Reversing Entropyvideo
Had to Reinvent the Sailing Block (To Replace Them All)
February 22, 2026 · 16 min · 244K views
Hands assemble silver sailing block with red-and-white rope
What this video covers
A custom-designed, modular sailing block serves as a universal replacement for various standard deck blocks, including snatch, stanchion, and sheave configurations.0:02 The unit features a CNC-machined 5083 H111 aluminum body and a polyamide 6-6 (nylon) sheave, chosen for its self-lubricating properties and impact resistance.4:28 Designed to be stackable, the blocks can be combined to create multi-purchase systems or multi-way lead blocks using standard hardware.13:02 The design accommodates lines up to 14mm and remains compatible with both stainless steel shackles and Dyneema soft shackles.12:28 To prevent patenting by third parties, the creator released the technical CAD drawings into the public domain as defensive publication.1:41 Testing against commercial alternatives showed the block maintains structural integrity under loads exceeding three tons, with the sheave resisting deformation better than traditional ball-bearing models.11:14 The creator intends to use these units as primary gear for an upcoming ocean crossing, noting that regular application of Tefgel or marine grease is necessary to mitigate galvanic corrosion between the aluminum body and stainless steel fasteners.15:11
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