It appears that Chevaline enterd service n 1982 so was still under development in 1980:
Well before Polaris entered service in 1968, it was thought likely to be vulnerable to the anti-ballistic missile system in development by the Soviet Union. It was therefore decided to produce a countermeasure. The starting point was the American Antelope system, itself based on Polaris A3.
Over a decade and half, the British developed it into a capability for degrading the Soviet anti-ballistic missile system radar. This would have given attacking warheads the chance to penetrate this type of defence. The counter-measure became better known as ‘Chevaline’ and it entered service in 1982. By then, Trident had been selected as the next delivery system for the British deterrent.
Source:
http://www.awe.co.uk/aboutus/Our_History_f77a4.aspxChevaline test launches were conducted in the US and Australia, e.g..
1979 - Launch Site: Woomera. Launch Complex: LA2. Launch Pad: LA2 HRV. Launch Vehicle: Falstaff. LV Configuration: Falstaff F.5.
Falstaff Chevaline warhead test launch Agency: RAE. Apogee: 131 km (81 mi).
1979 - 23:47 GMT - Launch Site: Cape Canaveral. Launch Complex: LC29. Launch Pad: LC29A. Launch Vehicle: Polaris A3. LV Configuration: Polaris A3 A3TK P-3.
Polaris A3 Chevaline warhead test launch Nation: USA. Agency: RN. Apogee: 1,000 km (600 mi).
Source:
http://www.astronautix.com/thisday/april04.htmTherefore, the object was not placed in the forest as the result of a test firing.
As you rightly said, the object was dropped vertically, with only minimum forward momentum. This suggests the object was dropped from a rotary wing aircraft traversing the forest at slow speed and an altitude of approx 150ft (the altitude has yet to be confirmed but any higher and the oject would probably have been completely destroyed on contact with the ground).
Problem: Polaris and similar were usually transported by road. If Chevaline was being stress tested on the 'ness but was en route to the twin bases for outward shipment to the US or elsewhere by aircraft, it would have made sense to transport it by road. It could have remained in the truck whilst the truck itself was loaded into a transport aircraft. This would have ensured absolute - or as near as dammit - secrecy. The landing site(s) is about one third of the way to the southern end of the 'ness and on a direct bearing to the pagodas.
Questions:
a. Why was the object being carried by helo?
b.Was it simply slung below the aircraft or was it boxed and in a cargo net?
c.Were similar nightime flights a regular occurrence?
d. Is the 'upside down' mushroom seen by the witness at Sudborne (on a track towards the north end of the 'ness) evidence of regular flights between the twin bases and the 'ness
e. Who ran the research on the 'ness in 1980? The US or the UK or both?
f. Was the 'upside down mushroom' simply something in a cargo net suspended below a helo
g. Did such research involve Chevaline, bearing in mind construction of the device took place elsewhere
h. If such flights were a regular occurrence were they flown by specialist aircrews who did not require clearance from the towers at either Bentwaters or Woodbridge. Instead, when normal flying had ceased, these flights were arranged locally on an 'as required basis', directly between a flyco in the crew office and his oppo on the 'ness. i.e. someone on the 'ness simply calls the crew office with a 'send a taxi' type request.
....and one last thought and this might sound daft - was it possible that the object was enclosed in heavyweight shrink wrap black plastic or similar, for protection during transportation?
You can fool all of the people some of the time and some of the people all of the time but you cannot fool all of the people all of the time (Winston Churchill)...causa latet, vis est notissima