I think what Murat is trying to explain is : rubber actual output as delivered to a shaft launch speed its not totaly equal to harder rubber means faster shaft speed. Some rubbers maybe more "snappy" than others, so it shrink back faster and thus output a good shaft speed.
This can only be proven by a chronograph........unfortunately, cause more power is only true if shaft speed is faster.
Since underwater chronography is not common, it might be a safe bet to assume that the harder to load rubber will give better power output.
However, I do believe that there could be a very strong possibility that among so many brands available, there must be some rubber more "snappy' than others even though both are measured at the SAME rubber pressure when strecth to the typical 300%, the commonly used figure.
Let Iya make some money next year selling some hot boat, I will then make or buy and modified a chronograph for underwater use. This is a must for moron like me......:head
I used to have a fire arm chronograph to measure my airgun pellet speed cause I was a master tuner for my friends and I was not comfortable not knowing the maximum potential of my precision airguns.
The lesson I learnt after firing more than 20,000 rounds passed the chronograph speed sensors, are very interesting. The only airgun propulsion device I can compare to a speargun is the spring ( spring powered airguns ) against a rubber of a speargun.
The spring relies on twisting motion of the metal itself, whereas the rubber relies on stretch of the rubber material.
Short of a chronograph, my old test were using telephone books/yellow pages to tell penetration cause it is cheap and has at least 1000 pages. However, the angle of the shot matters a great deal on penetration result, perhaps some +-25 pages of a typical 800 pages penetration (double side pages actualy ). Don't talk about the pellet/bullet (4.5mm/0.177 cal ) shape, it matters a greater deal on penetration, just like a spearhead.
Until I own a chrono, telephone books were the only way. On my spring powered airgun, I imported springs from US and UK for use and learnt that extra cocking effort, which is equivalent to rubber pull effort in a speargun and the amount of extra recoil was not a 100% prove of which the gun will shoot faster pellet. Only the chrono can tell the difference cause I was looking at only 10-15% power difference. The metal spring science and rubber science maybe very different but for arguement sake, a chronograph is a must for rubber manufacturer to use to actual see the power potential of the rubber material in real time.
If you are consistently succesful shooting 3mm or more deeper into a reference wood target using one rubber over the other from the same distance, using the same shaft and spearhead from the same gun with the same shooting line set up and 100% everything the same except the rubbers, this then speaks for itself.
And why have not the speargun manfacturers chrono their shaft speed..........SIMPLE, cause it ain't me owning those speargun factories.
This can only be proven by a chronograph........unfortunately, cause more power is only true if shaft speed is faster.
Since underwater chronography is not common, it might be a safe bet to assume that the harder to load rubber will give better power output.
However, I do believe that there could be a very strong possibility that among so many brands available, there must be some rubber more "snappy' than others even though both are measured at the SAME rubber pressure when strecth to the typical 300%, the commonly used figure.
Let Iya make some money next year selling some hot boat, I will then make or buy and modified a chronograph for underwater use. This is a must for moron like me......:head
I used to have a fire arm chronograph to measure my airgun pellet speed cause I was a master tuner for my friends and I was not comfortable not knowing the maximum potential of my precision airguns.
The lesson I learnt after firing more than 20,000 rounds passed the chronograph speed sensors, are very interesting. The only airgun propulsion device I can compare to a speargun is the spring ( spring powered airguns ) against a rubber of a speargun.
The spring relies on twisting motion of the metal itself, whereas the rubber relies on stretch of the rubber material.
Short of a chronograph, my old test were using telephone books/yellow pages to tell penetration cause it is cheap and has at least 1000 pages. However, the angle of the shot matters a great deal on penetration result, perhaps some +-25 pages of a typical 800 pages penetration (double side pages actualy ). Don't talk about the pellet/bullet (4.5mm/0.177 cal ) shape, it matters a greater deal on penetration, just like a spearhead.
Until I own a chrono, telephone books were the only way. On my spring powered airgun, I imported springs from US and UK for use and learnt that extra cocking effort, which is equivalent to rubber pull effort in a speargun and the amount of extra recoil was not a 100% prove of which the gun will shoot faster pellet. Only the chrono can tell the difference cause I was looking at only 10-15% power difference. The metal spring science and rubber science maybe very different but for arguement sake, a chronograph is a must for rubber manufacturer to use to actual see the power potential of the rubber material in real time.
If you are consistently succesful shooting 3mm or more deeper into a reference wood target using one rubber over the other from the same distance, using the same shaft and spearhead from the same gun with the same shooting line set up and 100% everything the same except the rubbers, this then speaks for itself.
And why have not the speargun manfacturers chrono their shaft speed..........SIMPLE, cause it ain't me owning those speargun factories.
