P47 Turbo Response Time

[ACG_Cass]

Unsure if this is something that was an issue with the real plane and it is modeled correctly, but having flown the D-30 in DCS it doesn't appear to have the same issue. 

 

I understand the P47 has a very large engine & turbo and as such the turbo can take some time to spool up and wind down. But there appears to be an almost 3 second delay from when turbo lever is pushed forward to when it even starts reacting. I understand the air has a long way to go in such a large complex system, but it's travelling incredibly fast and it doesn't seem right that it's taking this long to even react to an input. 

 

 

When you push the lever back and forth very quickly, you appear to get some very odd behavior where this delay seems to kick in despite keeping the lever fairly far forward. It's almost as if once the turbo begins de-spooling, no matter how quickly the lever goes forward or how far, you are automatically forced to wait until the turbo to start increasing again. 

 

Loving the plane at the moment, you guys have done a great job. It's just the manuals state to keep the throttle full forward at high altitude and regulate your manifold pressure with the turbo lever, which is almost impossible to do in game without staring at the gauge for an ages. In DCS (I know it's a completely different philosophy of engine modeling so not comparing that, just the end functionally of the levers) the turbo still takes similar times to spool up, but responds to inputs very quickly. 

 

 

 

 

Edited January 8, 2021 by Cass
grammar

[6./ZG26_Klaus_Mann]

Turbos are weird Feedback Systems, especially combined with Supercharging. And there are a lot of dampening Effects. And I also have some doubts about the Turbos at the Moment.

Even with Wastegate fully open, just the drafting of the Supercharger sucking in Air should accelerate it to a certain Base RPM, I don't believe it should be Stationary.

 

Considering the Lag, tons of Factors playing into that, mostly being Air having Inertia, Backpressure Buildup, Tubine Scavenging, Feedback Loops and the Interaction of Turbo and Supercharger over a Distance of several Meters.

Apparently we don't actually have direct Control over the Turbo.

https://forums.eagle.ru/topic/240278-impeller-supercharger-and-turbocharger-interaction/

[ACG_Cass]

Oh it's a horrendously complex system to model in detail and I'm certainly not expecting that to any degree. My issue is there seems to be a significant baked in delay when the turbo begins to retard that doesn't seem to correspond correctly with the lever (you can see this more clearly in the second video). Making quick manifold pressure changes using it very difficult.

 

One of the other issues is that the turbo doesn't begin to spool until the lever is set way forward making the lever even more difficult to use. At sea level it's 86%, which I can understand seeing as that's not where it is designed for.

 

But up at 10,000 feet, you still need 75% before it starts to spool. From what I've found on the A2A and DCS P47 (only reference points), most of the lever is used even as low as 5,000 feet with the turbo rarely starting from 0 once you're up to speed.

 

Not a massive issue as the way it's modelled you can just put the turbo full forward and keep it spooled. But it would be nice for it to get quick pass at some point so it can be used realistically.