Derek Cohen (in Perth, Australia)
I believe they are one and the same.
There was a comment in Wikipedia that the benefit lay with the size: power ratio. I also read that Mazda are planning to re-introduce the Wankel engine.
The Tatra 87 (T87) was a car built by Czechoslovak manufacturer Tatra. It was powered by a rear-mounted 2.9-litre air-cooled 90-degree overhead cam V8 engine that produced 85 horsepower and could drive the car at nearly 100 mph (160 km/h). It is ranked among the fastest production cars of its time. Competing cars in this class, however, used engines with almost twice the volume, and with fuel consumption of 20 liters per 100 km (11.8 mpg). Thanks to its aerodynamic shape, the Tatra 87 had a consumption of just 12.5 litres per 100 km (18.8 mpg). After the war between 1950 and 1953, T87s were fitted with more modern 2.5-litre V8 T603 engines.
Regards from Munich