Quote:
Originally Posted by cheesehawk
Osprey,
Side note, I don't know where it states in the German reference that the Spit was on 87 octane, surely the Germans had it available, just not in quantity. At this point of the war, weren't the Germans still importing fuel from Russia, and using stocks captures from France (i.e. French and British fuels)?
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There is no reference about which octan fuel was used. But there is reference that both Spit and Hurrciane had 2 stage prop pitch.
Looking at speed comparision between Rechlin tested Spitfire, Hurricane and 109 E it is clearly too me that British fighters were used only 87 octan fuel.
" Speed: the Spitfire is at 0 m by ca. 20 km/h, at 4 km by ca. 10 km/h, Hurricane and
Curtiss at 0 and 4 km altitude by ca. 60 km/h. A similar superiority of the Bf 109 E
exists in the climb performance as well."
So in Rechlin test 109 E at sea level was faster by 20 km/h from SPit and 60 km/h from Hurrciane.
100 Octan fuel Spitfie MK1 ( +12 lbs) was faster then 109 E at low to medium alts and Hurriciane ( +12 lbs) should be slowier about 20-30 km/h then 109 ( at low alts)
It is clearly to me that British fighters in Rechlin used only lower 87 octan fuel.
RL Data Speed for comparsion between Sptfire MK1 +6 1/2 lbs (blue line) - Spit MK1 +12 lbs ( red) - Hurricane MK1 +12 lbs ( green) - 109 E-3 1.45 Ata ( black - based on German manual)
500 km/h at sea level is the best speed score for 109 E-3 as i saw in RL data ( it is from german manual for E-3 ) but most common known speed score is 467 km/h at 1.3 Ata ( 5 Minute Emergency Power). For SPitfire MK1 at + 6 1/2 lbs (87 octan fuel) is ab. 450 km/h ( 280 mph) and for Hurricane MK1 at 6 1/2 lbs ( 87 octan fuel) is ab. 426 km/h ( 265 mph).
And disscussion about how many squadrons used 100 Octan fuel during BOB is pointless to me. WE know that many squadron used 100 Octan fuel during BOB expecially these most importants sectors squadrons. So both version were used during BOB.
So to be fair we should have 2 or 3 version of Spitfire MK1 and Hurricane MK1 - with 2 stage prop pitch and 6 1/2lbs (pre BOB version without pilot armour and armoured windshield), 2 stage prop pitch at 12 lbs (early BOB version) and CS propeller at 12 lbs.