DIfferent versions - aviation section
Discussion
The Boeing 707 line -
Boeing 367-80

Boeing C-135 variants





There are lots more C-135 versions.
Boeing 707-120

Boeing 707-138

Boeing 707-220

Boeing 707-320

Boeing 707-420

Boeing 720

Boeing 720B

Boeing 707-320B

The differences between the multiple versions may not be that blindingly obvious but lots of changes were made as the 707 and C-135 family developed -
taller tail fin
dorsal fin added
larger dorsal fin added
dorsal fin removed
pure turbojets (Pratt and Whitney JT3C and JT4)
early bypass turbofans (Rolls Royce Conways and Pratt and Whitney JT3D)
later large fan turbofans (CFM56)
smaller wheels (720)
beefed up wind (720)
wing plan changed (the 707-320B/C versions)
variable fuselage lengths
Some 720s also did not have the characteristic tail mounted HF aerial fitted.
Boeing 367-80

Boeing C-135 variants


There are lots more C-135 versions.
Boeing 707-120

Boeing 707-138

Boeing 707-220
Boeing 707-320

Boeing 707-420

Boeing 720

Boeing 720B

Boeing 707-320B
The differences between the multiple versions may not be that blindingly obvious but lots of changes were made as the 707 and C-135 family developed -
taller tail fin
dorsal fin added
larger dorsal fin added
dorsal fin removed
pure turbojets (Pratt and Whitney JT3C and JT4)
early bypass turbofans (Rolls Royce Conways and Pratt and Whitney JT3D)
later large fan turbofans (CFM56)
smaller wheels (720)
beefed up wind (720)
wing plan changed (the 707-320B/C versions)
variable fuselage lengths
Some 720s also did not have the characteristic tail mounted HF aerial fitted.
Sorry if this sounds as if I am being pedantic, but the KC-135 is not a 707. Had the 135 been developed as a pax aircraft, the seating would have been 2-3. The 707 family fuselage is larger than the 135 fuselage. There are a host of other differences, but the major one is the diameter of the fuselage.
The 707 was very much a learning curve for Boeing. There were lots of problems with the early variants - including a tendency to Dutch Role. This was partially cured by making the tail fin taller and by adding a dorsal fin. The UK authorities insisted that the dorsal fin be enlarged on the 420s version which was the version ordered by BOAC. The problem was eventually fixed by fitting an automatic yaw damper system which is why the dorsal fin disappeared completely on the later versions.
phil squares said:
Sorry if this sounds as if I am being pedantic, but the KC-135 is not a 707. Had the 135 been developed as a pax aircraft, the seating would have been 2-3. The 707 family fuselage is larger than the 135 fuselage. There are a host of other differences, but the major one is the diameter of the fuselage.
I think the point is that both the KC-135 and the 707 are versions of the 367-80.Gassing Station | Boats, Planes & Trains | Top of Page | What's New | My Stuff