MK IV Projo Fuze

[jvollenberg]

Here is a MK IV US Projo fuze. This is just the head, and is missing all of the internal components. I like the markings on this one since they are so clear.

Does anyone know what the B-D M.C stands for?

Joe

 

[TimG]

Joe,

Why the left hand thread at the base of the fuze?

TimG

 

[jvollenberg]

For the booster that is missing.

Joe

 

[TimG]

Joe,

I wasn't questioning it's presence, but it's direction. Due to the rotation of the projectile anything screwed onto that thread is likely to unscrew. Left hand threads are normally utilised for projectile base fitments; base fuze, tracer units.

TimG

 

[Alpini]

Hi Tim,

exactly this is the reason - think twice about it If it is right hand thread the booster would unscrew if it isn't secured with a set screw or caulking* (how it was done on the original French fuze). The booster is on the bottom side so it's the same principle like for a base fuze.

Regards, Alpini

*not sure if "caulking" is the right word?

 

[jvollenberg]

Ahh ... sorry didn't think about the question. I would agree with Alpini on this.

Joe

 

[TimG]

Alpini,

You're quite correct. Schoolboy error, I wasn't thinking and allowed 'practice' to overrule 'physics.'

TimG