Sure, here are the comparative specs for the SpaceX Merlin engine and the Rolls Royce RZ.2 engine:


Engine Model	Thrust (kN)	Specific Impulse (s)	Fuel Type
SpaceX Merlin                	845-934	282-311   	RP-1/LOX
Rolls Royce RZ.2             	17.8	Unknown	        Hydrogen


As you can see, the SpaceX Merlin engine is significantly more powerful with a thrust of 845-934 kN compared to the Rolls Royce RZ.2 engine's thrust of 17.8 kN.

Additionally, the SpaceX Merlin engine has a higher specific impulse, which means it is more efficient in converting fuel into thrust.

Both engines use different fuel types, with the SpaceX Merlin using RP-1/LOX and the Rolls Royce RZ.2 using hydrogen.

Engine	Thrust (sea level)	Specific Impulse (sea level)	Thrust-to-Weight Ratio	Burn Time
Merlin	190,000 lbf      	282 s                               	 180	~180 s
RZ.2       	8,000 lbf          	278 s                                	37.5	~480 s


Here is the table comparing the SpaceX Merlin engine and the Rolls Royce RZ.2 engine based on their technical specifications. 

The Merlin engine has significantly higher thrust at sea level and a higher thrust-to-weight ratio, making it more powerful and efficient. However, the RZ.2 engine has a longer burn time and very similar specific impulse at sea level.

After analyzing both engines, the following table summarizes the key differences and similarities between the SpaceX Merlin engines and the Rolls Royce RZ.2 engine:

Criteria                               	SpaceX Merlin Engine       	Rolls Royce RZ.2 Engine
Manufacturer                 	SpaceX                           	Rolls Royce
Type                                  	Liquid rocket engine       	Turbofan engine
Thrust (Vacuum)	             845 kN                                	 N/A
Thrust (Sea Level)         	720 kN                            	80 kN
Specific impulse (Vacuum)	311 sec                             	N/A
Specific impulse (SL)            	282 sec                            	N/A
Boosters	Used in Falcon 9 and Falcon Heavy rockets	N/A
Fuel type	RP-1 kerosene and liquid oxygen	Kerosene or biofuel
Engine control                 	Electronic                        	N/A
Weight	470 kg	N/A
Cost                                	$5-10 million                       	N/A

In summary, the SpaceX Merlin engine is a liquid rocket engine primarily used in the Falcon 9 and Falcon Heavy rockets, while the Rolls Royce RZ.2 engine is a turbofan engine typically used in aircraft.

The Merlin engine has a higher thrust and specific impulse than the RZ.2 engine, as well as being electronic controlled.

The RZ.2 engine, on the other hand, can use cheaper fuel like kerosene or biofuels and is much lighter.
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