pure freediving carbon fins

[qai4321]

Hi guys. Im doing a bit of research on which carbon fin to buy. So any opinions on which carbon fin is best suited to straight up and down freediving would be appreciated. Im also curious about blade lengths and sizes.

Is it prefrable, for example, to use no blade/little blade angle if im not planning any surface swimming?

It looks like the longer the fin, the better the performance ( again just straight up and down) but how much is too much fin.

Finally, ive seen some posts where people say the fin was too stiff for surface swimming but they shot down and up with them. Is stiffer better for depth attempts?

Looking forward to your views

 

[cid]

As other have said, the key is blade stiffness. you want a stiffness suitable and proportional to your muscle strength and body weight. Blade angle, material and length are less important.

In my opinion if you have a high amplitude/low frequency kick then longer fins are better, while if you have a low frequency/high amplitude shorter fins are better. That's because you want the fin to recover from bending while you are making the transition from kicking front to back or vice versa. Short fins recover faster.

Blade angle is good in my opinion, it makes surface swimming easier but also takes pressure away from your ankles for vertical finning. I don't know what happens when you have too much angle, but I love the 25 or so degrees that my blade has. It might be a matter of personal preference?

Finally for deep diving you don't necessarily need stiff blades. Sure stiff blades have more acceleration and top speed, but at the cost of comfort and efficiency. Deep diving come with time and practice... every year of practice a few more meters! :blackeye