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I had a quick re-read of the relevant sections of Tony's book and the large PT428 had its range extended by adding a large booster. Even this could not reach the minimum range required - which is why something larger levering Blue Envoy was submitted. It's interesting to note that this would have used command guidance - requiring an illuminator, missile tracker, and datalink for each missile - maybe why the NIGS Frigate has both illuminator and guidance radars.


Any info on XPX430?


Also - any info on the Armstrong Whitworth NIGS submission from team 502?




That call could be made on 985 - but for NIGS the problem was that it had a large minimum range - thus limiting its effectiveness against SSMs.




Where'd you get the info on the cruiser alternative Zen?


As for variants - IIRC Tony's book implies a stong link between Blue Envoy and NIGS. Given the predominance of Bristol GW in UK Ramjet work it'd be a safe call to suggest this cruiser missile has some family link to Blue Envoy.


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