AVU nose and tail bomb fuze, Russia

[microplastic]

cutaway model of a russian AVU bomb fuze. The fuze is mechanical activated and can be used as nose or/and tail fuze. This fuze is intended for aircrafts that do not have electrical starting device. The fuze is used with high-explosive (FAB), high-explosive fragmentation (OFAB), high-explosive incendiary and incendiary air-bombs. The fuze provides point detonating and inertia action, ignition SQ and two delay modes.

Edit: Last picture shows the AVU-ET fuze, that has the same functions but is electro-pyrotechnically armed.

 

[SpecificEdge]

@microplastic Could you tell me what the thread is on that fuze, where it threads into the bomb fuze well? I'm working on a replica and can't find good info. I think it's a 52mm, but what's the pitch?

Thanks, very nice work on this and the AVB-E.

 

[microplastic]

i only have this poor pic, there is written: Spec 1M51.95x3f. Could be M52x3, f means fine thread i think...

 

[SpecificEdge]

i only have this poor pic, there is written: Spec 1M51.95x3f. Could be M52x3, f means fine thread i think...

Thanks, 3mm would make sense. Many of the artillery fuzes use M38x2.5.

 

[Eggburt1969]

@microplastic Could you tell me what the thread is on that fuze, where it threads into the bomb fuze well? I'm working on a replica and can't find good info. I think it's a 52mm, but what's the pitch?

It's M51.96×3 according to a Russian manual on the AVU series and other bomb fuzes. The official AVU-ET manual also states M51.96×3, well M51.96×3f.

 

[MRoy]

Thank you for this rare and interesting cutaway,

do you know of any differences in the internal operation of the various AVU, AVU-E, AVU-ET and AVU-ETM models?
It seems to me that only the arming and operating times differ, but that the overall operation remains the same.

 

[microplastic]

but that the overall operation remains the same.

I think so. The Main difference is the arming device.

AVU: mechanical only
AVU-E: electrical only
AVU-ET : electrical only
AVU-ETM: mechanical and electrical

if i am correct...

 

[MRoy]

Thank you very much for this reply, which has finally given me a better understanding of a question I've been asking myself for a while.