Inaccurate performance data for BOB fighters in COD comparing to RL data

[*Buzzsaw*]

Originally Posted by Kurfürst

Frankly this was discussed a zillion times, but despite years of research, there's still no positive evidence that 'all operational fighters' were running on 100 octane. It simply appears to be wishful thinking from a few fanatic fans of the aircraft. WWII aircraft performance.com does list a large number of papers, unfortunately none of them state that all fighters are to or currently using 100 octane fuel. There's no doubt that a signficant number of Spitfires and Hurricanes were running on this fuel, this has been known since the 1960s, so nothing new here, but as to how many, or what percentage, nobody so far can tell for a fact.

The issue is further clouded by the fact that fighter stations (around 50 or so were used during the Battle), and not fighter units were supplied physically with fuel drums.. and the fighter units tended to change their bases every now and then, to be replaced by an another unit. If say, Squadron A, flying from Station X (which had 100 octane present), transferred to Station Z (which did not have 100 octane present but regular 87 octane) and its place was taken by Squadron B in mid-August which until then was flying from Station Z, then you would have Combat Reports from both Squadron A and B using 100 octane, but the reality was that one of them used it in the first half of the month, and the other during the second half of the month..

The closest evidence is a 18th May meeting record, which is still far off from that, as it states farily clearly that the changeover effected select units.

The paper - Co-ordination of Oil Policy Committee, 7th meeting memo - says (direct quote):

"... satisfaction was expressed at the fact that the Units concerned had now been stocked with the necessary 100 octane fuel"

There's a reason why the articles you refer to tend to be dismissed - there seem to be always a case of subtle manipulation of the original papers. Take example the reference to this same meeting mentioned above at the wwiiaircraftperformance.org site, which interprets it as the following:

The Co-ordination of Oil Policy Committee noted in the conclusions of their 18 May 1940 meeting with regard to the "Supply of 100 Octane fuel to Blenheim and Fighter Squadrons" that Spitfire and Hurricane units "had now been stocked with the necessary 100 octane fuel".

Note how this reference to "the Units concerned" suddenly becomes "Spitfire and Hurricane units" in the text of the article; the original suggest that an unknown number (perhaps few, perhaps many), but definietely not all (otherwise why the distinction, if ALL units would be concerned?)

Unfortunately, the wwiiaircraftperformance.org article suddenly goes silent after what has happened after 18 May 1940. That's is unfortunate, because I saw the authors of said article discussing the same subject with an Australian researcher, who has informed them of the following at butch2k's board:

This has all been dealt with on another board in great detail with published authors weighing in with their facts, and you Kurfurst were banned on those boards for putting forward false information and refusing to back up your claims with actual documents and data.

You have no credibility in any kind of educated community, your opinions on this issue have been discredited completely.

All the original documents and accounts clearly point to the fact the RAF Fighter force during the Battle of Britain were converted to use of 100 octane fuel in all Fighter Stations in Groups 10, 11 and 12.

Your attempts to claim 100 Octane was not available was competely proven false in the two threads on the WWII aircraft forums.

The main poster in the threads who deals with every point at the beginning of the two threads, 'Glider' is the nickname of Gavin Bailey, a published author, who has written in detail on the subject, an article of his was published in the THE ENGLISH HISTORICAL REVIEW, a well respected journal which only accepts papers and articles from those with impeccable credentials. Article is here:

http://ehr.oxfordjournals.org/conten...1/394.abstract

Mike Williams, who manages the WWII Aircraft site, was also a participant in the thread.

Here are the links to the two threads, if members of this board take the time to read through them the conclusion is obvious.

#1

http://www.ww2aircraft.net/forum/tec...bob-16305.html

#2

http://www.ww2aircraft.net/forum/avi...2-a-20108.html


Why you Kurfurst, continue to put forward your clearly false claims is a mystery to those who have studied this issue in depth.

[Moggy]

I also know that there were at least 2 Hurricane squadrons based in France during the Battle of France which were using 100 octane fuel.
Taken from another post I made here;

"The 1st combat reports of a 12 lb boost being used in France are from 18th May 1940 with F/Lt I. R. Gleed of 87 Squadron (based in Lille) and S/L E. M. Donaldson and P/O John Bushell both of 151 Squadron (based in Vitry).
http://www.wwiiaircraftperformance.o...ed-18may40.jpg
http://www.wwiiaircraftperformance.o...e/bushell.html
http://www.wwiiaircraftperformance.o...dn-18may40.pdf "

[madrebel]

which again supports the theory that not all squadrons were operational with 100 octane until late or after the BoB.

[TheGrunch]

Originally Posted by madrebel

which again supports the theory that not all squadrons were operational with 100 octane until late or after the BoB.

That doesn't really matter when we're considering a BoB sim, though, does it? Who cares what 13 group were doing when our map doesn't even cover the area anyway? The fuel was being used by someone, and if it wasn't 10, 11 and 12 group fighters out of these consumption figures for the whole RAF, who was it? Remember the fuel was doled out by station, not by squadron. July - August we see that 27% of ALL RAF fuel consumed is 100 octane, and I can't imagine that was going to Bomber Command or Coastal Command.

Consumption InformationThe following information are the consumption details of fuel during the BOB period. This information has come from the War Cabinet Oil Position Monthly report that is available from the National Archives.

Consumption of Aviation Spirit
The following figures are for the whole of the RAF and are the Average Monthly Consumption

September – November 1939 16,000 tons
Dec 1939 – February 1940 14,000 tons
March 1940 – May 1940 23,000 tons
June 1940 – August 1940 10,000 tons (100 Oct) 26,000 tons (87 Oct)
Sept 1940 – November 1940 15,000 tons (100 Oct) 18,000 tons (87 Oct)

[madrebel]

Originally Posted by TheGrunch

July - August we see that 27% of ALL RAF fuel consumed is 100 octane, and I can't imagine that was going to Bomber Command or Coastal Command.

so you're suggesting we just blanket apply 9lbs boost to all spits and hurricanes because 1/4 of the fuel used by the entire RaF was 100 octane?

all i'm saying is if there is 100 octane gifted to the brits i want C3 fuel in my E3(4/7)/N as i can dig up as much evidence that it was in fact used by some JGs as anyone has shown me for the RaF.

[TheGrunch]

A quarter of all RAF fuel consumption and the capability of every fighter to use this fuel adds up to a lot of fighter sorties. I'm not suggesting it be a blanket application, but it certainly ought to be an option.

By comparison the number of /N model 109s was positively measly. 20 E-4/Ns, am I right?

What's the comparison you are trying to make here? 10,000 tons of fuel is a lot however you look at it.

How many E-7/Ns saw service during the battle?

Anyway, go and make another thread if you feel C3 fuel should be modelled, this thread wasn't about Red vs. Blue. I do question why you consider 27% of all RAF fuel consumption to be insignificant, though. Perhaps you think that Bomber Command and Coastal Command used 100 octane? Or stopped operations entirely during the Battle (they didn't)? That's the only way that 27% of all RAF fuel consumption being 100 octane could not be interpreted as a significant proportion of Fighter Command using the fuel.

[madrebel]

i'm saying 1/4 use doesn't justify making all spits and hurris run at 9lbs of boost especially with no specifics. how much of that high grade fuel was used by PR spitfires? how much if any was used by bomber command? how much was used in hurricanes? how much in spits?

i dont have a number for 601N equipped 109s. i know is they first started showing up in late september in Es iirc with a handful of F1s showing up in october/november. all the Fs had 601ns.

the argument is just as valid as the raf argument. the significant majority of raf flights used 87 octane same as the germans. if you're going to give a minority fit for the raf give it to the germans too.

[JG14_Jagr]

Originally Posted by TheGrunch

A quarter of all RAF fuel consumption and the capability of every fighter to use this fuel adds up to a lot of fighter sorties. I'm not suggesting it be a blanket application, but it certainly ought to be an option.

For now, model the basics, the most common lunch pail aircraft that were the yeoman.. we can model the 15th variation that had 4 produced and saw service for 3 hours before the battle officially ended later..

Everyone always starts screaming because they want the highest performing variant and every advantage.. The game is 72 hours old and there are many more issues to deal with before this becomes the priority.. at this point we don't even have accurate means to analyse the data and speeds.. going by Altimeters and Speedometers that are nothing more than a graphical portion of a GUI isn't wise..

[DC338]

Lets look at consumption: 10,000 tons of 100 octane spirit used per month in june and august.

10,000 tons = 10,160,000 Kilograms of Spirit due imperial tons.

Hawker Hurricane fuel Capacity 441 L = Approx 320 kg of fuel (SG of 0.72) I used the hurri becasue it carries 60L more than Spitfire.

So 10,000 tons of would provide 31750 full tanks of fuel for a hurricane. That would account for 1040 full tanks per day for hurricane for the 61 days of june and august. Make your own mind up if it is enough. I think it is enough to provide all front line fighter squadrons involved with 100 octane.

[Moggy]

If you look at the stockpile amount of 100 octane fuel, it actually goes up between March 1940 and October 1940! That could only mean either Britain wasn't using the fuel and was saving it. Or there was plenty to go around.
Personally I believe there was more than enough to go round and let's face it Britain was fighting for her existence and wouldn't hold anything back.
Oh yes and not forgetting the order for squadrons to make the necessary alterations to their Merlins so their Hurricanes and Spitfires can run 100 octane fuel.

http://www.wwiiaircraftperformance.org/ap1590b.jpg