ORIGINAL: Terminus
I forget the name of the system that actually made the Luftwaffe's job easier, but there was one ESM system that the nightfighters could home in on...
You're probably thinking of the Monica system?
Moderators: wdolson, MOD_War-in-the-Pacific-Admirals-Edition
ORIGINAL: Terminus
I forget the name of the system that actually made the Luftwaffe's job easier, but there was one ESM system that the nightfighters could home in on...


ORIGINAL: Dixie
ORIGINAL: Apollo11
How is the visibility from the rear turret Martin?
IIRC the Lancaster rear gunners very often complained that visibility was poor (or perhaps this was due to high altitude flying and freezing of perplex)?
It's not too bad, the gunsights would be an added lump in the way of the vision I suppose. The gunners would either cut some of the perspex out or remove the whole sheet due to the thing either icing up or getting scratched. The side panels etc didn't matter too much as they would rarely keep the turret still for long. Taking out the perspex improved the view but at the cost of removing any potential of keeping warm in there. Ours has the hydraulics disabled so the only way to turn it is by rotating by hand. I'm not a big fan of only being held in by a pair of sliding doors though!
As sat in the turret with it locked facing rearwards your eyeline is 'above' most of the metal work in the turret as viewed directly rearwards. The view from 9 to 11 o'clock, and 1 to 3, is partly obscured by framework and gun mountings. There's a clear view directly out at 9 and 3 o'clock past the rudders.
There was an improved turret made by Rose Brothers which came along late in the war, it was much bigger and had better visibility as well as twin .50 cals instead of the Browning .303 guns of the Fraser Nash turrets. The gunner could also wear his parachute whilst sat in the turret instead of having to stow it outside so bailing out was a matter of just tumbling over the guns and into space.
![]()

ORIGINAL: Dixie
ORIGINAL: Terminus
I forget the name of the system that actually made the Luftwaffe's job easier, but there was one ESM system that the nightfighters could home in on...
You're probably thinking of the Monica system?
ORIGINAL: Terminus
ORIGINAL: Dixie
ORIGINAL: Terminus
I forget the name of the system that actually made the Luftwaffe's job easier, but there was one ESM system that the nightfighters could home in on...
You're probably thinking of the Monica system?
That's the one.

ORIGINAL: Apollo11
Hi all,
ORIGINAL: Terminus
ORIGINAL: Dixie
You're probably thinking of the Monica system?
That's the one.
The "Monica" was almost totally unusable because it gave enormous number of "false alarms" due to proximity of other friendly bombers in the bomber stream... most Lancaster crews simply turned it OFF... [;)]
Leo "Apollo11"
P.S.
Germans also developed very successful passive radar receiver that homed on "Monica" signals - it was not good thing for the RAF...


ORIGINAL: Apollo11
Hi all,
ORIGINAL: Dixie
ORIGINAL: Apollo11
How is the visibility from the rear turret Martin?
IIRC the Lancaster rear gunners very often complained that visibility was poor (or perhaps this was due to high altitude flying and freezing of perplex)?
It's not too bad, the gunsights would be an added lump in the way of the vision I suppose. The gunners would either cut some of the perspex out or remove the whole sheet due to the thing either icing up or getting scratched. The side panels etc didn't matter too much as they would rarely keep the turret still for long. Taking out the perspex improved the view but at the cost of removing any potential of keeping warm in there. Ours has the hydraulics disabled so the only way to turn it is by rotating by hand. I'm not a big fan of only being held in by a pair of sliding doors though!
As sat in the turret with it locked facing rearwards your eyeline is 'above' most of the metal work in the turret as viewed directly rearwards. The view from 9 to 11 o'clock, and 1 to 3, is partly obscured by framework and gun mountings. There's a clear view directly out at 9 and 3 o'clock past the rudders.
There was an improved turret made by Rose Brothers which came along late in the war, it was much bigger and had better visibility as well as twin .50 cals instead of the Browning .303 guns of the Fraser Nash turrets. The gunner could also wear his parachute whilst sat in the turret instead of having to stow it outside so bailing out was a matter of just tumbling over the guns and into space.
![]()
RGR!
BTW, how high does your Lanc fly these days? Always low?
Leo "Apollo11"

ORIGINAL: Apollo11
Hi all,
ORIGINAL: Terminus
ORIGINAL: Dixie
You're probably thinking of the Monica system?
That's the one.
The "Monica" was almost totally unusable because it gave enormous number of "false alarms" due to proximity of other friendly bombers in the bomber stream... most Lancaster crews simply turned it OFF... [;)]
Leo "Apollo11"
P.S.
Germans also developed very successful passive radar receiver that homed on "Monica" signals - it was not good thing for the RAF...

ORIGINAL: AW1Steve
ORIGINAL: Apollo11
Hi all,
ORIGINAL: Terminus
That's the one.
The "Monica" was almost totally unusable because it gave enormous number of "false alarms" due to proximity of other friendly bombers in the bomber stream... most Lancaster crews simply turned it OFF... [;)]
Leo "Apollo11"
P.S.
Germans also developed very successful passive radar receiver that homed on "Monica" signals - it was not good thing for the RAF...
I guess it's payback for how the Brit's exploited the Metox system that German U-boats used. Same deal , a ESM system that emitted a frequency that the coastal command RAF bombers could home in on.

ORIGINAL: Chickenboy
ORIGINAL: AW1Steve
ORIGINAL: Apollo11
Hi all,
The "Monica" was almost totally unusable because it gave enormous number of "false alarms" due to proximity of other friendly bombers in the bomber stream... most Lancaster crews simply turned it OFF... [;)]
Leo "Apollo11"
P.S.
Germans also developed very successful passive radar receiver that homed on "Monica" signals - it was not good thing for the RAF...
I guess it's payback for how the Brit's exploited the Metox system that German U-boats used. Same deal , a ESM system that emitted a frequency that the coastal command RAF bombers could home in on.
Hi Steve,
I don't think that the Brits had any sort of passive homing apparatus to guide to Metox emissions. Certainly they perfected Huff-Duff and used that to bang-up (rimshot) effect, but Metox? I'm not so sure. Metox was marginally useful for the Germans, but they still had trouble until the end in identifying airborne ASW centimetric radar emissions. That was their greatest weakness. Not that Metox betrayed them, but just wasn't up to the task.
Well, that combined with suicidal "surface and engage" orders for dealing with airborne threats, nonsensical daily radio positional call ins that could be fixed and located, faulty torpedoes, poor range in their VIIc, 'war against the type XIV tankers', etc. etc.

ORIGINAL: Dixie
ORIGINAL: Chickenboy
ORIGINAL: AW1Steve
I guess it's payback for how the Brit's exploited the Metox system that German U-boats used. Same deal , a ESM system that emitted a frequency that the coastal command RAF bombers could home in on.
Hi Steve,
I don't think that the Brits had any sort of passive homing apparatus to guide to Metox emissions. Certainly they perfected Huff-Duff and used that to bang-up (rimshot) effect, but Metox? I'm not so sure. Metox was marginally useful for the Germans, but they still had trouble until the end in identifying airborne ASW centimetric radar emissions. That was their greatest weakness. Not that Metox betrayed them, but just wasn't up to the task.
Well, that combined with suicidal "surface and engage" orders for dealing with airborne threats, nonsensical daily radio positional call ins that could be fixed and located, faulty torpedoes, poor range in their VIIc, 'war against the type XIV tankers', etc. etc.
I may be mistaken, but iirc the Brits couldn't actually detect Metox it was a ruse to disguise the efficiency of the latest radar. It was a fabricated story that was passed on to the Germans by a downed Coastal Command airman. The Germans were already suspicious that something was leading the aeroplanes to them in the darkness or bad weather and the lie about Metox convinced them to stop using it, thus giving them even less notice of an incoming attack. Any boat that didn't make it back wouldn't have been able to report they weren't using their Metox.


ORIGINAL: Chickenboy
Hi Steve,
I'm finishing up the second volume of Clair's "Hitler's U-boat War". It's an 800 page slog, but interesting. He reviews the Metox usage and German's beliefs that they were being detected, whereas in reality, they were not. The second volume was written in this decade, IIRC.
I'm comfortable with his research on the matter and the conclusions that he draws from that, but I'm open to an even better countervailing opinion, if one exists.