| 
 For any interested, here is the best explanation I 
have seen about the confusion when the displacement of the 13B comes up in 
conversation.  It shows how two different viewpoints can end up with two 
different values - however, if you want to compare the rotary with other 4 
stroke engines then there is clearly only one meaningful way of doing 
so. 
  
Ed Anderson 
  Your files are attached and ready to send with this 
message.
 |