How Spearguns Work
Spearguns operate on two main ways of powering a spear, fired from a speargun, through the water. Rubber Band Gun are by far the most common and easy to maintain Spearguns, however there are also Pneumatic ( Compressed Air ) spearguns. Which type of gun is best, depends a lot on your own personal point of view, likes or dislikes and also the type of water that you intend to go fishing in. Personally we generally recommend rubber band guns as they as quieter and more straight forward to maintain.
Rubber Band Powered Spearguns
A rubber band powered speargun catapults the spear forward using the power of heavy duty rubber band(s) like a catapult or a crossbow. Rubber Band spearguns vary a lot in length, from around 45cm up to 115cm or even longer. The length of the rubber band speargun when quoted is NOT the overall length of the speargun (Unlike air powered spearguns). The length often quoted is in fact the barrel length. For example a Cressi Apache, Sioux or Geronimo Speargun listed as a 60cm gun has barrel length of 60cm, plus the head in front of the barrel and the grip length including the trigger mechanism. On a Cressi 60cm speargun, the head is 3.5cm and the grip is 20cm. So the total length of a 60cm gun is 83.5cm excluding the spear which hangs over the front of the speargun. The spear on a 60cm Cressi speargun is 92cm long and hangs over the front by 20cm. The total length for a loaded Cressi 60cm speargun from the front tip of the spear to the very back is therefore 103.5cm. This is an average based on the Cressi Sioux, Apache and Comanche Spearguns.
Compressed Air Powered or Pneumatic Spearguns
Air powered Pneumatic spearguns are usually shorter in overall length. Unlike rubber band powered spearguns above a 60 cm air powered speargun does indeed measures..... 60 cm. Compressed air spearguns work like a pneumatic air rifle by holding compressed air inside the barrel (Main Body) section of the speargun. When you insert the spear into the barrel it sits on top of a piston within the main body/barrel of the speargun. To load or charge a pneumatic speargun you use a loading handle placed over the tip of the spear you then force the spear and piston down the length of the barrel, and this compress the air inside the main body. When you have pushed the spear down and compressed the air enough the spear locks in place on the sear within the trigger mechanism. pneumatic guns are noisy when fired, and this can scare away other fish within your area. Pneumatic spearguns also require more maintenance including additional servicing and inspection to prevent the compressed air from leaking and overall mechanism failure. The sea is an unforgiving environment and is hard on pneumatic spear guns.