Quick question about P-47 engine management

[I./JG52_Woutwocampe]

I interconnect throttle and turbo but manage the revs apart.

 

However, increasing or decreasing throttle/turbo also alter the revs accordingly, not just a slight temporary fluctuation that you can observe when you decrease throttle dramatically in a very short span for instance.

 

If I decrease throttle/turbo, it will decrease rpm's like it was actually interconnected but it isnt.

 

Has it something to do with a switch to go from constant speed prop to fixed pitch or something? Or a bug? I doubt its a bug...

Edited June 15, 2022 by I./JG52_Woutwocampe

[oFlyingDutchman]

the turbo requires longer to get back to pace
interconnect the throttle and turbo, go to 100%, and disconect.
Leave the turbo at 100%, you wont need to change that util you get very high (if the red light stops blinking on your left corner of your cockpit, you should decrease the turbo util it stops blinking) 
 

Leaving the turbo at 100%, you should see less drastics drops on your rpm

 

[I./JG52_Woutwocampe]

3 hours ago, oFlyingDutchman said:

the turbo requires longer to get back to pace
interconnect the throttle and turbo, go to 100%, and disconect.
Leave the turbo at 100%, you wont need to change that util you get very high (if the red light stops blinking on your left corner of your cockpit, you should decrease the turbo util it stops blinking) 
 

Leaving the turbo at 100%, you should see less drastics drops on your rpm

 

 

Is it safe to let the turbo at max speed non stop? Most of the tutorials and how-to vids I've seen suggest the turbo and throttle should be kept interconnected unless you are above critical altitude. 

 

Wont the turbo overheat if pushed to the max non stop? I assume I must let the inlet cowls fully opened then, which means a small performance loss?

 

 

[Skycat1969]

Tested using P-47D-28 ...

 

First, check that you have both the engine assist and radiator assist options turned off. In my experiment I noticed that a player can link the turbo and throttle and still be in automatic mode for the other controls.

 

Next, try keeping your manifold pressure at 42" HG (ie, at the maximum on the green mark) or more. Setting it lower causes the RPM needle to drop below what you set the RPM lever for, even at low altitudes where turbo *shouldn't* be necessary to make desired power.

 

My guess is that the flight model is programmed around the historic flight manual's Maximum Continuous settings ("for emergency high speed cruising only") which it uses instead for economy cruise settings. Historically, 52" HG @ 2700 RPM is Military Power limited to 15 minutes, but in the game it is practically the default cruise setting so I'd consider it the game's de facto Maximum Continuous setting. Run the turbo at 100%; but remember to keep your Carburetor Air Temperature in the green by using your intercooler doors. (Cowl flaps are for controlling Cylinder Head Temperature.) Reducing manifold pressure to 38" HG and less seems to automatically engage a corresponding economy cruise RPM setting from the historic Flight Operation Instruction Chart.

 

I love flying the P-47 in fully manual settings but I think both the flight model and damage model need to be reexamined.

Edited June 16, 2022 by Skycat1969

[Weegie]

That's really interesting that the turbo can just be set at 100% & left there, what's the point of being able to adjust it?

 

I realize many will have seen it, but Greg gives you the run down on how it should be in the real thing

 

 

[Skycat1969]

To be fair I meant at 100% when below critical altitude. The single player action usually happens below 10,000 feet so in practice turbo overspeed isn't much of a concern as far as gameplay goes. I also haven't seen a penalty for turbo mismanagement. I think the game engine isn't coded to handle so many variables presented by the P-47's several interacting systems so the turbo is simplified for game purposes.

[354thFG_Rails]

12 hours ago, I./JG52_Woutwocampe said:

 

Is it safe to let the turbo at max speed non stop? Most of the tutorials and how-to vids I've seen suggest the turbo and throttle should be kept interconnected unless you are above critical altitude. 

 

Wont the turbo overheat if pushed to the max non stop? I assume I must let the inlet cowls fully opened then, which means a small performance loss?

 

 

the game has not modeled the turbo to engine relationship well. you can leave it 100% all day, no damage will occur, you can even let it overspeed past its limit no problems. just keep an eye on your CHT. it gets hot faster. best practice is to just interconnect and forget about it.

[oFlyingDutchman]

16 hours ago, I./JG52_Woutwocampe said:

 

Is it safe to let the turbo at max speed non stop? Most of the tutorials and how-to vids I've seen suggest the turbo and throttle should be kept interconnected unless you are above critical altitude. 

 

Wont the turbo overheat if pushed to the max non stop? I assume I must let the inlet cowls fully opened then, which means a small performance loss?

 

 

yup, quite safe
Like i said, you can bring it back down from 100% when the turbo light on your cockpít stops blinking
Otherwise, leave it at 100%, you are are good

If your engine is at continuos, it wont overheat, when you go into combat, it will slowly increase the heat, so remember to use the boost so it wont overheat that quickly

If you play your cards right, you wont be using combat that often. Good to climb with it tho

I, sadly, dont remember what which engine is flap is called but i think you will still understand
About them: only open the ones in front of you when necessery, if your engine is not overheating, keep'em close

The one below your bird, remember to fully close it when diving so your plane wont shake
as a rule of thumb, during winter ~30%; auttumn/spring ~50%; summer ~70%

Adjust em as necessary. The gauges in the cockpit are easy to read so it wont be a problem after you fly it for a bit 

[Voyager]

21 hours ago, I./JG52_Woutwocampe said:

I interconnect throttle and turbo but manage the revs apart.

 

However, increasing or decreasing throttle/turbo also alter the revs accordingly, not just a slight temporary fluctuation that you can observe when you decrease throttle dramatically in a very short span for instance.

 

If I decrease throttle/turbo, it will decrease rpm's like it was actually interconnected but it isnt.

 

Has it something to do with a switch to go from constant speed prop to fixed pitch or something? Or a bug? I doubt its a bug...

I'll have to check, but I recall the P-47 throttle has a catch on it that, if you try to push the throttle past the pitch lever, it catches the pitch lever and hooks it along. 

 

As I recall, it was added so that if pilots grabbed the throttle and shoved at low RPM, it would keep them from blowing the engine. 

 

It's been a while since I've flown the WWII era stuff, but I remember being pretty surprised the first time that happened. 

 

As for the turbo controls, it breaks when oversped, but that only really happens at high altitude. The reasons you don't want the turbo forward in the real plane is it increases back pressure on the exhaust, which robs the engine of power, and the supercharger throttle loses efficiency when it's running at anything less than full open. However, I don't believe that power loss is currently modeled in the game. 

 

Basically you should see a significant power loss if you're running 100% turbo and controlling power with the throttle, but currently, I don't think we do. 

 

Actually, you can test that by setting up at a specific altitude and using different combinations of turbo and throttle to hit 42". If the power loss is modeled, then you should see the fastest speed from just throttle, and the slowest speed fromostly turbo boost. But, I think we'll probably see any combo that gives 42" have the same speed. 

 

Best use is to keep the turbo closed until you're at throttle wide open, and then add turbo to reach desired boost. But, that's hard to do in practice because the turbo lag is very real and its easy to over/undershoot. So for most pilots it was more effective to lock the turbo and throttle together. Not as efficient and costs power in the real plane, but more responsive. 

[I./JG52_Woutwocampe]

Thanks for the answers gentlemen

[RossMarBow]

Leave turbo at 100% 
Only need  to lower it if its over-speeding at very high alts