I hadn't seen this much detail before on RAN 1960's attack carrier planning.
The document is available on line at;
The proposals seem quite thorough, include manning and costs broken down year by year.
Life for the 27C modernised is supposed to something like 18 years - the RAN was a little sceptical of this.
Operating costs - appear to be about 8 million pounds per annum more expensive than Melbourne - including flying the airplanes. Doesn't give the baseline Melbourne operating costs but you would assume something like.
Melbourne + Airgroup - L 6M pa.
Oriskany + Airgroup - L15M pa.
Note 1 - this 32 fix wing + choppers airgroup is actually fairly light compared to capacity - particularly for CVA-01 - put gels well with my general naval rule of thumb - cumulative operating costs exceed initial capital after 4 years.
This is a bit of a shot over the bows of you CVF is more expensive to cancel types - the cheapest part about being a carrier operator is buying the damn things.
Note 2 The RN/RAN seem to have been corresponding to good effect here on the CVA-01 pre cancellation, including putting the "Kendrew Report" in with this proposal - from Britain on "The Defence of a Carrier Task Force".
Note 3 - Hey you limies - this damn old Essex warmed over is actually a better ship than your brand new CVA-01! More speed, greater endurance, same fuel, better protection, Better electronics and RAN (DDG) compatible combat data systems. Whats that you say, those damn yanks are used car salesmen, the ship will be worn out in ten years and the first f-4 that lands will put a hole in the tinny aluminium deck? Surely not?
1965 RAN plans
Build a CVA-01 in the UK L72m Au (1972-74 delivery)
Build a CVA-01 in Aus L100m Au (considered impract)
Build a 52kton USN carrier inUS L103.5m Au
Refit an Essex 27C in US L58.1m Au (by June 1968)
4 E-1 Tracer
Airgroup including reserves and training
28 F-4B L19M Au
24 S-2E L10.6M Au
*8 E-1 Tracer L6.8M Au
Equipment, arm and spares L 23M Au
Facilities L2.2M Au
Carrier spares, arm and fac. L14M Au
Contingency and rounding L13.6M Au
Total Project cost for Essex 27C option - L150m Au.
Same airgroup from CVA-01 L164m Au
Same airgroup from US 52Ktin carrier L200m Au
Perhaps little wonder then they went this way.
1/6th the capital - less than half the operating - some useful capability in a regional sense but not an attack carrier.
Melbourne Refit $2m Au
2nd Melbourne Refit (Cat mods+deck) $?
10 A-4, base, spares stores L10m Au
A-4's Trackers mods etc total $Au 45m.
Note 4 - Australia decimalised currency in the late sixties (2 :1 swap).
Note 5 - I don't recal the USN ever operating a 27C like this - it would be an interesting mod.
Now - if I could only find a costed Centaur study….