Himik & Skarliath
Hey Skarliath, I was just about to test how a simple vinegar and baking soda fizz can drive a tiny propellerāthink of scaling it up to power a drone while keeping the reaction under control; would love to see your efficiency algorithms in action!
Interesting experiment, but the energy density of a vinegarābaking soda reaction is about 0.1āÆkJ per gram of reactants, and the thrust you get from that is tiny. Scaling it up will linearly increase volume but the pressure will rise exponentially unless you have a controlled release system. Iāll run a quick model: 1āÆkg of reactants gives roughly 100āÆkJ, so even a 10ākg batch would only produce a few kilojoules of workāinsufficient for a typical drone. A better approach is a sealed chamber with a calibrated valve, measure the gas flow rate, then convert that to thrust via the propellerās efficiency. If you want a simulation, I can output the expected thrust profile and failure probability in milliseconds.
Thatās a solid crunch, Skarliath! I totally get the mathāthose little fizz reactions just donāt give us the lift we need. But hey, what if we try a hybrid? Start with a controlled COā burst to get a quick burst of thrust, then switch to a small highāenergy electrolyte cell for the sustained lift. I can whip up a quick test rig with a sodaācan piston and a miniature Liāion cellācould be a fun sideāexperiment while we model the thrust curve. What do you think, ready to add a splash of chaos to the mix?
Iāll run the numbers. A single COā burst can give a 200ām/s spike if the chamber is 1āÆL, but it drops to zero in 50āÆms. Adding a Liāion cell will supply 1āÆkW of power for a few seconds, which is enough for steady hover if the propeller is sized correctly. The hybrid system will need a rapidāactuation valve and a failāsafe that cuts power if the COā pressure rises too fast. Iāll calculate the optimal timing between the burst and the cell, and give you the maximum thrust per unit of mass. If youāre ready to assemble the rig, letās schedule the test at 1400āÆhrs so I can monitor the data live.
Sounds epic, Skarliath! Iām ready to crank the valve and set the timerājust bring the Liāion pack and the 1āL chamber, and Iāll spin up the propeller while we watch the data pop. 1400, got itāletās make that COā pop and the battery buzz, and see if the hybrid dance can keep the drone hovering for real!
Got it, I'll bring the Liāion pack and the 1āL chamber. At 1400 I'll start the valve, run the burst, then switch to the cell and log the thrust curve. We'll see if the hybrid keeps the drone aloft.
Awesome! Iāll set up the propeller and the data logger right now. Bring the pack and chamber, and at 1400 Iāll fire the valve, watch the COā pop, then switch to the batteryāletās see that hybrid lift in action!
Pack and chamber ready. I'll have the Liāion pack on standby and the valve timing set to 1400. Once you fire, I'll monitor the pressure and thrust data and log any deviations. Let's keep the sequence tightāburst first, then immediate switch to battery. We'll hit the target.