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03-30-2020, 02:43 PM | #61 | |
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Re: Made a 145cm inverter, 10mm shaft
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03-30-2020, 04:31 PM | #62 |
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Re: Made a 145cm inverter, 10mm shaft
All spearguns create a couple trying to twist gun up around your hand.
Last edited by popgun pete; 03-30-2020 at 05:20 PM. Reason: added another diagram |
03-30-2020, 07:26 PM | #63 | |
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Re: Made a 145cm inverter, 10mm shaft
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Thanks for the video. I love my invert guns, their low recoil, and accuracy. Holy cow though on 10mm shafts. |
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03-31-2020, 02:20 AM | #64 | |
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Re: Made a 145cm inverter, 10mm shaft
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One thing to note ... thinning out the backside to elevate the handle really weakens that area as there is much less wood. So I highly recommend that the back area and trigger pocket be reinforced with Carbon Fiber. This stiffens the weaker area and doesn't allow flexing. Flexing can cause shaft instability which is of course detrimental in many cases. You can of course put CF between the laminates, but I think that the entire back area should be reinforced including the trigger pocket. I have made a 3D printed shape that allows you to perfectly mold the space for the trigger and allow all moving parts to move fully ... even allows for .3mm CF layer ... this allows you to put CF inside the pocket and press this part in and have a perfect strong inner pocket which can then be mated with the outer CF body. It also has perfect shaft to trigger height alignment to make things easier and quicker. There is no question that a gun with stiffened back end shoots much more accurately than one that is not stiffened. I will see if I can put this 3D file out on Mario's website so anyone can 3D print it and use it. With this you can modify any gun trigger in minutes ... something that used to take me hours or even days. |
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03-31-2020, 07:50 AM | #65 | |
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Re: Made a 145cm inverter, 10mm shaft
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https://youtu.be/quK3KmCIIwc Last edited by Satdiver; 03-31-2020 at 01:01 PM. |
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03-31-2020, 08:09 AM | #66 |
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Re: Made a 145cm inverter, 10mm shaft
These shots look OK.
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03-31-2020, 10:31 AM | #67 | |
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Re: Made a 145cm inverter, 10mm shaft
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I do have a basic shop where I wrench, make some wood guns, weld, etc... but that's a whole different thing! Mikel |
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03-31-2020, 10:35 AM | #68 | |
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Re: Made a 145cm inverter, 10mm shaft
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Theses test was done with a blank 9.5mm test shaft with 2.2mm mono. The last test in the video was 1.6mm stainless cable on the test shaft. The reason I start with a blank shaft is to see how accurate the gun shoots, then I then move onto 1.6mm stainless shooting cable, then to a 10mm double offset flopper shaft then to slip-tip shafts. Step by step. https://youtu.be/eFGpL95v6R0 Last edited by Satdiver; 03-31-2020 at 10:56 AM. |
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03-31-2020, 10:40 AM | #69 |
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Re: Made a 145cm inverter, 10mm shaft
Hi Pete, You can see the 10mm shaft flexing as it leaves the gun. But the shaft flight is quite flat.
Last edited by Satdiver; 03-31-2020 at 10:55 AM. |
03-31-2020, 10:53 AM | #70 | |
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Re: Made a 145cm inverter, 10mm shaft
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The tigger template look great. That would save so much time in installing a trigger and could get the trigger housing perfect. Would be good to have one just for the trigger housing and another with the trigger housing and the track depth. Would you sell them? Last edited by Satdiver; 03-31-2020 at 01:00 PM. |
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03-31-2020, 02:40 PM | #71 | |
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Re: Made a 145cm inverter, 10mm shaft
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Last edited by popgun pete; 03-31-2020 at 02:59 PM. |
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03-31-2020, 02:45 PM | #72 | |
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Re: Made a 145cm inverter, 10mm shaft
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03-31-2020, 03:14 PM | #73 |
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Re: Made a 145cm inverter, 10mm shaft
Here are the images combined with a white line through the shaft and a red line through the gun. A flick comparator is a handy way to look for movement, unlike this image, but it allows measurements of angular movement such as the muzzle lifting which rotates the whole gun around your hand. The spear being freed at the tail is not being revolved as the gun body is, hence its angle is not changed much from just before the release of the tail.
In the second image I drew a measuring gauge using the top of the frame and then advanced it up with the cursor arrow to the top of the upper frame, note the shaft alignment has barely changed. This analysis confirms that the shaft stays on course even if the gun rotates on your hand with recoil and still hits the target. However too much recoil with a light body gun then the gun rotates before the shaft clears the end of the gun which results in the spear tail being clipped upwards sending the shaft off course. In closed track guns the lifting muzzle will bust the end of the track unless the shaft can blast clear before any appreciable movement of the stock. Huge ballasted multi-band guns, often referred to as tree trunks or logs, have so much inertia that they can spit a shaft out of a fully enclosed track because the shaft mass is eclipsed by the mass of the gun. Often these monsters just need an outboard motor fitted to make them self-propelled guns (Main Battle Tank, see below)! Last edited by popgun pete; 03-31-2020 at 09:09 PM. Reason: extra comment, added similar diag. for gun body movement |
04-01-2020, 01:54 AM | #74 |
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Re: Made a 145cm inverter, 10mm shaft
Pete, is the gun rotating around the Hand, or is the hand being pushed down?
Majd, nice tool.
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04-01-2020, 02:34 AM | #75 | |
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Re: Made a 145cm inverter, 10mm shaft
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I use to think it was just the shafting lifting. But from your findings, I can now see with the recoil of the gun and the handle dropping is coursing the shaft gap between the rear of the shaft and the gun body as the shaft leaves the mechanism. It begs the question, does a powerful gun need a track? I remember Jon saying about handle dropping in a earlier post. Also Majd saying that a good & fitting high handle helps with accuracy. You have highlighted this with your findings. I can also understand from your findings. The large diameter bands which weigh 1.1kg on this gun, plus the mass of the gun and a good fitting & high handle, reduces recoil and improve accuracy for inverter spearguns. Also need a very fast shaft speed, so the shaft has left the front of the gun before there to much muzzle lift. You have answered the question about enclosed tracks with your findings, enclosed track would be quite a problem with the recoil and course quite a accuracy problem with all inverter, roller and classic guns. You have now made me think how to make a better video for testing and to learn more about how the guns preform's. I'm thinking a better camera and a back ground with lines. That is one monster gun, I'm sure there would be some crazy recoil. Last edited by Satdiver; 04-01-2020 at 07:00 AM. |
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