Double rollers: are they good? Red Tide double roller. can you shoot by loading half of the shaft? is double roller more range then single roller?

[yulichenlu]

Double rollers: are they good? Red Tide double roller. can you shoot by loading half of the shaft? is double roller more range then single roller?
I am interested in double roller sbut no one i know uses it.
https://redtidespearfishing.com/products/spearguns-roller-series?variant=13700517265510

 

[musubi]

Double rollers: are they good? Red Tide double roller. can you shoot by loading half of the shaft? is double roller more range then single roller?
I am interested in double roller sbut no one i know uses it.
https://redtidespearfishing.com/products/spearguns-roller-series?variant=13700517265510

I'm sure other people will chime in, but I'll give my opinion to help bump this.
First off, that's a nice looking gun! I like the integration of the rollers.
As far as if they're any good or not, as long as the bands are powered appropriately (assuming gun components give no issues) to the shaft size, it should shoot fine. My main concern would be making sure you're not over powering the shaft.

By shooting half the shaft, do you mean loading on the rest tab only, or shooting only one band? Regardless, the answer would be yes, with the exception of trying to load two wishbones on the rest tab. I wouldn't do that. But loading one band on the rest tab only wouldn't really shoot well. And if you're loading only one band, completely, it may not be very effective, unless you're just trying to shoot something point blank.

As far as range, I think a properly setup single roller can have just as much range as a double roller.

 

[popgun pete]

Guns with multiple bands are about splitting the loading effort, not bumping up the shooting range. Ideally the completely banded up gun shoots the spear at the maximum stable velocity out of the gun. Too much power into the shaft and it will flex in the gun and bounce off part of the gun structure sending the shaft off course. The downside of splitting the loading effort is the gun takes longer to load. Shooting the gun with it only partially loaded will reduce the speed out of the gun and the range of the shot, with the shaft falling earlier in its flight.

 

[Andrew the fish]

...
As far as range, I think a properly setup single roller can have just as much range as a double roller...

aha, “properly setup”, what if we have properly set up double roller then?

 

[mad mat]

With original guns to lesson power you crimped the rubber mid way with your hand. Haven’t tried that with rollers and don’t think it would work And I wouldn’t try it with a tabbed shaft. Instead I run a slightly longer line that connects the two rubbers near the handle. If you spot a cray or need to de power, slacken off the line. I use a quick release half hitch. It never comes undone unless you pull the tag end. Works a treat.

 

[musubi]

aha, “properly setup”, what if we have properly set up double roller then?

My statement was assuming a properly setup double roller. As Pete mentioned above, it's about splitting the load, not increasing the range. If someone wants a thicker shaft for bigger game, then a double roller might be a better option as loading a single band to make the thicker shaft shoot at max stable velocity might be quite a task.

 

[Andrew the fish]

As far as range, I think a properly setup single roller can have just as much range as a double roller.

My statement was assuming a properly setup double roller. As Pete mentioned above, it's about splitting the load, not increasing the range. If someone wants a thicker shaft for bigger game, then a double roller might be a better option as loading a single band to make the thicker shaft shoot at max stable velocity might be quite a task.

I don’t understand what you are talking about. Define your version of “properly setup” then. I am imagining a roller with single band, with band stretch at max, and thickness just about manageable to load. This is what I would call a “properly setup single roller”.

Now, assume the barrel is sturdy, and shaft is thick, and trigger mech is plenty strong. Adding one more band will increase the shaft energy.

What Pete has mentioned, is the situation when increasing the band thickness is not possible. Refer to my version of “properly setup” roller with maxed-out band thickness, say, 16mm. We split the load into two 16mm bands rather than upping the thickness to some monster 22mm, and this is how we split the load. We might go with two14mm bands, which would be even more comfortable to load, and still get an increase in range, over our original single roller.

 

[musubi]

I don’t understand what you are talking about. Define your version of “properly setup” then. I am imagining a roller with single band, with band stretch at max, and thickness just about manageable to load. This is what I would call a “properly setup single roller”.

Now, assume the barrel is sturdy, and shaft is thick, and trigger mech is plenty strong. Adding one more band will increase the shaft energy.

What Pete has mentioned, is the situation when increasing the band thickness is not possible. Refer to my version of “properly setup” roller with maxed-out band thickness, say, 16mm. We split the load into two 16mm bands rather than upping the thickness to some monster 22mm, and this is how we split the load. We might go with two14mm bands, which would be even more comfortable to load, and still get an increase in range, over our original single roller.

Properly setup would be where a gun is equipped with a shaft and appropriate band(s) for the shaft as to not over power the shaft nor cause excessive recoil such that the gun or the user can't handle, but provides adequate power for the fish being hunted.

Pete can speak for himself, but I believe he was referring to any multiple banded gun, regardless if the person used a band thicknesses that were possible or not.

 

[popgun pete]

Yes, that is right,

A given spear can only be driven so fast on an open track gun before it buckles on the way out, so there is an upper limit to how much energy can be applied to it by the gun and still be shooting straight. That energy can be provided by one band or multiple bands, the latter splitting the loading effort. Practically bands only get so large in diameter, so then you need at least two as few could load a single band with a 200 pound plus pull. Efficiency falls off with extra wishbones and band mass dragging through the water, but this can be offset by slightly stronger bands making up for it, however the same energy ends up in the shaft. To drive the shaft past this limit you can use a closed track gun, but this in turn gobbles up energy through extra friction in the closed track, so more band power is needed as you are throwing some away, but the spear energy goes up. Guns operating like this are often in an area of diminishing returns, more and more band energy is needed to gain just a little bit more at the shaft and the gun takes a long time to reload.

Spears can be driven at greater velocity out of tail end drive, closed track guns like hydropneumatics because a loading pump splits the loading effort, but these guns are nowhere as versatile to use as a band gun and take a long time to load. Pneumatics are similar, but limited by the loading effort, plus there is a danger you can bend the spear if you don’t push straight during muzzle loading. Usually this is done with one arm, you can use two, but you will be standing on something to do it and using a double-handed loader. If the spear gets away from you before latching then you are in big trouble.

All spearguns are limited by the drive length onto the shaft, a longer stock gun can drive the shaft for that much longer and a rollergun, like a pneumatic or hydropneumatic, can drive the shaft the full length of the gun stock, something a standard band gun cannot do. However the latter are the fastest guns to load and shoot, plus they enable a rapid change of busted bands, something that takes much longer on a rollergun. If you can toss one gun in the boat and grab another then that is not such a problem because you can always repair the first gun later after the dive.

 

[Mr. X]

FYI somebody called something like coatesman has posted quite a good series on rollerguns on YouTube.

I think he sells muzzles for and/or with Rob Allen railguns. Pretty sure he featured double rollers on some/all his videos (perhaps as RA sell their own single rollers?).

He seemed to use mainly rollers these days. At least that's what he seems to recommend.

I think you can possibly load just one band or/and just load to the easier shark fin if you want less power. But I think double rollers are a bit extreme, perhaps best reserved for " Blue water" hunting?
And better to use something shorter and simpler for reef hunting.

 

[yulichenlu]

Thanks everyone ofr the reply.
i think a 16mm band on a roller is a bit hard to load, which is why i was debating to use a double roller with 14mm bands.
In the end im going after pathos roller laser carbon 110 . its better for reef hunting

 

[Andrew the fish]

two 14mm bands is what I am thinking too. Ease of loading makes hunting so much more pleasant.

About speed of re-loading, since we touched this subject, I have to say that for me, untangling the shaft line and locking the shaft in and wrapping the line takes the most time. Also taking care of fish, this could be a long minute. Single band or double makes hardly much difference, 10 seconds at most.

 

[Mr. X]

I would think a 110cm single roller speargun would be powerful, even with 14mm bands.

Or try using a long (40cm?) loading aid (elastic loop, with hook and wishbone) with thicker bands?

I think my 95cm rollergun uses 16mm bands. I have a thicker loading grip loop built into the wishbone, which helps. I bought some spare bands specifically for it in a closing down sale but they are even thicker (19mm?); I would have much preferred 14mm bands . I was able to load it ok with 16mm bands but 14mm would have been easier and more pleasant. And probably still plenty powerful (?).

 

[yulichenlu]

i just bought the pathos roller 110 speargun. the loading tabs it has in the bottom will help me a lot.
main reason is that in taiwan no one sells the loading assist, and i bought 2 from dive inn websit before. one came with really bad rubbers which seems that it was in the storeroom for a long time, first time use and it broke fell down to deep sea. I generally dont want to be dependent on load assist when i cant get them easily.

 

[yulichenlu]

was hoping double rollers with twin 14mm , will also neglate the use of a load assist