Comment: Re:27 Engines?! (Score 1) 146
Ideally one big motor is the way to go. But their are reasons for using more than one. The Falcon 9 has an engine out capability so having on of the motors fail is not game over. Also they did it for production reasons. They use the same motor with some minnor modifications for both the first and second stage which saves money. You have one production line for both motors and one stock of most of the parts for the motors.
The Falcon 9 is interesting because it is not the most "efficient' design but the most cost effective. They could replace the steel tanks with LiAl allow and save a good amount of weight, replace the second stage with a LH/LOX burning second stage, or even replace the first stage with a liquid CH4 first stage with a large single motor.
The Flacon is built more like a DC-3 than say the Hughes H-1.