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Old 02-07-2020, 12:39 PM   #1
Hpwatson
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Floating Shafts... Are they worth it?

I've been gearing up to start a new build soon and just doing some research on design details I might want to work into this new gun. I've noticed this new detail in a few recent speargun designs including Difiore (pictured here) as well as C4. There is a relief gap opened up between the shaft and the track so that sections of the shaft are floating above the body of the gun, minimizing contact with the track. On some C4 guns the shaft only touches the gun at the mechanism itself and the tip of the muzzle. I imagine the theory behind this is less resistance, maybe less noise, etc.. But I would have concern about shaft whip and accuracy problems. Once you design this in to a gun there's no turning back! It seems like a gun that wouldn't ordinarily whip a shaft might create some shaft whip with no support under the shaft. It also seems like the lack of support holding the shaft straight and true during the release could introduce accuracy problems. Does anybody have any further input on this design style and the pros/cons? I'm hesitant to design it into my gun but also very curious of the benefits.
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Old 02-07-2020, 12:41 PM   #2
Hpwatson
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Re: Floating Shafts... Are they worth it?

One comment about my accuracy concern - my friend has the C4 Mr Dark gun where the shaft is pretty much full floating and has barely any contact with the track, and while it isn't a very powerful gun he does say it is the most accurate gun he has ever shot.
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Old 02-07-2020, 04:17 PM   #3
popgun pete
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Re: Floating Shafts... Are they worth it?

A very long thin spear shaft can sag in the gun, a full length guide track will support it. If the gun has a thick shaft then it is unlikely to sag and guns such as the Sampson gun only supported the spear at the muzzle and the sear box mouth. Once the shaft gets moving a squeeze film develops between the shaft and any guide track, similar to your shoe slipping on a wet tile floor if you are wearing leather sole shoes.

Last edited by popgun pete; 02-07-2020 at 04:44 PM. Reason: added photo of Sampson Long Tom
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