SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE 



VOL. 27, NO. 3. PL 1 



Q/ 1 \K 



N° 11 



N2 IS 



■ (J - 



N5W 



N?I5 



N?26 



H* 3 



A 



N? 30 



NS31 



20 



■LI II 1 1 1 1 



40 



-J 



60 60 100 CM 



RUBBER-MOTOR MODEL AERODROMES NOS. 11, 13, 14, 15, 26, 30, 31 



