Bill Calfee
Gun Fool
Accident or on purpose?
CYA friends:
Momentum dependent, PAS ignition is one of the reasons that the level of RFBR accuracy is where it's at today.
Did Flash Ebert design the momentum dependency of his Turbo's PAS ignition on purpose, or by accident?
At this point does it really matter?
No, not really, but, it's always interesting to know just how things came about.
Flash did design his Turbo based on the 52 Winchester..........this I did discuss with him.
But, if you take a 52 Winchester, and decide you wanted to use a Remington pattern trigger, and start to engineer it, about the only way it could be done, is like Flash wound up doing it.
Since the Remington pattern trigger couples to the cocking piece, at the rear of the action, as opposed to the original "Micro Motion" trigger of the 52 Winchester that couples the trigger sear to the firing pin mid-rift, the enlarged firing pin head, which contains the angled cocking piece, had to have a purchase place.
So, about the only practical way the PAS firing pin head, of the Winchester firing pin, could be modified to function with the Remington pattern trigger, was the way Flash did it.
___________________________
So, did Flash intentionally go about adding momentum dependency?
No, I doubt it...........
In this case, it was a matter of form following function.
____________________________
Oh, before I forget it.........
I meant to say something about my D's case head penetration in my last movie, but, I'm so limited by time in my little movies...
My old 52 Winchester D, when I added my little momentum weight head to the firing pin, increased my average zero readings in my penetration tests.
That little weight head ,and my D, are the easiest example that I know, to demonstrate the value of momentum dependency.
It's a simple matter to run a 10 round penetration test, without the little weight head, then, screw it on and run a second test.
And compare the two............
You know, you'd think that any rimfire action maker would simply run a similar test, before deciding on a design for their action's ignition system, but, by running such a test, one might discover something one wouldn't particularly want to know................
Us human beings are kinda interesting................sometimes we'd just rather not know............
_______________________________
Anyway, here's something that's kinda interesting, as related to running the above penetration tests:
When I use the weight head on my D pin, I also use a different rate firing pin spring................but..
I've found, that it matters not, for the results of the test, whether I'm using the spring for the naked pin or the spring for the momentum pin, the uniformity of penetration increases either way...........
The only issue there is, is this; when I use the momentum spring, it overdrives the naked firing pin slightly.....
My firing-pin-to-mechanical-stop-measurement is too close, small, when the momentum spring is used in the naked pin.
___________________________________
So, whether Flash designed his momentum dependence on purpose, or, as probably happened, by design following function, it worked, big time!
Your friend, Bill Calfee
Here's some pictures of my little momentum 52 Winchester.
By the way, Flash is holding the 2012, ARA National Championship, Turbo actioned rifle in his lap, in this picture.
By the way, was Flash proud of the accomplishments of his actions? Oh yes......
CYA friends:
Momentum dependent, PAS ignition is one of the reasons that the level of RFBR accuracy is where it's at today.
Did Flash Ebert design the momentum dependency of his Turbo's PAS ignition on purpose, or by accident?
At this point does it really matter?
No, not really, but, it's always interesting to know just how things came about.
Flash did design his Turbo based on the 52 Winchester..........this I did discuss with him.
But, if you take a 52 Winchester, and decide you wanted to use a Remington pattern trigger, and start to engineer it, about the only way it could be done, is like Flash wound up doing it.
Since the Remington pattern trigger couples to the cocking piece, at the rear of the action, as opposed to the original "Micro Motion" trigger of the 52 Winchester that couples the trigger sear to the firing pin mid-rift, the enlarged firing pin head, which contains the angled cocking piece, had to have a purchase place.
So, about the only practical way the PAS firing pin head, of the Winchester firing pin, could be modified to function with the Remington pattern trigger, was the way Flash did it.
___________________________
So, did Flash intentionally go about adding momentum dependency?
No, I doubt it...........
In this case, it was a matter of form following function.
____________________________
Oh, before I forget it.........
I meant to say something about my D's case head penetration in my last movie, but, I'm so limited by time in my little movies...
My old 52 Winchester D, when I added my little momentum weight head to the firing pin, increased my average zero readings in my penetration tests.
That little weight head ,and my D, are the easiest example that I know, to demonstrate the value of momentum dependency.
It's a simple matter to run a 10 round penetration test, without the little weight head, then, screw it on and run a second test.
And compare the two............
You know, you'd think that any rimfire action maker would simply run a similar test, before deciding on a design for their action's ignition system, but, by running such a test, one might discover something one wouldn't particularly want to know................
Us human beings are kinda interesting................sometimes we'd just rather not know............
_______________________________
Anyway, here's something that's kinda interesting, as related to running the above penetration tests:
When I use the weight head on my D pin, I also use a different rate firing pin spring................but..
I've found, that it matters not, for the results of the test, whether I'm using the spring for the naked pin or the spring for the momentum pin, the uniformity of penetration increases either way...........
The only issue there is, is this; when I use the momentum spring, it overdrives the naked firing pin slightly.....
My firing-pin-to-mechanical-stop-measurement is too close, small, when the momentum spring is used in the naked pin.
___________________________________
So, whether Flash designed his momentum dependence on purpose, or, as probably happened, by design following function, it worked, big time!
Your friend, Bill Calfee
Here's some pictures of my little momentum 52 Winchester.
By the way, Flash is holding the 2012, ARA National Championship, Turbo actioned rifle in his lap, in this picture.
By the way, was Flash proud of the accomplishments of his actions? Oh yes......
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