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  1. [DIY] The "Stradivarius": A 1300Hz Cybershape made with True Violin Woods (Maple/Spruce) & Hide Glue

    You are correct, in my head I just read "pre-stressed" but you did use the term pre-tensioned. Pre-stressed concrete has two categories: pre and post tension. I just defaulted to post-tension... Anyway, it's a delicate balance. If you successfully tension the fabric, it wants to return to its...
  2. [DIY] The "Stradivarius": A 1300Hz Cybershape made with True Violin Woods (Maple/Spruce) & Hide Glue

    The pre-stressed concrete analogy doesn't really apply here. In a pre-stressed beam the tendons run inside of sleeves. Their are tensioned before the concrete is poured, then capped at the ends and released after the concrete has cured. This creates compression, making the concrete stronger...
  3. SDC Handmade Blades

    Not ignorant at all. It's the wood, I veeeery rarely do joint top plies, actually I think I've only did it once.
  4. SDC Handmade Blades

    I don't think I would be able to name them all correctly if I saw this photo, there's some tricky ones! 😅
  5. SDC Handmade Blades

    Maybe! 😂
  6. Calderano Signs with Joola (#139)

    I've made a few blades for pros, not many. It's not that interesting actually, if the player is sponsored then he cannot advertise he is using my blade, and I can't do it too, so it does nothing other than inflate my ego 😅. I've also made some repairs and handle swaps for pros. You have several...
  7. Calderano Signs with Joola (#139)

    Chill... Hugo, and all of you, can just buy custom blades from me. Then everyone will feel special! 😂
  8. SDC Handmade Blades

    Finished the last batch of blades of 2025, getting them ready for shipping. Roughly 200 blades later the cycle ends, a new one will begin. It's been another tough year, a lot of work, some health issues, but many good things too! Hopefully, 2026 will bring new and better things to SDC, so that I...
  9. SDC Handmade Blades

    #1357 - 11ply - DEF Probably a world's first, eleven Koto plies. The goal was a very stable defensive blade, feels very similar to the Goriki, which has the same philosophy, but perhaps a tad crisper. - 11x Koto - 102.6g - 5.4mm - 165x155mm - ST (100x23.7x29.3mm) - Balance: 3.7cm (High)
  10. Is there a subjectively perfect weight to every blade?

    Sure, two blades is not a problem. So, ALC ("Arylate-Carbon") and AC ("Aramid-Carbon") are very similar, they both belong to the Aramid family of fibers. "Arylate" is just Butterfly's trademark name for Vectran, which is the real name of the fiber. In my specific case I'm also using Kevlar...
  11. Adding a Koto Outer Ply to the FH of blade?

    Making an asymmetrical blade from scratch is not the same as modifying an existing blade. Sure, it's possible to achieve different speed and feel between sides, but there are many restraints and you have to know how to make them. You cannot isolate the stiffness between sides, and stiffness is...
  12. SDC Handmade Blades

    For those wondering why it takes so long... 11 blades, 4 customers. No line work, very little common ground between them. I make everything from scratch, there are no pre-set recipes, no handles bought somewhere else to make it easier. Each one of these blades was exhaustively discussed with...
  13. SDC Handmade Blades

    When you first cut the shape of the blade, and it does not have the handle pieces on, the blade is free to bend along all of it's length. If you measure the frequency at this point in the build process, it will be a lot lower than when the blade is finished. When you glue the handle pieces, you...
  14. SDC Handmade Blades

    #1347 - Outer Ax-C - OFF Ax-C is like the poor man's ZLC. It's a Aramid-Carbon fabric, but due to the weave pattern with vertical carbon and horizontal Aramid, it has more in common with ZLC than A-C. However, since Aramid is a bit softer than Zylon, you end up with a slightly slower and crisp...
  15. SDC Handmade Blades

    #1344 - Asymmetric Inner/Outer - OFF- Normally I don't make blades just for the sake of being different, my blades usually have a purpose and looks are secondary. This one also started with a purpose, to be a fully asymmetric blade, down to the core, which makes it one of the most unique blades...
  16. SDC Handmade Blades

    It's like a step down (speedwise) from the HAL, but a more fair comparison would actually be the SAL, since they both use an Ayous core. Overall it's still less stiff because Limba is flexier than Koto, and the Kevlar fabric used here is thinner (lower density). No difference. The handle is not...
  17. Is there a subjectively perfect weight to every blade?

    I think Zeio is right on point with his answer, when it comes to the rubber+blade combination. For the bigger/smaller halls question, I would also say it's due to auditory/sensory perception. I play very badly when I cannot hear the ball correctly, and even the racket doesn't feel the same. It...
  18. SDC Handmade Blades

    #1343 - Outer Kev - OFF- I rarely make blades with very thick cores, this type of blade is not easy to make in the sense that, because the core is so thick, it plays a very important role in the feeling of the blade. In theory, using a thick core and thin outer layers, is the most effective way...
  19. SDC Handmade Blades

    Thickish... 0.75mm Considering I've made blades with 170x163mm I wouldn't call it very large 😅. But yes, it's a more Fh oriented blade.
  20. SDC Handmade Blades

    It had a less denser core yes, but a little denser medial plies too. With the fiber being different as well, it would have felt a bit different from your blade.
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