harry wrote:
On Sep 22, 9:59 am, "Dave Plowman (News)"
wrote:
In article ,
Doctor Drivel wrote:

The same reason we will have highly inefficient piston engines.

I believe it was originally thought that Wankel engines would be
cheaper to make and more problem free.
Proved not to be the case.

Senile person, they are much smaller, much lighter, much simpler, high
power/weight ratio, only a few parts, ultra smooth, ultra quiet. They are
ultra reliable.

Now you know. Can you remember this for next time?