If you were selecting a small engine to be used as a power source for (i) a chain saw,
(ii) a skate board, (iii) a model aircraft able to lift 10 kg and fly for 10 km, what engine parameters would you pay most attention to in each case?


References

Moran and Shapiro, Chapter 9

Reynolds and Perkins, 2nd Edition, Chapter 9

Black and Hartley, Chapter 7