DBR Metrics

Power density of a DBRE engine is predicted to be high. In a four cylinder 4 liter I.C.E. engine only one piston contributes power per crank rotation. Deriving from this that a one liter power stroke produces about 100 hp, horsepower estimates are charted below.
   
However it is misleading to make a direct comparison. The DBRE completes its power stroke six times per rotation. In other words, the physical chamber volume is displaced every 60 degrees or you could say there is a POWER impulse driving the shaft much more effectively. This translates to the conclusion that either the DBRE could operate at one sixth the speed or produce six times the power for a given static measurement of chamber size. Correcting for this we are using a Function Displacement term: The volume displaced during one shaft rotation.

With functional displacement charted below, and a volumetric efficiency of only 50%, an engine about the size of a dinner plate could produce over 200 hp!