|Quoting AlexPorter (Reply 28):|
Quoting L-188 (Reply 24):
I would point out that while that is probably the most complete Boeing jet line you will find, the Boeing 720 is noticably absent.
Well, the 720 is basically a 707 variant. It just wasn't given a new designation like the 707-500 or anything like that, as would have happened under modern practices. So the 707 serves as that purpose.
It would have been nice if they could have included a 720 but I'm not sure if any are still flying except the one used as an engine testbed by Pratt & Whitney Canada.
While the 720 was a close relative of the 707 it had a lot of design differences apart from the shorter fuselage, including changes to the wing profile and a lighter structure. That made the 720B with JT3Ds a very impressive performer, with the same engines as the heavy 707-320B/C models but approximately 100,000 lbs. less gross weight. While the non-fan 720 like those operated by UA
seemed underpowered (unlike several other 720 operators like AA
never re-engined their 720s to became 720Bs), the 720B was a real hot-rod of that era, the closest equivalent to the 757 among the early 4-engine jets. They always seemed like they could take off on 3, or even 2, engines, and the climb rate could be very impressive. The 720B was always one of my favorite early Boeing types for that reason.
Although originally intended mainly for medium range routes, the 720B in particular turned out to be a very versatile aircraft. LH
operated their 720Bs throughout their network in the early 1960s, as far as Japan and South America, with several stops of course. I was lucky to fly on the standard non-fan 720 operated by UA
and 720Bs of AA