Looks like an old wood surfboard:@, how much shaft overhang on that gun?
Pucho, Jay's big gun had a standard Blue water gun and shaft along with a SS plates to enclose the shaft.
If I didn't build my own guns, the gun in the last picture would be the one I would hunt the blue with.
This gun and a handful of its brothers have taken more Blue Water fish over the last 20 years then I
could ever remember. The gun and one of the greatest minds in custom gun building, John Warren.
Cheers, Don
Don, thank you for your contributions, the bits of spearfishing history you give us a chance to see which we never would otherwise.
Thanks Dan, you guy's are my brothers, I hope I don't mess up threads by going off track.
I wish I could share some under water footage, but it was on someone else's dime.
This summer I'll mount a new video cam on one of by big Sten 140's and send FSF some cool shite.
Cheers, Don
4. "Boat tailing" the end of the spear shaft, again to make it more hydrodynamic
Hey Tinman could you please explain this concept. I'm not sure what you mean.
Also I believe another factor that could play a role is the slip-tip cable. If its kinked and twisted it could affect the speed and accuracy.:confused2:
Don, thanks for all the info, I am in the process of building two more guns, a 60" Hybrid and a 120 euro all new info i get is very appreciated including history and pics, on the big gun with the wing, now I see how hw made it, in the first pic looks like it was all wood and not the space between the gun and wing.
Thanks
4. "Boat tailing" the end of the spear shaft, again to make it more hydrodynamic
Hey Tinman could you please explain this concept. I'm not sure what you mean.
Also I believe another factor that could play a role is the slip-tip cable. If its kinked and twisted it could affect the speed and accuracy.:confused2:
I'm not speaking for Tin, but think of the end of a spear shaft like the tail of a plane or the stern of a
Americas Cup boat. But first...CAUTION DO NOT REMOVE ANY MATERAL FROM YOUR SHAFT
THAT REDUCES IT'S ABILITY TO LOCK IN THE MECHANISM.
I build my own mechanisms that are based on geometry from a old Australian mech called Undersee.
If you take apart many of the top big gun mech's today you find many have geometry based on Undersee
mechs. The tail of the shaft behind Undersee type shafts is very unfriendly to the water behind it.
Behind and in front of things moving at high speed we want to create Laminer Flow. ....to be cont.
Don
The factor that seems to slow my spearshaft down the quickest seems to be rocks... 
The factor the seems to slow my spearshaft down the most often seems to be fish... :cool2:
Stud!!
[quote='Don Paul','http://spearfishing.world/forums/index.php?thread/&postID=22600#post22600']I'm not speaking for Tin, but think of the end of a spear shaft like the tail of a plane or the stern of a
Americas Cup boat. But first...CAUTION DO NOT REMOVE ANY MATERAL FROM YOUR SHAFT
THAT REDUCES IT'S ABILITY TO LOCK IN THE MECHANISM.
I build my own mechanisms that are based on geometry from a old Australian mech called Undersee.
If you take apart many of the top big gun mech's today you find many have geometry based on Undersee
mechs. The tail of the shaft behind Undersee type shafts is very unfriendly to the water behind it.
Behind and in front of things moving at high speed we want to create Laminer Flow.
I you look at thw image you see the line loop is long and the swage is out of frame well behind the shaft tail.
I going to stop now on the shaft details before a get some kid that be lurking hurt.
Cheers, Don
Don, is it really possibly for there to be laminar flow along an object that is both creating forward disturbance and cavitating? isn't there going to be at least micro turbulence around the shaft?
i see how laminar would be ideal, but i feel like that is only possible on paper, no?
I have often wondered if the turbulence created by releasing the bands would disrupt the fluid dynamics effecting the shaft as well as the shafts own properties as it moved...
As long as we're at it, do we want laminar flow? Turbulence is bad for a n airplane wing, but good if you want lower resistance to pumping water through a pipe (laminar flow = more resistance).
Or how about those supercavitating torpedos?
or golf balls?
Did you guys see the mythbusters episode with the golf ball car?
I believed it. It was determined that a car with a surface that's pitted like a golf ball has better gas mileage. They put a layer of clay on a car and made hundreds of golf ball type pits on it. They accounted for the weight of the clay. They had a very precise way to measure how much gas was spent.
:thinking:interesting
I'm going to drill dimples on a spearshaft and compare it with another one exactly the same and see how they perform.......:D
A golf ball spearfishing boat sounds perfect for..
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