Travel tube gun idea for split spears

popgun pete

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Jul 30, 2008

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• Oct 4, 2019

• #1

Usually travel spearguns have two piece spears that are of equal length, i.e. the shaft join is the center of the assembled spear, but that does not have to be the case. If the shaft can be made in unequal lengths then the bending at the join should be reduced. The shaft main body is sized to fit inside the barrel tube and the balance of shaft length, i.e. the tail, is taped to the main shaft for transport, all being packed inside the barrel tube. Rear handle and muzzle are removed and carried in your travel bag. If the spear tip unscrews then the spear can be resized to fit more main body length in the barrel tube and hence the tail piece can be shortened.

 

Last edited: Oct 4, 2019

popgun pete

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• Oct 4, 2019

• #2

Here is a version with a detachable spear tip.

 

popgun pete

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• Oct 4, 2019

• #3

Watertight bulkheads can use "O" ring seals to be loop attached to the transverse screws and nuts that hold the gun end pieces on. This bulkhead method has been used in the past and the cord loops are used to pull the bulkheads out of the gun. Increasing pressure at depth cannot push the bulkheads in because they are restrained by the loops which are anchored on the screws.

 

Last edited: Oct 5, 2019

popgun pete

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• Oct 5, 2019

• #4

Note so that you don't scratch the barrel tube bore it would be best to cover the ends of the shaft with a turn or two of vinyl tape, otherwise the bulkhead "O" ring may not seal the tube when you put the gun back together. A warning sticker on the barrel tube may be in order stating that the tube is heavy, especially if it has 3 spears nestled inside it making it virtually an iron bar, so don't pitch it should be the message to baggage handlers.

 

Andrew the fish

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Oct 17, 2010

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• Oct 13, 2019

• #5

I was thinking about something similar for some time. Shaft is the biggest problem, and I like your idea of having it in two unequal pieces.

However, there is one thing I don't understand - why shaft needs to be stored inside the tube? Why all the trouble with o-rings and watertight bulkheads? Shaft pieces can be easily taped to the side of the tube, or lashed with a string. Or stored in soft nylon case, like tents and fish rods etc. You still need a soft case to keep pistol grip and spear tips and spare parts etc. The whole design becomes simpler and cheaper.

 

popgun pete

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Jul 30, 2008

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• Oct 13, 2019

• #6

Andrew the fish said:

I was thinking about something similar for some time. Shaft is the biggest problem, and I like your idea of having it in two unequal pieces.

However, there is one thing I don't understand - why shaft needs to be stored inside the tube? Why all the trouble with o-rings and watertight bulkheads? Shaft pieces can be easily taped to the side of the tube, or lashed with a string. Or stored in soft nylon case, like tents and fish rods etc. You still need a soft case to keep pistol grip and spear tips and spare parts etc. The whole design becomes simpler and cheaper.

Click to expand...

It was just to keep things all together, plus it is not my idea as one time I was sent a gun packed that way being a cocking stock gun with a screw on tip, the spear fitted inside the barrel tube and the rest of the gun came in a short rectangular box, plus it looked less like a gun to thieves during transport.