Making a civil war general...
Picking out the tires and painting the tracks in black. As you can see, I am not a gatekeeper when it comes to paint shades.
The gearbox had five forward and one reverse gears. The first gear was for "confined spaces, on steep inclines or...sharp turns". The transmission was the new Merrit-Brown Z.5, which offered differential steering without clutching or braking, a major advance on previous designs. It gave the Cromwell superb manoeuvrability.
The Meteor engine delivered 540 hp at 2,250 rpm giving the Cromwell speed as well as manoeuvrability. This was the maximum rpm, which was limited by governors built into the magnetos. Fuel consumption on "pool" petrol (67 octane) was between 0.5 and 1.5 miles per gallon depending on terrain.
The armour on the Cromwell ranged from 8 mm (0.31 in) up to 76 mm (3.0 in) thick overall. On all-welded vehicles built by BRC&W, the weight saved by the welding allowed for the fitting of additional appliqué armour plates on the nose, vertical driver's plate and turret front, increasing the maximum thickness there to 102 mm (4.0 in). These vehicles are identified by their War Department numbers carrying the suffix W, e.g. T121710W. The armour compared well with that of the Sherman, although the Cromwell did not share the Sherman's sloped glacis plate.
Cromwell was the fastest British tank to serve in the Second World War, with a top speed of 40 mph (64 km/h). This speed was extremely beneficial in both attack and defence, outmanoeuvring opponents. At least one case is known of vehicle commanders using the vehicle's fast speed to jump large gaps. In the Netherlands, a troop of three Cromwells was able to leap a 20 ft (6.1 m) wide canal when surprised by enemy forces.
Is it a bird, is it a plane...?
This speed proved too much for even the Christie suspension and in later models the final drive ratio was changed to lower the top speed to 32 mph (51 km/h), which was still fast for its time.
The Cromwell's speed and low profile gave an advantage over the Sherman however, giving the tank the element of surprise and making return fire more difficult. Cromwell crews in North-West Europe succeeded in outflanking the heavier and more sluggish German tanks with superior speed, manoeuvrability and reliability.
Following British tank doctrine of the time, the Cromwell was designed to fire on the move. The turret offered hydraulically powered turret traverse motors with proportional speed control. Later vehicles fitted an all-round view cupola for the commander to identify and track targets. Both gunner and commander had rotating and pivoting Vickers Gundlach tank periscopes, while fixed episcopes were fitted in the cupola. There was a 7.92 mm Besa machine gun mounted co-axially to the main armament, operated by the gunner. A second was gimbal mounted in the front of the hull, with 45 degrees horizontal and 25 degrees vertical movement. Sighting was by a No. 35 telescope, which was connected through a linkage to the mounting. In the top of the turret was a 2-inch "bomb thrower" angled to fire forward. Thirty smoke grenades were carried for it.
Following British tank doctrine of the time, the vehicle was designed to fire on the move. The turret offered hydraulically powered turret traverse motors with proportional speed control. Later vehicles fitted an all-round view cupola for the commander to identify and track targets. Both gunner and commander had rotating and pivoting Vickers Gundlach tank periscopes, while fixed episcopes were fitted in the cupola. There was a 7.92 mm Besa machine gun mounted co-axially to the main armament, operated by the gunner. A second was gimbal mounted in the front of the hull, with 45 degrees horizontal and 25 degrees vertical movement. Sighting was by a No. 35 telescope, which was connected through a linkage to the mounting. In the top of the turret was a 2-inch "bomb thrower" angled to fire forward. Thirty smoke grenades were carried for it.
Early models of the Cromwell were equipped with the QF 6-pounder (57 mm). Using the new armour-piercing discarding sabot round, which became available in quantity in early 1944, this gun could penetrate over 100 mm of steel armour at ranges on the order of 1,000 yards (910 m), making it effective against all but the most heavily armoured tanks. However, British tankers had long complained about this weapon's lack of a useful high explosive (HE) round for attacking soft targets like trucks, anti-tank guns and infantry defences.
This problem was eventually solved by the realisation that the 6-pounder could be bored out to 75 mm and fire unmodified US ammunition. While this would lead to less anti-tank performance, this was considered a reasonable trade-off in exchange for the rapid introduction of the HE rounds. The resulting ROQF 75 mm could be easily swapped out with the 6-pounder, and newly built models mounting the gun were known as the Mark V.
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