For  the internal combustion engine designer and enthusiast to  comprehend  the principles of the NELSON FLYWHEEL POWER PLANT they must first  admit that their beloved engine was born, in 1870, with a critical  birth defect,  it had great difficulty in breathing and, after 135  years, the only solution has  been to try to give the poor thing  super charges of air, when what it really  needed, like your asthmatic  grandad, was some oxygen.
The failure to  recognize this started  engineers down the wrong path, which they have followed  ever since.
To  get enough oxygen for combustion they resorted to compressing  air  and to make an automatic cycle they designed a crankshaft that would  compress air and fuel mix and convert the expanding products of  combustion to  rotary power. The fallacy of this is the throw on  a simple crankshaft limits the  expansion, resulting in very high  exhaust temperatures, which determines the  efficiency of the cycle.
The  Carnot cycle, the basis for all heat engines and  the Joule -  Thomson laws of thermodynamics show that for a system to reach  the  point of converting 100% of the heat, it would  have to expand a  ratio of 1:273.  All ICE's, including the Wankel, suffer from this heat loss and  incomplete combustion.
  Rockets, explosive propellants and  the NELSON / TYWA  FLYWHEEL POWER PLANT require no compression  AND THEREFORE, NO EXPANSION LIMITING  CRANKSHAFT. Instead, the  pressure is expanded through a fixed turbine,  converting most  of the heat in to work, rotating the mass of the engine, which  stores  unused torque in each power cycle, as a flywheel. The unrestricted  expansion substantially lowers exhaust temperatures and dramatically  increases  fuel efficiency.
 

The power take-off is a hydraulic variable  flow/pressure  type pump / motor comparable to an electric motor /generator . The  engine mass is rotated by the combustion / power cycle of the  engine and only  fires when the rotation drops below a set rpm  and stops firing when a safe rpm  is reached (600-2,000). At 2,000  rpm the engine / flywheel has stored 200,000  ft#'s of energy (similar  to a huge battery pack or steam boiler but without the  inherent  added weight they require) so theoretically you could take 200 ft  #'s  to drive your vehicle for 1,000 sec.s   Of course friction and other mechanical  losses would reduce this time by 30-40%.  These mechanical losses  would slow and finally stop the rotation when no power  is added  or a simple braking system would stop the  rotation.
 

Many factors  enter into this tremendous loss of energy. mechanical  accounts  for much, but the major loss is in the incomplete combustion, which occurs at even low rpm's but increases substaintialy as rpm's increase. Pure  oxygen  gives complete combustion but reciprocal engines can  not handle even a  modest oxygen enriched fuel mix. Contrary to  a conventional ICE, that must  rapidly dissipate heat, the NELSON   FLYWHEEL POWER PLANT thermally traps most of  the heat energy,  converting and storing it through the flywheel  effect.
Practical  applications of the NELSON / TYWA FLYWHEEL POWER PLANT,  beside  auto/truck are heavy equipment that spend > 30% of their operation  backing up or no load and electric generators that must be oversized  to  accommodate start-up loads and surges, ships and pleasure craft  need fuel  economy but they can benefit also by utilizing the  inherent gyroscopic forces as  a stabilizer.