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Engine limits chart


Diesel_Thunder
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While reading through the DCS manual for the Jug, I noticed that there was not an engine limits chart like the Mustang's manual has (pg 32).

 

So I creating one using data from the DCS P-47 manual, real life P-47  25-35 manual (thanks for posting that grafspee), and published data for the R-2800 engine. Like to think this would be a handy reference for my fellow Jug pilots.  :drinks_cheers:

 

Some thing to mention about lean cruise. The real manuals have tables with power settings (MP and RPM), altitude, and aircraft weight for specific range and fuel flow at cruise power (both auto rich and auto lean). Auto lean has substantial fuel savings in gallon per hour as you'll see on the chart. The blue arcs on both the MP and RPM gauges are a quick reference for the pilot for when you can operate in auto lean, with the specific power settings listed on the tables in the manual as mentioned. Both needles have to be within the blue arcs in order to use auto lean.

 

CAUTION - The tachometer in our DCS P-47 has backwards colors for the green and blue arcs. The arcs are the proper span based on published data, but the colors are reversed. Below is a corrected screenshot of the proper color arcs.

*** NOTE: The blue and green tachometer arcs have been corrected. Unsure when it was corrected as it was not documented in any patch notes, but it was fixed at least as of Open Beta 2.7.10.19473. ***

 

WARNING - Do not dogfight in auto lean! If you are in lean cruise, be sure and shift back to auto rich before bringing up the power for aerial combat. You risk overheating the engine and damaging it (very high risk of detonation).

 

Later models during the war had different carbs fitted where there were only three mixture settings (cutoff, auto, emergency rich) like in the DCS Mustang. It was one less thing for a pilot to forget if he got bounced by enemy fighters, and the carb would set the mixture lean or rich as needed based on power settings.

 

P-47 engine limits.png

 

Corrected tachometer arc colors:

RPM guage corrected.png

- 14MAR22 - Noted changed regarding tachometer color arcs.


Edited by Diesel_Thunder
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  • 2 weeks later...
On 1/22/2021 at 1:13 PM, Cool-Hand said:

Awesome, thanks for posting this, i find the dcs manual to be a little lacking at the moment compared to the Mustang.

 

You're welcome! :drinks_cheers:

 

On 1/22/2021 at 12:54 PM, grafspee said:

Factory don't recommend cruising below 2070rpm.

 

I saw that, but it is only a recommendation and not a limitation or restriction. The last few pages in the manual contradict that by giving cruise settings below 2,070.

PC: MSI 990FXA Gaming, FX-8120 3.1 GHz, 32GB Patriot Viper RAM, GTX980 4GB, 27" 1080p curved Samsung monitor, TM Warthog HOTAS, Saitek Pro Flight pedals, Opentrack

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9 hours ago, grafspee said:

I didn't say that this is limitation.

 

No worries. 🙂 I know you and I are aware of that distinction in aircraft manuals, it was more for the benefit of others that don't know that.


Edited by Diesel_Thunder
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PC: MSI 990FXA Gaming, FX-8120 3.1 GHz, 32GB Patriot Viper RAM, GTX980 4GB, 27" 1080p curved Samsung monitor, TM Warthog HOTAS, Saitek Pro Flight pedals, Opentrack

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