4 ms·
> For ND-500+, they claim up to 250kNs of total impulse and a wet mass of 10-20kg Wouldn't bet on it. The same PDF on their website[0] claims an Isp of 2500 s
by schiffern 3y ago
> For ND-500+, they claim up to 250kNs of total impulse and a wet mass of 10-20kg
Wouldn't bet on it.
The same PDF on their website[0] claims an Isp of 2500 seconds. If you do the math (I=mv), the propellant mass works out to 10.2 kg. So at the low end of their "10-20 kg" estimate, 102% of the total thruster mass would need to be the eroded solid propellant, leaving a -2% mass budget left over to cover the power supply, capacitors, control electronics, and all non-eroded structures.
That seems... optimistic.
The technology seems cool, but putting trivially impossible numbers on your launch website is a big red flag.
[0] https://web.archive.org/web/20231221000314/https://neumannspace.com/wp-content/uploads/2023/09/Neumann-Drive-Datasheet_Sept-2023.pdf https://web.archive.org/web/20231221000314/https://neumannsp...