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All About Guns What's your weapon of choice, and why? Discuss the beloved speargun here! |
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04-03-2020, 03:44 AM | #91 | |
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Re: Made a 145cm inverter, 10mm shaft
Quote:
You mean Dean's Koutras from Addiction shafts? Addiction Shafts do look very well made. I definitely buy some to try when ever I get back to work. Last edited by Satdiver; 04-04-2020 at 01:10 AM. |
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04-03-2020, 12:26 PM | #92 |
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Re: Made a 145cm inverter, 10mm shaft
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04-03-2020, 01:54 PM | #93 |
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Re: Made a 145cm inverter, 10mm shaft
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04-03-2020, 02:04 PM | #94 | ||
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Re: Made a 145cm inverter, 10mm shaft
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Personally I think better solution is using softer bands or bands with smaller OD. That gives enough pretension, and shaft accelerate all the way moving to the head of the gun. |
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04-03-2020, 02:26 PM | #95 |
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Re: Made a 145cm inverter, 10mm shaft
You get more stretch travel for the same force on thinner bands. Bands can be thought of like an onion cut in cross section with rubber tubes of increasing diameter stacked on each other. More rubber in the cross-section then it is harder to stretch it out.
The ratio of the cross-sections of 16 mm and 14 mm bands is (16/14)^2 which equals 1.306, therefore for the same elongation it should take 30% more effort to pull 16 mm bands compared to 14 mm bands, everything else being equal. If the bands have a central bore hole then we need to adjust the cross-sectional areas for the missing material represented by the hole, thus bands of the same outer diameter but with a smaller central hole will have a greater cross-section of rubber and will need more effort to pull them to a certain elongation. Conversely a larger central hole will make them easier to pull. Last edited by popgun pete; 04-03-2020 at 06:47 PM. Reason: extra comment |
04-04-2020, 12:06 AM | #96 | |
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Re: Made a 145cm inverter, 10mm shaft
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04-04-2020, 01:27 AM | #97 | |
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Re: Made a 145cm inverter, 10mm shaft
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I did like this gun, the balance was perfect. Your band setup up on your gun definitely works very well, can see that quite clearly with the video you shared. I think there would be more recoil with smaller I/D bands on my gun, but would be a interesting test to see the difference. |
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08-30-2020, 04:34 AM | #98 | |
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Re: Made a 145cm inverter, 10mm shaft
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apart from your head which is 5mm wider your measurements are almost identical to alemanni for 10 cm more draw, it is remarkable work. have you had success? |
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08-30-2020, 09:01 AM | #99 | |
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Re: Made a 145cm inverter, 10mm shaft
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08-30-2020, 10:23 AM | #100 |
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Re: Made a 145cm inverter, 10mm shaft
wow, nice gun, I'm still using 7.5 on my four band 150... 10 mm!!! I wouldn't even know where to get those lol.
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08-30-2020, 01:05 PM | #101 |
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Re: Made a 145cm inverter, 10mm shaft
In fact, the best american made shaftAre the Dean Koutras and Mori, The hunt ones that I see at their website, shows poor work and bad weld at the shark fins
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09-01-2020, 12:57 AM | #102 |
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Re: Made a 145cm inverter, 10mm shaft
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11-13-2020, 12:40 AM | #103 |
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Re: Made a 145cm inverter, 10mm shaft
Hello
does your speargun float with the spear ? |
11-14-2020, 01:40 AM | #104 |
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Re: Made a 145cm inverter, 10mm shaft
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11-14-2020, 05:41 AM | #105 |
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Re: Made a 145cm inverter, 10mm shaft
Merci beaucoup
Last edited by fredfoes; 11-18-2020 at 10:39 PM. |
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