Activity for dmckeeâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #276696 |
Also of note, the preference for higher exhaust velocity is predicated on having sufficient power available. You get more $\Delta v$ per gram of propellant from higher exhaust velocities, but it takes more energy per unit $\Delta v$ (and of course a photon drive represents the ultimate in this trade-... (more) |
— | almost 4 years ago |
| Comment | Post #276696 |
On the other hand, this answer is also neglecting space-charge effects which will cause the beam divergence to grow after leaving the confines of the engine. If I find time I'll do a BoTE estimate. (more) |
— | almost 4 years ago |
| Comment | Post #276232 |
BTW -- I've discussed various issues brought up in this answer in rather more detail in various posts on physics stack exchange. But I don't feel like sprinkling my first post here with links pointing back there. (more) |
— | almost 4 years ago |