|
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
Improved Specific Impulse Rocket Engines
In article ,
Bob Martin wrote: The highest chemical engine Isp I've seen is about 520-530... it was done using a three-propellant engine (of which one propellant was fluorine). Clark says 541s was demonstrated (with a high-expansion nozzle) using fluorine-lithium-hydrogen, with the Li and F stoichiometric and about 25% hydrogen (which is just reaction mass, it doesn't get involved in the chemistry) by weight. Jeff Greason once did some numbers on launchers using that combination, and concluded that even if you ignore all the practical problems, the *vehicle* performance is always inferior to straight LOX/LH2. The vehicle performance penalties of using LH2, e.g. the mass of the huge hydrogen tanks, completely overwhelm the Isp advantage. -- MOST launched 30 June; first light, 29 July; 5arcsec | Henry Spencer pointing, 10 Sept; first science, early Oct; all well. | |
#12
|
|||
|
|||
Improved Specific Impulse Rocket Engines
|
#13
|
|||
|
|||
Improved Specific Impulse Rocket Engines
|
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Private Rocket SpaceShipOne Makes Third Rocket-Powered Flight | Rusty B | Space Shuttle | 10 | May 16th 04 02:39 AM |
Specific Impulse & Exhaust Velocity | Makhno | Science | 1 | March 29th 04 02:31 PM |
Rockets not carrying fuel. | Robert Clark | Technology | 3 | August 7th 03 01:22 PM |
Specific heats at high pressure | Iain McClatchie | Technology | 4 | July 14th 03 07:55 PM |
F2/H2 vs H2/O2 specific impulse: why fluorine is higher ? | Henry Spencer | Technology | 0 | July 14th 03 04:10 PM |