That doesn’t solve the problem of people using electric bikes outside of the assisted class races…
Chinese authorities say they shut down 30 million tons of steel production capacity last year. That cut alone is equal in size to the annual output of the No. 9 producer, Brazil, but only a sliver of China’s 800 million tons.
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Induction reflow is sometimes used when soldering metal parts, including connectors, so I have some doubt about [RandyKC]’s assertion that “Only reason solder melted was due to the container”. Also, the screwdriver that [Proto G] inserted into his coil certainly got hot, so I don’t see why the same thing wouldn’t apply to solder (hey [Proto G], stick a piece of solder into it and end this debate). However, I suspect that the induced currents and heating would be fatal for lots of more sensitive components ([Proto G], ditto). Without careful control (which is perhaps impossible anyway), this is going to very quickly take some things far above soldering temperature.
I’d go with pneumatic turbine and pressurized frame filled with compressed gas. Add to it a mechanical valve that opens when torque on bicycle pedals increases. This way it will add torque only when needed most…
Customer-driven requirements mandated that the size and shape of the new laser-based system fit within the fixed envelope of the current heating systems. Laser energy delivered via fiber-coupled laser diodes were initially considered—these types of diodes deliver light from the semiconductor diode via a flexible passive-core fiber. To achieve the necessary optical energy distribution across the processing area, secondary optics would also be required. Given the volumetric constraints of the heat source and the desire for higher electrical-to-optical efficiency, the use of fiber-coupled laser diodes was rejected. Using attached micro-optics for collimation, free-space direct diodes provide the desired beam divergence while providing an electrical-to-optical efficiency over 60%. The final system design includes four tap-water cooled T6 diode stacks from Lasertel (Tucson, AZ)—the T6 laser diode heat source is shown in FIGURE 3. The T6 stacks were chosen because they were the only laser packages that would produce the power level required while fitting into the available physical space. The customized spacing between the bars was configured so that up to 2000W of optical power could be evenly distributed across the work surface. The electrical path was configured to allow each stack to be powered individually based on the number of prepreg tows being processed. The composite material temperature is actively monitored by the system and a closed-loop system controls the current to each diode, allowing for the power to be adjusted accordingly. The laser system delivers heat in a focused area and allows quick on/off operation.
have you seen old saltwater resistive dimmers? they used to use them in theaters, basically steel rods in a triangle or inverted v, with the resistance increasing as you lift it out of the water.
Magnetism adds in superposition, so from any individual point there is only 1 value of magnitude and direction, no matter which direction you look in.
Michael – Use your favorite word processor like a HaD posting pre-processor. Use it to check your spelling, reformatting, and sanity-checker. THEN do a CTRL-A, then CTRL-C, return to the HaD blank field, click in it and hit CTRL-V, and only then hit (POST COMMENT). Remember only 1 hyperlink per post to avoid moderation. Or just cripple your links with spaces. Have a Google window up to check your facts too. Use Google’s define:word function to avoid using wrong word to describe something. The HaD grammar-police will pounce on you. Think about using GRAMMARLY.Its free and I think it may do about 90% what I said above. Or not…
The wing and feather are both carbon fiber composite sandwich structures, built from the same materials and process as the WK2 wing and the fuselage sections. The feather consists of a set of small wings called the feather flaps that are attached to the wing at its aft spar by four metal clevis-and-lug fittings that allow the flaps to hinge up and down (Step 6 and Figures).
“Some individuals have reported that they experience non-specific symptoms upon exposure to RF fields emitted from base stations and other EMF devices. As recognized in a recent WHO fact sheet “Electromagnetic Hypersensitivity”, EMF has not been shown to cause such symptoms. Nonetheless, it is important to recognize the plight of people suffering from these symptoms.”
The second half of the SS2 includes what TSC calls the feather, which is part of the wing structure. After SS2 has released from WK2, and after its rocket has burned out, SS2 achieves the apex of its flight. At this point the pilot pneumatically actuates the feather to its folded-up position, from 0° to 90°‚ (Figs. 4 and 5), to increase drag and reduce speed for re-entry into Earth’s atmosphere. If the spaceship were re-entering Earth’s atmosphere from low-Earth orbit or higher, a different technology would be required to withstand greater heat and g-forces associated with re-entry from those altitudes. At SS2’s re-entry point from the edge of space, though, the feather is a sufficient and inventive way to safely slow the descent. (Following a deadly accident due to premature feather deployment during a test in 2014, TSC redesigned the system to prevent a repeat of this failure.)
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