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Star Wars Real Engineered: Multiple Troop Transport (Continued) . Tilting propeller multicopter/amphibious tracked personnel carrier hybrid with 10-CH RC: air/land/sea drive, propeller folding/tilting, cargo winch, cargo ramp. Spring driven shooting armament: recoilless gun + portable light MG in retractable turret, 8 RPGs, 2 PDWs. 3 Bionicle/Technic crew, in scale 1:10 . 5.4 Foldable Forklift Figure 78: Foldable Forklift loads a pallet of 100mm recoilless shells into MTT See model in LDD Using almost the same tracked chassis as Bucket Machine, we created a foldable forklift also. Figure 79: Foldable Forklift functions overview See model in LDD Lifting the fork is done with the help of 7 worm gears on ‘Technic axle 16M’. It drives Z8 gear fixed on fork. Fork lifting column can be tilted forward/back or folded with the help of Z8 + worm gear combo placed in the front end of chassis. Figure 80: Foldable Forklift cutaway view See model in LDD Fork can be tilted sideways 45° with the help of Z28 turntable + worm gear combo built in fork slide. This enables forklift to spill some fluid/small particles from a lifted tank/box. Figure 81: Foldable Forklift loaded into MTT See model in LDD Fork rods are removable at folding. Moreover, they can be squeezed 1 studs inward/outward, enabling the Foldable Forklift to grab strong boxes at their sides, without the need of pallet. Of course fork can be used more conveniently with 8×6×1 stud mini pallets. Figure 82: 3 Plane View of Foldable Forklift See folded model in LDD See lifted fork model in LDD See lowered fork model in LDD See tilted fork model in LDD 5.5 Rescue Robot Figure 83: Casualties are loaded into MTT with Rescue Robot See model in LDD The mini tracked chassis can be used to pick up casualties from battlefield adding foldable back panel (with Z8+worm combo) to its front, which serves also as a short ramp to slide on immobilized casualties. Figure 84: Rescue Robot functions overview See model in LDD There are several strongpoints to safely restrain casualty, and there is a foldable IV set. Figure 85: Rescue Robot cutaway view See model in LDD Rescue robot is so compact that it can roll onto the cargo deck of MTT through rear ramp carrying a stretched casualty, besides 2 medical kit boxes, 1 medical attendant/pilot and his PDW. Figure 86: Rescue Robot with casualty loaded into MTT See model in LDD Medical kit boxes are normally carried under the opened driver’s seat. Figure 87: 3 Plane View of Rescue Robot See folded model in LDD See opened model in LDD 5.6 Hoverbike Foldable Tilting Propeller Multicopter Figure 88: Hoverbike escorts MTT in desert patrol See model in LDD There was considerable modeling challenge in „Drone carries Drone” situation. The difficulty is that tilt-rotor fast FPV multicopters (e.g. see Swift280) - which gave inspiration to our design - are not really well-foldable vehicles. Moreover, we wanted to create a drone capable of carrying 1 person and light armament as flying scout bike. Figure 89: Functions overview of Hoverbike See model in LDD Our Hoverbike has 0°..90° foldable-/ and 0°..45° tiltable winglets with 4 LPF2 M-motors at wingtips, driving foldable propellers. Winglets are fixed to 4 ‘Z28 turntable’ parts. Motors are driven by 2 LPF2 SmartHubs placed at the nose and tail of the vehicle. Tilting of winglets is made by manual-driven two-stage worm+Z8 gear mechanism connected to turntables, resulting in gearing ratio 1:224 from tilt roller pedals to winglets. Figure 90: Hoverbike systems overview See model in LDD Armament of Hoverbike consists of: - 2 LM-7C spring driven shooting man-portable light machine guns, auto-loaded from drum magazine for 16 1.5×5mm projectiles made from ‘Z16 running gear’ and ‘Tire 24×7mm’, equipped with 24mm optical sight, gun lamp, and 2×5 8×53mm spring driven shooting cradle grenades with flying spigot type bolt, - 1 spring driven shooting RPG launcher with 16×104mm RPG. As Hoverbike has retractable landing skid instead of wheels, it can be loaded through rear cargo ramp into MTT using its cargo winch. Figure 91: Loading folded Hoverbike into MTT See model in LDD Hoverbike consumes deck space of all 3 crew of MTT, so MTT works as autonomous drone when carrying it. Figure 92: Folded Hoverbike loaded onboard MTT, Cutaway view See model in LDD You can read more detailed description of Hoverbike in our previous MOC. Figure 93: 3 Plane view of Hoverbike in hovering and high speed flight modes See model in LDD 6 Specifications of Multiple Troop Transport Figure 94: Multiple Troop Transport 3 plane view See model in LDD 6.1 Dimensions of Multiple Troop Transport - Width with opened propeller arms: 90.00 studs / 720.00 mm / 28.35 in, Real size: 7.20 m / 23 ft 7.28 in - Height with opened propeller arms, turret, aerials: 30.00 studs / 240.00 mm / 9.45 in, Real size: 2.40 m / 7 ft 10.43 in - Length with opened propeller arms: 82.00 studs / 656.00 mm / 25.83 in, Real size: 6.56 m / 21 ft 6.10 in - Width with tilted propeller arms: 90.00 studs / 720.00 mm / 28.35 in, Real size: 7.20 m / 23 ft 7.28 in - Height with tilted propeller arms: 35.00 studs / 280.00 mm / 11.02 in, Real size: 2.80 m / 9 ft 2.17 in - Length with tilted propeller arms: 74.00 studs / 592.00 mm / 23.31 in, Real size: 5.92 m / 19 ft 4.92 in - Propeller diameter: 35.00 studs / 280.00 mm / 11.02 in, Real size: 2.80 m / 9 ft 2.17 in - Total propeller disc area: 7696.90 sqstuds / 4926.02 sqcm / 763.53 sqinch, Real size: 49.26 sqm / 529.54 sqfeet - Ground clearance of lower propellers: 7.00 studs / 56.00 mm / 2.20 in, Real size: 0.56 m / 1 ft 10.04 in - Propeller arm size: 20.00 studs / 160.00 mm / 6.30 in, Real size: 1.60 m / 5 ft 2.95 in × 3.00 studs / 24.00 mm / 0.94 in, Real size: 0.24 m / 0 ft 9.45 in × 4.00 studs / 32.00 mm / 1.26 in, Real size: 0.32 m / 1 ft 0.59 in - Propeller arm tilting angle: 0°..+45° - Propeller arm folding angle: -90°..+8°, -10°..+90° - Road width: 17.00 studs / 136.00 mm / 5.35 in, Real size: 1.36 m / 4 ft 5.51 in - Road height with retracted turret: 19.00 studs / 152.00 mm / 5.98 in, Real size: 1.52 m / 4 ft 11.81 in - Road height with opened turret: 25.00 studs / 200.00 mm / 7.87 in, Real size: 2.00 m / 6 ft 6.69 in - Road length: 42.50 studs / 340.00 mm / 13.39 in, Real size: 3.40 m / 11 ft 1.77 in - Road freeboard: 3.00 studs / 24.00 mm / 0.94 in, Real size: 0.24 m / 0 ft 9.45 in - Maximal fording depth: 8.00 studs / 64.00 mm / 2.52 in, Real size: 0.64 m / 2 ft 1.18 in - Track links: 4 × 107 ‘Motorcycle chain’ - Maximal trench bridging: 12.00 studs / 96.00 mm / 3.78 in, Real size: 0.96 m / 3 ft 1.77 in - Track footprint area: 96.00 sqstuds / 61.44 sqcm / 9.52 sqinch, Real size: 0.61 sqm / 6.60 sqfeet - Forward ramp angle of tracks: 20° - Rear ramp angle of tracks (without screws): 22° - Hull length: 41.50 studs / 332.00 mm / 13.07 in, Real size: 3.32 m / 10 ft 10.63 in - Hull width: 11.00 studs / 88.00 mm / 3.46 in, Real size: 0.88 m / 2 ft 10.63 in - Minimal draught (screws attached): 4.00 studs / 32.00 mm / 1.26 in, Real size: 0.32 m / 1 ft 0.59 in - Standard displacement: 0.7 metric tons - Screw diameter: 3.00 studs / 24.00 mm / 0.94 in, Real size: 0.24 m / 0 ft 9.45 in - Folded width: 17.00 studs / 136.00 mm / 5.35 in, Real size: 1.36 m / 4 ft 5.51 in - Folded height: 16.00 studs / 128.00 mm / 5.04 in, Real size: 1.28 m / 4 ft 2.36 in - Folded length: 42.50 studs / 340.00 mm / 13.39 in, Real size: 3.40 m / 11 ft 1.77 in - Folded freeboard: 0.10 studs / 0.80 mm / 0.03 in, Real size: 0.01 m / 0 ft 0.31 in - Cargo bay width: 8.00 studs / 64.00 mm / 2.52 in, Real size: 0.64 m / 2 ft 1.18 in - Cargo bay height: 10.00 studs / 80.00 mm / 3.15 in, Real size: 0.80 m / 2 ft 7.48 in - Cargo bay size with human pilot: - Length: 26.00 studs / 208.00 mm / 8.19 in, Real size: 2.08 m / 6 ft 9.84 in - Volume: 2080.00 cubic studs / 1064.96 ccm / 64.99 cubic inch, Real size: 1.06 m3 / 37.61 cubic feet - Cargo bay size in drone mode: - Length: 40.00 studs / 320.00 mm / 12.60 in, Real size: 3.20 m / 10 ft 5.91 in - Volume: 3200.00 cubic studs / 1638.40 ccm / 99.98 cubic inch, Real size: 1.64 m3 / 57.86 cubic feet - Rear ramp size (Extended): 15.00 studs / 120.00 mm / 4.72 in, Real size: 1.20 m / 3 ft 11.22 in × 9.00 studs / 72.00 mm / 2.83 in, Real size: 0.72 m / 2 ft 4.33 in - Rear ramp angle: -15°..+90° - Forward ramp size: 6.00 studs / 48.00 mm / 1.89 in, Real size: 0.48 m / 1 ft 6.89 in × 9.00 studs / 72.00 mm / 2.83 in, Real size: 0.72 m / 2 ft 4.33 in - Forward ramp angle: -10°..+82° - Instrument panel hatch size: 12.50 studs / 100.00 mm / 3.94 in, Real size: 1.00 m / 3 ft 3.35 in × 8.00 studs / 64.00 mm / 2.52 in, Real size: 0.64 m / 2 ft 1.18 in - Instrument panel hatch angle: -33°..+90° - Top hatch size: 11.00 studs / 88.00 mm / 3.46 in, Real size: 0.88 m / 2 ft 10.63 in × 9.00 studs / 72.00 mm / 2.83 in, Real size: 0.72 m / 2 ft 4.33 in - Top hatch angle: 0°..+90° - Bottom hatch size: 5.00 studs / 40.00 mm / 1.57 in, Real size: 0.40 m / 1 ft 3.74 in × 9.00 studs / 72.00 mm / 2.83 in, Real size: 0.72 m / 2 ft 4.33 in - Bottom hatch angle: 0°..+80° - Detachable gun turret baseplate size: 9.00 studs / 72.00 mm / 2.83 in, Real size: 0.72 m / 2 ft 4.33 in × 9.00 studs / 72.00 mm / 2.83 in, Real size: 0.72 m / 2 ft 4.33 in - Gun turret baseplate angle: -180°..0° - Gun turret length: 20.00 studs / 160.00 mm / 6.30 in, Real size: 1.60 m / 5 ft 2.95 in - Gun turret width: 8.00 studs / 64.00 mm / 2.52 in, Real size: 0.64 m / 2 ft 1.18 in - Gun turret height: 5.00 studs / 40.00 mm / 1.57 in, Real size: 0.40 m / 1 ft 3.74 in .. 6.00 studs / 48.00 mm / 1.89 in, Real size: 0.48 m / 1 ft 6.89 in - Gun turret azimuth angle: -180°..+180° - Gun turret elevation angle: -10°..+37° Figure 95: Multiple Troop Transport cutaway view (animated) See model in LDD 6.2 Gearing ratios of Multiple Troop Transport - 4 LPF L-motors: 8 propellers = 1:1, 1:-1 - 4 LPF L-motors: 4 propeller arm tilt = 1:1 - 2 LPF2 M-motors: 4 propeller arm folding = 8:1, 8:-1 - 2 LPF2 M-motors: 2 track driving sprockets = 8:1 - 2 LPF2 M-motors: 2 screws = 3:5 - 1 LPF2 M-motor: 1 rear ramp = 8:1 - 1 LPF2 M-motor: 1 winch = 1:1 Figure 96: Multiple Troop Transport cutaway view See model in LDD 6.3 RC Channel layout of Multiple Troop Transport - CH 1-2: LPF2 SmartHub5: 2 LPF2 M-motors for left + right track driving sprockets/ screws - CH 3-4: LPF2 SmartHub2: 2 LPF L-motors for propellers 1, 2 + 3, 4 - CH 5-6: LPF2 SmartHub4: 2 LPF L-motors for propellers 5, 6 + 7, 8 - CH 7-8: LPF2 SmartHub1: 2 LPF2 M-motors parallel for propeller arm folding + 1 LPF2 M-motor for winch/ rear ramp(manually clutched) - CH 9-10: LPF2 SmartHub3 (optional): 4 LPF L-motors parallel for propeller arm tilting + 1 reserve channel for carried weapons Figure 97: Multiple Troop Transport folded dimensions See model in LDD 7 Unsolved issues of Multiple Troop Transport 7.1 Engineering design flaws of the concept - Current level of LiPo battery technology has not enough energy density to drive MTT: steering and stabilization of multicopters requires continuous acceleration/deceleration of fixed pitch propellers. Therefore, energy consumption highly depends on propeller torque, which increases dramatically with size: the same propeller profile, from the same material, at the same RPM in doubled size results in 4 times more propeller disc area (and roughly 4 times more lifting force), but as its mass increases 8 times, and speed 2 times (but it effects torque on the second power), torque (and energy consumption) will increase 8×2×2=32 times. We tried to use the sleekest possible propellers, but the problem of size is still there. - Hybrid drive with turboshaft-driven alternators is powerful but too heavy: 2 type of fuel storage, 2 type of engines, 2 type of control and safety systems, etc. - Lower propellers have limited ground clearance, so they are vulnerable landing at crosswind or uneven terrain - MTT can carry only a very-very light armor for splinter protection, which is ridiculous compared to armor protection of any serious AFVs. But there is a strong temptation to use it against AFVs in land combat, where its advanced mobility does not matter, and vulnerability will be exploited by enemy. - Airframe/hull together with tracks, propeller arms and gun turret have very high drag. 7.2 Lego modeling design flaws - We did not design space for the tremendous amount of wiring required by 10CH control in TLG PF. LDD cannot draw wires, and they are disproportionally uncompact compared to real wiring. - Torque tolerance of slim propellers are minimal. - Tiltable part of propeller arms would most probably break off very quickly because of vibration. Lego bricks and connections are just very weak, where carbon-reinforced and titanium parts are needed in real engineering. - Spring struts of suspension could not hold the tremendous weight of 5 LPF2 SmartHubs and 13!!!! LPF electric motors. (Of course real electric motors and servos are proportionally more light). - Watertight lower hull is not watertight at all from system bricks. 8 References In the dropship-related scenes our previous Sikorsky S-129 dropship MOC was used: Figure 98: SkyTank functions overview Figure 99: SkyTank cutaway view In the rescue scenes, our earlier Standard Girl Model 2 MOC was used: Figure 100: Pauler’s Standard Girl Model 2.0 versions


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