theWacoKid
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Posts posted by theWacoKid
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12 minutes ago, Whoops! said:
Let’s talk about all the factors you’re not taking into account.
1. The forces in the other 300 degree of barrel where the holes do not exist.
2. That it still isn’t zero Pressure where the holes exist and that the low pressure area outside of the barrel will help pull more pressure from inside the barrel the entire time the bullet is exiting the barrel; as well as the bullet forcing more pressure out of those holes by blocking the frontal path of the burn.
3. That while that pressure is pulled, it is acting on additional barrel surface area created by the holes made through the barrel.
That additional surface area, as well as the other factors mentioned, applies additional force on the barrel and firearm to counteract the recoil made by the bullet being forced forward out of the barrel.The reason we’re having this conversation is to see if and why popple holes work. It isn’t an easy explanation. We’re not going to get the best results by randomly drilling or edming holes in barrels.
So far, Schuemann has had the best popple design with his rocket nozzle style holes in the hybricomp barrels.
I would like to see someone put similarly effective holes in a “V” configuration with a super light weight slide and a titanium reverse gill comp (similar to Akai’s design) because Science, not conjecture, dictates that would be the best design.
And yes, there truly is only one best design.
Imbalanced vertical forces absolutely counteract motion of the gun. Nobody says it doesn't. Balanced lateral forces do nothing to stabilize the gun, nor do they counteract other imbalances of lateral forces applied to the gun.
There's physics, there's marketing, and there's intuition and they all aren't the same.
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10 hours ago, Whoops! said:
Your equation is too simple. You need rocket science / aeronautical engineering principles.Rocket science and aerospace engineering derive all principles from physics. It's not too simple if it's correct.
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19 hours ago, Whoops! said:
Oh, and also, for horizontal return (the dot moving straight up and down every shot), the holes need to be pointed more to the sides than to the top. For vertical return (less movement up), they need to point to the top.
For me and for a lot of other people, that horizontal return is more beneficial than the vertical return. Again, why I prefer the v12 instead of, as an example, the vertical holes on most 2011s.
Also cool about the horizontal return - you can’t over compensate. As long as the holes are balanced, your dot will just track straighter and straighter.
Last I checked x lbf pushing to the right and x lbf pushing to the left is zero lbf of externally applied load. Unless physics has changed lately and fbd's no longer work.
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10 hours ago, tag129 said:
Hi All,
What’s the benefits of having a double side scope mount? Is it worth switching over from single side to dbl side mount?
Any advices would be appreciated.
Double sided is a stiffer system. Can take out some dot wiggle and "explosion" from mount vibration. Some care, some don't.
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On 12/30/2019 at 10:57 AM, gianmarko said:
my friend's Nikko Stirling MRD failed. it is almost new, maybe 4-5000 rounds, and bracked mounted of top of an open gun
as expected, it is identical to the "made in japan" TSX6 and to the CMore RTS2
this failure is nothing short of shameful. the resistor that drives the led just detached from the PCB. see picture.
easy to fix, but this should not happen. quality is just crap.
You mind measuring that resistor while it's off?
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On 12/21/2019 at 10:58 PM, tomjerry1 said:
My Caspian with a Caspian extractor will run 38S and SC without issues. I have never tried 9mm? Seems to me, that the shorter case on a 9mm would not headspace correctly?
Headspaces off extractor.
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Have the fastest total time at every match.
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1 hour ago, Specialneeds said:
Ok, is this slide length?.. barrel length?
Barrel length isn't relevant in this case. A fullsize gun does not cease to be a fullsize gun because you add a compensator. It's now just a fullsize gun with a compensator.
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2 hours ago, Specialneeds said:
Also, what is the differences in these "shorty" and "middy" guns?
Not only this but.. why would someone go to the ends of using aluminum shock buffers for reducing total slide travel after the gun was purposely increased in total slide travel?
Thank you.
Specialneeds
Shorty is basically commander length (3/4" shortened from full size).
Midsize is full size shortened 1/2".
Destroking is just something you have to try and another tuning tool.
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40 minutes ago, Ming the Merciless said:
Magnetism? Are you picking up the nas3 cases with a magnet?
I'm not, but they are magnetic. Don't see how that will play into this mystery.
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16 hours ago, DD78 said:
Reading that people have removed material from a $650 steel grip to fit a $125 magwell from another company makes me shake my head.
They're all just tools, do whatever makes it work better.
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1 hour ago, Specialneeds said:
Man, I would personally spend the bucks and run 38super/9x23 with starline brass. All that noise.. seems like a lot could go wrong with a bimetal case.
"Seems like" is not objective. Engineering analysis is.
19 hours ago, Darthrader18 said:I've searched and talked to a few people and can't figure out a reason for this issue. so occasionally with multiple 140s and 170s the round will chamber but the extractor will not be over the rim of the case, so the gun is out of battery.
Brandon, I think for this to happen there has to be non-controlled feeding. What I mean is the round is being released from the mag before it has come under control by the extractor. Probably can be fixed by some combination of playing with the mag lips, adjusting the height of the mag in the gun, and/or increasing the distance between the extractor hook and the breech face. Not sure why these cases seem to be the culprit, but there's always a reason.
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Locally I'm seeing reduced failure rate so far. Rumor is this is true globally as well. Still not bullet proof, but better.
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1 minute ago, lstange said:
If you scroll up, there is a chart that shows only 95%+ classifiers, too. With similar slope of the regression line.
Putting actual hit factor on X axis will not tell you anything you don't already know. Points are in the numerator of the hit factor formula, so I'm pretty sure that there'll be strong positive correlation.
But the question wasn't whether shooting alphas is good. The question was whether it makes sense to accept more charlies on harder targets. I'm too lazy to calculate angular size of all targets on all 78 active classifiers and think about how no-shoots affect point of aim, so I cut the corner and used HHF as a proxy instead. You can look at this data and draw your own conclusions.
95% plus classifiers still don't tell you WHICH scores are actually better. Speaking of that plot, what classifiers are the ones with 95% runs with <80% points? That seems worth investigating.
Hit factor will tell you what you need to know because it takes into account the critical counterbalance to points.
The typical wisdom is the lower hit factor the stage the more penal the dropped points and this is true.
My conclusion is your plot demonstrates higher hit factor classifiers typically have more forgiving targets. And as a general rule, this is true
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5 hours ago, lstange said:
The red regression line is fit to the data represented by blue dots. Independent variable is HHF, dependent variable is percent of points shot, observations (blue dots) are actual classifier results. The line is drawn in such a way as to minimize the sum of squares of residuals (vertical distances between the red line and blue dots).
Positive slope of the red regression line suggests that on average people shoot better points on fast (high HHF) classifiers, in line with my intuition. Even if you only look at GM-level results or results from GMs. To me it makes intuitive sense to accept more Charlies on distant targets, and both charts seem to tell the same story.
The charts may look noisy, but there is enough data to get a pretty low p value, indicating statistical significance. One can argue that the effect size is small and has little practical significance, but it still exists.
If you have a mix of close up and distant targets, you really don't want Charlies on the close targets. But that would be a different, more complicated story. Right now we're just looking at the main effect.
You have the baseline high hit factor of some classifiers on the x-axis, you have percent of points shot on the y-axis, and you have plotted runs by shooters classified as GM? Yet at no point have you considered the actual hit factor shot by the shooters, just the percent of available points they shot?
If anything, you should look at the relationship of percent of points shot to the actual hit factor shot. That's all that matters. The higher HF classifiers will typically have easier targets, which will result in better points being shot on the whole, but you have no idea if those "better points" runs actually resulted in "better scores".
I don't care what some random GM shot, I care what the guy with the best hit factor shot. I'd venture a wild guess to stoke the fire that if the x-axis was actual hit factor shot the regression line would slope the other way.
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1 hour ago, Tcotter2629 said:
Are mbx mags ipsc legal
MBX has IPSC legal pads for their mags.
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10 hours ago, Tcotter2629 said:
Is their a difference in mags you have to use for open in IPSC?
170mm firm in IPSC.
171.25mm max in USPSA.
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17 lbf ISMI main spring with 0-3 coils cut off.
7 lbf Wolff recoil spring with 5-13 coils cut off.
Everybody likes something different.
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On 11/13/2019 at 6:47 PM, RadarTech said:
This is pretty straight forward..
Is there evidence of a crown or a grease ring?
Can you put an overlay on it and see that it actually have a radius of the bullet size?
I've seen a drop turner cut almost in half, and it was obvious he shot it..
The other obvious thing to consider is stage design, to prevent this.
This year at an area match there was a target 4 feet away that could be shot within the 180 and would have yielded this.. but we blocked it with a no shoot...
BUT lacking that- it should be obvious and have an indication it was not splatter or ricochet.
No, no, no. A scoring hit does not require a crown, grease ring, or radius. Those are items you MAY use if there is some reason to believe something OTHER THAN the bullet made the hole. If the bullet made the hole and completely penetrated the target from the scoring side, it scores. Period.
On 11/13/2019 at 6:35 PM, mchapman said:My question is if you have a shooter engage and hit a target from an extreme angle, and it creates an enlarged hole, does 9.5.5 apply? An example is shooting a 9mm and the hole is 9mm X 1 1/2 inch long. I am thinking that 9.5.5 will not apply since the shot is not a ricochet or splatter. Others thoughts?
No need for 9.5.5, because 9.4.1 and 9.5.9 should suffice. No need for 9.5.5 until you have a presumption something else may have made the hole.
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22 hours ago, pjb45 said:
It's an SV grip for non-SV frame.
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Regular sear springs tend to sit low in SV grips and mixed with the right frame or sear problems like this occur.
With the grip safety out, visually inspect how low the sear spring leg touches the sear. That's probably what you need to fix.
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Wording matters. By your wording, no penalties.
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2 hours ago, Yargne said:
Rule 6.2.5.1 moves a competitor to open if they fail equipment requirement. When an open competitor fails they shot for no score. I would suggest they be placed in PCC and scored minor. Since the division with least restrictions is PCC, why not have the penalty for failing equipment to be being placed into PCC instead of open?
You get moved to open because you have de facto showed up with open equipment. It's not a penalty, it's where you belong according to division rules. Failing open requirements means you now fit no division, not even PCC. No need to even consider messing with this, it's already done right.
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MaxTime is the time needed to match the high hit factor on the stage while shooting all A's.
For the values associated with hits/penalties that is the amount of time improvement from MaxTime for each of those hits/penalties that would be needed in order to maintain a score equal to the current high hit factor.
Issues with hammer not dropping
in Open Pistols
Posted
It's possible that something other than your over travel screw is stopping the trigger's rearward travel. Seen this before. You know how to check that there is sufficient over travel?