With a hull mounted gun we can make the tank shorter, lighter and avoid the add complexity of turret.
Think of the Saint-Chamond
or a StuG III
True, a hull-mount allows us to mount heavier guns. On the other hand, as you've probably noticed, both the Saint-Chamond and the Sturmgeschütz III used a 75mm high-velocity gun, while we're aiming for something with a lower calibre.
By the way, the comparison of StuG III and Panzer III allows us to guess what a turret is worth: The Panzer III mounted, at its best, a 50mm high-velocity gun, while the StuG III mounted a 75mm gun. This suggests we could mount a 50% higher calibre on a casemate mount.
The Hotchkiss Revolving Cannon is 210 Kg so it's some where in that ballpark.
Im more hopeing to reuse the gun's and free up some production.
A very good find, thanks. I had wondered what a similar real-world weapon would look like. Using that, I also found the
NavWeaps site on the same weapon, which includes some images.
However, there is one important difference between these weapons: While the Hotchkiss uses smokeless powder, we're still restricted to blackpowder for our revolving cannon which costs performance. And, aside from performance, blackpowder weaponry produces an awful amount of smoke; I shudder to think of blackpowder smoke in an enclosed tank turret.
On the other hand, Funk's right that our revolving cannon weights significantly less: Probably 210kg vs about 500kg for the (comparable) Bofors 40mm cannon. On the one hand, the Bofors has the disadvantage of being twenty years more advanced. On the other hand, we do not need the firing rate of 120 rounds per minute; 30 rounds per minute sound achievable and sufficient against torpedo boats and biplanes.
The Renault is a fair bit smaller than I was expecting. If we can design a slightly larger one, I think it would work well. I'm thinking something that can have 3-4 people operating it, along the lines of 1 driver, 1 commander, and 1-2 gunners. I'm on board for having the turret as the sooner we start that the sooner we can master it.
We'll probably have to make it heavier; for the gun alone (as indicated above, the 40mm quick-fire gun was 500kg, while the Renault's gun was 200kg).
I'm imagining a wider Renault with two small hull mounts (or armored ports?) one on each side at about a 50 degree angle (with directly right and left of the tank being 0 degrees) with a BIT of swerve in it to cover between 60 degrees and 40 degrees for a HMG each.
Keep in mind that each of these machine guns will require an operator. The driver might operate one (which would probably best be pointed forwards), the commander can operate one. The gunner has his 40mm gun, and might also need to reload (but might use a coaxial gun).
2-3 807 Engines will probably be enough to cover movement as well as the turret's rotation. What I have in mind will probably be somewhat heavier than 10 tons though.
Two should be sufficient for a ten-ton tank. That'd be more power per weight than the Renault FT, and about the same as the T-26.
I'm counting out engineers and I don't think we'll have enough for what we want to do (if we want to hedge our bets on there being as few bugs to work out as possible). Presuming we want the Munitions Testing Facility (probably connected to our World Class Firing Range for testing purposes) and the Aerodynamics Testing Facility (wind tunnels anyone? They've been around since 1871 apparently) over production, we'll have a choice between 2x300t slips, 8x300pp factories, or half of each. I'm in favor of the split. Plus Pi wanted some more Artillery specced factories and we're going to be in need of them for quite a few reasons. 1200pp of new Artillery is going to be quite nice.
We never have enough engineers :-)
I'm always in favour of more artillery, of course. In this case, it's a question of whether the new Swordfish is sufficient, or whether we'll need more production. We'll probably have to wait for next turn's designs, since we probably will have to improve some.