produced by the emergency pump will move with flaps and will not pressurize hydraulic accumulator. 

 

Unfortunately even though you set the flap handle in to neutral position, it will behave weird and not correctly, you will see.

[AJaromir]

Yes, the hydraulic pressure in DCS:P-47 works like "On/Off" and not like "0-100%". The pressure is built instantly and not gradually (accumulated) It looks like the hydraulic system capacity (volume) is not simulated. I am not sure if that's the gauge bug or the whole hydraulic pressure system is modelled wrong.

Edited November 22, 2022 by AJaromir

[AJaromir]

From my feelings the hydraulic accumulator in P-47 works more like ideal hard source. By that I mean it provides full pressure until it is fully discharged. This can be likened to an ideal hard electric power supply that provides full voltage until the source is completely discharged. But this is not the case of real hydraulic accumulator. In reality it is like the soft source. That means the pressure drops according to its "charge" because IRL the pressure equals the charge. And the manual hydraulic pump or the engine driven hydraulic pump is the charger of hydraulic accumulator.

Edited November 22, 2022 by AJaromir

[Sport]

On 11/21/2022 at 11:37 AM, saburo_cz said:

You must set the flap handle to NEUTRAL position, without it all pressure produced by the emergency pump will move with flaps and will not pressurize hydraulic accumulator. 

 

Unfortunately even though you set the flap handle in to neutral position, it will behave weird and not correctly, you will see.

That makes sense. Wasn’t in the checklist, but yes. However, you should be able to pump the flaps up in that case, and also charge the accumulator. Either way, the system isn’t working as it should be

[Magic Zach]

I was wondering about this today actually.  This checks out, because in the startup tutorial mission, the guy had me keep my flaps lever forwards for whatever reason, and then try to pump the hydraulics, expecting there to be a rise in pressure.  Woops, sounds like the startup tutorial mission needs to be adjusted.

[AJaromir]

2 hours ago, Magic Zach said:

I was wondering about this today actually.  This checks out, because in the startup tutorial mission, the guy had me keep my flaps lever forwards for whatever reason, and then try to pump the hydraulics, expecting there to be a rise in pressure.  Woops, sounds like the startup tutorial mission needs to be adjusted.

Pressure will rise up once the flaps will be in its final position. But when pulling you will see the flaps will go up or down. Also I've found you can keep holding the manual hydraulic pump lever and it will work. I don't know if it is feature or bug, but it is much less annoying than waiting until the handle will go up and then down. IRL you could move the pump lever faster. So probably it is feature.

Edited November 26, 2022 by AJaromir

[Aernov]

Aux hydraulic hand pump can be operated faster (it requires force to operate, but, AFAIK, pumping is happening on handle pull, it should return to the low position without significant resistance, i.e. easier/faster than it would go up), as well as engine primer is operated slower since it also is a hand operated pump (as seen in wartime training videos). Holding hyd. pump handle in upper position should have the same effect as with any hand pump - none. Instead of making this kind of workaround feature, why not adjust pump handle operating speed?