Friedrich-4B

From AN-01-60JE-2 'Erection and Maintenance Instructions for Army Model P-51D-5 through -25 and P-51K-1 through -15 British Model Mustang IV ' Instructions for setting up and boresighting the M2 Brownings, plus information on the gunsights:

Hi Krebs; Total capacity was 28 US gallons = 23 Imperial gallons = 106 litres: the normal capacity was 19 US gal = 16 Imp gal = 72 L, with 9 gallons of expansion capacity; more than 19 gallons was considered overload: P-47D Flight Operations charts including take-off runs, climb data, landing distances and range with various fuel loads.

P-47D Fuel, Hydraulic and turbocharger Systems:

From the Pilot's Flight Operating Instructions for Army Models P-47D-25, -26, -27, -28, -30 and -35 Airplanes; British Model Thunderbolt (AN-01-65BC-1A 25 January 1945): Cockpit arrangement

Non, non, non!! For Normandy, a Calvados cider!:drink:

Data for the Merlin 66: And Merlin 61:

Not worried, just interested - there doesn't seem to be much documentation relating to the K-4, and the same issues and debates with respect to the use of 1.98 ata crop up time and time again in various forums. IMO it is more than likely it is something which will never be satisfactorily resolved, because the relevant information is either long gone, or there isn't, as yet, enough information available to be absolutely certain about what happened in the last few weeks of the European theatre. Hopefully the relevant information will be found, and all credit given to the researcher who finds it.

Thanks for that- I'd forgotten that many of the German documents are on microfilm. :thumbup: My main point is that it just seems that whenever the 109K-4 is mentioned exactly the same stuff turns up time and time again. I like the K-4 and would like more information on the subject, because at present there are too many loose ends. I don't live in Europe and don't have the same access to archival material that those who live on the continent do. Is there any new documentation that can be contributed that will help clear up the use of 1.98 ata?

These are the JG 26 Gruppen bases from 6 June 1944: Note that the units had taken up position near Paris, except for the Geschwader Stab which was to the north-east at Poix Nord OR (with roads) I think the modern road network dominates too much... For some reason the labels reproduce as blank spaces but read (for now) Cormielles-en-Vexin I./JG 26: 6 June - 8 June 1944 Guyancourt II./JG 26: 6 June - 13 July 1944 Villacoublay-Nord: III./JG 26: 6 June - 17 August 1944 Stab: Poix Nord 6 June - 20 June 1944

Thanks for that Merlin - great map I've been doing some preliminary plotting of JG 26's bases off Google Earth using Don Caldwell's JG 26 diaries: (Froberville is the site of an Fw 190 crash which is now being surveyed and excavated http://forum.gaijinent.com/index.php?/topic/19085-a-fw190-and-the-body-of-the-pilot-inside-find-in-normandie-this-month/ )

Description of Jumo 213A from Moteren-Handbuch December 1943:

The E wing started as a conversion set (Mod 1029) which was applied to C wing Spitfires: From Christopher Shores and Chris Thomas 2nd Tactical Air Force Volume 4.

Other early Spitfire IX physical differences: tear drop fairing behind spinner, starboard side; small teardrop fairings on upper engine cowling Flat sided canopy, headrest and, not mentioned, Spitfire VC style double cannon bulges on cannon access doors, original, smaller horn balances on elevators and rectangular rear-view mirror; Mk II IFF aerials from horizontal tail tips to fuselage: Some Spitfire IXs had mod 820 which removed the outer cannon stub: From Matusiak 2011 pages 8, 5 and 14 respectively.

Going back a ways; early production Mk IXs modified from Mk VC airframes (built by Supermarine & Rolls-Royce Hucknall) was the continued use the elevators with the small horn balance: Whereas the majority of the production Mk IXs built by Castle Bromwich used elevators with larger horn balances: these modified balances alleviated the slight imbalance brought about by the longer, heavier engine (the Pilot's Notes below are for the Mk VII & VIII and are the genuine article from WW 2)

One possible loadout for Spitfire IXs would be the special XXX rated supplies? How would a Spitfire fly on XXX octane, should the pilot accidentally switch to drop tanks?:pilotfly: