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The British designed and built Armstrong 100-Ton Gun was the largerst muzzle loaded gun ever developed and came into service with the Italians and the British starting in the the mid-to late 1870s, serving through to the early 1900s. There's an interesting story that goes something like, the British Armstrong company design the 100-Ton gun and offered it to the British Royal Navy. The RN begged off, and Armstrong then shopped it around finding the Italians, who promptly put it onto their latest pre-dreadnoughts. This became a tactial threat to British installations in the Mediterranean and the RN subsequently put in orders for 4: two at Malta and two at Gibraltar.
The Armstrong could throw its 2000 lbs (908 kgs), 450 mm diameter (17.72"), shell downrange approximate 3.75 miles (6600 yds, 6035 m). The land installation Armstrong was serviced by a suprisingly small crew of 6 as it had an integrated steam and hydraulic loading and travesring mechanism. This also led to the rapid 6 minute cycle time. The Armstrong never fired in anger and two exist today (one in Malta, one in Gibraltar).
Another esoteric interest of mine is large caliber muzzle loading coastal/siege/naval guns. You can see a lot of American Civil War era artillery of this type traveling up and down the US East coast, stopping in at places like Fort Pulaski, Fort Sumter, Fort Moultrie, Fort Mcallister, etc. At the end of the day there is essenntially no market for items like this, I did it for myself as a project to try out my new Anycubic printer to see if I could speed up the design to market time. And indeed it did, however I did get bogged down by the CAD inasmuch as I kept stumbling onto better and better references.
This is an enchanced visual representation of the Armstrong 100-Ton gun. It looks right for the most part, especially considering the design-scale.
This has literally been merely scaled up from my original 1/192 version so I can't vouch for a second on how that executes in 1/35. Details simiplified for the more forgiving smaller scale might look rediculous at 1/35. I'm doubtful, and, at the asking price, I know, this isn't realistic to begin with. This is more just to show how price gets way out of hand as you go up the scale chain. Granted, 1/192 to 1/35 is a pretty big jump.