Most designs can be made with common materials ... Are there any downsides to using a rocket stove? While rocket stoves are generally very efficient and eco-friendly, they do have a few downsides.

The system would achieve an ISP of about 67300. This would be about 20 times more efficient than most chemical rockets. Exhaust velocity would be 66 km/second. The 300 ton design has a thrust of 2.9 ...