With improved rotor systems, better airfoils, simplification of structure, rotors of 80 ft can now be built which will operate efficiently; this size is necessary to produce rotary wing airplane to operate at 40¢ per ton mile, which is minimum economical requirement for successful aerial bus service.
Approach to practical helicopter
Aero Digest
Aero Digest ; 47 , n 2
1944
Article (Journal)
English
© Metadata Copyright Elsevier B. V. All rights reserved.
Practical helicopter performance charts
Engineering Index Backfile | 1949
|Practical instrument flying in helicopter
Engineering Index Backfile | 1950
|Practical instrument flying in helicopter
Engineering Index Backfile | 1950
|A practical helicopter cabin noise simulator
Tema Archive | 1986
|