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Hi all,
I have decided to take picture of different wishbones that I have purchased or made myself and try to cover some differences in this area.
There are different kind out there, Dyneema , Metal wishbones with plastic caps. Combo between metal and dyneema line and deviations in between.Standard metal wishbones vs. Dyneema
Standard metal wishbones are with different metal and different shapes but basically all with a plastic cap with a screw that holds the wishbone body. Those are cheap and people will say easy to deal with vs. Dyneema but that is not completely correct as I will explain below.
Advantage of those standard wishbones is:
– Easy to take on and off and change if needed
– Done require a lot of knowledge and new spearos can easy deal with it and change them.
Disadvantages are:
– Not so good hydrodynamics due to plastic cap that will be in firing process acting as the water parachute and slow the spear.
– They are heavy and add extra weight to be pulled by rubber
– They are expensive for what they are
– Plastic caps are not that good quality and can break
– Screw does not always fit all rubbers
– They only can be used on pre cut rubbers and that narrows the selection of the rubbers and definitely adds the price.
– they are not that great to be used for the shark fin spears
– They normally add scratches to the body of the gun (depending of position of the rubbers)
– More dangerous for the divers fingers if they slip when loaded.Pure Dyneema wishbones(see pictures)
There is a saying that they are not easy to deal with. That depends. If they are made of 2 knots or 2 messing balls on each side and connected in one piece of the Dyneema line, then it is correct, they cant be changed that easy from one rubber to another or rubbers cant be that easy placed on another gun.
But there is actually no need to make the Dyneema wishbone with a messing ball or plastic ball on each side. That can be done with a proper knot that will hold as good as the plastic ball and it will be cheaper, you only need Dyneema and your fingers 🙂
Dyneema line used for wishbone needs to be of good quality and and I wil lreccoment at least 1.5 mm
I am using Antolas Dyneema 1,9 mm that is sold by Salimar and has strength of 380kg with Kevlarline inside.Advantages of the Dyneema wishbones are:
– Low weight, and therefor better performance and speed
– Cheap to make
– Great for use with shark fin spear
– More silent
– No parachute syndrome drag break as in standard metal wishbone
– They normally are great for double rubber setup due that they make possible for rubbers to stay close to eachother and close to spear.
– As easy to change as the wishbone with screw (Note: If you make them in 2 piece and with a line in between they are perfect).
– You can make wishbone only using Dyneema line wich is way cheaper then metal one
– They will not scratch your gun
– They allow you to use rubber sold in measures and that saves money 🙂
– Your rubber selection will be bigger because many rubbers are never made with standard measure and screw. Best rubbers are normally not. Like sigalsub(Ask Lamberto, he loves them 😉 ) that makes good rubbers and some great rubbers from Salvimar and Cressi.
– It is extremely easy and fast to change the rubber to another gun (Without the balls on end of dyneema wishbone, and with a extra connection line in between that makes it easy to change from one gun to another, takes 10 sec to shift the rubber).
– It allows you to create perfect size of the rubbers for the gun you have and spear length, diameter and weightDisadvantages of the Dyneema wishbones
– Wear time is shorter, it depends a bit on what Dynema you use and how sharp your shark fin is or slides for the wishbones on ordinary spear.
– It requires a bit training to learn how to make knots and do the best model
– You will need a tool for inserting the Dyneema in the rubber
– You vill need a formula to calculate measure of the rubbers to be perfect to your gun.See all of the pictures I have attached
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Here is picture of Dyneema I use and picture of ultimate Dyneema wishbone 😉 and in same time that is cheapest one, easy to change and with great performance wishbone type 🙂
I added the picture of the tool for inserting the Dyneema into the rubber as well.
I will add the video shortly how all of these knots are done, or you can buy the book like one on the picture 😉
I have added the finished result picture, and as well the picture of the constrictor not that it is used to fix the dyneema wishbone in to rubber. please do not use line for constrictor more then 1 mm – 1,2 mm -
Super fedt indlæg.
Jeg er blevet totalt inspireret til at kaste mig ud i dyneema eventyret.
Hvad er din holdning til denne type wishbone?
salvimar-dyneema-wishbones-with-armsmvh
Anders -
Det ser ud til at en del af indsatsen du har linket til består af messing – er det tilfældet vil jeg anbefale dig at finde en anden løsning da messing og latex er en dårlig kombination da det går i forbindelse med hinanden – du kan vælge at droppe indsatserne helt og i stedet blot binde en ekstra stor knude på det wishbone du ønsker at monterer.
//Lax
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Hej Anders
Hvis du gør som det er illustreret på billede nr. 2, uploadet af GOF, så behøver du ikke at skulle skifte andet end det line der kan finde på at knække. Wishbonet giver sig selv og udskiftning af armene kræver blot at du løsner det constrictorknot der holder dem fast ( du kan bruge en hobbykniv, men pas på med ikke at skære i elastikken )
Sørg for at tjekke om armene sidder som de skal, dvs. at du ikke kan trække dem ud under det constrictorknot du har bundet dem med – det kan desværre ske hvis knuden ikke er stor nok og det er surt først at finde ud af det når du ligger i vandet.// Lax
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@Helu det vil helt sikkert være en fordel med fins men det fungere altså også helt fint uden. Du skal blot file hakkene en smule til hvis de er for små eller der er skarpe kanter/grater.
Jeg sidder i Sverige med konen så har ikke lige billeder ved hånden men kan lige smide et ind når vi er i DK igen i morgen
Held og lykke med det
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