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Star Wars Real Engineered: Multiple Troop Transport (Continued)
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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
About this creation
5.4 Foldable Forklift

Foldable Forklift loads a pallet of 100mm recoilless shells into MTT
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.

Foldable Forklift functions overview
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.

Foldable Forklift cutaway view
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.

Foldable Forklift loaded into MTT
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.

3 Plane View of Foldable Forklift
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

Casualties are loaded into MTT with 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.

Rescue Robot functions overview
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.

Rescue Robot cutaway view
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.

Rescue Robot with casualty loaded into MTT
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.

3 Plane View of Rescue Robot
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

Hoverbike escorts MTT in desert patrol
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.

Functions overview of Hoverbike
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.

Hoverbike systems overview
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.

Loading folded Hoverbike into MTT
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.

Folded Hoverbike loaded onboard MTT, Cutaway view
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.

3 Plane view of Hoverbike in hovering and high speed flight modes
Figure 93: 3 Plane view of Hoverbike in hovering and high speed flight modes
See model in LDD

6 Specifications of Multiple Troop Transport

Multiple Troop Transport 3 plane view
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°

Multiple Troop Transport cutaway view (animated)
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

Multiple Troop Transport cutaway view
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

Multiple Troop Transport folded dimensions
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:

SkyTank functions overview
Figure 98: SkyTank functions overview

SkyTank cutaway view
Figure 99: SkyTank cutaway view

In the rescue scenes, our earlier Standard Girl Model 2 MOC was used:

Pauler’s Standard Girl Model 2.0 versions
Figure 100: Pauler’s Standard Girl Model 2.0 versions


Building instructions
Download building instructions (LEGO Digital Designer)

Comments

 I made it 
  May 17, 2018
Quoting Nick Barrett Genius within genius.... incredible.
Thanks.
 I like it 
  May 17, 2018
Genius within genius.... incredible.
 I made it 
  May 16, 2018
Quoting Owen the Omniscient of Lithowenia Good grief. This thing is an engineering marvel; it's only restricted(as expounded in your description) by its building material. Congratulations on yet a another amazing creation.
Thanks. It would be restricted by strength of current material in the reality also. All major parts should be carbon-fibre reinforced, propeller arm jacks from forged titanium, just to get off the ground. It would be more expensive, than a main battle tank. I computed that in the reality its propeller disc loading at hovering even at most optimistic estimation is 14 KG / square meters, while at current military helicopters it usually cannot exceed 10 KG / square meters.
 I like it 
  May 16, 2018
Good grief. This thing is an engineering marvel; it's only restricted(as expounded in your description) by its building material. Congratulations on yet a another amazing creation.
 I made it 
  May 16, 2018
Quoting Zach Sweigart Incredibly complex! To the point that the wireframe schematics don't even look like Lego! Well done!
This is the consequense of the "technic lever frames + technic axle longerons" aiframe building technique I am using. From real bricks it would be pretty hard and time consuming to build, but it allows more compact mechanics and fairings than the "official" TLG technic building style with longitudial technic beams and technic cross axles. Making wireframe is done by setting all bricks of the LDD model transparent, make a screenshot, and apply "edge detect" filter in photoshop.
 I like it 
  May 16, 2018
Incredibly complex! To the point that the wireframe schematics don't even look like Lego! Well done!
 I made it 
  May 15, 2018
Quoting Tom's MOCs "Excellent" as a rating does not begin to do justice to it. The amount of thinking and work to create all the intricacies embedded in this model and its display is nothing short of mind-boggling. For most of us out here, if we had an entire team of engineers at our disposal for months, we could not produce something so detailed!
Thanks.
 I like it 
  May 15, 2018
"Excellent" as a rating does not begin to do justice to it. The amount of thinking and work to create all the intricacies embedded in this model and its display is nothing short of mind-boggling. For most of us out here, if we had an entire team of engineers at our disposal for months, we could not produce something so detailed!
 
By Gabor Pauler
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