Speed

[cary m2a]

Just for fun
Does anyone know the average speed of an M1 oprod using M2 Ball ammo?



Cary

Information

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[Mark in Rochester]

a quick calculation if you use the cyclic rate of a t31 which is approximately600 rounds per minute - or 10 rounds a second - oprod travel is 8.66 inches per cycle - so the rate is 86.6 inches a second which = 5 miles per hour

very rough calculation

[Stevo]

Just for fun
Does anyone know the average speed of an M1 oprod using M2 Ball ammo?



Cary

Laden or unladen?

[cary m2a]

Start with full en bloc of 8. Laden.

Cary

[TomSudz]

Laden or unladen?

African or European?

[Rob Mitch]

Seems like I read sometime back about 26 feet per second.

[Mark in Rochester]

86.6 (inches per second) = 7.21666667 feet per second that was with a cyclic rate of 600 rounds per minute

M14 was 750 rounds per minute

26 fps is mighty fast be very intrested if you could find that spec published somewhere

[Rob Mitch]

86.6 (inches per second) = 7.21666667

26 fps is mighty fast be very intrested if you could find that spec published somewhere

I'll see if I can find that again. May take just aa little bit.
Rob

[Rob Mitch]

This is the only place I can find it for now. This may be the article I was thinking of.
http://www.scott-duff.com/oprods.htm
Mark I see where your figure is from but would there not be a little idle time at the end of the cycle therefore increasing the speed figure?
I'm no mathematician, this is just something I read.

It's about half way down the page.

[Mark in Rochester]

Ok Rob

That makes more sense "the maximum speed is under 26 feet per second"

I would expect the maximum speed would result in the pressure stroke of the op-rod and the return stroke would be less.

what I was trying to calculate was average

yes there would be a small idle time as the op-rod reverses direction - this would have the opposite effect - if the cycle time was longer there would be less cycles per minute or second

so lets say we have 8 cycles in 20 seconds

so back and forward is 8.66 inches each time so (8*8.66) 69.3 inches in 20
seconds

Now lets increase the time and say we have 8 cycles in 30 seconds 69.3 inches in 30 seconds. more time to travel the same distance.


think that is correct

I will see if I can find the springfield study