In this book there are several drawings of projects/studies around Boeing 707 design.
- Similar to B-47: 2 jet double pods and shoulder mounted swept wings.
- Boeing model 473. Idem first one in pg 20, but only 2 engines
- Boeing model 473-25. Idem first one in pg 20, but 6 engines: 4 jet pods 2 single inboard and 2 double outboard
- Boeing model 473-47. Idem first one in pg 20, but low wings and only 2 engines. Smilar to Boeing 737 but straight tail surfaces and moderately swept wings.
- Boeing model 707-6. Low wings 2 jet double pods. Very close to 367-80 (dash 80)
- Boeing 707-7-27 like dash 80 but with 4 turboprops and wing tip tanks
- Boeing 707-7-39 like dash 80 but with 6 engines: 4 jet pods 2 single outboard and 2 double inboard, and wing tip tanks
- Boeing 707-020 Shortened version with only 2 engines
- Boeing 707-320-101 Double deck large-capasity (up to 250 passengers) version
Here is a 1950s Boeing promotional film detailing the Boeing 367-80 (N70700), better known as the "Dash 80," recently posted by Periscope Film on YouTube. It's cliche, but appropriate in this instance, the film ends with the caption "This is not the end, but the beginning."
YouTube - Periscope Film: "BOEING MODEL 707 STRATOLINER / STRATOTANKER PROTOTYPE PROMOTIONAL FILM 31394"