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11-22-2018, 05:20 PM | #1 |
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"Mavka" pistonless speargun prototypes
On the “Vlanik” pistonless gun thread there was an image of two guns that looked very attractive and a search has discovered them on the www.akvalang.com website. The top gun is a 70 cm model and the lower gun is a 55 cm model. The 70 cm gun has a side-mounted line release while the 50 cm gun has a passive magnetic clip similar to the Pelengas release lever.
https://forums.deeperblue.com/thread...n.90450/page-5 https://forums.deeperblue.com/thread...t53023&slide=0 https://www.akvalang.com/forum/topic...shnevoe-ruzhe/ Roman (Adept6) has described the guns there, but unless you are a member you cannot see the photos and so I am reposting some of them here. The guns were created by Roman who also did the “Arma” speargun, hence the similarity in the style of the grip handles. https://forums.deeperblue.com/thread...2/#post-959969 Here are photos of the muzzle and spears used with the guns. The grip handle and barrel which has an integral shroud incorporated for buoyancy on a 22 mm diameter tank tube. Note that the trigger pivot pin is in the lower trigger finger guard frame. The plastic trigger operates the sear lever arm in the muzzle, which is basically a single piece trigger, via a slim pull rod that runs under the tank tube to the muzzle. Note the step in the front of the spears for the sear tooth (which is of a cam type) to engage rather than an annular notch. The longer 70 cm gun floats after the shot, the shorter 50 cm gun is a slight sinker. A side-mounted line release is incorporated in the former gun, the latter uses a passive magnet line clip located just behind the grip handle. Last edited by popgun pete; 11-22-2018 at 06:09 PM. Reason: more info |
11-22-2018, 05:53 PM | #2 |
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Re: "Mavka" pistonless speargun prototypes
Pistonless pneumatic spearguns are very efficient as the guns only have one seal in the muzzle which the spear shaft slides through. The spear in a sense is also the inner barrel and piston in one item. Hence this gun has the equivalent of an 8 mm diameter inner barrel and as the spear cannot have any notches in it that penetrate into the gun the retention notch is at the front of the spear.
Usually forward latching speargun have an annular notch that weakens the spear, but here the shaft has a step with a slightly larger diameter "collar". In order to prevent air escaping from the gun with each shot a detachable spear tail cap or plug acts as a stopper in the muzzle. The sear lever is essentially a single piece trigger installed in the muzzle and operated via a thin pull rod running from grip handle to the muzzle under the tank tube, this being the most common arrangement on forward latching pneumatic spearguns which are very common in Russia and the Ukraine. One of most widely known pistonless spearguns is the "Vlanik" speargun which has undergone many revisions over the years and here are two of them. Not everyone likes the handles, so there are many derivatives and clones. A decade and more separates the models shown, the later gun being a floater after the shot whereas early guns are sinkers. The gun with the shoulder stock is a target shooting model, it was also available without the stock and the sights, but was still a sinker. Last edited by popgun pete; 11-22-2018 at 06:29 PM. Reason: more info |
11-25-2018, 02:53 AM | #3 |
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Re: "Mavka" pistonless speargun prototypes
More information on the "Mavka" pistonless speargun can be found here.
http://garpun.spb.ru/forum/viewtopic.php?t=1147 First image The 70 cm "Mavka" gun with reel fitted (Pelengas) Second image "Mavka" trigger pull rod, bifurcated sear lever arm, trigger biasing spring and sear which is the cylindrical element with the cutout that releases the spear when rotated by pulling the trigger. Third image Mavka sear and muzzle lever.jpg This combined photo shows how the biasing spring is fitted onto the trigger pull rod. Last edited by popgun pete; 11-25-2018 at 05:53 PM. |
11-25-2018, 05:57 PM | #4 |
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Re: "Mavka" pistonless speargun prototypes
Muzzle details including line wrapping detail of muzzle front line hook. Image below shows inverted muzzle with detail of trigger pull rod connection to swinging sear lever arm which functions as a single piece trigger. Note the biasing spring which pushes the sear lever arm forwards after you have pulled and then released the trigger. From the comments on the Russian and Ukrainian forums it seems that you can insert the spear into the "Makva" gun without having to pull the trigger, something that often needs to be done on forward latching guns to ease the spear tail past the sear tooth.
Mavka gun pull rod biasing spring.jpg Line wraps on front line hook in lateral view of "Mavka" muzzle nose. Mavka gun line wraps.jpg Line wraps on cocked ready to shoot "Mavka" pistonless gun, note that the gun is shown inverted here. Mavka muzzle with spear.jpg |
11-25-2018, 09:22 PM | #5 |
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Re: "Mavka" pistonless speargun prototypes
Pistonless guns have the potential to swallow water, maybe only a tiny amount, if the water in the front cavity of the spear tail cap after the shot is not completely squeezed out when the tang of the shaft is pushed into it during reloading of the spear shaft. Properly machined the spear tail cap will butt smoothly with the shaft body so that the join in the shaft that passes through the muzzle seal will not break the seal or have any water inside the almost microscopic gap, but there may be some water in the cavity as butting two surfaces with absolutely no gaps is very difficult both internally and externally, it will usually be one or the other. If the water is in the tail cap cavity then it is important that it stays there and that the cap does not fall off inside the gun.
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11-25-2018, 09:59 PM | #6 |
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Re: "Mavka" pistonless speargun prototypes
This diagram shows how the "Mavka" gun works if you study it closely.
Last edited by popgun pete; 11-25-2018 at 10:08 PM. |
11-26-2018, 01:12 AM | #7 |
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Re: "Mavka" pistonless speargun prototypes
This is what the "Vlanik" spearguns were like some years ago and were sinkers due to their heavy handles, particularly as floating after the shot spearguns were then not a priority.
Last edited by popgun pete; 11-26-2018 at 01:25 AM. |
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