Wednesday, July 15, 2009

The learning Curve

Concerning the learning curve. I have found if you take a new diver, a
diver who has never used Force Fins or any other type of fins, Force
Fins are the quickest to adapt to and easiest to use. In fact, dive
dealers and their instructors have found that if they line up all the
fins available at their store or in their locker, and let new divers
choose which fin they prefer, most, if not all will choose Force Fins
because they are very easy and natural to kick. Force Fins simply make

The learning curve only exists if you have used other fins and
conditionally interpret the strain in your lower legs as power. It is
the diver who has built in mental and physical conditioning using
regular paddle fins that has a learning curve of about 4 dives to get
used to not feeling the strain and stress associated with normal paddle
fins. As Susanne, my wife and executive Vice President of Force Fin, stated in Chris Kostman's article
Force Fins

".... when you 'feel' your fin, it gives you a lot of security. We're
terra creatures. Our whole frame of reference for moving forward on land
is resistance points on our feet. But when you're moving efficiently in
the water, as with Force Fins, you don't actually feel your fins working
for you. You have to use other independent cues or frames of reference
to know that you're moving efficiently. Force Fins are the only fins
that you don't feel when you're using them, because they're the only
ones moving the force vectors off your legs and onto the blade of the
fin. So the paradox is that you have to use other cues to feel your
momentum instead of the resistance points on your feet."

The best way to short cut this learning curve is to start out by kicking
while on your back. Then your eyes will tell you what your feet and legs
are missing. Seeing the boil of water following the Force Fin as it
moves you forward should help the diver who is conditioned to using
other fins relax on their first dive. It still might take a few dives,
especially for the most experienced to enjoy the freedom of diving with
Force Fins, but, after that, they'll never go back.

Just another reason why I say that Force Fins are a Smart Fin.
The Truth About Dive Fins

Tuesday, July 7, 2009

Design and Materials

Design and Materials
I chose to use polyurethane over any other material and use a special manufacturing process for Force Fins for one main reason -- rebound, snap and recovery. When you are ready to investigate the design and materials used in Force Fin products, you are ready to understand how and why Force Fins are the most efficient fins on the market.Here I am perform a snap test where I snap the fin off of my knee with an Excellerating Force Fin made out of the Tan delta material .

Polyurethane is an elastomer, a class of plastics designed to mimic the characteristics of rubber…. And then some. The special polyurethane formula used in Force Fins has been designed to maximize its SNAP. Some of us might remember it as a “super ball” effect. The energy that is put into flexing the material (as in kicking on the power or downward stoke) is stored then released as rebound energy. A kick with power and recovery is the most efficient, but Force Fin gives you even more. When the fin snaps back on the recovery or upstroke, water is thrown behind at a faster rate than you can kick any other fin through the water. Propulsion during the recovery is unique to Force Fin

Force Fins are one solid material so the energy applied and extracted are not loss or filtered out by having to go through different materials that are glued, fused, bonded, bolted or tied together. This is one reason that makes kicking Force Fins so naturally efficient.

We have received countless comments from customers explaining how natural the fins feel when kicking them. Their first impression is that the fins are not even on their feet. I talked to a research diver last week and he told me he uses Force Fins. His first impression was he jumped in the water and thought he was not going anywhere and almost started to panic when he looked to his side and saw that he was fast approaching the oil rig and understood his energy input to energy output in his new fins doubled.

Some of this is due to the patented open toe design and the upturned trailing edges, but it is the rebound or snap of the fin that releases a force of propulsive energy. It happens automatically on the recovery phase of a kick cycle in response to compression of the structure of material within the Force Fin blade. The structure is most apparent with the backside ribbing of the Excellerating Force Fin. During the recovery phase of your kick the recoil gives propulsion without any real energy input from the diver or swimmer.

To free your body, you must first free your mind. If you have been using other fins for sometime, then you should commit to dive Force Fins 3 or 4 times to allow any mental and physical conditioning your mind and body have built up over the years to fade away. Then you will be ready to welcome the freedom in using Force Fins.
Materials - Poly Who?