> The propellant mix that would produce the greatest specific impulse for a rocket motor is sometimes given as oxygen difluoride and pentaborane. Spicy! How do

> The propellant mix that would produce the greatest specific impulse for a rocket motor is sometimes given as oxygen difluoride and pentaborane. Spicy! How does that compare to metallic hydrogen and metastable helium? https://www.projectrho.com/public_html/rocket/enginelist.php#id--Chemical--Metastable--Metallic_Hydrogen https://www.projectrho.com/public_html/rocket/enginelist.php... https://www.projectrho.com/public_html/rocket/enginelist.php#id--Chemical--Metastable--Metastable_He^* https://www.projectrho.com/public_html/rocket/enginelist.php...