SPEARFISHING WITH BELLY BOAT SEVENBASSSPEARFISHING WITH A BELLY BOAT SEVENBASS: A... SPEARFISHING IN PUGLIA - BARISPEARFISHING IN PUGLIA - BARI SOUTH EAST OF... SPEARFISHING IN FRANCESPEARFISHING IN FRANCE WITH THE EMERALD WATER... SPEARFISHING IN IRELANDSPEARFISHING IN IRELAND IN THE REGION OF KERRY... SPEARFISHING IN INDONESIASPEARFISHING IN INDONESIA BY DINOSAURE... SPEARFISHING IN DENMARKSPEARFISHING IN DENMARK IN THE WATERS OF... SPEARFISHING IN GIBRALTARSPEARFISHING IN GIBRALTAR ON THE WRECKS OF THE... SPEARFISHING IN CAMPANIASPEARFISHING IN CAMPANIA ON WWII... SPEARFISHING IN LAZIO - ITALYSPEARFISHING IN LAZIO - ITALY FABRIZIO... SPEARFISHING IN SOUTH BRITAIN - FRANCESPEARFISHING IN SOUTH BRITAIN - FRANCE THE... SPEARFISHING IN VENEZUELASPEARFISHING IN VENEZUELA IN THE CARIBBEAN... SPEARFISHING IN TUSCANYSPEARFISHING IN TUSCANY AT THE "ISOLA DEL... SPEARFISHING IN NORTHERN GREECESPEARFISHING IN NORTHERN GREECE THANASIS... SPEARFISHING IN FLORIDA - USASPEARFISHING IN FLORIDA - USA JORGE MARIO... SPEARFISHING IN WALES - UKSPEARFISHING IN WALES - UK DARIO DELI'S SEA... SPEARFISHING IN NORMANDYSPEARFISHING IN NORMANDY CHRISTIAN ANDRE AND... DIVING ON THE WRECK OF TORRE VADOTEVFIK KAPTAN 1 DIVING ON THE WRECK OF TORRE... |
NEWS
DEEP SPEARFISHING MASTER CLASS
ONLINE COURSE WITH GIACOMO DEMOLA
Nowadays by surfing the web you can find whatsoever type of info about spearfishing and despite the great effort made by many top players to convey the message that an adequate course is the safest way to practice this sport, many still go for a DIY approach just a s
TECHNICAL ADVICES
SPEARFISHING LIGATURES AND KNOTS
VIDEO TUTORIALS
Those shown in these two videos are the most common knots used for spearfishing. They represent the basis for handle a speargun. We will show the constrictor knot to secure the eyelets in the bands, the knot to create the eyelets and the slip knot to create the loading handle for the
THE LOW TRAJECTORY SOLUTION ROLLER UP
I have been seeing and testing different roller spearguns for years. They are powerful and performing but they all have the same problem: a low trajectory. In some cases it is not that important but in others it makes the easiest catches impossible. It is probably for this reason that such a kind of speargun has not had the success it should have.
Lately I decided to study the matter in order to figure out what generates the problem and how it could be possibly solved and in the end I succeeded. I found the cause of the low trajectory and with a few changes I solved the problem. Here is my solution ...
THE CAUSE
One day, I was at sea with a friend of mine and I decided to pass him my rollergun in order to be able to film, close to the muzzle, the shooting moment and this allowed me to realize what the problem was.
Analyzing every single photogram of the movie I realized that the muzzle gets suddenly pushed up when the bands end their run and the dyneema wishbone touches the metal stopper, a phenomenon invisible to the naked eye. When this happens the back of the shaft is still on the rollergun barrel, between the two pulleys to be precise, so the shaft gests an upwards slap that affects its trajectory. This also explains why a lightweight shaft is more affected by this than an heavier one.
How can this be sorted out? I had a plastic roller muzzle so I took a Dremel tool and some files and I dug the muzzle in the space between the two pulleys and shortened the muzzle output channel almost down to the pulleys axe in order to ensure that the muzzle can’t touch the shaft even if we tilt the gun.
The outcome? Just amazing! All the shots come out perfectly straight even with light shafts. To confirm this theory I made the same changes on another commercial rollergun I knew it was particularly affected by such a problem, however I had to cut a large part of the muzzle to get the same results and in the end I was finally able to make straight shots.
I called it "RollerUp", and it can be used with any rollergun. The wooden ones are even easier to properly shape, however, we need to find an alternative solution for the metal stopper. Unfortunately, some plastic muzzles need a definitive cut of the front portion to be fully and properly operating.
Here is a little drawing with the modification theory, the concept is simple: just consider when the shaft is about to leave the barrel and the last 10 cm of it are still touching the wood. Well you have to shape the muzzle in order to avoid it to touché the shaft even if we lift the rollergun about 1cm. The only way to do this then is to cut the spear-rail a few centimeters before the pulleys axe and dig the remaining portion of the muzzle the shaft slides on.
If you have any comment please post it down here.
Ivan Palumbo
Slide me
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GUIDE TO FREEDIVINGINTRODUCTION TO BREATHING FOR FREEDIVING
BY MARCO VALLARINO
A lot has already been said and written about breathing, as it has always been the object of several studies through time
PHYSIOLOGY AND BIOMECHANICS
BY MARCO VALLARINO
PHYSIOLOGY
In order to keep living our cells need the oxygen, available in the air we breath and that the body takes constantly and cy
BREATHING EXERCISES
BY MARCO VALLARINO
USUAL RESPIRATORY SCHEMAS
Usually in quiet breathing, the diaphragm is the only muscle to work, while in the middle breathing it works together
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