What if the Royal Navy's Aircraft Carrier HMS Hermes had sisters in the 1920s? (Patreon Live)

The Washington Naval Treaty made cumulative carrier tonnage the main constraint while leaving sub-10,000-ton warships outside a comparable total limit.

Air-group size could make a light carrier look comparable on paper, but protection and subdivision still separated it from a true fleet carrier.

Britain kept smaller warships outside a cumulative limit because cruisers and sloops were essential to protecting maritime trade and imperial communications.

A construction pause delayed the purpose-designed Hermes until 1924, allowing Hosho to enter service first.

Hermes paired cruiser-scale machinery and armament with a practical twelve- to eighteen-aircraft group, long range, and enough stability for distant reconnaissance and presence duties.

A lighter Hermes derivative could trade guns and machinery layout for concentrated protection while retaining a useful 40,000-shaft-horsepower carrier platform.

David Beatty's confidence in shore-based RAF support led him to dismiss repeated small-carrier studies, despite the Royal Navy's need for politically influential leadership.

One interpretation links Beatty's preference for Nelson, Rodney, and lightly protected County-class cruisers, together with few small-ship orders, to his defence of his wartime record.

Battlecruisers traded armour for speed and were best used for running cruiser actions, fast-wing work, and pursuit instead of reinforcing the Grand Fleet in the battle line.

A Tornado F3 analogy leads to a modern naval lesson: Type 31 should be judged as part of a force that uses Type 26 sensors and helicopters against submarines.

The counterfactual places small carriers with cruiser squadrons on the China, East Indies, Australasian, Atlantic, and West Indies stations rather than in home waters.

Six cruiser-sized carriers would keep underused yards, boiler and gun development, and a much larger pool of carrier-experienced personnel active through the interwar years.

British cruiser-carriers give Japan a plausible alternative way to remove reconnaissance from fleet-carrier decks while adding torpedo aircraft to its attritional battle plan.

Ranger's flexing in heavy weather illustrates the structural and seakeeping penalties that can accompany an aggressively light carrier design.

The US Navy could use small carriers as an exposed reconnaissance screen, keeping its main striking decks farther back and creating pressure to protect the scouts against enemy attack.

Australian and New Zealand carriers would carry aircraft support into regions where shore infrastructure could not yet sustain a useful interwar air presence.

The historical rules counted small carriers against the existing ceiling, while this scenario gives the London negotiations a possible 13,500-ton light-carrier category with a separate national allowance.

A 12,800-ton successor to Hermes could carry roughly forty aircraft; the proposed twelve-ship force uses six-group arithmetic despite an audible list of seven destinations.

The two Lexington-class conversions use roughly half the US carrier allowance, giving American negotiators a strong reason to protect fleet-carrier tonnage when a light-carrier category is discussed.

More ships, aircraft, and trained personnel strengthen the Royal Navy's institutional case for recovering control of the Fleet Air Arm several years earlier.

Britain and Japan would make the heaviest use of a light-carrier allowance, while France and Italy might follow, with reconnaissance giving Italy a practical reason.

A network of overseas maintenance bases makes it plausible for six of twelve light carriers to remain available, one for each distant station.

A separate light-carrier allowance removes pressure to economize on fleet-carrier tonnage, producing a larger Ark Royal and more Yorktown-class ships instead of Ranger and Wasp.

A larger carrier programme could develop an aviation-support variant of the light-carrier hull, anticipating the role later embodied by HMS Unicorn.

A proven, affordable light-carrier type gives France, Italy, the Netherlands, Greece, Turkey, and South American navies a stronger reason to acquire naval aviation.

A thirty- to forty-aircraft light carrier can defend a small task group, support convoys, and cover secondary stations while fleet carriers remain concentrated.

US congressional funding, Japanese expansion, and Britain's global commitments and shipyard employment create different political cases for light-carrier construction.

A small carrier could remove aviation fuel from cruisers and maintain or replace their seaplanes, making reconnaissance more reliable on distant stations.

Because aircraft development depended on rapidly increasing horsepower, and diesel engines were not perceived as powerful enough.

Additional carriers create more exercises and operational evidence, which could improve later doctrine and procurement decisions without guaranteeing better judgment.

A light-carrier programme could shift work beyond Japan's crowded core naval yards and bring other substantial facilities into carrier construction.

A wider carrier fleet improves scouting and anti-submarine options, but it deepens the Royal Navy's recurring shortage of destroyers and cruisers for escort duty.

A continuing light-carrier production line could replace Hermes before Operation C and give Force Z enough fighter cover to impose severe losses on Japanese torpedo bombers.

Hermes and Eagle are the strongest candidates: Hermes for range and Eagle for her large hangar.

Use a Hermes-like arrangement on a cruiser hull; the concept is a modest adaptation, not a full fleet carrier.

No. In 1922 carriers were promising but not yet credible substitutes for battleships in the eyes of naval leaders.

It would resemble an M1 or Surcouf with a hangar, but only an I-400-style strike mission gives the aircraft a convincing purpose.

About six could be operational or readily active at a time, with the rest preparing for or undergoing refit.

Probably not in the Royal Navy, which repeatedly considered but did not embrace the type; France was much more likely to expand seaplane tenders.

It would make commerce raiding far riskier by giving cruiser groups wide-area scouting and carrier strikes, possibly forcing Germany to rethink the ships' role.

It could support retention of V and W-class destroyers and begin destroyer development earlier instead of compressing it into the 1930s.

It was a converted ferry used as a First World War seaplane tender, and its aviation fire helped inspire exceptionally cautious British fuel-storage and drainage systems.

Potentially, but later light carriers may carry enough fighters and search aircraft that separate cruiser aircraft become unnecessary.

The scenario stays useful while it follows carrier designs and intended uses repeatedly studied by the Royal Navy; farther downstream, specific outcomes become unreliable.

A cruiser yard and a cruiser-sized crew would suffice; the design could plausibly be built and manned across the Commonwealth.

Probably a more sensible 14,000- to 15,000-ton design closer to a reduced Soryu than to the unsuccessful Ryujo.

Possibly, by funding engine development a year or two earlier, though the effect would be incremental rather than transformative.

Japan would either relax its demanding standards to produce more aviators or expand the same intensive system, with the latter more likely.

Yes: independent reconnaissance and air strikes could alter cruiser battles and make Japanese torpedo attacks more hazardous, but both sides would adapt.

Possibly, although Japan might instead bring the light carriers to Pearl Harbor to increase the main strike's power.

A hangar and its openings undermine pressure-hull design; VLS-launched reconnaissance and strike drones offer a more practical version of the concept.

Yes. The tall hangars in Hermes and Eagle show how larger float-equipped aircraft could be accommodated.

They would more likely free fleet carriers from ASW and scouting, potentially preserving Courageous and Glorious and enabling a much larger Taranto strike.

There would be a fight over control, but aircraft attached to the ships would probably remain under shipboard authority.

Remove the heavy guns and use the saved topweight and space to improve the ship's carrier capabilities.

Yes, though Germany in particular would remain constrained by the loss of research and industrial capacity after the First World War.

By showing that catapults launch heavier aircraft; the harder argument would be adopting steam rather than hydraulic machinery.

Several thousand, with shipyards kept open and wider effects across the economy.

No. The Royal Navy would need the light carriers for too many other station, reconnaissance, and support duties.

Ships in British ports would likely be seized for the Free French; ships in French ports might be sunk or neutralized.

Yes, because aircraft firms would see more money in naval aviation and have reason to support carrier-based requirements.

Not necessarily; Gotland and Sweden's existing infrastructure make a light carrier plausible in this scenario.

No isolated answer is reliable because the scenario has already changed carrier losses, Taranto, Allied deployments, and Japanese calculations.

It might be authorized, but whether the Soviet Union could complete useful carriers before the war is uncertain.

Only slightly: the reserve helps, but proven carrier utility and the need for escorts would also make a pause harder to justify.

No. The strategy needs both cruisers and carriers because their roles are complementary.

Yes. Interwar yards commonly built both naval and commercial ships, so many cruiser-capable yards could take the work.

For an American carrier, the 5-inch; for a British carrier, probably the 4.5-inch. Both are dual-purpose weapons.