When I saw the set up, I was wondering how it would affect fin flex.
Can you add/use flexible spacers? Maybe rubber rubber rods/cylinders or rubber hose/tubes for spacers? With flexible tubes/hose you could vary wall thickness to adjust flex -- play with diameter too.
Swaylocks Surfboard Design Forum: thoughts & theories ... practical & theoretical
RAIL PROFILE http://bgboard.blogspot.com/2014/03/march-82014-afterr-seeing-recent.html
Bill, I think that would be a better way to continue, with flexible connectors between the blades. Need more water testing.
Still experimenting with fin/ flipper design as well as many other things.
A fin needs to have area, stiffness and a solid connection with your feet to allow the instant transfer of energy from hip-leg-knee-ankle-foot-toes then flipper to water.
The last version with a split level setup had propulsion but it wasn’t smooth like the big Voit Duck Feet on the left. They’re the best at getting forward movement, IMHO.
The middle ones are highly regarded but don’t have the area or stiffness for instant giddy up when you really need it. They can twist on my foot because the pockets not rigid enough or maybe I have little girls feet.
so I’m back to the modifications, but this time the addition is on the same plane as the flipper blade. The 2 on the right are the top and bottom view of the latest creativity.
The push from a kick seems to be mainly on the down stroke with the up stroke being more or a reset stroke so I’ve attached the additional blade to the top of the original blade so it’s strongest on the down stroke.
It’s just 5 mm ply with paint to waterproof it for testing.
What the hell? You’re making flipper now too? I cannot keep up. Foils, mats, flippers. You’re shamming me.
all the best
Personally I'm always ready to learn, although I do not always like being taught. - Winston Churchill
Greg, the creativity covers a wide field, Including building my own backyard pool, a few medical items, shaping shed, house extension, decks, underwater breathing system, dining table, fishing lures, child’s safety swing seat, handplanes, a wheelchair, pram slide for steps, and a ton of things I’ve forgotten.
So I trimmed 3/4 in of the end width and they’re easier to use, too wide and they hit each other when youre kicking.
Another thing I dislike in flippers is not enough toe room.
Ive got Schrek Feet and when there’s not enough toe room my nails get ripped apart.
im thinking that the most comfortable flippers would have open toes and while some commercial flippers do and don’t have open toes, it’s probably more about their method of manufacture than comfort. You can see how many different companies are made in the same factory by the samples behind the woman in the video below.
Interesting you're adding on to fins. I'd just get those long diving flippers and practise slow kicking. Holes and bolts in fins always seems to lead to tears.
I know wave catching requires quick bursts of speed from fast kicks, but I'm not convinced that bigger/stiffer fins are that much help. I'm 59 and have been kneeboarrding over 45 years.
Personally I gave up on Churchills, Voits, etc. years ago. I get the cheapo swim fins, cut out the heel, add a loop of string for fin tethers and trim the blade curved at the front and grind the edges down. I'll post pics.
I’d like to see what you do to the flippers please.
From my experiments I’ve found bigger area and more stiffness creates lot of resistance to the downward kick, the upward kick is more of a Reset than a useful stroke, especially if you’re only able to kick from the knee and not the hip.
The Voit Duck Feet were the best so far with a larger blade than most, all the smaller ones were less effective. The soft silicone ones had all the fancy side flanges to stiffen the blade but theyre still too sloppy.
The foot pockets were where the designs make a difference, they all have a lot of room for your toes and any pocket that touches your toes tends to wear and you naturally cramp your toes to push if your toes can touch the pocket. The heel straps are all about the same design with a bigger cutaway under your foot than on top.
Your foot is held in the pocket by the top and bottom of the pocket, on the DaFin the top is quite thin and I felt the fin wasn’t delivering the kick I was giving. Even with the rubber flippersbeing stiffer most had side panels along the fins for more control and to hold the water during each stroke.
The design of current flippers is due to the manufacturing process and materials so I working on making a glass version that should give me the ability to control the flex and a comfort fit.
I'd be interested to see your pics + the tethers. I have experimented with different cords and knots a bit.
Flippers are such a personal thing. I also come back to Churchills but the fit is terrible and the rubber much harder. The stiffer duck feet are also heavier - great for the conditioned legs but agony if out of shape. How do you find adding to the fins - ever hit bottom or anything else, with them. I have plenty of reef and rock scrapes.
WoodDave, no directional control but I’m addressing that with the next pair of flippers.
Bob, no contact with reef at all. You know how some people are lucky in love or always happen to get the best deal. I’m the guy that never hits the reef. Having said that I’ll probably get flogged and cheese grated tomorrow.
All the commercial fins are pressure molded so they have to bulk up to create rigidity but I’m using glass so I should be able to make flippers that are much lighter with flex and swap in other materials for a perfect fit. I’m thinking a rubber heel strap but with a silicone foot pocket for comfort.
I also want to see how I can turn up the sides to direct the water straight out the back when you kick as well as providing some real direction hold and control for your feet.various brands talk about it but I’m not feeling the control as advertised. Maybe have the blade sides 2 or 3 inches high, but Flippers with real hold would revolutionise body surfing.