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Possibly ASB....probably by accident but what would be the implications of the UK being able to reliably mass produce solid rocket motors equivalent to those on the OTL Trident II missile. Firstly by end of 1940 Secondly by end 1945 Edit: No-one else has been able to do the same at this...

Difficult politically but if the STS had been developed as in the OTL but using LRB's, what are the potential changes? Most obvious is no Challenger type loss but what else could there be?

Stirling engines were first used in submarines in the late 1980's early 1990's but could they be used sooner to provide AIP? What would be the effect of them being available in the 1930's?

Historically the Verdun forts were mostly disarmed and the garrisons reduced to maintenance only, with some forts being made ready for demolition. What if at the time of the German attack in this area, the forts had remained fully equipped and manned by regular trained troops. Not sure if the...

https://en.wikipedia.org/wiki/London_Electrobus_Company The London Electrobus Company, was a bus operator that ran a fleet of electric buses in London. The electrobus was the first practical battery-electric bus and a forerunner of the electric buses that are experiencing a major resurgence in...

When the Luftwaffe accidentally bombed Dublin in 1941, if the bombing killed Éamon de Valera, does that cause any changes?

One of the feature of the Mercury Redstone project was the proposed parachute recovery system. From wiki The recovery system, at the top of the rocket, would have used two stages of parachutes. In the first stage, a single parachute, 17 feet (5.2 m) in diameter, would stabilize the rocket's...

Possibly ASB....but what if instead of being obsessed with speed, Fisher pushed balanced designs, what does the engineering, armour and guns allow?

Story that has popped up on the HP@CA board http://www.tboverse.us/HPCAFORUM/phpBB3/viewtopic.php?f=6&t=25606 In 1975 a Soviet Krivak class frigate named Storozhevoy and belonging to the Baltic fleet mutinied. The political officer wanted to have another Marxist-Leninistic revolution and took...

What would it take for the Lancaster and the Halifax to have tricycle landing gear rather than tail wheel landing gear and would this change any of their operations?

What were the hanger heights for Furious after her first conversion with a flying off deck forward and a landing on deck aft? What was the height above sea level for the flying off deck and landing on deck following that conversion? Does the design for Furious allow for a full length flight...

If instead of Persia, William Knox D’Arcy had been made aware of reports of oil in Trinidad, British Guiana or West Africa rather than in Persia and had discovered oil there rather than in Persia what effects would not discovering oil in Persia in the early 1900’s have on British involvement in...

Operation Chastity was a planned operation to capture Quiberon Bay and bring its ports into operation for the Allied supply operation but it was continually postponed and eventually cancelled. How much of the supply problem would this one port have been able to reduce? Wiki link here...

Is there a potential driver for the introduction of cargo aircraft with the rear loading ramp of the OTL Hercules etc? If aircraft with rear cargo ramps had been available in the mid 1930's what impact would they have had on freighting duties in WW2?

What would be the effect of no Locomotive or Red Flag acts? https://en.wikipedia.org/wiki/Locomotive_Acts The Locomotive Acts (or Red Flag Acts) were a series of Acts of Parliament in the United Kingdom regulating the use of mechanically propelled vehicles on British public highways during the...

Ralph Pegram’s ‘Beyond the Spitfire; The Unseen Designs of R.J.Mitchell’ describes Mitchell’s design for B.1/35. It had a narrow fuselage less than 6ft at its widest point and carried its entire bombload within the wing to the rear of the spar. It had three gun positions, nose, tail and...

If a quicker construction time had meant either or both Resadiye and Sultan Osman 1 were in Turkish hands in Turkish waters early 1914 what effect would this have?

If Admiral Archibald Berkeley Milne had been incapacitated end July 1914, either in a hospital bed or just plain dead, and unable to be CinC Mediterranean Fleet, who would have taken his place and would ship deployments have changed?

From Janes Fighting Aircraft of World War II In June 1936 Short Bros Ltd in collaboration with Harland and Wolf Ltd formed a new company known as Short and Harland Ltd to build aircraft in Belfast. If Shorts had joined up with another company not in Northern Ireland, what effect would that...

The loss of Indefatigable, Queen Mary and Invincible was down to the magazine handling practices used by the gun crews on these ships at the 'suggestion' of the Admirals to increase the rate of fire. If the proper practices were in operation they would have had destroyed turrets but should have...