OPS Fins – a 20 year old fantasy fulfilled

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TN Traveler

Contributor
Messages
1,553
Reaction score
456
Location
Knoxville, TN; St Croix, USVI
# of dives
500 - 999
OPS.jpg


About 20 years ago I watched an episode of the crew of the Calypso in their exploration of the ocean. What I noticed was the fins they wore (along with the streamlined tank backpacks) – they were a long, thin and moved like no other fin I had ever seen. It appeared that the divers were exerting minimum effort but moving much faster than I had ever seen.

Move forward several years and I discovered Force Fins. I have a wide foot with a narrow heel and low ankle bones, so almost all standard open heel fins cramp my feet and full foot fins fall off or rub my ankles. They were the first fins that I had found that fit my feet and allowed me to do extended dives without discomfort. I tried numerous styles and had settled on Tan Delta Excellerating FFs until Bob allowed me to test a pair of the “new” Hockey Fins, made with a new material that provided better performance with less effort (and exceptional performance under high current conditions) - these then became my "go to" fins.. Over the next couple of years Bob and I became friends and have even worked together on his Underwater Desalinization Project.

I admitted to Bob that I had wanted to get a pair of the OPS blades to go with his Launch Pad Foot Pockets since watching the Cousteau documentary but Bob said that he did not have any – they had made only a limited number of them and all had gone to Underrwater Futures Society (Michel Cousteau’s group) for the crew. He said he might have some Launch Pad Foot Pockets and some odd blades but nothing matching and besides they were all packed up and in storage.

Fade into a couple of months ago and Bob announced that he was going to clear out the storage area. I told Bob that if he came across even a mismatched pair, I would still like to try them – and he told me that there was probably little hope but if he found a matching blade and pocket, he would send it to me for my office wall. Well a week and a half ago, when Bob announced that the storage area was now empty and he had started selling off some of the “stuff” in there like mold parts and some fins, like the SD-1’s, he called me to tell me I had a package on the way. He said there was one of the original FF molds – for my office wall and a set of OPS fins.

They arrived the day before we were heading to St Croix, so all I had time to do was quickly pack them into a suitcase but I did notice that they matched. Well, the day after we arrived, I got them out of the suitcase and found they were a matching set of Blue (well one blue and one blue-green) Tan Delta blades and foot pockets. Needless to say, they were quickly assembled and into the pool I went. The pool is only 25 feet long but I could easily feel how the fins performed. You quickly develop a rhythm that matches the fins and maximizes the performance. I could not wait to get them in the ocean – so the next morning we headed for the beach to at least try them snorkeling. I have never liked any Force Fins except the Rip Force for snorkeling/surface swimming – but the OPS blades performed much better than I expected. The only problem was I had to keep stopping to let my wife catch up (and I was expending almost no energy). Heading into the current was no different than riding the waves back to shore. Next week – off to the Pier to dive.

Normally when you have a dream and finally get the chance to fulfill it, the reality does not match the dream. Only 3 other times in my life has the reality exceed the dream – 1) marrying my wife, 2) Driving a Shelby Cobra on the track, 3) Driving a Ferrari on the track – now I have 4.

THANKS BOB!!!
 
Lucky you ! :wink: Brings back nice memories, when 3 years ago I got my hands on a pair of Force Fin Pro... Waited almost 20 years for that. :D
 
@Bob Evans

I'm curious ... As I understand it, the OPS series foot pocket/base and fin-blades are interchangeable. I see great advantages for both the manufacturer and the customer.

As a manufacturer, decoupling the base/foot-pocket from the fin-blades allows you to make fins that support "X" fin-blade variants in "Y" base/foot-pocket variants with X+Y total (smaller, possibly more-complex) molds instead of X*Y larger molds. If the units are stocked separately you can play interesting tradeoffs between reducing total stock volume and/or larger runs of the components, while maintaining availability of all combinations to meet customer demand.

As a customer, it lets me configure my fins between differing foot-gear (base/foot-pocket - bare, wet-boots, dry-boots) and missions (fin-blades - reef-bimble, cave/penetration, high-current, free-diving, etc.)

Both
- separability makes for more compact package for shipping/travelling
- upgradeability makes the cost (retail and manufacturing) less when there is a need to change for fitment or desire for different capabilities while providing a customer-incentive to remain in the product line.

Maybe I missed where this "model" got orphaned in your history, but it seems like a good match for your (highly-creative) niche.
 
@Bob Evans

I'm curious ... As I understand it, the OPS series foot pocket/base and fin-blades are interchangeable. I see great advantages for both the manufacturer and the customer.

As a manufacturer, decoupling the base/foot-pocket from the fin-blades allows you to make fins that support "X" fin-blade variants in "Y" base/foot-pocket variants with X+Y total (smaller, possibly more-complex) molds instead of X*Y larger molds. If the units are stocked separately you can play interesting tradeoffs between reducing total stock volume and/or larger runs of the components, while maintaining availability of all combinations to meet customer demand.

As a customer, it lets me configure my fins between differing foot-gear (base/foot-pocket - bare, wet-boots, dry-boots) and missions (fin-blades - reef-bimble, cave/penetration, high-current, free-diving, etc.)

Both
- separability makes for more compact package for shipping/travelling
- upgradeability makes the cost (retail and manufacturing) less when there is a need to change for fitment or desire for different capabilities while providing a customer-incentive to remain in the product line.

Maybe I missed where this "model" got orphaned in your history, but it seems like a good match for your (highly-creative) niche.
Not sure how to respond, my friends can do a better job than than me. appreciate views.
 
I will try to answer the questions honestly and not upset the man. I apologize up front as this is going to be a long-winded answer, but I hope my explanations add value to understanding.

The OPS foot pocket is extremely comfortable, the open top makes the foot connection more flexible and you get a great, no hotspot fit. I however only like it with a neoprene bootie, or more commonly a comfort instep while barefoot. This open top is also found on the Flying Force (my go to warm water fin)

The OPS blade is beautiful, I did find the blade easy the kick, like a soft long blade free dive fin. It lacks the immediate response that I get from a Pro and it would not do the advanced 3 beat pause flutter, helicopter, or back kick.

Now to the heart of the question. I was able to use multiple blade designs and tested side by side (literally on each foot) a standard design and its' OPS counterpart. Force Fins function through loading the blade and the "snap" rebound. What I found with the OPS pocket was a couple of things I did not like.

First- the flex profile of the blade is interrupted by the joint
Second- the “snap” rebound was lethargic and the blade felt dead

To expand/explain, if you closely examine an Excellerator you’ll notice a rib shape and a tapering tip (easiest seen on a TanDelta). Bob did this to allow you to activate just the tip for finesse, or drive the whole fin for power. If you examine a Standard ForceFin you’ll notice the blade is not a uniform thickness, again Bob used his sculpting mind and skills to control the flex of the fin and create flex zones and stiffer zones to channel water effectively rearward. Anything that interrupts this flex profile will detract from the feel and performance. The joint was effectively rigid creating a flex zone above and below the joint with a dead zone in the middle. Overall, I personally am very glad Bob did not go modular. Sure enough time/money materials he probably would have solved the problem, but then he would probably have a $4000-$5000 fin that he couldn’t sell and I doubt would be as good as the original.
 
I cannot make any judgement about the OPS blade being able to do a variety of kicks. The little time I have spent with the fin in the water has mostly been doing a simple flutter kick and it is outstanding in that use. I just started playing with the adjustment by rotating the outer ribs and can feel that it does change the feeling of the fins - not sure how it will work outside the pool or with different kicks. I have found that they will do enough of a back-kick that will allow me to hold position for taking photographs - which is all I need.

Since my diving is now done on simple, shallow sites, any lack of versatility is not important to me. Mostly at this stage of my diving, I need a fin that is comfortable, easy to kick and provides enough power when required to handle occasional currents (or catch a turtle or dolphin)..

After assembling the blade and foot pocket, it was obvious that making changes in blade orientation is not quick/easy. You have to partially unscrew the blade and then rotate it - then retighten. Bob had talked about engineering a way to make this connection in a way that quick adjustment was possible (something like whiskers on Excellerating and Extra FFs) but we never got that far once he was forced to close the California manufacturing operation.

One thing about the foot pocket/blade connection - it is complicated. There are a series of "teeth" on both pieces that are difficult to mold and probably take considerable clean-up to insure proper mating.. (Next time I take the fins apart, I will take a picture)

Also I cannot imagine the OPS blades being made in anything but the Tan Delta Material - they would be too heavy (they are not light now) in normal urethane. They also need the "snap" that the Tan Delta material provides. Other blades made in standard "pro" urethane would probably be fine. I think Bob determined that the fins would cost more than most people would pay (just look at all the "sticker shock" for any Tan Delta fin) - I would imagine that foot pockets and OPS Blades would have had to retail for close to $1000.
 
I will try to answer the questions honestly and not upset the man. I apologize up front as this is going to be a long-winded answer, but I hope my explanations add value to understanding.

The OPS foot pocket is extremely comfortable, the open top makes the foot connection more flexible and you get a great, no hotspot fit. I however only like it with a neoprene bootie, or more commonly a comfort instep while barefoot. This open top is also found on the Flying Force (my go to warm water fin)

The OPS blade is beautiful, I did find the blade easy the kick, like a soft long blade free dive fin. It lacks the immediate response that I get from a Pro and it would not do the advanced 3 beat pause flutter, helicopter, or back kick.

Now to the heart of the question. I was able to use multiple blade designs and tested side by side (literally on each foot) a standard design and its' OPS counterpart. Force Fins function through loading the blade and the "snap" rebound. What I found with the OPS pocket was a couple of things I did not like.

First- the flex profile of the blade is interrupted by the joint
Second- the “snap” rebound was lethargic and the blade felt dead

To expand/explain, if you closely examine an Excellerator you’ll notice a rib shape and a tapering tip (easiest seen on a TanDelta). Bob did this to allow you to activate just the tip for finesse, or drive the whole fin for power. If you examine a Standard ForceFin you’ll notice the blade is not a uniform thickness, again Bob used his sculpting mind and skills to control the flex of the fin and create flex zones and stiffer zones to channel water effectively rearward. Anything that interrupts this flex profile will detract from the feel and performance. The joint was effectively rigid creating a flex zone above and below the joint with a dead zone in the middle. Overall, I personally am very glad Bob did not go modular. Sure enough time/money materials he probably would have solved the problem, but then he would probably have a $4000-$5000 fin that he couldn’t sell and I doubt would be as good as the original.
I did make several foot pockets working on that flex zone, but I found your drawings yesterday, kind of weird timing, showing me how to connect like gun attachment. Will scan since I did not toss out...thanks. Really none of this really matters at this point, it was a fun project and had hoped to finish.
 
I hope was not too negative on the OPS fins, these fins are lightyears ahead of anything else on the market, they are just not my favorite fins. I've a stable of FF in the back that I know and love.
 

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