LDMM 

Short for long-distance mutual masturbation. Usually achieved by masturbating to the same porn as your partner when you're miles apart.

I miss seeing my boyfriend, but we had some amazing LDMM last night.

LDMM by darkangel83 June 10, 2018

Long-Duration Motion Machines of the Third Kind (LDMM3)

Devices focused on eliminating friction to the maximum possible extent—the purest expression of the "long-duration" philosophy. LDMM3 aren't concerned with energy sources or thermodynamic cycles; they're obsessed with removing every last bit of resistance. Magnetic levitation in vacuum, superconducting bearings, quantum levitation—these are LDMM3 technologies. They don't create energy; they just refuse to waste it. Friction is the enemy, and LDMM3 are the ultimate war machines against it. With friction reduced to near-zero, motion continues for timescales limited only by cosmic background radiation or quantum effects. LDMM3 is what happens when tribologists (friction scientists) achieve nirvana.

Long-Duration Motion Machines of the Third Kind (LDMM3) "That magnetically levitated flywheel in a vacuum chamber will spin for decades on a single push. That's LDMM3—friction eliminated to the point where 'stopping' is just a theoretical possibility. It's not perpetual; it's just pathologically opposed to slowing down. Friction is the enemy, and LDMM3 won."

Long-Duration Motion Machines of the Third Kind (LDMM3) by Dumu The Void March 1, 2026

Long-Duration Motion Machines of the Fourth Kind (LDMM4)

The comprehensive approach: devices that simultaneously respect all laws of thermodynamics while eliminating friction to the maximum extent—the ultimate expression of long-duration motion engineering. LDMM4 combine the energy storage optimization of LDMM1, the entropy-slowing strategies of LDMM2, and the friction elimination of LDMM3 into a single system. They're not violating physics; they're just exploiting every possible loophole to make motion last as long as physically possible. A supercooled, magnetically levitated flywheel in perfect vacuum, isolated from cosmic rays, spinning on energy stored once at the beginning—that's LDMM4. It will outlast human civilization, maybe the planet, maybe the star. LDMM4 is what you build when you want something to move longer than anything has ever moved before.

Long-Duration Motion Machines of the Fourth Kind (LDMM4) "They're designing time capsules that will spin for millions of years using superconducting magnetic levitation in deep space. That's LDMM4—all the laws respected, all the losses minimized, all the friction eliminated. It won't move forever, but it'll move longer than you can imagine. LDMM4 is the closest we'll ever get to eternity without cheating."

Long-Duration Motion Machines of the Fourth Kind (LDMM4) by Dumu The Void March 1, 2026

Long-Duration Motion Machines of the Fifth Kind (LDMM5)

The most advanced category: devices that achieve long-duration motion by operating within complex dynamic systems—harnessing planetary orbits, gravitational fields, or cosmic dynamics to sustain motion over astronomical timescales. Unlike earlier kinds that fight dissipation locally, LDMM5 work with systemic energies—riding gravitational waves, exploiting orbital resonance, or tapping into cosmic background energy in ways that don't violate thermodynamics because they're part of larger systems. A spacecraft using gravitational assists to maintain trajectory for billions of years. A satellite that harnesses solar wind to counteract orbital decay. LDMM5 are the ultimate expression of working with the universe rather than against it—motion sustained by the dynamics of the cosmos itself, not just isolated engineering.

Long-Duration Motion Machines of the Fifth Kind (LDMM5) "Those Pioneer probes are still going after 50 years, but they'll eventually slow. LDMM5 would be something that uses gravitational fields to keep moving indefinitely—not perpetual motion, just motion sustained by cosmic dynamics. It's not a closed system; it's an open one, sipping energy from the universe's motion. LDMM5 is what happens when engineers stop fighting the cosmos and start surfing it."

Long-Duration Motion Machines of the Fifth Kind (LDMM5) by Dumu The Void March 1, 2026

Long-Duration Motion Machines of the First Kind (LDMM1)

A class of devices designed to maintain motion for extremely long periods—thousands of years or more—by optimizing energy storage and minimizing losses, while respecting the First Law of Thermodynamics (energy conservation). Unlike perpetual motion machines (which claim to violate physical laws), LDMM1 acknowledge that energy must come from somewhere; they just store it so efficiently that motion continues far beyond human timescales. Think of a flywheel in a perfect vacuum, on frictionless bearings, spinning for millennia on the energy you gave it once. LDMM1 don't create energy—they hoard it, releasing it so slowly that "long-duration" means geological time. They're possible because the First Law isn't violated; energy is conserved, just doled out over eons.

Long-Duration Motion Machines of the First Kind (LDMM1) "That clock they built in 1986 is still running on its original battery? It's not perpetual motion—it's just really, really efficient. That's LDMM1: store energy once, release it over centuries. Not magic, just engineering so good it looks like magic to anyone who's ever changed a smoke detector battery."

Long-Duration Motion Machines of the First Kind (LDMM1) by Dumu The Void March 1, 2026

Long-Duration Motion Machines of the Second Kind (LDMM2)

Devices designed for extreme-duration motion by optimizing against the Second Law of Thermodynamics—not violating it, but approaching its limits asymptotically. The Second Law says entropy increases; LDMM2 fight entropy by creating near-perfect isolation from dissipative processes. They don't reverse entropy; they just slow its increase to a crawl. A supercooled ring levitating in vacuum, spinning for thousands of years—that's LDMM2. The energy gradually dissipates, but so slowly that human civilization could rise and fall while it's still spinning. LDMM2 are the thermodynamic equivalent of putting your leftovers in a freezer that lasts millennia: entropy still wins, but it takes its time.

Long-Duration Motion Machines of the Second Kind (LDMM2) "They've got gyroscopes in space that will spin for thousands of years before slowing down. That's LDMM2—not defying the Second Law, just making it work overtime. The universe still wins, but it has to wait. LDMM2 is what happens when engineers decide to play the long game against entropy itself."

Long-Duration Motion Machines of the Second Kind (LDMM2) by Dumu The Void March 1, 2026