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Old 04-15-2019, 05:18 AM   #46
popgun pete
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Re: Rob Allen Carbon Fiber Barrels

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It must have an effect due to drag. The less the spear wobbles in flight, the faster it will fly, the harder it will hit. We did have a slight drop in penetration which proves this. Both these guns were shot with same spear and same rubbers and line (swapped out).
So the shaft was not knocked off course, which is what I figured would be the case as otherwise all alloy guns with plastic muzzles would be the subject of complaints. To truly find out differences takes lots of shots as even with one gun you get some variations and if the averages of the test groups separate out sufficiently then you have a real difference between the guns. I have seen many guns being tested and the variability of results often masks true differences and if one guy does all the shooting then he starts to get tired and that is another variable, plus the bands tend to stretch out being more powerful at the start of shooting. These tests were for accuracy and the shaft hitting at the same angles over different flight distances in a pool.
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Old 04-15-2019, 05:43 AM   #47
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Re: Rob Allen Carbon Fiber Barrels

Pete, you are correct, there are so many variables.

In this case, the shaft does not get knocked totally off course, just into an oscillation while in flight, slowing it down somewhat.

When we pool test, we shoot at least 5 times and then take an average. The way the shooter holds is also a massive factor. We found a loss in penetration, up to 30% when comparing a limp wrist hold with a bent arm when comparing to a stiff and tight grip with a straight arm.

The amount of deflection due to muzzle impact is also relative to the rubber load. With this test we did, the rubbers were cut to give max power (shortest rubbers without overloading). If a gun is not loaded to max, the amount of “muzzle slap” would obviously drop.

Another subject for another discussion is water temperature. We are realizing more and more that water temperature affects the rubber performance is quite substantially.
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Old 04-15-2019, 03:35 PM   #48
popgun pete
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Re: Rob Allen Carbon Fiber Barrels

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Originally Posted by Rob Allen View Post
Pete, you are correct, there are so many variables.

In this case, the shaft does not get knocked totally off course, just into an oscillation while in flight, slowing it down somewhat.

When we pool test, we shoot at least 5 times and then take an average. The way the shooter holds is also a massive factor. We found a loss in penetration, up to 30% when comparing a limp wrist hold with a bent arm when comparing to a stiff and tight grip with a straight arm.

The amount of deflection due to muzzle impact is also relative to the rubber load. With this test we did, the rubbers were cut to give max power (shortest rubbers without overloading). If a gun is not loaded to max, the amount of “muzzle slap” would obviously drop.

Another subject for another discussion is water temperature. We are realizing more and more that water temperature affects the rubber performance is quite substantially.
Cold water temperatures is why rubber band guns were not as popular in Eastern European countries such as Russia and Ukraine compared with pneumatic and hydropneumatic spearguns. There are cold water compounded bands which can be used where divers operate in the icy waters of rivers and lakes, but they would not be much use in warmer water. Ocean temperatures vary, so the band rubber commonly used is a compromise for a range of conditions in temperate waters.
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Old 04-15-2019, 08:44 PM   #49
Jolinedaniel
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Re: Rob Allen Carbon Fiber Barrels





Pretty slick looking if i do say so myself
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Old 04-15-2019, 08:46 PM   #50
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Re: Rob Allen Carbon Fiber Barrels

Yes, and the blue bands look good!
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Old 04-16-2019, 10:48 AM   #51
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Re: Rob Allen Carbon Fiber Barrels

Nice looking gun! Now get it blooded.
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