Paul,

   Have you been following the Norton NRV500/700 motorcycle news.
They ran
   173mph at Bonneville in 2010 with this engine.

http://www.asphaltandrubber.com/racing/norton-racing-nrv588-179-mph-
bonneville-salt-flats-bub-week-part-2/

   I can't seem to find any specs on the engine anywhere.

   Mark S.

  http://en.wikipedia.org/wiki/Wankel_engine

  This link may help. At the very bottom there is a little scoop
  about the
  Norton.
  One chamber has 588 cc as the name implies. A larger 700 cc
  chamber size
  is being planned.

  Rolf

  Rolf,

  Did you mean to state that the 588 was a 2-rotor?  According to the
  link, the 588 is a 2-rotor.

  "Norton has used a Wankel engine in several models including the
F1, F1  Sports, RC588, RCW588, NRS588, most notably Steve Hislop
riding to  various victories on Norton's F1 in the TT in 1992.
*Norton now makes a  588cc twin-rotor model called the NRV588* and
is in the process of  making a 700cc version called the NRV700."

  Mark

Marc

The Norton Rotary has 588 cc displacement per chamber. That compares
to 654 cc in the Mazda's, RX3 to RX8, they all have the same displacement
per chamber.

Norton started out with a single rotor and later build two rotor
versions of the same basic design with 588 cc chamber size. The new
NRV588 and NRV700 with 700 cc displacement per chamber are twin
versions, as per the company statements.

In other words the 588 is not far from the 654 Mazda is using.
Perhaps for smaller hp needs a Norton 588 single could be used.
Likely that would be simpler than reducing the Mazda to a single
rotor version. Even the twin might be suitable for aircraft use.
Paul probably has more insight into that.

Rolf

Rolf,

The RX2 and RX3 engines were 1146 or 573 per chamber. The RX4, Cosmo and later
engines; 654 per chamber. Early RX7's had 12A and then 13B engines. The 12A is
closer to the Norton. What is the rotor radius, eccentricity, "a" and rotor
width? Almost all the Mazda engines shared dimensions except the rotor width.

Dale Davies