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| | Vickers Valiant |
 | | Initial Valiant production aircraft featured four Rolls-Royce Avon 201 turbojet engines, with 4,301 kilograms (9,500 pounds) thrust each. |
 | | The Type 674 was powered by Avon RA.14 engines with the same 4,310 kilograms (9,500 pounds) thrust each as the earlier Avon 201, while the Type 706 was powered by Avon RA.28 204 or 205 engines with 4,760 kilograms (10,500 pounds) thrust each, longer tailpipes, and water-methanol injection for takeoff boost power. |
 | | However, the booster rockets were deemed unnecessary, due to the availability of more powerful Avon variants, as well as fear of accidents if one booster rocket failed on takeoff, resulting in asymmetric thrust. |
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