Friday 2010-09-24 Dev. update and Discussion

[Splitter]

Didn't feel like editing the previous post....

Rate of fire and length of time firing matters too, even in a .50 cal.

A "cold bore" shot from an average barrel is going to have a different point of impact than a shot from a fouled, hot barrel. As the barrel heats up in an automatic weapon, the point of impact will continue to change.

Fire an automatic weapon in a long burst and you increase the chance of of a jam due to heat issues, mostly in the chamber. Barrels and chambers get REALLY hot, especially with higher velocity rounds.

I'm not sure these things can be modeled in a sim though. I can't remember having an machine gun jam without battle damage in IL-2 (maybe I am just lucky). I do know that in the old days of Secret Weapons of the Luftwaffe, firing a .50 cal in a turn pulling G's was rolling the dice as far as a jam went. My understanding was that earlier P-51 models had such problems due to the alignment of the MG's.

Splitter

[Skoshi Tiger]

Originally Posted by Splitter

Didn't feel like editing the previous post....

Rate of fire and length of time firing matters too, even in a .50 cal.

A "cold bore" shot from an average barrel is going to have a different point of impact than a shot from a fouled, hot barrel. As the barrel heats up in an automatic weapon, the point of impact will continue to change.

Splitter

Hi,

As you said there are large range of factors to take into concideration.

I've been trying to find some data for the exotic .303 rounds but it's a bit hard. You find info about the standard ball ammo. The MkVII (standard infantry round in WWII) and MKVIII (boat tailed round for vickers MG) is about 2440fps and the MkVIIZ comes in at 2550fps but I haven't found anything about the various forms of tracer, incendiary and AP rounds.

Tracers would be interesting as they would change mass as they burnt off their filling.

Cheers!

[Splitter]

Originally Posted by Skoshi Tiger

Hi,

As you said there are large range of factors to take into concideration.

I've been trying to find some data for the exotic .303 rounds but it's a bit hard. You find info about the standard ball ammo. The MkVII (standard infantry round in WWII) and MKVIII (boat tailed round for vickers MG) is about 2440fps and the MkVIIZ comes in at 2550fps but I haven't found anything about the various forms of tracer, incendiary and AP rounds.

Tracers would be interesting as they would change mass as they burnt off their filling.

Cheers!

I'll send some emails to some of my "ballistics" friends, but no promises as what you seek is outside of their normal realm of expertise (small arms). Ballistics is like statistics in my mind....what seems to make sense is not always fact. Their are strange factors that come into play and some exponential changes from round to round that most of us would not expect. (long range shooters have a "geekiness" all their own lol)."

I would think that the heat form the tracer would dissipate energy....but then again the round would be getting lighter. Does it have the same powder chard to begin with? The same grain weight? I have no idea.

Splitter