The DeeperBlue.net Gun Building Extravaganza - Gun Options 3 - Rail & Spear Diameter

[Pastor]

Originally Posted by spaghetti

How woulfd the section of the whole barrell+track ideally look like?

Very hurried mate, at work still

[spaghetti]

Originally Posted by Pastor

Very hurried mate, at work still

In GITS we trust
(..and in pastor too! have another sh...load of rep!)

[foxfish]

Originally Posted by Dobs

The only real downside I see in enclosed track will be the difficulty in finding spears with big sharkfins. There are not that many producers making 120-130cm-long 6.5mm shafts with big sharkfins. Actually I cannot remember a single one right now...

I have ordered a PICASSO SPEAR @130 CM for my gun, it has little pins not shark fins. Unfortunately I cant find an image & as it has not yet arrived I cant make any more comment.
Another issue would be the actual enclosed track as far as I am aware there are no commercial tracks available to suit a 6.5 spear, so that will be another custom component!

[Pastor]

Aside, I know that being able to partially hide the bands in the wide section of a cuttlefish type barrel with an enclosed track is potentially a compelling argument. There is nothing stopping us all thinking about reshaping that area to raise the sides enough to have the same affect with a regular track design.

[foxfish]

Da Na Da Na Da Naaa Batman!

[spaghetti]

Pastor the last pic for a barrel section turns me on to think of Batman (that's bat Ray's speargun!!!) sure, but also of this one.
It's a creation of forum member Persiko: this gun is named "audacious" and it has a really unique muzzle solution. I know the muzzle talk is not quite on topic by now, but I think this muzzle design could help with a barrell section like the one you designed in you previous post: the band makes a loop under the barrell through two holes...

[foxfish]

Persiko is one of the great gun builders & his designs are very well thought out.
I think that would indeed work with an enclosed track, of course there would no need to have the pin arrangement that holds the spear in place. The longer rubber would help power the gun too.

[Pastor]

Originally Posted by foxfish

Da Na Da Na Da Naaa Batman!

A gun for Batray perhaps

[blaiz]

Originally Posted by Dobs

The only real downside I see in enclosed track will be the difficulty in finding spears with big sharkfins. There are not that many producers making 120-130cm-long 6.5mm shafts with big sharkfins. Actually I cannot remember a single one right now...

Very legitimate concern however modifying a shaft and adding pins isnt all that hard. Well at least if you have access to a drill press or a friend with one. Which brings me to why I would be a perfect candidate to win this gun

[jtkwest]

Originally Posted by spaghetti

Pastor the last pic for a barrel section turns me on to think of Batman (that's bat Ray's speargun!!!) sure, but also of this one.
It's a creation of forum member Persiko: this gun is named "audacious" and it has a really unique muzzle solution. I know the muzzle talk is not quite on topic by now, but I think this muzzle design could help with a barrell section like the one you designed in you previous post: the band makes a loop under the barrell through two holes...

that is one of the most beautiful looking muzzle designs ever, the wood working is obviously top level, but only one band can be used with a design like this. maybe this would be feasible with a 20 or 23 mm band , but in the pic, the band looks much smaller. how do you get the power needed?if you were to put more bands, they would pile up, out of alignment,no? also, how do you install bands? they must be tied in place, no? seems inconvenient possibly

[blaiz]

Originally Posted by jtkwest

that is one of the most beautiful looking muzzle designs ever, the wood working is obviously top level, but only one band can be used with a design like this. maybe this would be feasible with a 20 or 23 mm band , but in the pic, the band looks much smaller. how do you get the power needed?if you were to put more bands, they would pile up, out of alignment,no? also, how do you install bands? they must be tied in place, no? seems inconvenient possibly

I dont think having a muzzle like this will be too inconvenient. Bands are easy enough to change. Also I saw a band made by hammerhead and the wishbone can actually be untied enabling you to take the bands off of a muzzle like this. Instead of tying one strand as your wish bone, they tie a shorty on either side of the band and then a longer piece is used as the actual wish bone. This piece is tied to either side usin some sort of slip knot.

As far as power, this is only a 90 and is going to have to be used at pretty close range, I personally dont think you will need the power of a 20 or 23mm band. again, only my opinion

[blaiz]

heres a pic of that band by hammerhead

[Oak]

I have no really relevant experience with closed track guns, but one of the things that occurs is whether the enclosed track will not be worse because dirt gets inside a lot. This could mean sand, algae and fish bits and pieces. IMHO it might be a pain to keep the gun in good condition. On the other hand, even if the shaft could be built as an open track, a track for the shaft could be strung on top of the main shaft.

Anyone else has had any bad experiences with encolsed spears?

Best,

[Vov]

[quote=foxfish;706104]Personally I think enclosed tracks are the business - they give a clear sight line, hold the spear in place even with the gun upside down, prevent any potential spear whip & look "super cool". Obviously a shark fin type spear would have to be used ...

[Sorry for joining so late, I prefer the 100 cm body length.]

Yeah, I think you're right! The closed track does it all... The loss of energy(=speed) due to friction can easily be overcome with a second band. My Picasso Century Passific Top 100 has 2 16 mm bands which provide plenty of power for a 6,5 mm x 150 cm shaft... They can be changed to 17 or even 18 mm, no need for more power, I believe. I've had no trouble loading/unloading on the sharkfins...
The closed track would give me the freedom to shoot at any position, ultimately upside down, which would probably be more fun than success.
Of course the best way is to give it a try on a stand and measure the ballistic/mechanic results, then try it at sea...
Good luck to everyone!

[Lockedin]

6.5 notched on a rail.

Not innovative, but certainly effective Sort of following the 1st thread of the Gun Extravaganza: A working man's gun. Though everything in the wood may be custom, parts such as shafts, should be easy to find and order, IMHO
Riffe has a couple of bolt-on kits that somewhat follow the cuttlefish idea.