Date: Tue, 10 Jun 1997 21:20:39 -0400 From: John DeHope GURPS Mecha MAC II Design --------------- PART I: CONCEPT This is going to be the MAC II from the Robotech series. It is a really huge artillery piece with uncanny firepower. Its target weight is 200,000 pounds, or 100 tons. This is early TL 9 technology. Note that the armour on this mecha is more realistic than was portrayed in the Palladium Robotech game. Artillery units never have as much armour as main-line combat vehicles. ----------------------------- PART II: BODY & SUBASSEMBLIES STEP 1: CHOOSE SUBASSEMBLIES Two legs. Two striker arms. No turret. STEP 2: STREAMLINED MECHA This mecha is not streamlined. -------------------- PART III: COMPONENTS STEP 3: DRIVETRAIN A 650 kW drivetrain is housed in the legs. 650 kW Drivetrain. Weight 2,780 pounds (2.8 tons). Volume 27.8 cf each leg. Cost $556,000. STEP 4: ARM MOTORS The arms have 500 strength each. They are also cheap. Two 500 Str cheap arm motors. Weight 150 pounds each. Volume 4 cf each. Cost $200,000 each. Power 2.5 kW each. STEP 5: THRUSTERS Very light thrusters are included as a safety precaution during space maneuvers. Thrust is only 10% of the target mass (10 tons, 20,000 pounds). The most economical thruster is a low-tech chemical rocket. One 20,000 pound thrust chemical rocket thruster (TL 8). Weight 450 pounds. Volume 9 cf in body. Cost $11,250. Fuel 22,000 gph rocket fuel (6.11 gps). STEP 6: COCKPIT Two cockpits with ejection seats. Room for two more passengers. 48 extra man-hours of air. Two cockpits each with ejection seat, extra passenger, and 24 hours extra air. Weight 980 pounds each. Volume 54.4 cf each. Cost $180,700 each. Power 1 kW each. STEP 7: BUILT-IN WEAPONS Each arm houses 3 light rainbow lasers. The body supports 4 huge 200mm gauss cannons. Each cannon has ammunition for 20 firings. Six light rainbow lasers. Weight 230 pounds each. Volume 4.6 cf each. Cost $28,000 each. Power 64,800 kW each. Four 200mm gauss cannons. Weight 24,000 pounds each. Volume 480 cf each. Cost $4,800,000 each. Power 180,000 kW each. 80 shots of 200mm gauss cannon ammo. Weight 16,000 pounds. Volume 160 cf. Cost $960,000. STEP 8: WEAPON ACCESSORIES Each arm's lasers are linked. The four guns are linked. The cannon ammo is in an anti-blast magazine. Three weapon links. Cost $150. 480 cf of anti-blast magazine capacity. Weight 12,000 pounds. Cost $120,000. STEP 9: SENSORS Two 100 mile PESA (one foreward and one back) and one 100 mile AESA sensor systems are included. They are in the body. The PESAs give 360 degree coverage for maneuvering. The AESA is fixed foreward and is used primarily for target acquisition. Two 100 mile PESAs. Weight 200 pounds each. Volume 8 cf each. Cost $800,000 each. 100 mile AESA. Weight 150 pounds. Volume 3 cf. Cost $250,000. Power 50 kW. STEP 10: COMSUITES A basic comsuite is included. It is in the body. Basic comsuite. Weight 12.5 pounds. Volume .25 cf. Cost $3,425. Power .1 kW. STEP 11: ELECTRONIC COUNTERMEASURES No countermeasures are included. STEP 12: POWER SYSTEMS A 707.1 kW powerplant is necessary, so a 1000 kW one is installed to recharge the lasers. To save weight a fission reactor is used. The reactor is in the body. Each arm contains a 5,832,000 kWs rechargeable power cell to allow the lasers to fire for 30 seconds each. 1000 kW fision reactor. Weight 2,000 pounds. Volume 40 cf. Cost $40,000. Fission fuel. Cost $40,000. Two 8,832,000 kWs rechargeable power cells. Weight 654 pounds each. Volume 65 cf each. Cost $65,400 each. STEP 13: FUEL AND FUEL TANKS 300 gallons of rocket fuel are kept for emergency space maneuvers. The tank is in the body. This provides 49 seconds of thrust. 300 gallon standard fuel tank. Weight 150 pounds. Volume 45 cf. Cost $1,500. Fire -2. 300 gallons rocket fuel. Weight 3000 pounds. Cost $600. Fire 13. STEP 14: CARGO SPACE 10 cubic feet of cargo space is in the body for whatever needs might pop up. 50 pounds per cf of space is assumed for weight. 10 cf cargo space. Weight 500 pounds. Volume 10 cf. STEP 15: ACCESS SPACE The drivetrain, fission reactor, and chemical rocket require access space. Leg access space. Volume 27.8 cf each. Body access space. Colume 49 cf. --------------------------- PART IV: VOLUME & STRUCTURE STEP 16: BODY & SUBASSEMBLY VOLUMES Each arm houses: 3 lasers, 1 power cell, 1 arm motor, extra volume to toughen (217.2 cf). Each leg houses: 1 part of the drivetrain, extra volume to support body (672.2 cf). The body houses: thruster, cockpit, 4 cannons, ammo magazine, sensors, comsuite, reactor, fuel tank, and cargo space. Two arms. Volume 300 cf. Two legs. Volume 700 cf. Body. Volume 2312.05 cf. Total. Volume 4312.05 STEP 17: SURFACE AREA Two arms. Surface area 300 sf. Two legs. Surface area 500 sf. Body. Surface area 1200 sf. Total surface are 2800 sf. STEP 18: STRUCTURE A standard medium-strength structure is used. Structure. Weight 12,936 pounds. STEP 19: HIT POINTS Two arms. Hit points 900 hp each. Two legs. Hit Points 750 hp each. Body. 1800 hp. ------------------------ PART V: SURFACE FEATURES STEP 20: ENVIRONMENTAL PROTECTION The mecha is sealed. Sealed. Cost $28,000. STEP 21: DEFENSIVE SURFACE FEATURES The mecha has none. STEP 22: ARMOUR Total weight so far is 154106.5 pounds (77.05 tons). The rest of the mech's weight is available for armour, so it will carry 45893.5 pounds of armour (22.95 tons). The body receives 60%, each leg receives 13%, and each arm receives 7%. This gives the foll owing weights of armour. Two arms. Armour weight 3213 pounds each. Two legs. Armour weight 5967 pounds each. Body. Armour weight 27536 pounds. All armour is laminate. Each point of DR weighs the following amount. Two arms. Weight per DR 18 pounds. Two legs. Weight per DR 42 pounds. Body. Weight per DR 72 pounds. The DR for each location is as follows. All locations are PD 4. Two arms. DR 179. Two legs. DR 142. Body. DR 382. STEP 23: HARDPOINTS The mecha has none. ------------------- PART VI: STATISTICS Total mass is exactly 100 tons (200,000 pounds). Size modifiers are as follows. Arm size modifier +3. Leg size modifier +4. Body size modifier +5. Total size modifier +6. Height is approximately 22 yards tall, 7 yards long, and 7 yards wide. Body strength is 3600. Arm strength is 500. Arm reach is 17 yards. Thrust damage is 51d. Swing damage is 53d. --------------------- PART VII: PERFORMANCE Top ground speed is 20 mph. gMR is 1.5. gSR is 2. Ground Move is 10. The mecha is jump-capable. It has a sAccel of 0.1g. sMR is also .1. The mecha can accelerate 1 yard per second in space.