I think you guys need to check the statistics on the Navantia LHD. For starters it CAN carry up to 30 aircraft in it's hangar, plus 6 on the flight deck depending on configuration of the vessel WITHOUT affecting either it's troop carrying capacity OR fuel/munitions capability.
It operates a dedicated below decks hangar, a light vehicle garage AND a tank deck. Without the light vehicle garage OR tank deck used to provide additional air capacity the vessel CAN operate 12x CH-47D sized helo's OR JSF/AV-8B sized aircraft in it's normal hangar PLUS 6 more aircraft (JSF/AV-8B or up to CH-47D sized helo's) from the flight deck.
A more useful configuration includes: 10x JSF/AV-8B aircraft and up to 12x CH-47D sized helo's IN the hangar and the normal 6x aircraft on the flight deck. There is NO reason why a mix of helo's and fixed wing aircraft can't be carried by this vessel. Even this configuration STILL leaves the tank deck unused as well as the troop carrying capacity unaffected.
In addition to which, significant quantities of fuel, spare parts etc are obviously carried by the vessel. What are the helo's going to use when they operate from it?
Go to the manufacturers website and look at the capabilities and configurations yourselves, it's right here:
Google Translated
The LHD's deployed to any theatre with ANY sort of threat ARE going to be escorted by surface combatants AND an underway replenishment vessel/fleet oiler. Talk of additional ones necessary is ridiculous in my view.
Look at major RAN deployments in the past. Kanimbla and Manoora are deployed like this. There's NO WAY an LHD with the importance it will have will go ANYWHERE even slightly dangerous un-escorted.
I've said it before, and I'll continue to. A "light carrier" capability is emminently possibe with the Navantia design and this is EXACTLY how Spain intends to use the vessel herself.
There is not one reason WHY Australia could not operate such a capability.
I concede it will not match the capability of a USN Super Carrier, the French CDG, or even the planned British/French CVF's.
I concede that operating a significant airwing aboard the LHD will affect it's amphibious capacity.
I do not concede that it is not worthwhile doing so. Some ABILITY to provide sea based air power for deployed Australian forces, is surely better than none, and I emphasis AGAIN, the flexibility to do so IF NECESSARY is a very worthwhile proposition. The vessel is designed to operate a small complement of fighter aircraft on a permanent basis anyway, certainly enough for the ADF to maintain a sea based capability, that could be expanded if necessary.
I do NOT advocate limiting our Amphibious capability, UNLESS there is an identified need for greater "at sea" airpower.
The only real issues are funding, to acquire the more expensive STOVL version of JSF and the actual selection of the Navantia design itself. If the French design is chosen, it will obviously rule this entire discussion, moot.