Speardiver 400 lb & 300 lb mono line for speargun shooting line

    If you were ever curious whether the 400lb and 300lb rated Speardiver mono line actually lives up to its name, I made this video. The machine measures the increasing load in pounds, and stops automatically when the line breaks. You can see how low stretch the mono is, this is crucial to maintain a high breaking strength when using crimps.


    Speardiver 400lb mono speargun shooting line test - YouTube


    Speardiver mono shooting line is available from www.FreediveStore.com. 400lb and 300lb 100 yard coils, in black, blue, red and hi-vis yellow/green.



    now re test it with double and aluminum crimps , thats the real test , all mono should test well above its stated weigh, the rating is the minimum breaking strain . if you can get close to that rating with a crimp ,then you have something
    phil

    I already have something, I have good mono. Everyone knows that a knot or a crimp will weaken line. Maybe all mono "should" test at or above its stated breaking strength, but not all mono does. Now you know Speardiver mono does.

    Impressive, Try a dynamic shock test now.


    (e.g. Rig line to ceiling, then attached to a weight, say 20 lbs and drop off a ladder at say 6 feet. Tension achieved at 2 feet from ground. That gives you 4 feet of weight accelerating)


    Increase Weight till failure. You get to 50 lbs, I will be impressed. And yes it breaks at crimp or on top of thimble.

    Nice you got the RIGHT set up.


    I used a Weight Belt over the cider block. I switched to Mono on my guns back in the early 90's and did some testing then. For the static test I used a large fish scale and a wench.


    You have fancier equipment for that test.


    Those of you out there , make sure you wear your safety glasses and other PPE in doing these tests.

    Quote from phil herranen

    now re test it with double and aluminum crimps , thats the real test , all mono should test well above its stated weigh, the rating is the minimum breaking strain . if you can get close to that rating with a crimp ,then you have something
    phil


    Yeah, those would be the numbers I would be interested in!
    Everyone know it will have a lower breaking strength when crimped.... but how much lower? what kind of percentage? It should vary considering different crimps and crimping techniques but still, it would be nice to get an estimate.

    Wow you guys are trusting souls. Judging by your disregard for the video, you take it for granted that all mono line from other manufacturers lives up to its stated breaking strength. I don't have patience for this kind of thinking because I know it's not true. I'm the only one who put up a vid of my line being tested to prove the breaking strength, because I'm meticulous about the gear. If you know what you're looking for, the two factors that contribute to how well the line will hold up crimped, are breaking strength and low stretch. When a line stretches under load it becomes thinner and starts to slip through the crimp, that's when the crimp cuts into it and the line breaks. In the video you can clearly see how low stretch Speardiver mono is right up to the end. IMO it would be wishful thinking to buy other mono simply assuming that it performs the same, I wouldn't.


    Anyways to give you an idea of what you want to know. A crimped loop held my weight which I'm embarrassed to say is 240lb.

    Quote from marginatus

    Yeah, those would be the numbers I would be interested in!
    Everyone know it will have a lower breaking strength when crimped.... but how much lower? what kind of percentage? It should vary considering different crimps and crimping techniques but still, it would be nice to get an estimate.


    I had a High Liner bench swedge tool (450bucks) that I tuned the jaw setting tension on for the Momoi line and crimps I was using. After days of practice with hand polished crimps I was able to get test samples to 95% of the 400lb mono. Untuned hand crimpers are a crap shoot, and line/crimp failures at 40 to 60% of rated line test is common. High quality mono and crimp jobs are only as good as the swedging tool and the operator.


    Cheers, Don

    "Great mother ocean brought forth all life, it is my eternal home'' Don Berry from Blue Water Hunters.


    Spearfishing Store the freediving and spearfishing equipment specialists.

    Quote from Don Paul

    I had a High Liner bench swedge tool (450bucks) that I tuned the jaw setting tension on for the Momoi line and crimps I was using. After days of practice with hand polished crimps I was able to get test samples to 95% of the 400lb mono. Untuned hand crimpers are a crap shoot, and line/crimp failures at 40 to 60% of rated line test is common. High quality mono and crimp jobs are only as good as the swedging tool and the operator.


    Cheers, Don


    Interesting stuff!

    This fits in with this dialog, so will add it here vs a new thread. I will try to be concise.


    Two buddies bought new Cyrano 700's for use on Northern CA coastline.


    They wanted the typical set-up I have on all my small air guns. Got them hardened shafts and made them the rear tapered connector, replaced the muzzle washer with a new washer that has a better aspect ratio with a counter-bored for spring, and the slider. Made them my custom clip that is larger with only one spiral. (Larger clip easier to handle in our frozen waters).


    All I had left was to do the single crimp to fit into the slider ring. Go figure I couldn't find the one's I used in the past. Decided to just order some more, but couldn't find any. I have no idea where I got them before or if I just made them.


    ---------- Ok , now to crimping saga ------- I made some sleeves out various materials ( various Aluminum types, 360 and 260 brass, bronze) and I just wasn't getting a good crimp. After many attempt and failures below 100 lbs I was..... :crazy:....


    At the end of the game I cheated and ran an undersized tap in the front side of the crimp to give me a little grip onto the mono. I tried to show that in picture. That seemed to do the trick, but not ideal solution. Thusly my posting here to see what I was doing wrong.


    The Stretch of the mono during test phase. (I'm using .080 Green Shakespeare line that is used for Trim lines) I've had it a long time and It's worked great till now.


    I decided on Aluminum for final testing today from various web info I found.


    The surface area of the crimp is greatly reduced doing it this way ( .40" long) vs. typical double holed crimp with thimble. I got one of those in picture on a swivel. That was fine. This was part of my problem.


    I'd done this many times in past years but losing my stash of crimps got in in a pickle. I tested an old crimp like this and it was super strong, I couldn't break it. (copper crimp)


    I started to make a pressing die and swage it with 20 ton, but read somewhere not to over crimp.


    Only thing I wanted to test was using copper for sleeve, I didn't have any material to mess with.


    I'm thinking now that the stretch of the mono was a big part of it, like what Dan said earlier in this Thread. The grip on mono with the touch of grooving from tap got it solid with a 200+ lb load.


    I'm thinking I might buy a 6 sided ferrule crimper vs a 2 jaw crimp. More to say, but a good start.


    Ready for some quality feedback.





    Edited 3 times, last by Linghunt ().

    The small hole on the slider has a thru hole at .096" and a counter-bore of .147" to house the crimp inside the hole. The crimp fits up against that lip inside. Make sense? I had typo on bold number

    Edited 2 times, last by Linghunt ().

    That's what I thought. Like I said I wouldn't expect it to hold anything like that. The crimped loop gives it a lot of holding power. In a pinch if you don't have a crimper, you can just make a loop using the crimp and burn the end of the mono, it will hold some fish.

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