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Non-Gun DIY Projects and Customizations This section is for your DIY spearfishing projects and customization other then spearguns.

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Old 02-27-2017, 11:44 AM   #16
phil herranen
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Re: 2 or 3 bands for best performance

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Originally Posted by ApneaAndrew View Post
I'm curious if you or anyone has tested the longevity of taking bands to 360%+? Primeline's general statement is taking their rubber past 350% will cause it to deteriorate.

Has anyone tried penetration tests with the small ID at 370% after it has been loaded for 2 hours?


Jason, 3 tight 16mm bands will often cause shaft whip on a 7mm shaft, possibly even 7.5mm. Or if in an enclosed track, a lot of friction from the shaft trying to whip. Maybe offer the customer 3 x 14mm bands with the 7.5mm shaft - if he wants 3 bands so badly.
With sharkfin shafts and deep tracks , shaft whip is kind of a myth unless you have supperlong riffe style overhang or allready have a upward bend in the shaft .

Sharkfin put a off center downward force on the shaft making it want to bow down into the track .

Overpowering a shaft with a shallow track it can go left and right .

What most people call shaft whip is really a overpowered gun with muzzle lift or drop flexing the shaft as it leaves the gun making it occilatie as it travels forward
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Old 03-23-2017, 06:53 AM   #17
Manavie
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Re: 2 or 3 bands for best performance

Quote:
Originally Posted by ApneaAndrew View Post
I'm curious if you or anyone has tested the longevity of taking bands to 360%+? Primeline's general statement is taking their rubber past 350% will cause it to deteriorate.

Has anyone tried penetration tests with the small ID at 370% after it has been loaded for 2 hours?


Jason, 3 tight 16mm bands will often cause shaft whip on a 7mm shaft, possibly even 7.5mm. Or if in an enclosed track, a lot of friction from the shaft trying to whip. Maybe offer the customer 3 x 14mm bands with the 7.5mm shaft - if he wants 3 bands so badly.


Great point of having it being loaded for some time


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Old 03-23-2017, 07:47 AM   #18
Behslayer
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Re: 2 or 3 bands for best performance

Andrew, I think "Deeper Perspectives" Podcast showed some of the effect of time on loaded band power. I think the general take away was bands lose power over time. Bands at higher stretch lose more power over time than bands at lower stretch.
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