Author Topic: Spit Mk1A climbrate  (Read 3490 times)

Offline FalconSix

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« Reply #30 on: August 03, 2005, 11:42:05 PM »
It also says 310 mph on the deck. That's faster than the Spit5.

Offline Kev367th

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« Reply #31 on: August 03, 2005, 11:47:50 PM »
Could part of be in AH you can only run WEP 5 mins in Spits, where actually they would run it for much longer periods?
This possibly throw up discrepencies?

Unfortuneately spitfireperformance.com I can't find a performance chart for a Mk I @ 100/12lbs.
« Last Edit: August 03, 2005, 11:51:48 PM by Kev367th »
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Offline FalconSix

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« Reply #32 on: August 03, 2005, 11:49:37 PM »
I have no idea.

Offline 1K3

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« Reply #33 on: August 03, 2005, 11:54:58 PM »
Quote
Originally posted by FalconSix
It also says 310 mph on the deck. That's faster than the Spit5.


its not faster at deck than our current spit 5

the current spit 5 uses higher boost (+16)

Offline Kev367th

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« Reply #34 on: August 04, 2005, 12:10:13 AM »
I suppose its quite possble the early Mk V's being heavier even with a more powerful motor werent that much faster.

eg here lists a Mk Vb (Merlin 45) were top speed is 374 at 19k.

http://www.spitfireperformance.com/spitv.html

Plus - You have to remember that different variants of the Merlin were designed to produce max power at different alt ranges. Hence the later LF ,F ,HF designations of Spits from the V onwards, HF only on later models.
i.e. a Merlin 55M (low alt) version produced most power down low therefore max speed was achieved at lower altitudes.

Also add to that its 'easier' to achieve a higher speed at alt due to less air, if you look at most of the later Merlins the lower alt versions generally produced more HP than the high alt versions.

eg (first Mk V's)
Merlin 45 - F Vb , F Vc 1470HP
Merlin 45M - LF Vb, LF Vc 1585HP

good eg is spit IX
LF had 1580HP Merlin 66
F had 1565HP Merlin 61
HF had 1475HP Merlin 70

Maybe its possible the Spit 1 at lower alts with WEP on is faster or as fast OTD as the F Vb/c that were fitted with a Merlin 45 designed to produce max speed at a higher alt?

So I guess it depends which Mk V you are comparing it to.

Dunno just throwing out ideas.
« Last Edit: August 04, 2005, 12:15:05 AM by Kev367th »
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Offline justin_g

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« Reply #35 on: August 06, 2005, 06:43:41 AM »
Spitfire I with Merlin III at +6lbs has 1030hp
Spitfire I with Merlin III at +12lbs has 1300hp
Spitfire V with Merlin 45 at +9lbs has 1185hp
Spitfire V with Merlin 45 at +16lbs has 1470hp

Offline Kurfürst

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« Reply #36 on: August 06, 2005, 09:28:45 AM »
100 octane fuel and +12 lbs was not common in service until the Battle of Britiain already ended in october 1940. The RAF could not convert all fighters to it until November, 1940.

Without 100 octane fuel, +12 lbs boost was not possible.
There are claims made by some that 100 octane fuel was throughlty, and without exception introduced to all and every fighter as early as the spring of 1940, but unfortunately there`s no evidence behind the claim, and it appears to be more like the wet dream of some fanboys.

The following is from documents from the Australian archives :


"The first bulk shipment of 100 octane fuel had arrived in Britain in June 1939 from the Esso refinery in Aruba. This and subsequent tanker shipments from Aruba, Curacao and the USA were stockpiled while the RAF continued to operate on 87 octane petrol. Having secured what were considered reasonably sufficient quantities of 100 octane, Fighter Command began converting its engines to this standard in March 1940, allowing boost (manifold) pressures to be raised without the risk of detonation in the cylinders.

By the time of the invasion of the Low Countries by Germany in May 1940 the RAF had converted approximately 25 % of it's total fighter force to 100 octane fuel use. The subsequent escalation in air activity and demands placed upon Fighter Command over the next two months put great strain on both the 100 octane fuel stockpiles and aircraft modified to use the fuel. Against the backdrop of total war the RAF found that it's reserves of 100 octane fuel was well below the level considered necessary for widespread use, for any sustained length of time.

Two actions were immediately undertaken by the British War Cabinet in May to resolve the looming crisis. Firstly 87 octane fuel was deemed the primary fuel source to be used until further supplies could be discovered and delivered in sufficient quantities to allow the Merlin conversions to again take place. Those existing fighters already so converted (approximately 125) would continue to use what supplies of 100 octane were available, but all other fighters that had not been modified to continue with the use of 87 octane (of which there was more than adequate supply). The second action was for the British Government to contract the Shell Oil Refining Company to assist the British-controlled Iraqi Petroleum Company at Kirkuk to produce 100 octane fuel. This arrangement proved quite successful as production was quickly converted to 100 octane fuel.

The first Middle East shipment of 100 octane fuel arrived in Portsmouth on 12th August, with a further two deliveries in September and four in October. Although too late to allow widespread conversion for the use of the fuel the deliveries did ensure that from this point on Britain would not be lacking in 100 octane fuel levels. With the newfound supply RAF Fighter Command again embarked upon a Merlin II and III conversion to 100 octane use from late September, finally achieving 100% conversion of it's fighter force by the end of November in 1940.

http://www.allaboutwarfare.com/forums/index.php?showtopic=230&hl=



I came across it when I was in fact researching another subject (Dutch East Indies Fuel levels prior to the Japanese Invasion) at the Australian War Memorial Archives.

It's from a document, copied to the Australian Military Commission in England in February 1941, by Roll Royce to Lord Beaverbrook outlining past, current and proposed changes to the Merlin; and factors that affect it's performance.

It was quite an interesting paper actually, even though i found it to be a very dry subject.


It was a collection of lose-leaf typed pages, included as an addendum in a report titled Fuel Supplies to The British Empire And It's Commonwealth; Outlook, Ramifications and Projections For The Prosecution Of The War.

The reason why it is included amongst AWM papers is because the Australian Government at that time was protesting vigoriously about the continued supply of lower grade 87 octane fuel when it too wanted 100 octane for the RAAF.

I believe that McFarland, Pugh, Hart, Perret, Lumsden and even Churchill have all quoted parts from the report. "
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Offline MiloMorai

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« Reply #37 on: August 06, 2005, 10:36:38 AM »
Quote
Originally posted by Kurfürst
it appears to be more like the wet dream of some fanboys.

My my Barbi throwing the insults around, again.

Nice of you to include the link so people can see your selective quote.

For those that can't read the thread.

This is also what the poster said:

question
"or were the British deceiving to the Australians?"

I wouldn't be surprised. The British did quite a bit of that during both World Wars.

more from the link

4./ 11/7/40 RAF had 343,000 tons of 100 octane in store.

5./ 10/10/40 RAF had 424,000 tons of 100 octane in store. After 22,000 tons issued during the B of B.

1 ton = 2240lb, 1 barrel = 35gal.

Other can do the math but it is a very large number of Spit sorties.

Offline Nashwan

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« Reply #38 on: August 06, 2005, 10:42:11 AM »
Quote
The following is from documents from the Australian archives :


Just to make it clear, what Isegrim/Kurfurst is claiming comes from the Australian archives actually comes from someone called "PipsPriller" on another forum. And he's not quoting from the Australian archives, he's giving his interpretation of what he read some time before. He couldn't actually provide any of the material, and still hasn't, a year or more later.

What the actual British archives say is that as of November 1940, the reserves of 100 octane fuel in the UK stand at 500,000 tons. They also give actual British consumption of 100/130 fuel as an average of 2,500 tons per week in 1940.

In 1940, the fuel capacity of the Spitfire was 85 gallons, or 612 lbs. No drop tanks were in use.

If each Spitfire used an entire tank full of fuel (ie it landed empty), you'd get 3.6 sorties per ton. An average of 2,500 tons per week would allow for over 9,000 Spitfire and Hurricane sorties per week, if all the fuel went to Fighter Command.

In actual fact, during the BoB Fighter Command averaged about 4,000 sorties per week, for the rest of the year they averaged much less.

Wood and Dempster, The Narrow Margin, says Fighter Command used 22,000 tons of 100 octane fuel 1oth July - 10th October, which is enough for 6,000 sorties per week, in actual fact FC flew about 4,000 operational sorties per week, so there was plenty left over for wastage and testing (note the 22,000 tons figure is for Fighter Command, not the RAF as a whole, or British industry)

So, against "Pips Priller's" interpretation of what he remembers from the Australian archives about British fuel use, we have actual fuel use from the British archives, which shows far more 100 octane was used than was sufficient for fighter command.

I suspect Pips Priller is confused between Fighter Command and the whole RAF, with parts of the RAF not switching over to 100 octane fuel, whereas the whole of Fighter Command did (naturally enough, FC was the priority in 1940)

Mike Williams has evidence for 18 Spitfire squadrons during the BoB using 100 octane (there were 19 Spitfire squadrons in the BoB).

All the evidence supports 100 octane being the standard fuel for FC during the BoB. "Pips Priller's" claims on another board contradict it.

I know which I'll trust.

Offline Kurfürst

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« Reply #39 on: August 06, 2005, 12:40:30 PM »
That`s what I was referring to. Some fanboys are ignoring the evidence foubd by Pip, and try to dismiss it by any means.

Tough part is, guys like Mike Williams who is quite well known for manipulating evidence (see the link in my sig) claims that 100 octane was standard during the whole battle in 100% use all the time, but they cannot provide any evidence to it at all.

All they would have to post is the amount 87 octane and 100 octane fuel consumed by Fighter Command; they were in the archives and found fuel docs, but are unwilling to post such information, obvious why.

As for Nashwan, aka Hop, aka Lord Haw-Haw the various nick he used on other boards, the same story. No evidence, but would like to dismiss Pips`s finding from the Australian archieves. He isn`t thinks twice when it comes being liar, or to come up with NAZI accusations instead of real arguements, but that`s another matter. In short, he is a moral piece of **** I`d not even touch with a stick.

Now this guys claims Wood and Dampster says 22 000 tons would be enough for 6000 sorties a week - bullocks as WandD notes 22000 tons being used up, but doesn`t say anything about how much it was good for.

Which brings a question how much 22000 tons were worth. In 1944, the 8th FC used up 20 000 tons of fighter fuel a SINGLE month.
The RAF used up 12 000 tons, and it was enough for 10 000 sorites.

Yet we are to  believe that by some miracle, 1940, 2/3s of this amount was enough for not ONE month but FOUR...  

Moreover both posters are selective qouting the thread, Neil Stirling`s posts to be precise who denies the gradual standardization of 100 octane... but his posts also contained the list of the 100 octane reserves that stood at 500 000 tons in Nov 1940, which the British estimated to be enough for 80 weeks at present consumption.

This gives the fuel consumption in early Nov 1940 as  500 000 t/ 80 weeks = 6250 tons per week. We also know that by that time, most of Fighter Command was running on 100 octane (funny these guys don`t debate this from the Australian Archives, just the parts they don`t like).

Obviously, if 22 000 tons was suplied during July-October (3 months or 12 weeks), and 6250 tons was consumed every week by the time FC completely switched over... well 22 000 t supplied / 6250 tperweek = 3.5 weeks of consumption provided every fighter is supplied with 100 octane fuel.

In other words, the 22 000 months supplied during the Battle was enough for less than a month (let`s remember the 8th FC and the ADGB consumed 32 000 tons in a single month in mid1944)...

... or for all 3 months from July to October, the period WandD gives, if on avarage only 1/3 of the fighters were using the fuel.
It is more likely of course, and the normal go of things, that the fuel was little used - being on short supply - initially, then more and more was issued.

Moroever it agrees with the 1941 British records found in Australian archives, which state 25% of the fighters using the stuff shortly before BoB, in May 1940. It probably grow 50%, then 75% and finally to 100% by the end of November. On avarage, it was probably around 35% as the sources notes, given that the first abroad shipments only arrived late in the Battle, in August and September.


To summerize, a wartime British report on fuel situation from 1941 notes that around 125 fighter of the FC had 100 octane before the battle, and they gradually switched over by November.

It makes sense, it`s supported by WandD figures of 100 octane usage in the Battle compared to avarage British fuel consumption in November.

Some revisionist like Mike Williams and Neil Stirling, both grown quite infamous lately for manipulating evindece and having an obvious pro-RAF bias, challange these facts, and claim something that never happens in real life like sudden, immidiate and complete changeover in a single month.

They are unable to show fuel deliveries, They are unable/unwilling to show the relative fuel usage of 87/100 octane fuel, they are unable to show serious evidence like how much fuel was issued in July, August, September or October.

Moreover we see that they cannot give reasonable answers to why some docoments disagrees with their claims, and merely dismiss the counter-evidence in kneejerk reaction. When asked to provide evidence to their claims they don`t answer but disappear.

Personally, I`d like to see what real evidence they can offer, such would be fuel deliveries or the unit`s Operational records noting the use of +12lbs. But no such evidence seem to exists on the large scale, which hardly makes the whole 100octane claim series more than the wishful wet dreams of a handful of agenda driven nationalists.
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Offline Krusty

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« Reply #40 on: August 06, 2005, 12:48:40 PM »
Quote
Originally posted by 1K3
its not faster at deck than our current spit 5

the current spit 5 uses higher boost (+16)


Current SpitV at +16 boost flies 290 without wep and 309 with wep. on the deck. Full out.

Offline Kev367th

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« Reply #41 on: August 06, 2005, 02:08:47 PM »
Well was wondering where Kurfurst had got to, he's back with a vengence huh?

March 1940 Spits conversion to 100 grade began
May 1940 Churchill comes to power, stockpile of 100 grade fuel released to squadrons (co-incidence, huh).

As usual you hype everytihng, no-one claimed EVERY fighter used 100 grade, but that by the BoB enough had been converted to make it the most common fuel used by Spits.

They started conversion by in March and you said completed in November.
OK thats 8 months so assuming a steady conversion rate by the Start of July 50% would be on 100 grade. Thats assuming a steady conversion rate, personally I would think they would have converted faster near the beginning with the upcoming battle that was obviously coming, and slowed down Sept onwards after it had fininshed.
This would also mean assuming steady conversions by Sept the end of the battle 75% would have been on 100 grade.

Isn't it nice when someone takes your own figures and turns them back on you. You said completed Nov, no-one else did, I know they started conversions in March.
« Last Edit: August 06, 2005, 02:21:56 PM by Kev367th »
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Offline MiloMorai

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« Reply #42 on: August 06, 2005, 02:41:46 PM »
So Barbi brings up 100 fuel deliveries. Yet he absolutly ignores, fails and is unwilling to provide any documention for C3 fuel deliveries to 109K-4 units that required it for 1.98.

Strange that Barbi ignores what Pips said about the Aussies being deceived by the Brits with regards to 100 fuel which casts doubt on the document. Naturally he picks what suits your agenda and ignores that which does not.

Quote
The RAF used up 12 000 tons, and it was enough for 10 000 sorites.

Crips Barbi, one Lancaster carried 2154gal of fuel. The Halifax  carried a simular fuel load. A Mosquito carried 453 gal. Would not be hard for these 3 bombers to burn most of that 12,000t. The a/c of 1944 were more thirsty than those of 1940.  And you yap about others being deceptive and manipulating data.

Barbi, it is not that were not enough 100 fuel but the conversion of a/c to take the 100 fuel. Any replacement a/c would be so converted. So if we are to believe your claim of low TBO for the Merlin it would take no time to convert. Also remember that 11 Group was the principle opponent to the LW and would get prioity on 100 fuel Spits.

22,000t for 12 weeks is 1833 t/wk. That is enough for 5990 (only 10 short of 6000 :eek: ) Spit sorties, so I don't know what you are going on about. Nashwan already stated the average was 4000 sortie/wk.

Offline Nashwan

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« Reply #43 on: August 06, 2005, 04:02:19 PM »
Quote
As for Nashwan, aka Hop, aka Lord Haw-Haw the various nick he used on other boards, the same story. No evidence, but would like to dismiss Pips`s finding from the Australian archieves. He isn`t thinks twice when it comes being liar, or to come up with NAZI accusations instead of real arguements, but that`s another matter. In short, he is a moral piece of **** I`d not even touch with a stick.


Don't think I've ever gone by the name Lord Haw Haw, I think that would suit your style better. I post on forums as Hop or Nashwan, and have never made any secret of the fact I use both names, and in fact point it out to people if they know me by a different  name from elsewhere.

Quote
Now this guys claims Wood and Dampster says 22 000 tons would be enough for 6000 sorties a week - bullocks as WandD notes 22000 tons being used up, but doesn`t say anything about how much it was good for.


No, I said Wood and Dempster said 22,000 used, I didn't say they gave the figure for how many sorties. English isn't your first languauge so I'll forgive you for this.

Quote
Which brings a question how much 22000 tons were worth. In 1944, the 8th FC used up 20 000 tons of fighter fuel a SINGLE month.


How much fuel did a Mustang or Thunderbolt carry compared to a Spitfire I or Hurricane I? And that ignores the numbers.

FC had about 600 - 700 fighters operational, the 8th would fly far more sorties than that in a day, sometimes that many on a single raid.

Quote
Yet we are to believe that by some miracle, 1940, 2/3s of this amount was enough for not ONE month but FOUR...


When the Spitfire and Hurricanes carry less than a quarter as much fuel, and there are far fewer of them, why not? (from memory the P-47 with tanks could carry as much as six times the fuel of a 1940 Spitfire or Hurricane)

And it's three months, 10th July to 10th October, that's 3 months by our calendar.

Quote
Moreover both posters are selective qouting the thread, Neil Stirling`s posts to be precise who denies the gradual standardization of 100 octane... but his posts also contained the list of the 100 octane reserves that stood at 500 000 tons in Nov 1940, which the British estimated to be enough for 80 weeks at present consumption.


No, not ignoring it at all, Isegrim.

Quote
This gives the fuel consumption in early Nov 1940 as 500 000 t/ 80 weeks = 6250 tons per week.


Right. That probably fits with the average of 2,500 tons a month for the whole of 1940, consumption would have increased towards the end of the year because of the gradual switch over throughout the RAF.

Quote
We also know that by that time, most of Fighter Command was running on 100 octane (funny these guys don`t debate this from the Australian Archives, just the parts they don`t like).


Well all, or almost all, I think.

Quote
Obviously, if 22 000 tons was suplied during July-October (3 months or 12 weeks), and 6250 tons was consumed every week by the time FC completely switched over... well 22 000 t supplied / 6250 tperweek = 3.5 weeks of consumption provided every fighter is supplied with 100 octane fuel.

In other words, the 22 000 months supplied during the Battle was enough for less than a month (let`s remember the 8th FC and the ADGB consumed 32 000 tons in a single month in mid1944)...


Slight logical flaw here. You are ASSuming 6250 tons a week in November 1940 was just for Fighter Command. Do you have any evidence to support that? The report certainly doesn't say it.

Of course, the more likely conclusion is that Fighter Command was burning about 1 - 2,000 tons a week, and the rest of the RAF, as well as the aircraft and engine makers, were burning the rest.

Quote
Moroever it agrees with the 1941 British records found in Australian archives, which state 25% of the fighters using the stuff shortly before BoB,


Do the records show that? I don't think Pips has ever provided them, has he?

I suspect the records show 25% of the RAF burning 100 octane, not 25% of fighter command.

Quote
It probably grow 50%, then 75% and finally to 100% by the end of November. On avarage, it was probably around 35% as the sources notes, given that the first abroad shipments only arrived late in the Battle, in August and September.


The problem with this is the Wood and Dempster figure. If 22,000 tons for fighter command was only powering a third of their sorties for the period, then you get about 220,000 FC sorties in 13 weeks during the BoB, or about 17,000 a week.

But the records don't show anything like that number of sorties, in fact they show about 4,000 a week.

Quote
To summerize, a wartime British report on fuel situation from 1941 notes that around 125 fighter of the FC had 100 octane before the battle,


No, to summarize an Australian claims that an Australian report says that.  British reports say an average of 2,500 tons used a week, 500,000 tons in stock by November 1940, 22,000 tons used by FC in 13 weeks, enough for 1.5 times the number of operational sorties they actually flew.

Quote
It makes sense, it`s supported by WandD figures of 100 octane usage in the Battle compared to avarage British fuel consumption in November.


Wood and Dempster specifically say fuel for Fighter Command, the November report is for all British consumption.

The RAF had other commands in 1940, bombers, transports, coastal, etc, plus industry always used some for engine testing etc.

Quote
They are unable to show fuel deliveries, They are unable/unwilling to show the relative fuel usage of 87/100 octane fuel, they are unable to show serious evidence like how much fuel was issued in July, August, September or October.


Well, Isegrim, Neil has shown fuel stocks, and fuel consumption, for 1940. Mike has shown usage in 18 Spitfire squadrons during the BoB.

You have reposted a precis from an Australian, that hasn't been backed up by any original documents.

Quote
Moreover we see that they cannot give reasonable answers to why some docoments disagrees with their claims,


What documents? Don't you mean Pips interpretation of some documents? He hasn't actually quoted anything, just given his interpretation. And so far he still hasn't backed it up.


Quote
Current SpitV at +16 boost flies 290 without wep and 309 with wep. on the deck. Full out.[/quotes]

Sounds a bit slow. AA 878, a Spit VC with 4 20mm cannon, did 317 mph at sea level at 16 lbs, and AA878 was slower than several other tested Spit Vs.

Offline Kev367th

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« Reply #44 on: August 06, 2005, 04:55:25 PM »
Lol only Kurfurst would compare 1944 8th AF fuel consumption with the later and more thirsty planes to a 1940 RAF comsumption with Spits/Hurris

Insane spring to mind?
As I've said your figures etc tend to be reasonably accurate, however your intepretation and comparisons leave a lot to be desired.
« Last Edit: August 06, 2005, 04:58:11 PM by Kev367th »
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