i have a question about Bf 109s spinner cannon - Aircraft of World War II

WLS · 12-14-2005, 03:23 AM

anyone in here know that Bf 109s late type have one 20mm or 30mm cannon.

i have been collect many Bf's picture and i noticed that the muzzle hole on spinner is different according to Bf's type

in my opinion, Bf with 20mm MG 151/20 cannon have bigger diameter on it's spinner hole than Bf with 30mm MK108 cannon.

i think it's because of MG 151/20 have long barrel.

am i right? please let me know that

Lunatic · 12-14-2005, 04:21 AM

No.

For either type of cannon, the gun sits well behind the spinner. In fact it sat partially behind the engine, and completely behind the reduction gearing.

Both guns fired through a larger than gun-bore tube to reach through the spinner. The size of the hole might have varied considerably from design to design. It is quite possible that some 20mm versions had larger diameter holes than later 30mm versions, but this had nothing to do with barrel length. Probably, as the war progressed the design of the spinner became more aerodynamic and thus the size of the hole became smaller.

=S=

Lunatic

WLS · 12-14-2005, 05:08 AM

thanks.

in fact. i was compared G-6 picture with G-10/U4 picture.

i have checked again. then i found that G-6's hole is bigger than G-10's hole. there's nothing to do with barrel length but period

Lunatic · 12-15-2005, 03:40 PM

Someone here should be able to post a cutaway of the 109. If they do you will see the gun is mounted well back of the spinner.

=S=

Lunatic

DerAdlerIstGelandet · 12-16-2005, 07:24 PM

I will see if I can find a good cut away however I am sure someone will post one before I can find one.

CharlesBronson · 12-16-2005, 11:40 PM

I had put one several months ago in the already locked (

) Bf-109 topic.

Here:

http://img459.imageshack.us/img459/6...cutaway1ih.jpg

Lunatic · 12-17-2005, 07:22 AM

Well, that cut-away dosn't really show much of the MG151/20, but the breech is listed (i believe item 51), and it is just in front of the pilot. For the barrel to reach out the spinner, it'd have to be 15-20 feet long!

=S=

Lunatic

KraziKanuK · 12-17-2005, 10:29 AM

The forward mounting point for the cannon was in the same place for both 20mm and 30mm cannon. The barrel of the 151 was 550mm longer than the barrel of the 30mm. The mounting point was the inner end of the barrel.

The spinner from the F to K did not change. I would like to hear why the blast tube would be smaller for a weapon firing a shell 10mm larger. If anything it should be larger with the larger volume of propellant gasses from the 30mm. Also by going smaller, components such as the prop hub and prop reduction gear box would have to be redesigned as the blast tube ran through them.

If one wants cutaway drawings of the 109F-4 go to http://www.airwar.ru/other/draw/bf109f.html

DerAdlerIstGelandet · 12-18-2005, 10:24 AM

Well this diagram is wrong I believe anyhow. Based on a book about the Bf-109 that I am reading right now the Bf-109G-14/U4 had the Mk-108 30mm Cannon and not the MG-151.

Schtockus · 03-22-2007, 01:39 PM

Can anybody help with Bf 109 D and Bf 109 E cutaway ?

joebong · 03-23-2007, 10:45 PM

The only difference in spinner perf size is (As previously noted.) between E&F models. E models posessed this mod, in hope of a cannon never installed on this model. the reason for the size would seem to be, barrel cooling not caliber.

Tony Williams · 03-24-2007, 10:18 PM

The internal diameter of the blast tube was 70mm, which limited the guns which could be fitted there. That accounts for the slender barrel of the MG 151 - it was intended from the start for such a mounting.

Tony Williams: Military gun and ammunition website and discussion forum

12-14-2005, 03:23 AM	#1
WLS Junior Member Join Date: Dec 2005 Posts: 2	i have a question about Bf 109s spinner cannon anyone in here know that Bf 109s late type have one 20mm or 30mm cannon. i have been collect many Bf's picture and i noticed that the muzzle hole on spinner is different according to Bf's type in my opinion, Bf with 20mm MG 151/20 cannon have bigger diameter on it's spinner hole than Bf with 30mm MK108 cannon. i think it's because of MG 151/20 have long barrel. am i right? please let me know that

12-16-2005, 07:24 PM	#5
DerAdlerIstGelandet Der Crewchief Join Date: Nov 2004 Location: Ansbach, Germany Posts: 33,152	I will see if I can find a good cut away however I am sure someone will post one before I can find one. __________________ fly boy:"isnt that the first jet bomber becasue i have flown one in a flight sim before and i know how it handles"[/I]

12-16-2005, 11:40 PM	#6
CharlesBronson Senior Member Join Date: Jan 2005 Location: Cordoba - Argentina Posts: 2,999	I had put one several months ago in the already locked ( ) Bf-109 topic. Here: http://img459.imageshack.us/img459/6...cutaway1ih.jpg __________________ Bronsons´s videos

12-18-2005, 10:24 AM	#9
DerAdlerIstGelandet Der Crewchief Join Date: Nov 2004 Location: Ansbach, Germany Posts: 33,152	Well this diagram is wrong I believe anyhow. Based on a book about the Bf-109 that I am reading right now the Bf-109G-14/U4 had the Mk-108 30mm Cannon and not the MG-151. __________________ fly boy:"isnt that the first jet bomber becasue i have flown one in a flight sim before and i know how it handles"[/I]

03-23-2007, 10:45 PM	#11
joebong Member Join Date: Jan 2007 Location: In the bleak Mojave des. Posts: 80	The only difference in spinner perf size is (As previously noted.) between E&F models. E models posessed this mod, in hope of a cannon never installed on this model. the reason for the size would seem to be, barrel cooling not caliber. __________________ "I love it Brad, God help me, I do love it so." The devil's in the details, and sometimes he's in my sock drawer.

12-14-2005, 04:21 AM	#2
Lunatic Banned Join Date: Jun 2005 Posts: 191	No. For either type of cannon, the gun sits well behind the spinner. In fact it sat partially behind the engine, and completely behind the reduction gearing. Both guns fired through a larger than gun-bore tube to reach through the spinner. The size of the hole might have varied considerably from design to design. It is quite possible that some 20mm versions had larger diameter holes than later 30mm versions, but this had nothing to do with barrel length. Probably, as the war progressed the design of the spinner became more aerodynamic and thus the size of the hole became smaller. =S= Lunatic

12-14-2005, 05:08 AM	#3
WLS Junior Member Join Date: Dec 2005 Posts: 2	thanks. in fact. i was compared G-6 picture with G-10/U4 picture. i have checked again. then i found that G-6's hole is bigger than G-10's hole. there's nothing to do with barrel length but period

12-15-2005, 03:40 PM	#4
Lunatic Banned Join Date: Jun 2005 Posts: 191	Someone here should be able to post a cutaway of the 109. If they do you will see the gun is mounted well back of the spinner. =S= Lunatic

12-17-2005, 07:22 AM	#7
Lunatic Banned Join Date: Jun 2005 Posts: 191	Well, that cut-away dosn't really show much of the MG151/20, but the breech is listed (i believe item 51), and it is just in front of the pilot. For the barrel to reach out the spinner, it'd have to be 15-20 feet long! =S= Lunatic

12-17-2005, 10:29 AM	#8
KraziKanuK Banned Join Date: Jan 2005 Posts: 795	The forward mounting point for the cannon was in the same place for both 20mm and 30mm cannon. The barrel of the 151 was 550mm longer than the barrel of the 30mm. The mounting point was the inner end of the barrel. The spinner from the F to K did not change. I would like to hear why the blast tube would be smaller for a weapon firing a shell 10mm larger. If anything it should be larger with the larger volume of propellant gasses from the 30mm. Also by going smaller, components such as the prop hub and prop reduction gear box would have to be redesigned as the blast tube ran through them. If one wants cutaway drawings of the 109F-4 go to http://www.airwar.ru/other/draw/bf109f.html

03-22-2007, 01:39 PM	#10
Schtockus Member Join Date: Mar 2007 Posts: 41	Can anybody help with Bf 109 D and Bf 109 E cutaway ?

03-24-2007, 10:18 PM	#12
Tony Williams Senior Member Join Date: Nov 2004 Posts: 273	The internal diameter of the blast tube was 70mm, which limited the guns which could be fitted there. That accounts for the slender barrel of the MG 151 - it was intended from the start for such a mounting. Tony Williams: Military gun and ammunition website and discussion forum Last edited by Tony Williams; 03-24-2007 at 10:18 PM. Reason: sig

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