4 ms·The Rocketdyne tripropellant, the best performing rocket engine of all time5 points by bane 3y agopfdietz 3y agoI believe ozone + hydrogen + beryllium has slightly higher theoretical Isp, but no one has ever been crazy enough to try it.db48x 3y agoDefinitely recommend everyone go find the PDF for Ignition!, or the second edition which was printed recently. Wonderful book.