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DIY Carbon Fiber Freediving Fins by Vacuum Infusion Build
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- čas přidán 27. 04. 2024
- I've always been interested in building my own gear and composites are one area that I had very little experience with. So I took the time to research the Vacuum Infusion process for Carbon Fiber so take a look at my first go! Of course if you can think of some improvements please comment below. If you want any more description on the process also comment.
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compositeenvis...
Reinforcements:
- Carbon Fiber Fabric UNI Directional Intermediate Modulus 12k 5.7oz/193gsm Hexcel IM2
- Hexcel HiMax Carbon Fiber Fabric Biaxial +45/-45 Degree 12k 2.95oz/100gsm T700 Fiber
- Carbon Fiber Fabric 2x2 Twill Intermediate Modulus 6k 205gsm/6oz Hexcel IM7
Resin:
- RDR-3121 RDH-9386-99 High Impact/High Temp Vacuum Infusion Epoxy 3:1 1.33 Gallon Kit 325° F - 1 hour Pot Life - Kit Size 1.33 Gallon
Consumables:
- Airtech AT200Y Tacky Tape (yellow gum tape)
- Airtech Wrightlon® WL5400 Nylon Vacuum Bagging Film 60" 0.002" (clear film)
- Airtech Bleeder Lease B Coated Peel Ply (green material)
- Airtech Resinflow 60 Resin Flow 60" (red mesh material)
local glass shop
- 1/4" tempered glass
amazon for cheap vacuum stuff
TV Box Cardboard
"Milkman Space Heater" with my own temp control mod SSR with control unit
Processes not shown:
R&D - look at what's out there on CZcams and get an idea for the process
www.easycompos... had the best tutorials
hardest part was getting a feel for the right flex on the blade.
Ended up modeling a few builds that I saw on CZcams and modeling them on ANSYS ACP PRE/POST student addition (another big learning curve) and coming up with a 20N force at a 90 degree bend metric that was the target for a mid flex medium stiffness blade at 29 degree angle. I can make a video on that whole process if you would like. May do some fluid modeling of a flexible foil on ANSYS if I get really ambitious.
Friend, you were the only person on CZcams who had the patience to explain the step-by-step process of making carbon fiber diving fins. The freediving world is grateful for your overwhelming generosity. Success! When you come to Brazil, you have a guaranteed place and diving.
🇧🇷
Thank you for the kind words, I’m glad you enjoyed it
Good job! I make them too. Can I ask you what grams of fabric you used? Thank you😀 @three brothers
I used 200g twill, 200g uni and 100g biax, I’ll try and get the exact materials up on the description in a bit. Thanks!
Excellent video and perfect technique. Everything clean and nice! How you would rate that fins (structure), as soft, medium or stiff? Thank you!
Thank you! My goal of this build was to end up with a medium soft flex with a middle kick point. I spent some time simulating the layup with ansys fea software. The fins I measured before to model off of were medium flex took 20N force to bend to 90 degrees so I iterated my layup design until I had that force and the bend looked good to my eye. I like them they are very flexible but I can put as much power into them as I want and I’m 180lbs. They also have 29 degree angles on them which makes them feel softer. I guess there a medium flex but it is a struggle to find flex values on the internet to compare too.
Friend How did you calculate the total epoxy to use?
The two key measurements you need for this calculation is the total weight of all the carbon fiber in grams and the area of the flow media in square meters. The formula: (grams of CF)/1.5+700*[Flow media area] + 100 = amount of epoxy to mix up. This is for a 60% carbon to epoxy ratio which I believe is preferable and adds on the 700g/meter squared loss of epoxy to the area of flow media fabric and then add 100g for the pot and lines.
does it working as expected ?
is it correct order and length ?
twill 200gr 100cm
UD 200gr 100cm
UD 200gr last 10-15 cm
biax 100gr 100cm
UD 200gr 40cm
biax 100gr 35cm
twill 200gr 30cm
biax 100gr 28cm
twill 200gr 20cm
biax 100gr 20cm
twill 200gr 100cm
Close I think my total length was only 80.75 cm. I can send you a cut list when I see my notes if you would like. I like them. Only thing I would change is how I glued on the water vanes. It needs to be superglue
@@7hreebroes yes. Exact layout would be great. I have all materials except biax 100gr. Need to think how to replace it with something else.
@@AleksejAganin
Full Twill 48x80.75 cm
Full UD 48x80.75
Tip UD 48x11
Full Biax 48x80.75
Upper UD 48x42.4
Upper Twill 48x37
Upper Biax 48x37
Upper Twill 48x32
upper Biax 48x32
Upper Twill 48x26
Upper Biax 48x26
Full Twill 48x80.75
Biax adds only fractional stiffness down the length of the fin and it was so thin it helped dial in the stiffness. I wouldnt go much thinner in the blade but ive made a set where the heal reinforcement was done thinner and they work fine. For this set I wanted some extra protection for the bolt hole. I also added 2.5 cm to the tip and heal cuts for construction that I didnt include in the list.
on the down side, did you apply epoxy or does it still have the peel ply texture? What resin did you use, epoxy?
I left the peel ply texture for that iteration. I’m using rdr 3121 epoxy, actually all of the exact materials I use are listed in the description of the long form video. What’s your opinion of the peel ply texture?