I've been thinking of how to optimize my gear for when I hunt larger fish and would like the optimal spearshaft for my use. I'm planning to use 3*14 mm bands stretched to 3-3.5 times original length, and I'm thinking of getting two new spearshafts.
I'm leaning towards a 7.1 mm shaft for the general hunting and a 7.9 mm shaft for halibut hunting. For the general hunting I will be taking anything from horizontal to vertical shots, distances up to 5 meters I think. Halibut shots will likely be less than 5 meters distance, and if that far it'll be near vertical.
The reason for not using the same shaft is that i figured the 7.1 mm shaft will have a higher muzzle velocity and less time "in flight", meaning less vertical drop and giving better accuracy on long shots. I also figured the 7.9 mm shaft will have more "penetrating power" on the halibut shots where penetrating the fish is more of an issue than accuracy.
Am I right in my assumptions, is it the other way around, or does it not matter?
The thing that makes me uncertain is that I'll be using the same bands for both, which should give me identical force to power the shafts. My small amount of physics knowledge leads me to believe that if the forces that power the shafts are equal, this should give them equal force when leaving the gun (and for spearing the fish), but divided differently between speed and weight (force=speed*weight?). Then there should be no reason to use different shafts, just use the one that gives best accuracy on long horizontal shots (7.1 mm?).
I'm leaning towards a 7.1 mm shaft for the general hunting and a 7.9 mm shaft for halibut hunting. For the general hunting I will be taking anything from horizontal to vertical shots, distances up to 5 meters I think. Halibut shots will likely be less than 5 meters distance, and if that far it'll be near vertical.
The reason for not using the same shaft is that i figured the 7.1 mm shaft will have a higher muzzle velocity and less time "in flight", meaning less vertical drop and giving better accuracy on long shots. I also figured the 7.9 mm shaft will have more "penetrating power" on the halibut shots where penetrating the fish is more of an issue than accuracy.
Am I right in my assumptions, is it the other way around, or does it not matter?
The thing that makes me uncertain is that I'll be using the same bands for both, which should give me identical force to power the shafts. My small amount of physics knowledge leads me to believe that if the forces that power the shafts are equal, this should give them equal force when leaving the gun (and for spearing the fish), but divided differently between speed and weight (force=speed*weight?). Then there should be no reason to use different shafts, just use the one that gives best accuracy on long horizontal shots (7.1 mm?).
