Bf 109 H WNr.110073

[pvanroy]

First off: many thanks for posting that Bauzustand for the Guyancourt 109 H - I had not seen that before!

Just a couple of thoughts:

- You indicate that the regular pressurized canopy was later replaced by an Erla Haube. On what information is this based? A pressurized version of the Erla Haube was developed, and prototyped, but I have never seen it installed on an actual airframe. If it was installed on the 109 H that would be really interesting.
- Since the aircraft was pressurized, there should be a small intake on the right side of the cowling for the compressor of the pressurization system (as on a regular G-5). As an aside, I have never seen images of an AS cowling with an intake for the cabin pressurization compressor.
- Since the machine was constructed on the basis of a standard G-5 converted to AS, it seems likely that it used the regular AS cowling. However, for the 109 H, a more refined cowling was planned, which ultimately saw use on the Erla produced G-10. So, it cannot be excluded entirely that the Guyancourt machine may have had the refined cowling.
- The Bauzustand report states that the radiators were positioned in the wing extension "as in the 109 H V55". According to some interpretations, the H V55 had the radiators incorporated into the leading edge of the wing extension.
- The Restabdeckungen for the main gear may not have been entirely like those of the K. Messerschmitt also designed Restabdeckungen for the G, but these were not introduced widely, although some individual machines were equipped with them (e.g. Graf's G-6). The Restabdeckungen for the G were metal, whereas those of the K were wood. Also, in the G they were actuated hydraulically, whereas in the K it was through a pulley system connected to the main gear retraction system. However, this would not really be visible in your drawings.
- Your side views show the aircraft with a regular 109 G wing (no extended tip, slats, ailerons or flaps).
- Two of the links in your post both lead to the same Bauzustand report.

Just my 2 cents!

[Nick Beale]

If it helps, this is the verbatim text of teleprint CX/MSS/T187/48 (TNA file HW5/484)

WEST EUROPE

TO TECHNICAL OFFICER, DATED 16/5:-

THE STAFFEL REPORTS SURRENDER OF BF 109 G-5, WORKS NO 1(B%1)0346, THROUGH SALVAGE DETACHMENT 20/IV ANVIEN(+) TO GUYANCOURT WORKSHOP ON 14/5. THE STAFFEL REPORTS ACCEPTANCE OF BF 109 H, WORKS NO. 110073 ON 16/5, FROM GUYANCOURT WORKSHOP. A/C HAS DB605-GS ENGINE MMM METHANOL INSTALLATION AND GM1- INSTALLATION, CAMERA 50/30, FU GE 16 Z, WITH HOMING ATTACHMENT ZVG 16, FA16E AND FA16S, PRESSURE CABIN, AND 1 MG 151-20.

NOTES: 1) SOURCE BELIEVES ABOVE FROM 5(F)123

2) (+) NOT LOCATED. MAY BE ANVIN, LOCATED IN PAS DE CALAIS AREA

3) AN ME 109 WITH H BUILT IN £H - EINBAU£ WAS READY TO BE COLLECTED FROM GUYANCOURT ON 10/5 (T182/3)

4) SEE T187/47 FOR TECHNICAL DEFECTS IN THE COMPRESSED AIR SUPPLY OF BF 109 G-5 (HIGH ALTITUDE A/C).

1752/17/5/44

[piero]

Originally Posted by pvanroy

First off: many thanks for posting that Bauzustand for the Guyancourt 109 H - I had not seen that before!

Just a couple of thoughts:

- You indicate that the regular pressurized canopy was later replaced by an Erla Haube. On what information is this based? A pressurized version of the Erla Haube was developed, and prototyped, but I have never seen it installed on an actual airframe. If it was installed on the 109 H that would be really interesting.
- Since the aircraft was pressurized, there should be a small intake on the right side of the cowling for the compressor of the pressurization system (as on a regular G-5). As an aside, I have never seen images of an AS cowling with an intake for the cabin pressurization compressor.
- Since the machine was constructed on the basis of a standard G-5 converted to AS, it seems likely that it used the regular AS cowling. However, for the 109 H, a more refined cowling was planned, which ultimately saw use on the Erla produced G-10. So, it cannot be excluded entirely that the Guyancourt machine may have had the refined cowling.
- The Bauzustand report states that the radiators were positioned in the wing extension "as in the 109 H V55". According to some interpretations, the H V55 had the radiators incorporated into the leading edge of the wing extension.
- The Restabdeckungen for the main gear may not have been entirely like those of the K. Messerschmitt also designed Restabdeckungen for the G, but these were not introduced widely, although some individual machines were equipped with them (e.g. Graf's G-6). The Restabdeckungen for the G were metal, whereas those of the K were wood. Also, in the G they were actuated hydraulically, whereas in the K it was through a pulley system connected to the main gear retraction system. However, this would not really be visible in your drawings.
- Your side views show the aircraft with a regular 109 G wing (no extended tip, slats, ailerons or flaps).
- Two of the links in your post both lead to the same Bauzustand report.

Just my 2 cents!

First of all, thank you for your articulate answer.
- regarding the Erla-Haube I invite you to read the first document, or the answer that Nick Beale gave immediately after you
- it seems, I say it seems, that there were Bf 109s pressurized both with that without the small intake on the right side of the cowling, in any case the refined cowling did not have it, at least in the production airplanes
- I think the radiators were positioned as on the V50 or V54
- I agree perfectly with you on the two different types of Restabdeckungen, I wrote 'K' to clarify the concept (I did not want to write too much on the drawing)
- you are also right on the side profiles, but you must know that the proposed drawing was not done by me (I absolutely do not know how to draw ), but it's a collage made with various other designs and I didn't find a good side view of the 'long wings'
- I fixed the links in the meantime.


Giampiero

[harrison987]

There are also quite a few well-known drawings on the web...