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This siggestion is about the Jules Michelet Armoured cruiser designed by Émile Bertin. While à rather old type of ships we already have 2 instances of such vessels in game and as you will see here the Jules Michelet would be à rather great 5.3 to 5.7 heavy cruiser like ships.
Short History:
Being laid down in June 1904 the Jules Michelet was derived from the Léon Gambetta design of which it takes most design specificities with à mostly identical hull but more importantly it had stronger engines; the design goal being to bring the speed up by half a knot or so compared to the previous Gambetta. Also while ditching the previous twin turret for the secondary armament; a newer longer 194/50 Mle 1902 were introduced replacing the 194/45 of the previous classes.
Launched the 31st of August 1905 the Jules Michelet started her trials only in August 1908 where she achieved a consistant 22.86knots speed.
After her trials she joined the 1st Light Division with Jules Ferry and Victor Hugo. From 1912 until November 1913 she then was attached to the gunnary school were she suffered a powder explosion in one of her turret but wasnt to badly damaged and continue her services; mainly serving in the Méditerranée and the Adriatic during the first world war. After the war she participated to the evacuation of the serbian army in 1916 and serving later to assist greece in one of its Turkish/greek war. Jules michelet also was part of the DNEO startkng from 1922; visiting Australia by the same occasion in 1923. She eventually was sunk as a target ship the 8th of may 1937 by the submarine Thétis.
Some stats for the ship:
Length: 146.50m
Beam: 21.4m at the water line
Draught: 8.18m aft
Displacment: 12600t
Speed: 22.86knot (42.33 km/h)
Crew complement: 750 men and 22 officers
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Mobility:
Thanks to its New engines consisting of 28 boilers developping on trials 30,438CV and resulting to a 22.86knot speed; compared to the 29,000CV and 22.5knot designed speed.
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Armament:
The weaponry consisted of 4 different weapons.
Four 194mm/50 Mle 1902 in 2 twin turret fore and aft formed the main armament. Its fired 2 type of rounds: an APC; the Mle 1902 and a SAPC also named Mle 1902; and at a rather high velocity of 950m/s. The main guns were able to elevate up to 15° and had -5° of minimal elevations.
The secondary weapons were comprised of a battery of twelve 164.7mm/45 Mle 1893-1896M QF placed in eight single turret and four casemate mounts. It fired 3 type of ammo being the APC, the SAPC and the CI (HE) shell; although CI wasnt in uses by 1900 already being replaced by the SAPC. The 165.7mm turret had -10/+25° elevations.
The tertiary weapons were 24×47mm/50 Mle 1902 QF in single mounts.
The weponnery was rounded out by a set of 2 submerged torpedo tube with 8 torpedoes of 450mm Mle 1904.
The main guns were directed by a pair of Barr & Stroud FG2 2-metre rangefinder one fore and one aft on the superstructure.
Summary:
4× 194/50 guns 30s firing cycle
12×164.7/45 guns 20s firing cycle
24×47mm/50 guns
2× torpedo tubes with 8 torpedo reload
Shells:
for the 194mm:
APC Mle 1902: It was 2.71Cal long; weight 86kg and had 1.40kg of Mélinite as bursting charge
SAPC Mle 1902: it was 3.04cal long; weight 86kg with 4.30kg of Mélinite as bursting charge.
For the 164.7mm:
APC: It was 2.62cal long, weight 54.9kg and had 0.97kg of melinite filler.
SAPC: It was 2.94 cal long, weight 52.3kg and had 3.10kg of melinite filler.
CI (HE): It was 3.12 cal long; weight 45kg and with a filler of 2.10kg black powder.
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Magazines positions: 
Firing arcs of the guns:
Protection:
The armor protection was quite extensive; the belt being 150mm at the water line; 650mm above and 500mm under the water line; with à 130mm upperstrake; and a forward and rear belt of 80/90 and 70/80 repsectively.
Summary:
Belt: 150mm
Upper belt: 130mm
Deck: 35mm
Main turret: 156mm all around; 344mm rear; 147mm barbette, 17+17+17mm roof and 102mm lower barbette.
Secondary turret: 122mm face; 102mm side; 145mm rear; 15+10+10mm roof; 103mm barbette; 40mm fir the amunition hoist
Casemate: 138mm and 64mm inner walls
Conning tower: 174mm front; 140mm rear
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Some extra images:
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Sources: John Jordane and Phippe Caresse: French Armoured Cruisers 1887-1932 chapter 8
*France 164.7 mm/45 (6.5") Models 1891, 1893, 1893-1896 and 1893-1896M - NavWeaps