Sturgeon
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Everything posted by Sturgeon
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On the Derebus, it looks like the gun could be lowered a bit? That might save some height & mass. Also what is your recoil stroke? For an MBT, 14-16" is pretty normal I think. -
Reposting this here for our contestants' reference Height: 80mm plates making up 78% of perimeter, glacis making up 6%, rear (thinnest) 6% Width: 25-37mm plates making up 81% of perimeter, glacis making up 19% Length: 80mm plates making up 34% of perimeter, 25mm plates making up 66% those are for Comanche's hull also, only length adds track run so if you need more volume, make your tank longer, and for the love of god do not make your tank hull taller also you'll notice that raised engine decks are awesome
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I am going to be introducing a new recommended weight accounting method to help standardize results between contestants, and to better prepare them for the judges' ire. This method is not mandatory, however it is strongly recommended, as it is expected to be the method by which the judges weigh (literally) each entrant against each other. First, we are requiring in addition to the standard elements included on the submission sheet, that you include the armor mass of your tank in your submission. The armor mass includes any armor elements of your tank, including in addition to armor arrays, also structural elements like a cast or welded hull body, skirts, armored engine decks, hatches, etc. Next, to calculate the combat weight of your tank (as outlined in the submission template), you take the armor mass of your tank, and multiply it by 0.45 to get the mass of suspension components for your tank (this includes tracks, roadwheels, sprockets, swing arms, idler tensioners, return rollers, etc). The reason for doing this is that as suspended mass increases, the mass of the suspension must increase also, meaning that in successful tank designs this ratio of about 0.45 stays remarkably constant (as detailed in Technology of Tanks). Then, add the armor mass and the suspension mass together with these figures: Gun weight: (variable) Ammunition weight: (variable) Ammunition racks weight: (variable, but in the absence of a modeled weight for them, 1,700 lbs is a fine figure) Gun stabilization system and gun electrics: 1,700 lbs for a ~4.7 inch gun (cubic scaling according to caliber, with minimum of 1,000 lbs) Engine weight: (variable) Transmission weight: (variable) Fuel weight: (variable, but if you haven't modeled it for your tank, then use the value required to meet the range requirement) Fuel system weight: 750 lbs Electrical and environmental systems (combined): 3,500 lbs Optics, sighting: 300-500 lbs (depending on complexity) Fitments, stowage, and installed equipment: 7,500 lbs Any other objects you've modeled, like cupolas etc: (variable) Crew: 265 lbs per crewman This means that if I have modeled a tank's armor, which weighs 18 tons for the hull and 12 tons for the turret (including arrays, engine deck, armored hatches, etc), my math will look like this: 18 + 12 = 30 tons hull (incl. skirts) and turret 30 x 0.45 = 13.5 tons suspension 13.5 + 30 = 43.5 tons hull, turret, and suspension 43.5 * 2,205 = 95917.5 lbs hull, turret, and suspension 95917.5 + 5300 lbs gun 2,650 lbs ammunition 1,700 lbs ammo racks 2,000 lbs gun stabilization and electrics 4,950 lbs engine 5,400 lbs transmission and final drives 3,660 lbs fuel 750 lbs fuel system 3,500 lbs electrical and environmental 500 lbs optics 7,500 lbs fitments, etc 265 lbs * 4 crew = 134887.5 lbs combat weight for the tank, or 61.2 metric tons.
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That's unbelievably light!
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What's most important is that, regardless of the damage to vehicle or harm to the crew, the spirit of international socialism libertarian anarcho-capitalism lives on!
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Hilariously, Kalashnikov USA is beating the pants off KC for QC!
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Copying this from discord because it's important: Challenger sheet:
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"Protection" means that at least one atom of formerly-tank vapor must survive.
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Well you know, it is a lot of reading...
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Based on the tech level I've outlined they could just make them without much trouble.
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Yes but several people in the competition do have finals.
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GET IN LOSER, WE'RE HUNTING MORMONS
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OK, it's encouraged for those with finals to be done by June, but the hard deadline will be later. June 15? Or do we need a July date?
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So it looks like I'm going to be legalizing laser rangefinders for technical reasons, but requiring an optical system as a backup.
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Ok we're setting June 1 provisional which is primarily because some guys have finals. But it's accepted that there will be an extension as needed.
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Since everyone seems to be coming along, how do we feel about a June 1 deadline?
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As those of you on the Discord may know, I'm basically redesigning my entire tank (yes, really). Starting with the gun, which was far too large. Here's the new gun, which you're all free to use: https://mega.nz/file/71tgEJzZ#DhZ3JCiHIaUy60hBch2rtBNt_6X3VzVjMmygTn4gqzk So much room!
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I recommend the Diehls. My wheels are based on the US specification (used in more or less the same form from M48->M1), and they're 60kg per wheel. Two wheels per swing arm, eight roadwheels per side on your tank, that's about two tons. If you take your armor weight and divide it by 0.55 you should get a good minimum all up weight value. If you don't reach that weight, time to look for things that may be too fragile (like suspension).
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In terms of the field here, my tank is middling weight. Starting engine is 1200hp bored out 1790 equivalent, with upgrade to a 1500hp MB 873 equivalent. What drove the mass largely was the highly festooned hull, which is a bit bigger than usual and as you can see well protected by eleven ton side skirts. Height is 2.8m so nothing exceptional.
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M1A2C. My tank is sitting at 72 m.t.
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Nah, it's fine.
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Can't be stealth if you're all smooth and stuff!
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With stealth seeking missiles!
