SIGS-16

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Can someone explain why SIG-16 was put forward to the SIGS requirement when it supposedly lacked the desired range and supposedly SIGS always has a range requirement of over 20,000yards?
Also why is it designed with light alloys that limit it to mach 3 as a maximum speed for the duration of it's flight?
 
Correction to above
SIGS requirement seems 20,000yards for low level targets and 30,000yards for high level targets.

SIG-16 meets this requirement.

But not chosen...?
Why when it's smaller than the CF299 ?

Another question, why does SIG-16 require a seperate booster?
After all surely this could be achieved in a unitary vehicle. Even if that meant using technology from Blue Water?
 
So with apologies to JCF Fuller but his post elsewhere is highly relevant to this.
This programme did continue and it ended up being Sea Dart, on the way unitary missiles with Tandem boost were looked at - there are diagrams of such missiles, in hypothetical form, at Kew along with comparisons to Tartar. The original SIGS/CF.299 staff requirement from late 1960 was a re-write of the 1956 G.D.45. There was continuity of thought going all the way back to 1948, the desire to replace the 3 inch Mk.6 or 4.5 inch Mk.6 and MRS.3 combination with a guided weapon, even though the concept evolved. A 1959 report declared the requirement possible but pointed out that no in-service radars met the requirement. ASRE/ASWE had been busy with the large FSR for NIGS so had not been looking at Small Ship solutions, when a staff target for such a radar was approved, D.N.110(T), ASWE made some tentative proposals but they don't appear to have got very far before Type 988 came along.

Type 988/Broomstick was attractive because it would be available soon, in theory, and allowed a cost sharing package deal with the Netherlands. Any European country would have done and discussions about naval radar were held with the French too. However, it seems that significant factions of the RN didn't like the Type 988 from the outset, it lacked the tracking functions the RN wanted, was not as advanced as the work ASWE were doing, they felt its data handling and power requirements were too great and its size and weight meant it could not fulfil the requirement for SIGS to go on a 3,000 ton ship. They didn't like the use of S-band either. The British side went so far as to set up a joint 2 man study group with the Dutch to see if the Type 988 could be designed in such a way as to allow the British to replace the Dutch aerial with an ASWE designed version as an M-modification at a later date - given the planned timeline it could not. I described the impact this had on the Sea Dart system here.
 

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