But agreed it is possible they had a Harrier that flew for training etc...
Possible- it's likely that Australian pilots on exchange programs flew British (and
possibly USMC) Harriers.
But with the 1982 cancellation of plans to sell the British ship HMS Invincible (a "Harrier carrier") to Australia, I think it's unlikely that such flying would be done in Australia in 1983, more likely the UK or West Germany (or if with USMC, the USA and USN ships).
- Traveled around 70 to 80 mph.
These speeds are well below the stall speed of a Harrier in forward flight (where airflow over the wings provides lift).
Of course, a Harrier could vector its thrust, enabling it to fly very slowly or hover-
-if the engine has problems while doing this, the plane's going to drop pretty much vertically- there's no option of a steerable glide to a preferred "ditching" area.
Engine failures, and bird strikes, are thankfully rare, but I don't think Australian civil
or military authorities would approve sustained vectored thrust-dependant flight over a residential area. Why take the risk- and for what purpose?
Plus vectored lift is an extremely inefficient use of fuel, I won't pretend to know the figures (I think there are one or two members here who might have an idea, or be able to calculate it) but it would massively reduce the time spent in the air-
- Sighting went for 5-6 hours.
I don't think this is achievable by a Harrier (without in-flight refuelling) in forward flight, let alone while vectoring.
Harriers don't have a particularly long range for a combat aircraft, and therefore limited endurance (time in the air).
From Wikipedia, data for Harrier GR.3 (1983 was before AV8B/ Harrier II),
https://en.wikipedia.org/wiki/Hawker_Siddeley_Harrier
External Quote:
Maximum speed: 635 kn (731 mph, 1,176 km/h) at sea level
Ferry range: 1,850 nmi (2,130 mi, 3,430 km) with 330 imp gal (400 US gal; 1,500 L) drop-tanks, 3,000 nmi (3,500 mi; 5,600 km) with one AAR
Endurance: 1 hour 30 minutes combat air patrol 100 nmi (120 mi; 190 km) from base, 7 hours plus with one AAR
(...where AAR= air-to-air refuelling, which I think is unlikely in this scenario).
And the Pegasus engine of a Harrier is
loud. Constable Ferguson's account, courtesy of member ManInBlack:
External Quote:
Object 2 by Constable Ferguson (Fig. 4 (5.45 am)
"The object came closer and eventually passed directly overhead; we shined the spotlight onto its underside..."
Also in the policemen's statements,
Object 1 "Admitted a whirling sound (not like a conventional helicopter)."
Object 2 "Admitted a low pitched humming sound."
I think it's extremely unlikely that these reports can be reconciled with the whining scream of a Rolls-Royce Pegasus engine.
The sketches of object 1 both strongly suggest a small helicopter of dated design, as others have posted, probably a Bell 47 or maybe an Alouette II.
The reported sounds (particularly "...a whirling sound") imply a light rotorcraft, not a jet fighter-bomber.
Z.W. Wolf's and deirdre's pictures of the underside of pontoon-equipped Bell 47s make a helicopter of that type a plausible candidate for object 2 IMHO.
The details of object 2's sides as sketched by Ferguson have some resemblance to these pontoons on an Alouette
We know Bell 47s had been used by the Australian army and rescue organisations, and are still used for spraying.
I don't know if the TV series M*A*S*H was shown in Australia-
-but on reflection I find it implausible that the cops who sketched "object 1" didn't notice the resemblance to a helicopter tail-boom (though it
was described as looking like a gyrocopter):
Object 1 looks very much like a Bell 47 tail-boom, without the fuselage (or whatever it's called) of a Bell 47.
Object 2 looks (arguably) like the underside of a Bell 47 with pontoons, without a tail-boom.
I wonder if there was an element of a practical joke by the police witnesses, whatever they actually saw- to see if the despatch officer back at the station (or maybe their boss) would "put 2 and 2 together".