Force Fin Designs

[Bob Evans]

My first Commercial design for pounding Abalone. 1971. Still made in our family foundry in Los Angeles, please think about a Thanksgiving or Christmas gift. Helps support our many projects. Thank you and GOD bless American made products. The Original WhackerSpoon – ChessEvans Gallery and how they are made.

 

[Bob Evans]

Wow when I look back at 1971 holding my 2nd Fiberglass Force Fin design. My partner Andy McMullen took this 35 mm with infrared film, Kodak, while we were attending Brooks Institute of Photography, Santa Barbara, California. Then yesterday with our new high performance polyurethane Force Fin.

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[Bob Evans]

Their has been a good discussion on Vents in fins. I have always been fascinated with this subject having used Jet fins from Scubapro for over 20 years. I really discover where water really traveled working on the Rip Force fin with it's flat blade design. Working on the World's first Split Fin ( coined the name) Foil Force It's the SNAP - Force Fin had to really open up the space in-between to get the water moving from side to side. Here is the Foil Force fin and other later designs opening up between the foils. Plan to get into depth on this subject. but will take time and thought. Fun story and each time I see blended winglet's Engineers - Force Fin

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[Bob Evans]

Some of these early designs will be going up for sale. SOON. Will give small discount to

Scubaboard troops.

 

[Bob Evans]

Venting water was just the beginning of understand water flow. Playing with winglets lead for better results. At this time our Whisker production is not happening, for many reasons. One day

when I have a shop again we can look at the molds and go forward. Good true story. Engineers - Force Fin

 

[Bob Evans]

You can see the gap that was needed to move the water flow over the foils.

 

[Bob Evans]

When I realized venting on fins did not really add up I started to attach winglets on the fins surface. This worked. When flying I always look at at the winglets and think if our Patent Lawyer had filed my idea for aviation and not swim fins I might be singing Dixie......https://forcefin.com/engineers/ Boeing filed two months later.

 

[Bob Evans]

Just a start of a idea.

 

[Bob Evans]

Found these drawings working out venting on the OPS. X-Ray Mag - International Dive Magazine Conversation with Bob Evans - Force Fin

 

[Bob Evans]

The venting for me became a big hole allowing the water to flow up and down quickly to have stabilize the issues of a longer Force Blade. OPS had the ability

of twisting the blades to change performance output. X-Ray Mag - International Dive Magazine Conversation with Bob Evans - Force Fin