Ver y interesting to think about breaking strength of different elements we use while spearfishing. One can then maybe assume for example that a imaginary 300 kg Dyneema would not make sense if another component breaks earlier. Can imagine a graphic that displays 'weak' or breaking points between a shaft, barb, notches, crimped loops, the shooting line and its attachment type to a reel line, then the real itself, and so on... Cool stuff. Keep it going! Love this.
Great videos Rob. All interesting. Was wondering if there is a way to test the breaking strain differences between notched shaft, mini tabs and wire tabs? I have snapped a handful of notch shafts through different scenarios so tend to stick to the mini barbs but wondering if there actually is a noticeable difference in the strength?
Professional videos Rob . Thank you for innovating ! I wonder what will be the breaking differences between mono attachment to spear heel vs attachment to shark fin…
In both cases the mono will fail at the crimp first. We did some tests a while back with cable pulling on our wire fin, the fin held way higher than what a mono crimp would, not sure what the actual load. The mono crimped break load will vary depending on the mono type and the crimp setting, we get between 100 and 120kg on the crimp and line we use. The breaking strain of mono might be slightly different between the load on a welded fin drilled hole and the hole in the rear of the shaft. The problem is, there will be a much greater difference/effect depending on the condition of the holes the line is passing through. The finish in terms of the smoothness and shape of these edges will have a much greater effect on the loading it can take.
@@RobAllenSpearfishing Thank you for the detailed and data based answer Rob . One more interesting comparison is breaking force of flopper vs drop off barb even though both of them wont be the weakest in rig chain… Thanks again for the great engineering experiments !
Funny enough, we had planned to film that "How To" for the speedline pouch when we were in the Transkei. Unfortunetly the conditions were not great for filming cleary. But stay tuned for when we do get the chance for filming and upload the video on the speedline pouch.
Super interesting Rob! I have always wondered about this test. I once had my RA shaft suck in some black reef sponge, after giving it a good pull (thinking it would rip the sponge) I was suprised that I broke it, but also suprised the breaking point was the shaft itself around the pinhole. I suspect there was some internal rust or hairline crack there as it was obviously nowhere near 200kg
Exactly the same arrived to me! I was surprised... I decided to make a new hole in order to put the barb even if the shaft is shorter now but it's very hard to make the new hole cause it's not the same material than the others shafts! Do you have an idea to do it?
@@stephanecrenn7861 The hole for the barb pin is unfortunately a necessity and obviously a week point. This area can easily become cracked/damaged when shot into rock at a specific angle. You won't realize it's cracked until the other side cracks and the tip falls off with little effort. You can normally see this, the old break will be dark and the fresh break still shinny.
@@RobAllenSpearfishing Thanks for your explanation, I love your shafts. It was a bad shot into the reef and as you said it happens in certain conditions(or maybe an air bubble during the building of the shaft?). Best regards from Réunion Island
i have recently gotten a 1100 rob allen and upgraded to a roller. I was thinking of upgrading to a double roller but I have been told that the spear doesnt go straight. I would like to know what I should do.
Excellent design, material and production that you are applying, on the other hand regional distribution / sales points are very limited. Overall the RA is not growing as deserved.
![Seungmin "그렇게, 천천히, 우리(As we are)" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/kAzmhLHePqU/mqdefault.jpg)
This guy is just amazing when it comes to his products
Ver y interesting to think about breaking strength of different elements we use while spearfishing. One can then maybe assume for example that a imaginary 300 kg Dyneema would not make sense if another component breaks earlier. Can imagine a graphic that displays 'weak' or breaking points between a shaft, barb, notches, crimped loops, the shooting line and its attachment type to a reel line, then the real itself, and so on...
Cool stuff. Keep it going! Love this.
Agreed. A chain is only as strong as its weakest link.
WOW! 😮😱 ⚒️270 - 260kg!⚒️ 👌👍
Great videos Rob. All interesting. Was wondering if there is a way to test the breaking strain differences between notched shaft, mini tabs and wire tabs? I have snapped a handful of notch shafts through different scenarios so tend to stick to the mini barbs but wondering if there actually is a noticeable difference in the strength?
Good idea, will look into setting up a test for that 👍
Professional videos Rob . Thank you for innovating ! I wonder what will be the breaking differences between mono attachment to spear heel vs attachment to shark fin…
In both cases the mono will fail at the crimp first. We did some tests a while back with cable pulling on our wire fin, the fin held way higher than what a mono crimp would, not sure what the actual load. The mono crimped break load will vary depending on the mono type and the crimp setting, we get between 100 and 120kg on the crimp and line we use. The breaking strain of mono might be slightly different between the load on a welded fin drilled hole and the hole in the rear of the shaft. The problem is, there will be a much greater difference/effect depending on the condition of the holes the line is passing through. The finish in terms of the smoothness and shape of these edges will have a much greater effect on the loading it can take.
@@RobAllenSpearfishing Thank you for the detailed and data based answer Rob .
One more interesting comparison is breaking force of flopper vs drop off barb even though both of them wont be the weakest in rig chain… Thanks again for the great engineering experiments !
Can you guys do a video on the Speedline Pouch? I've not seen a single video on it yet. don't understand how it works.
Funny enough, we had planned to film that "How To" for the speedline pouch when we were in the Transkei. Unfortunetly the conditions were not great for filming cleary. But stay tuned for when we do get the chance for filming and upload the video on the speedline pouch.
Super interesting Rob! I have always wondered about this test. I once had my RA shaft suck in some black reef sponge, after giving it a good pull (thinking it would rip the sponge) I was suprised that I broke it, but also suprised the breaking point was the shaft itself around the pinhole. I suspect there was some internal rust or hairline crack there as it was obviously nowhere near 200kg
Exactly the same arrived to me! I was surprised... I decided to make a new hole in order to put the barb even if the shaft is shorter now but it's very hard to make the new hole cause it's not the same material than the others shafts! Do you have an idea to do it?
@@stephanecrenn7861 you would need a vice and bench drill and find perfect center. But better off just getting a new shaft
Ok thanks for your advice👌
@@stephanecrenn7861 The hole for the barb pin is unfortunately a necessity and obviously a week point. This area can easily become cracked/damaged when shot into rock at a specific angle. You won't realize it's cracked until the other side cracks and the tip falls off with little effort. You can normally see this, the old break will be dark and the fresh break still shinny.
@@RobAllenSpearfishing Thanks for your explanation, I love your shafts. It was a bad shot into the reef and as you said it happens in certain conditions(or maybe an air bubble during the building of the shaft?).
Best regards from Réunion Island
Could you test firing into rocks will it bend the spear?
There are too make variables to show. The type of rock, speed the spear hits, at what angle etc, will show up many variations.
i have recently gotten a 1100 rob allen and upgraded to a roller. I was thinking of upgrading to a double roller but I have been told that the spear doesnt go straight. I would like to know what I should do.
Not a good idea if you want to fit 2 x 16mm as you will over power it. Yes, they are correct, over powering will cause inaccuracies.
Excellent design, material and production that you are applying, on the other hand regional distribution / sales points are very limited. Overall the RA is not growing as deserved.
Agreed, world raw materials supply and demand for products all big issues.