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  • Abrams TTB

    Has anyone had any thoughts about the Abrams TTB (Tank Test Bed) demonstrator and how it might have developed into an operational vehicle
    It seems GDW might have used the TTB and how it would be as a production vehicle with their Abrams "Giraffe" (which is essentially a refined version of the concept).

    I haven't seen much online about the TTB but as it was a demonstrator, it's not like it had a huge presence anyway.
    Here's a few pages about it: -


    The M1 Tank Test Bed (TTB) was a late-80s prototype to test unmanned turret design concepts and compare them to a modern, manned-turret design: the then-state-of-the-art M1A1. The TTB was not neces…

    My friend found two extremely rare photos of TTB (Tank Tes Bed) and CATTB (Components Advanced Technology Test Bed). TTB, designed and builded around 30 years before anyone dreamed about T-14 "Armata", what a shame it was never pushed to prototype stage. CATTB, there was no other photo showing th...
    Last edited by StainlessSteelCynic; 08-03-2020, 04:59 AM. Reason: Removing the second "be" in "... how it would be be as a production vehicle..."

    Comment


    • Airfox

      Aircraft don't make it into most T2k campaigns, and Romania probably isn't a setting many (if any) most ref's/players have any experience using, but here's an attack helicopter that almost was.



      It's featured in Modern Fighting Helicopters by Gunston & Spick (1988)- they thought it was a promising platform that would see a lot of interest/orders from developing nations, given its price-point and tried-and-true engine (it's based on the Alouette III) but, after the Romanian revolution, the project was cancelled. AFAIK, only a couple of prototype/demonstrators were built.
      Author of Twilight 2000 adventure modules, Rook's Gambit and The Poisoned Chalice, the campaign sourcebook, Korean Peninsula, the gear-book, Baltic Boats, and the co-author of Tara Romaneasca, a campaign sourcebook for Romania, all available for purchase on DriveThruRPG:

      https://www.drivethrurpg.com/product...--Rooks-Gambit
      https://www.drivethrurpg.com/product...ula-Sourcebook
      https://www.drivethrurpg.com/product...nia-Sourcebook
      https://www.drivethrurpg.com/product...liate_id=61048
      https://preview.drivethrurpg.com/en/...-waters-module

      Comment


      • Originally posted by Raellus View Post
        Aircraft don't make it into most T2k campaigns, and Romania probably isn't a setting many (if any) most ref's/players have any experience using, but here's an attack helicopter that almost was.



        It's featured in Modern Fighting Helicopters by Gunston & Spick (1988)- they thought it was a promising platform that would see a lot of interest/orders from developing nations, given its price-point and tried-and-true engine (it's based on the Alouette III) but, after the Romanian revolution, the project was cancelled. AFAIK, only a couple of prototype/demonstrators were built.
        I'll call your bluff and raise you the Cheyene... Now updated and appearing as the RAIDER X!



        Last edited by swaghauler; 08-11-2020, 05:38 PM. Reason: added a link

        Comment


        • A mix-and-match firearm this time, the LeMat Carbine. Yes, the carbine, not the revolver. Well, sort of the revolver...it's complicated.

          You see, Doctor Colonel Jean Alexandre LeMat wanted to produce long arms in addition to his 9-shot revolvers with shotgun goodness in the center. So he produced 9-shot revolving carbines with either shotgun or rifle goodness in the center. Around 200 of these were made, and the handful of survivors vary in caliber for both the central barrel and the surrounding revolver. All have 20" barrels and I estimate the weight at 4.5 kilograms (seriously, if anyone can find an actual weight, I'd appreciate it, because Google is failing me on that point of research).

          Revolver options:
          Original (10.668x47mmBP Conical)
          Dam 2, Pen Nil, Ammo 9i, ROF SAR, Bulk 6, SS 1, Rng 74
          Pinfire (11mm French Ordnance)
          Dam 2, Pen Nil, Ammo 9R, ROF SAR, Bulk 6, SS 1, Rng 59

          Center options:
          .56 rifled (14.224x31mmBP Conical)
          Dam 3, Pen Nil, Ammo 1i, ROF SAR, Bulk 6, SS 3, Rng 98
          .58 rifled (14.732x31mmBP Conical)
          Dam 3, Pen Nil, Ammo 1i, ROF SAR, Bulk 6, SS 3, Rng 102
          20 gauge shotgun
          Dam 9 (close)/1x11 (medium), Pen Nil, Ammo 1i, ROF SAR, Bulk 6, SS 1, Rng 12

          The powder charge is probably a little high for the original revolver load (it's roughly 63 grains), but I was trying to maximize range. The .56 rifled is a 74 grain load and .58 rifled is a 79 grain load. Again, they were calculated to maximize range using FF&S.

          The 9i for reload on the first option is because it's a lead bullet loaded over loose powder, so it's slower to reload than the self-contained pinfire cartridges. The shotgun range I'm not 100% sure on, because I'm terrible at using FF&S to generate shotgun stats. For the shotgun beyond close range, treat it as a 5-round burst and two 3-round bursts.

          While the carbine was apparently made into the centerfire era, I haven't seen any records of what calibers were manufactured, and I'm not sure any of them are among the 18 known survivors.
          The poster formerly known as The Dark

          The Vespers War - Ninety years before the Twilight War, there was the Vespers War.

          Comment


          • Originally posted by Vespers War View Post
            A mix-and-match firearm this time, the LeMat Carbine. Yes, the carbine, not the revolver. Well, sort of the revolver...it's complicated.

            You see, Doctor Colonel Jean Alexandre LeMat wanted to produce long arms in addition to his 9-shot revolvers with shotgun goodness in the center. So he produced 9-shot revolving carbines with either shotgun or rifle goodness in the center. Around 200 of these were made, and the handful of survivors vary in caliber for both the central barrel and the surrounding revolver. All have 20" barrels and I estimate the weight at 4.5 kilograms (seriously, if anyone can find an actual weight, I'd appreciate it, because Google is failing me on that point of research).

            Revolver options:
            Original (10.668x47mmBP Conical)
            Dam 2, Pen Nil, Ammo 9i, ROF SAR, Bulk 6, SS 1, Rng 74
            Pinfire (11mm French Ordnance)
            Dam 2, Pen Nil, Ammo 9R, ROF SAR, Bulk 6, SS 1, Rng 59

            Center options:
            .56 rifled (14.224x31mmBP Conical)
            Dam 3, Pen Nil, Ammo 1i, ROF SAR, Bulk 6, SS 3, Rng 98
            .58 rifled (14.732x31mmBP Conical)
            Dam 3, Pen Nil, Ammo 1i, ROF SAR, Bulk 6, SS 3, Rng 102
            20 gauge shotgun
            Dam 9 (close)/1x11 (medium), Pen Nil, Ammo 1i, ROF SAR, Bulk 6, SS 1, Rng 12

            The powder charge is probably a little high for the original revolver load (it's roughly 63 grains), but I was trying to maximize range. The .56 rifled is a 74 grain load and .58 rifled is a 79 grain load. Again, they were calculated to maximize range using FF&S.

            The 9i for reload on the first option is because it's a lead bullet loaded over loose powder, so it's slower to reload than the self-contained pinfire cartridges. The shotgun range I'm not 100% sure on, because I'm terrible at using FF&S to generate shotgun stats. For the shotgun beyond close range, treat it as a 5-round burst and two 3-round bursts.

            While the carbine was apparently made into the centerfire era, I haven't seen any records of what calibers were manufactured, and I'm not sure any of them are among the 18 known survivors.
            I know you do good work... but these formulas in FF&S and WTG are STILL driving me crazy. Here are weapons with a fairly low sectional density and TERRIBLE Ballistic Coefficient being driven by [low velocity] BLACK POWDER to boot. Yet when I even run the formulas you get SHORT RANGES around a hundred meters in a game where high-velocity smokeless powder loads with excellent Ballistic Coefficients are hitting 75m to 80m max. The Range formula seems off by at least 1/3 too much. I noticed this in your entries on the Primitive Weapons Thread too. I think the Forum needs to brainstorm the modification of those formulas.

            Comment


            • On my quest to make the perfect Twilight 2000 Sheridan I think I've finally found it.

              Believe it or not but way back in 1967 there was already concerns that the M81 (as it was then) Gun/Launcher may not be a good idea. As such Rock Island Arsenal did a crash program of four other weapon systems to fit in the M551 turret should the M81 develop problems.

              Of the four only two were recommended mainly due to space problems, although it was mentioned that if serious redesign work was done all four would fit in the turret. The two weapon systems were:

              - M32 76mm Cannon, the same as was on the M41 Walker Bulldog
              - XM180 105mm Gun/Howitzer from the XM104 super mobile lightweight howitzer (which really should have gone into service)

              Of the two the XM180 was the preferred weapon system as it coupled low pressure and trunnion loading with high damage output and ammunition that was still largely in service.
              This weapon fired much faster than the existing M81 because it didn't need a compressed air purge to blow out the bore so the combustible cartridge cases wouldn't ignite prematurely. It's likely that by the time of the Twilight War an A1 version of the gun/howitzer would have been developed with a bore evacuator for even faster firing. Notably the XM108 could fire any 105mm howitzer ammunition in US stocks and new racks for the vehicle gave a stowage of 50 Rounds. (I note the UK ammo has a squash head round)

              If the M551A1 is the M81-armed standard version with vision upgrades and a minor modernisation package that would make the M32 76mm the M551A2A1 and the XM108 105mm the M551A3A1

              Here's an image of the gun way back in 1967

              Comment


              • Raison d'etre

                That's an interesting concept, Chalk. The XM180 would make a great light assault gun for MOUT*, but it kind of loses the Sheridan's raison d'etre as an AT-capable light tank for Airborne forces.

                Was there ever an AT round developed for 105mm howitzers Something that could be used when the SHTF

                *And with "Beehive" rounds, it would be deadly against infantry in the open.
                Author of Twilight 2000 adventure modules, Rook's Gambit and The Poisoned Chalice, the campaign sourcebook, Korean Peninsula, the gear-book, Baltic Boats, and the co-author of Tara Romaneasca, a campaign sourcebook for Romania, all available for purchase on DriveThruRPG:

                https://www.drivethrurpg.com/product...--Rooks-Gambit
                https://www.drivethrurpg.com/product...ula-Sourcebook
                https://www.drivethrurpg.com/product...nia-Sourcebook
                https://www.drivethrurpg.com/product...liate_id=61048
                https://preview.drivethrurpg.com/en/...-waters-module

                Comment


                • Seem to recall the M101 howitzer having a HEAT round. While not a sabot round, it can have a decent punch if used in the correct way.

                  Comment


                  • Originally posted by swaghauler View Post
                    I know you do good work... but these formulas in FF&S and WTG are STILL driving me crazy. Here are weapons with a fairly low sectional density and TERRIBLE Ballistic Coefficient being driven by [low velocity] BLACK POWDER to boot. Yet when I even run the formulas you get SHORT RANGES around a hundred meters in a game where high-velocity smokeless powder loads with excellent Ballistic Coefficients are hitting 75m to 80m max. The Range formula seems off by at least 1/3 too much. I noticed this in your entries on the Primitive Weapons Thread too. I think the Forum needs to brainstorm the modification of those formulas.
                    I think the problem is with smokeless more than BP. The Springfield Model 1855 rifle-musket was noted to be effective to 500 meters and deadly to 1 kilometer, firing 14.7x23.5mm BP Conical (.58 with 60 grains of powder) from a 101.6 cm barrel. Arguably the range should be around 125 so that it has 125/250/500/1000 as its range bands, using long as effective range and extreme as the range at which it can (with major luck) inflict casualties. Actual calculated range is 89, which is 28.8% low. I know from tests a while back that the formulas really have problems with the Whitworth, which hit targets at 1.8 kilometers in trials.

                    The GDW rules also don't have a good way to simulate the trajectory problems of black powder that required better range estimation than with high-velocity small-caliber smokeless powder. Black powder rifles had plenty of accurate range, but they needed accurate range estimation to be of any use, and that's something that could probably use a house rule.

                    I think the problem for the LeMat specifically is that I went for the powder charge that maximized range, which is almost certainly heavier than what was used, since the .58 BP exceeds the service charge for the rifle-musket. I don't know what charges were actually used, and lighter charges would reduce range.
                    The poster formerly known as The Dark

                    The Vespers War - Ninety years before the Twilight War, there was the Vespers War.

                    Comment


                    • Originally posted by Raellus View Post
                      That's an interesting concept, Chalk. The XM180 would make a great light assault gun for MOUT*, but it kind of loses the Sheridan's raison d'etre as an AT-capable light tank for Airborne forces.

                      Was there ever an AT round developed for 105mm howitzers Something that could be used when the SHTF

                      *And with "Beehive" rounds, it would be deadly against infantry in the open.
                      Originally posted by micromachine View Post
                      Seem to recall the M101 howitzer having a HEAT round. While not a sabot round, it can have a decent punch if used in the correct way.
                      (A lot of this is cut-and-pasted from the FB page)

                      Importantly this whole process was reversible. You could swap guns and racks in a few hours.

                      The way I see this thing going down is that the ammo for the M81E1 is going to get used up and they simply don't make it anymore. At that point these weapons and racks are shipped out to divisional workshops and the systems swapped over. M81E1s in still good condition are shipped back up the chain to where the few remaining M551 units are that are near supply chains that have the ammo as spares.
                      Yes, it does lose tank-killing ability but hey, TOWs are everywhere. If the crew really want to go tank hunting they can keep a MILAN in the bustle rack

                      Otherwise they have two jobs; the first is skirmishing with other recon assets. Now the flyboys and the satellites are gone it's back to going-out-and-having-a-look. This means you'll be meeting PT-76s (which, as I posted earlier on a long micro-essay, isn't actually a scout vehicle but something entirely else), BRDMs and the odd BMP.
                      The second is infantry support. Unlike IFVs the big honking gun can drop entire buildings and break open bunkers. They were actually used like this in Panama.

                      The "beehive" rounds were the famous APERS-T. It was used extensively in Vietnam in anything that used a low recoil barrel.
                      It's been replaced with a special airbust setting on the various fuzes that lets you use standard shells, this is the mechanical time–super quick (MTSQ) fuze. With this you can set the shell to blast nearby targets but it also gets those in trenches, crawling or otherwise in cover.
                      Who'd be an infantryman
                      I'd still put one or two APERS-Ts in the rack if I had a chance for targets of opportunity.

                      Elsewhere we've done some discussion on what the range and rate of fire would be.
                      Now, obviously the default information for this would be Paul's standard NATO 105mm howitzer. However I don't know which gun Paul based this on, and if it was a semi-automatic breech as is on the XM180 mentioned or the manual interrupted screw on the M103 105 mm Howitzer off the M108 (they tried to fit this originally and it would have meant moving traverse gear, something they didn't want to do). Also howitzer fire rates are based on "sustained fire" shooting, whereas direct fire rates are usually much higher as you're essentially in a shit-has-hit-the-fan situation. I'm not sure what if the direct fire range listed in Paul's rules are the same as something with a dinky little barrel like the XM180. I'll leave that answer for the specialist cannon-cockers here.
                      Last edited by ChalkLine; 08-18-2020, 06:23 PM.

                      Comment


                      • Originally posted by ChalkLine View Post
                        On my quest to make the perfect Twilight 2000 Sheridan I think I've finally found it.

                        Believe it or not but way back in 1967 there was already concerns that the M81 (as it was then) Gun/Launcher may not be a good idea. As such Rock Island Arsenal did a crash program of four other weapon systems to fit in the M551 turret should the M81 develop problems.

                        Of the four only two were recommended mainly due to space problems, although it was mentioned that if serious redesign work was done all four would fit in the turret. The two weapon systems were:

                        - M32 76mm Cannon, the same as was on the M41 Walker Bulldog
                        - XM180 105mm Gun/Howitzer from the XM104 super mobile lightweight howitzer (which really should have gone into service)

                        Of the two the XM180 was the preferred weapon system as it coupled low pressure and trunnion loading with high damage output and ammunition that was still largely in service.
                        This weapon fired much faster than the existing M81 because it didn't need a compressed air purge to blow out the bore so the combustible cartridge cases wouldn't ignite prematurely. It's likely that by the time of the Twilight War an A1 version of the gun/howitzer would have been developed with a bore evacuator for even faster firing. Notably the XM108 could fire any 105mm howitzer ammunition in US stocks and new racks for the vehicle gave a stowage of 50 Rounds. (I note the UK ammo has a squash head round)

                        If the M551A1 is the M81-armed standard version with vision upgrades and a minor modernisation package that would make the M32 76mm the M551A2A1 and the XM108 105mm the M551A3A1
                        I believe there were only three different weapons tested. Two of the four were the M32 76mm, one with the M76 recoil system (from the M41) and the other using an adapted M81E12 recoil system (from the M551).

                        Assuming the XM180 uses the same ammunition as the M101 howitzer, the M327 HESH/HEP round would be available, with an 80% chance of spalling 5 inches of armor at 60 degrees obliquity. If any M67 HEAT was still around, it would also be usable, but IIRC it was replaced by the M327 pretty quickly in the late 50s.
                        The poster formerly known as The Dark

                        The Vespers War - Ninety years before the Twilight War, there was the Vespers War.

                        Comment


                        • Another benefit of Beehive rounds is that because they don't use HE, they are often quite effective for creating entry points into buildings or through walls (without the risk of explosive throwing its blast or debris back onto the vehicle or accompanying troops).

                          Comment


                          • Originally posted by Vespers War View Post
                            I believe there were only three different weapons tested. Two of the four were the M32 76mm, one with the M76 recoil system (from the M41) and the other using an adapted M81E12 recoil system (from the M551).

                            Assuming the XM180 uses the same ammunition as the M101 howitzer, the M327 HESH/HEP round would be available, with an 80% chance of spalling 5 inches of armor at 60 degrees obliquity. If any M67 HEAT was still around, it would also be usable, but IIRC it was replaced by the M327 pretty quickly in the late 50s.
                            Yeah, the 76mm was tested twice; once with it's own recoil system and once with the M81 recoil system.

                            Comment


                            • I've recalculated the numbers for the LeMat using best guesstimates of powder charges. The decimal measurements are caliber and grains of powder (i.e. .42-16 is a .42" ball and 16 grains of powder). The shotgun has two statlines for ball and for shot.

                              The 60 grain load for the .56 is the midpoint of what was used in Civil War carbines (Merrill's used 50 grains, Colt's 60 grains, and Burnside's 75 grains), while the 75 grain load for the .58 matches the rifle-musket. Barrel lengths are 19.687" (50cm) for the revolver and 17.375" (44.1325cm) for the center.

                              Pinfire and centerfire carbines would tend to have the shotgun barrel, while the muzzle-loader might have any of the center barrels. The 9R calibers will still be slow to load, since they require single ejection of spent cases with a non-spring-loaded punch and single loading of new rounds through a gate.

                              LeMat Carbine
                              Revolver loads
                              .42-16 (10.668x12mmBP Ball)
                              Dam 1, Pen Nil, Ammo 9i, ROF SAR, Bulk 6, SS 1, Rng 35
                              12mm Perrin Pinfire (12x15mmR BP Conical)
                              Dam 2, Pen Nil, Ammo 9R, ROF SAR, Bulk 6, SS 1, Range 62
                              11mm French Ordnance Centerfire (11.47x17mm BP Conical)
                              Dam 2, Pen Nil, Ammo 9R, ROF SAR, Bulk 6, SS 1, Range 63

                              Center barrel loads
                              .56-60 Rifled (14.224x25.2mmBP Conical)
                              Dam 2, Pen Nil, Ammo 1i, ROF SAR, Bulk 6, SS 2, Rng 87
                              .58-75 Rifled (14.732x29.35mmBP Conical)
                              Dam 3, Pen Nil, Ammo 1i, ROF SAR, Bulk 6, SS 2, Rng 81
                              20-gauge slug (15.75x13.7mmBP Ball)
                              Dam 2, Pen Nil, Ammo 1i, ROF SAR, Bulk 6, SS 1, Rng 23
                              20-gauge shot
                              Dam 11 (close)/1x15 (medium), Pen Nil, Ammo 1i, ROF SAR, Bulk 6, SS 1, Rng 12
                              The poster formerly known as The Dark

                              The Vespers War - Ninety years before the Twilight War, there was the Vespers War.

                              Comment


                              • Originally posted by Vespers War View Post
                                I think the problem is with smokeless more than BP. The Springfield Model 1855 rifle-musket was noted to be effective to 500 meters and deadly to 1 kilometer, firing 14.7x23.5mm BP Conical (.58 with 60 grains of powder) from a 101.6 cm barrel. Arguably the range should be around 125 so that it has 125/250/500/1000 as its range bands, using long as effective range and extreme as the range at which it can (with major luck) inflict casualties. Actual calculated range is 89, which is 28.8% low. I know from tests a while back that the formulas really have problems with the Whitworth, which hit targets at 1.8 kilometers in trials.

                                The GDW rules also don't have a good way to simulate the trajectory problems of black powder that required better range estimation than with high-velocity small-caliber smokeless powder. Black powder rifles had plenty of accurate range, but they needed accurate range estimation to be of any use, and that's something that could probably use a house rule.

                                I think the problem for the LeMat specifically is that I went for the powder charge that maximized range, which is almost certainly heavier than what was used, since the .58 BP exceeds the service charge for the rifle-musket. I don't know what charges were actually used, and lighter charges would reduce range.
                                GDW went with what is termed "practical accuracy" which is what the average shooter could pull off "in the field." What you are modeling would be called "mechanical accuracy" or "benchrested accuracy" for expert shooter or shooters using controlled conditions. My issue with changing the four range band model of RAW is that you will break the practical accuracy of both pistols and SMGs if you change the formula to properly address the maximum "mechanical" or benchrested range of rifles using the four range bands.

                                I agree with you that GDW needed to take into account the effective long-ranged accuracy but I think they just needed to add one more Range Band. The Maximum Effective Range band. This would allow those spectacular shots that are legendary today. I also agree with optics, bipods, and tripods adding to the Base Range. I just think they didn't go far enough with scopes. Why do I add another Range Band Just look at what happens with the M16A2

                                Short Range = 55m, Snap Shot: Average (Skill), Aimed Shot: Easy (Skillx2)
                                Medium Range = 110m, Snap Shot: Difficult (1/2Skill), Aimed Shot: Average
                                Long Range = 220m, Snap Shot: Formidible (1/4Skill), Aimed Shot: Difficult
                                Extreme Range = 440m, Snap Shot: Impossible (1/10Skill), Aimed Shot: Formidable

                                And finally my Maximum Effective Range...
                                Maximum Effective Range = 880m, Snap Shot: NO, Aimed Shot: Impossible

                                This allows that impressive one in a million shooter WITHOUT compromising the fairly accurate practical accuracy in the RAW game. It also allows for the positive effects of things like optics and bipods with an easy to apply mechanical advantage by simply adding range.

                                Comment

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