In the closing counterfactual, the Royal Navy uses battlecruisers to test major innovations. An all-oil Queen Mary might have reached about 30 knots, while an oil-fired Tiger with 15-inch guns could have provided experience before the Queen Elizabeth class. German planners would then have faced British battlecruisers with a striking speed advantage over their own ships. If the accumulated experience also produced 28-knot Queen Elizabeths, Britain would have gained a formidable fast-capital-ship force from the two approaches to the problem.
Notable Point · 52:44-54:38
An all-oil Queen Mary and a faster battle line
The closing counterfactual asks whether all-oil Queen Mary and 15-inch-gun Tiger trials could have accelerated British fast-capital-ship development.