Richard B Rothrock wrote:

Hi Paul,

I understand the 13b cycles.  It is that cavern I don't get.
Maybe the enclosed picture will help what I am looking at.

                                                  

I think it is a reflection from the highly polished end housing.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org