C reiterates his idea of using bottles, T steers back to simulation. C identifies first a problematic and then a good set of rockets for comparison and justifies his choice. T points him back to the simulation. Boys discuss choices of rockets to compare according to C's proposal. C is confused about how to put together gp 2's efforts with gp 1's.
T points out that they already have plenty of data.
S makes argument, then B, then S concludes that we don't know yet about fins. S makes argument. T objects that the data is so close, we probably don't really know yet. Discussion on evidence. T notices that the place is deserted, demonstrates how to close down and shows sites on the web about rockets and even rockets made from bottles.