4 ms·
1 micronewton / watt is a surprising amount of thrust. The implied velocity of whatever it's pushing against is 1e6 m/s, which is 1/300 the speed of light.
by tlb 12y ago
1 micronewton / watt is a surprising amount of thrust. The implied velocity of whatever it's pushing against is 1e6 m/s, which is 1/300 the speed of light.
- hliyan 12y agoHow does one calculate this?
- TheLoneWolfling 12y ago(1 micronewton / watt)^-1 Units cancel out to give m/s. This is just specific impulse. Though Isp is generally measured in seconds (implied gravitational field of the Earth gives s * m/s/s = m/s.)
- heliumcraft 12y agoisn't that super low? if 1 micronewton = 1 newton * 10^-6 then to push against 1kg it would require 1.000 MWatts?
- tlb 12y agoSuper-low compared to pushing against matter. But 300x higher than pushing against photons.
- TheLoneWolfling 12y agoNot to mention you don't have a high-powered beam of photons cooking everything behind you.
- MertsA 12y agoWhat's more surprising is that every number I've seen for the higher power Chinese test was 750 milinewtons for 2.5kw of power. That's 300 micronewtons per watt of power.
- wnkrshm 12y agoAre you sure? 300 µN per W would equal a photon drive's efficiency, with 300MW = 1N.
- MertsA 12y agoActually a photonic drive takes only 299.792458 MW to get a newton of thrust. You're units are off, the thrust per watt is equal to 1 / c which would come out to 3.3356 nanonewtons of force per watt. As for the accuracy of the 750 millinewton figure, that's the only one I've seen for the Chinese results but again, that has to be an error, even if the EmDrive did pan out in the end that's just an unbelievably high amount of thrust. I would assume it's supposed to be micronewtons and that was lost in translation.