Ideal vacuum specific impulse is reported throughout this document. The calculated value assumes an infinite nozzle expansion ratio, without losses, discharging into a perfect vacuum.

No particular effort had been made to maximize the specific impulse, that not being the reactor's purpose, but Pewee achieved a vacuum specific impulse of 901 seconds (8.84 km/s), well above the …

The design requirements were a thrust of 250,000 pounds, a specific impulse (I sp) of 840 seconds, and a reactor power level of 5,000 megawatts. The Phoebus-1 series was intended to study increasing …

2 Flow Rate-Phoebus 2A (120 kg/s) Highest Specific Impulse-Pewee (838 seconds) Minimum Specific Mass-Phoebus 2A (2.3 kg/MW) Smallest-Nuclear Furnace (44 MW) Hottest-Pewee (2,550 °K exit …

A chemical rocket peaks around 450 seconds of Isp, but an NTP engine like Phoebus could reach 850–900 seconds.

May 17, 2000 · The delivered Specific Impulse (I sp) of the propellant is simply the Total Impulse divided by the propellant weight or mass. Thus, the units for Specific Impulse are pound-seconds per pound …

Feb 24, 2014 · The last two engines were only tested for several seconds before noticeable failure of the fuel elements. Harold Finger called a stop to any further hot fire testing until the problem was well …

The most powerful nuclear rocket engine ever tested (Phoebus 2a) is shown during a high-power test. The reactor operated for about 32 minutes, 12 minutes at power levels of more than 4.0 million …

The maximum specific impulse for a chemical rocket is about 500 seconds. This is close to what is achieved with efficient expander (RL-10, 462 sec) and staged combustion (SSME, 453 sec) cycles.

Feb 24, 2014 · The last two engines were only tested for several seconds before noticeable failure of the fuel elements. Harold Finger called a stop to any further hot fire testing until the problem was well …