Beethoven
November 18, 2005, 03:37 PM
As titled.
What factors, parts, etc. determine an automatic weapon's cyclic rate?
What factors, parts, etc. determine an automatic weapon's cyclic rate?
What determines the cyclic rate of an automatic firearm?
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jsalcedo
November 18, 2005, 03:38 PM
Weight of the bolt is one factor.
P95Carry
November 18, 2005, 03:48 PM
I daresay bolt mass, travel and recoil system are major determining factors.
Bolt mass would have to be a compromize where mass sufficient, with return spring strength to reliably chamber a round into battery but not so light that this function prejudiced.
Feed method also will play a part - re belt-fed, magazine fed etc. I'd reckon that short pistol rounds like 9mm will tend to have higher rate potential because of less need for a long bolt travel - whereas something like M60 with bottleneck rifle cases being longer - there'll be a longer delay between firings as bolt travel distance increased.
The final speed will be a result of ''sum of parts'' - all moving parts taken into account with their respective masses and motions. Hopefully someone will drop by with some specifics.
Bolt mass would have to be a compromize where mass sufficient, with return spring strength to reliably chamber a round into battery but not so light that this function prejudiced.
Feed method also will play a part - re belt-fed, magazine fed etc. I'd reckon that short pistol rounds like 9mm will tend to have higher rate potential because of less need for a long bolt travel - whereas something like M60 with bottleneck rifle cases being longer - there'll be a longer delay between firings as bolt travel distance increased.
The final speed will be a result of ''sum of parts'' - all moving parts taken into account with their respective masses and motions. Hopefully someone will drop by with some specifics.
Ukraine Train
November 18, 2005, 04:01 PM
I could probably whip out my Dynamic Systems notes and bore you (and confuse myself in the process lol) but the mass of the bolt, friction, and spring strength will affect the rate. A well oiled, light bolt will have less inertia and friction. Combined with a stiff spring it'll move pretty quick. But then if your spring is too stiff you'll have feeding problems.
Rob1035
November 18, 2005, 04:38 PM
wouldn't operating system (blowback, gas, etc etc) be another factor?
AZ Jeff
November 18, 2005, 04:53 PM
Factors that control cyclic rate:
1. gas system impulse delivered to bolt carrier (this, in turn, is a function of gas port size, port pressure, piston size, etc.)
2. mass of reciprocating parts (carrier/bolt/recoil spring system)
3. distance of travel from full locked breach to fully recoil position
4. frictional forces of slide bolt/carrier assy
5. stripping forces of cartridges from magazine (this, in turn is a function of magazine design & cartridge shape)
6. cocking forces of hammer/striker
7. lock time
8. recoil spring forces
In short, it's a complicated set of variables, but the biggest ones are 1, 2 and 3 above.
1. gas system impulse delivered to bolt carrier (this, in turn, is a function of gas port size, port pressure, piston size, etc.)
2. mass of reciprocating parts (carrier/bolt/recoil spring system)
3. distance of travel from full locked breach to fully recoil position
4. frictional forces of slide bolt/carrier assy
5. stripping forces of cartridges from magazine (this, in turn is a function of magazine design & cartridge shape)
6. cocking forces of hammer/striker
7. lock time
8. recoil spring forces
In short, it's a complicated set of variables, but the biggest ones are 1, 2 and 3 above.
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