DCS Spitfire Engine Setting Quick Reference Guide

[DD_Fenrir]

Hi chaps and chapesses,

 

Been working on a QRG for my squad for engine settings and the various fuel consumptions at these Boost and RPM combinations.

 

The caveats:

 

1. All airspeed figures were measured by me in game using a clean Spitfire LF Mk.IXc (no external stores), the cockpit ASI at altitudes as read from the in cockpit altimeter in the Normandy Free Flight mission. As such there will be some variance given different ambient air pressures and aircraft loadings. Hence the tilde prefix acknowledging the approximate nature of these figures.

 

2. All fuel consumption figures are either taken directly from those given in the A.P 15651, P&L-P.N. Pilot’s Notes for Spitfire IX, XI & XVI (September 1946) or where there are none specific to a given Manifold/Pressure and RPM combination, are extrapolated from them. There was a bit of maths comparing rate of change per 100RPM or per 2lb boost change, but ultimately some are reasonable estimates.

As such they are guidance only and actual performance will vary. Actual DCS fuel consumption figures are currently unavailable but are planned to be investigated for future reference.

 

3. Green highlighted show my personal preferences, one for what I term a Combat Cruise, settings which I find seems to get a balance between airspeed and fuel consumption, good for when over enemy lines but not immediately engaged. The other I have not titled but would suggest be an egress cruise; settings to get home relatively quickly but at increased MPG.

These are not official and there is nothing covering this in official publications for the Mk.IX - it seems that the Air Ministry left it to pilot discretion to determine; indeed this why I have included the calculations for both estimated endurance at a given setting and a gallon per minute figure so you if you're finding yourself at something of a premium for fuel, you can do your own mental gymnastics to work out what setting is most likely to (maybe) get you home (or at least near it!)

 

Hope it is of use. Feedback welcome.

 

Fen

DCS Spitfire LF.IX Engine Setting & Fuel Consumption Quick Reference Guide.pdf

Edited December 13, 2020 by DD_Fenrir

[Sn8ke_iis]

Well Done!

 

Nice! I'm definitely throwing that on the kneeboard/tablet. Good for when I'm in the mood for old school stopwatch navigation.

[JokerMan]

Thanks for sharing.

As a ready reference, this will prove valuable in a pinch then getting your kite back to base is a priority.

 

S!

[Skidjit]

Awesome work! Really appreciate this!

[Ala13_ManOWar]

Really nice finding. Thanks for sharing!!

 

 

 

 

S!

[Strut]

Good job Fenrir and thanks !

[bart]

Great job, and many thanks for sharing it. :thumbup:

[Snapage]

Nice work! Appreciate you sharing, thanks.

[River]

I can't see any charts in your post Fenrir, maybe because of the new forum engine? 

On 9/6/2018 at 1:36 AM, DD_Fenrir said:

Hi chaps and chapesses,

 

Been working on a QRG for my squad for engine settings and the various fuel consumptions at these Boost and RPM combinations.

 

The caveats:

 

1. All airspeed figures were measured by me in game using a clean Spitfire LF Mk.IXc (no external stores), the cockpit ASI at altitudes as read from the in cockpit altimeter in the Normandy Free Flight mission. As such there will be some variance given different ambient air pressures and aircraft loadings. Hence the tilde prefix acknowledging the approximate nature of these figures.

 

2. All fuel consumption figures are either taken directly from those given in the A.P 15651, P&L-P.N. Pilot’s Notes for Spitfire IX, XI & XVI (September 1946) or where there are none specific to a given Manifold/Pressure and RPM combination, are extrapolated from them. There was a bit of maths comparing rate of change per 100RPM or per 2lb boost change, but ultimately some are reasonable estimates.

As such they are guidance only and actual performance will vary. Actual DCS fuel consumption figures are currently unavailable but are planned to be investigated for future reference.

 

3. Green highlighted show my personal preferences, one for what I term a Combat Cruise, settings which I find seems to get a balance between airspeed and fuel consumption, good for when over enemy lines but not immediately engaged. The other I have not titled but would suggest be an egress cruise; settings to get home relatively quickly but at increased MPG.

These are not official and there is nothing covering this in official publications for the Mk.IX - it seems that the Air Ministry left it to pilot discretion to determine; indeed this why I have included the calculations for both estimated endurance at a given setting and a gallon per minute figure so you if you're finding yourself at something of a premium for fuel, you can do your own mental gymnastics to work out what setting is most likely to (maybe) get you home (or at least near it!)

 

Hope it is of use. Feedback welcome.

 

Fen

 

 

[Art-J]

If Fenrir is not around at the moment, I'll post it below:

 

 

DCS Spitfire LF.IX Engine Setting & Fuel Consumption Quick Reference Guide.pdf

[DD_Fenrir]

Okay chaps, guide is reattached to the Original Post. Thanks to River for pointing out it's absence and to Art-J for reposting in the interim; much obliged gents.