Bill, The tank looks to be home made... it looks a bit small for a 2.5cc to me. (ie maybe 1 oz)
Steve, The event was held at a High School so the grass is most likely Kikuyu, which is very common here as it is a hard wearing ground hugging grass suitable for playing fields, schools, parks etc. Also is is cheaper than most other turf. It requires regular mowing in the warmer months. It tends to brown in the winter and has high resistance to cold and frost. It's a good all round grass for playing fields, yards and parks.
The other popular grasses here are Buffalo and Couch. Buffalo is a broadleaf grass, very strong, and expensive but does tend to go black in the winter. Couch is much finer and used for bowling greens, golf greens and lawns. Couch doesn't like cold or shade.
To find out more try Googling "Kikuyu grass". :-)
Cheers