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The Mercedes-Benz Flying Car: Engineering data
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Air drivetrain: 4 3-blade foldable propellers, driven by 4 L-Motors via RC of 2 SmartHubs, 4 foldable/Tiltable propeller arms driven by 2 M-Motors + 4 L-Motors via RC of 2 SmartHubs. Land drivetrain: RWD, 2-speed manual gear shift, rack & pinion power steering, front disc brake driven by 1 XL-Motor and 2 Servo motors via RC of 2 SmartHubs. Crew: 4 Bionicle/Technic figures, in scale 1:10.
About this creation
This is appendix of "The Mercedes-Benz Flying Car" MOCPages post

See this post also at Flickr

5 Specifications of Mercedes-Benz 1200FL

5.1 Performance data of Mercedes-Benz 1200FL

Maximal Takeoff weight (MTOW) = 2730KG = 6026.5Lbs
Total fuel capacity: 393L = 86.45Imp gal
Top land speed: 160KM/h = 100MPH
Top air speed: 200KM/h = 125MPH
Air duration: 61min
Air on battery duration: 60sec
Air range: 200KM = 125 Miles
Land range: 1965KM = 1228 Miles
Land on battery duration: ca. 20min (at 90KM/h = 56.25MPH)
Land on battery range: 33KM = 20.62 Miles
Air mileage: 196.5L/100KM = 1.2MPG
Land mileage 20L/100KM = 11.76MPG

5.2 Dimensions of Mercedes-Benz 1200FL

Road length: 73.00 studs / 584.00 mm / 22.99 in, Real size: 5.84 m / 19 ft 1.77 in
Road width: 26.00 studs / 208.00 mm / 8.19 in, Real size: 2.08 m / 6 ft 9.84 in
Road height: 18.00 studs / 144.00 mm / 5.67 in, Real size: 1.44 m / 4 ft 8.66 in
Open gullwing door height: 24.00 studs / 192.00 mm / 7.56 in, Real size: 1.92 m / 6 ft 3.54 in
Open canopy height: 28.00 studs / 224.00 mm / 8.82 in, Real size: 2.24 m / 7 ft 4.13 in
Ground clearance: 3.00 studs / 24.00 mm / 0.94 in, Real size: 0.24 m / 0 ft 9.45 in
Wheelbase: 44.00 studs / 352.00 mm / 13.86 in, Real size: 3.52 m / 11 ft 6.50 in
Front track width: 22.00 studs / 176.00 mm / 6.93 in, Real size: 1.76 m / 5 ft 9.25 in
Rear track width: 20.00 studs / 160.00 mm / 6.30 in, Real size: 1.60 m / 5 ft 2.95 in
Tire size: 7.00 studs / 56.00 mm / 2.20 in, Real size: 280/65R17
Land turning radius: 88.00 studs / 704.00 mm / 27.72 in, Real size: 7.04 m / 23 ft 0.98 in
Hover length: 107.00 studs / 856.00 mm / 33.70 in, Real size: 8.56 m / 28 ft 0.79 in
Hover width: 115.00 studs / 920.00 mm / 36.22 in, Real size: 9.20 m / 30 ft 1.97 in
Hover height: 18.00 studs / 144.00 mm / 5.67 in, Real size: 1.44 m / 4 ft 8.66 in
Propeller ground clearance: 14.00 studs / 112.00 mm / 4.41 in, Real size: 1.12 m / 3 ft 8.07 in
Propeller diameter: 44.00 studs / 352.00 mm / 13.86 in, Real size: 3.52 m / 11 ft 6.50 in
Total propeller disc area: 6082.12 sqstuds / 3892.56 sqcm / 603.35 sqinch, Real size: 38.93 sqm / 418.44 sqfeet
Level flight length: 97.50 studs / 780.00 mm / 30.71 in, Real size: 7.80 m / 25 ft 6.89 in
Level flight width: 115.00 studs / 920.00 mm / 36.22 in, Real size: 9.20 m / 30 ft 1.97 in
Level flight height: 28.00 studs / 224.00 mm / 8.82 in, Real size: 2.24 m / 7 ft 4.13 in
Air turning radius: 62.50 studs / 500.00 mm / 19.69 in, Real size: 5.00 m / 16 ft 4.72 in

Mercedes-Benz 1200FL road mode 3 plane view
Figure 63: Mercedes-Benz 1200FL road mode 3 plane view
See model in LDD

Mercedes-Benz 1200FL flight mode 3 plane view
Figure 64: Mercedes-Benz 1200FL flight mode 3 plane view
See hovering model in LDD
See level flight model in LDD

5.3 Weight estimation of components of Mercedes-Benz 1200FL

4 × Persons = 320 KG
12× 172cm carbon propeller blades = 60 KG
4 × 300LE Yasa electric motor for air drive = 360 KG
1 × 200LE Yasa electric motor for land drive = 66 KG
6 x JP-1 Jet fuel tank 65.5L × 775g/L = 305 KG
1 × DB1200 1563SHP turboshaft 0.208KG/HP/HR = 145 KG
4 × Jet exhaust pipes & heat exchanger = 40 KG
1 × 1200kVA Siemens generator = 78 KG
1 × 1200KW inverter + liquid cooling = 50 KG
1 × 1200KW converter + liquid cooling = 50 KG
2 × 380V 1300A 21Ah Zinc-Silveroxide batteries = 130 KG
1 × 12V 100A 60Ah Lead-Acid battery = 10 KG
1 × 380V/ 12V DC/DC converter = 5 KG
2 × 380V Battery dischargers = 5 KG
2 × 380V Battery Monitor & Equalizer = 5 KG
4 × 380V Line breakers & junction box = 8 KG
2 × 380V Battery disconnectors = 2 KG
1 × A/C + generator cooling compressor = 10 KG
4 × Propeller arms with tilting servo = 200 KG
2 × Propeller folding servo = 20 KG
2 × Propeller arm cover servo = 20 KG
1 × Steering servo = 15 KG
1 × Front disc brake servo = 15 KG
5 × 280/65R17 tire with carbon rims = 75 KG
1 × 2-speed manual gearbox with differential = 45 KG
1 × Front suspension & disc brakes = 80 KG
1 × Rear suspension = 70 KG
1 × Dashboard & instruments = 25 KG
2 × Front seats & belts = 30 KG
1 × Rear seat & 2 belts = 15 KG
1 × Ballistic Parachute = 41 KG
1 × Lifter + medkit + toolset + lamp = 20 KG
2 × Cockpit canopy, polycarbonate = 42 KG
2 × Gullwing doors, polycarbonate = 14 KG
2 × Doorsteps, glass fibre + resin = 24 KG
1 × Hood cover, glass fibre + resin = 10 KG
1 × Windscreen wipers = 2 KG
1 × Bonnet cover, glass fibre + resin = 8 KG
4 × Propeller blade locks = 8 KG
4 × Propeller cover plates, glass fibre + resin = 24 KG
4 × Propeller arm doors, glass fibre + resin = 12 KG
4 × Mud guard plates, glass fibre + resin = 24 KG
2 × Lower mud guard plates, glass fibre + resin = 16 KG
4 × Floor plates, glass fibre + resin = 32 KG
1 × Roof plate, glass fibre + resin = 4 KG
1 × Front mask panel, glass fibre + LED light = 30 KG
1 × Rear mask panel, glass fibre + LED lights = 30 KG
1 × Light alloy space frame = 130 KG
Total MTOW =2730KG

5.4 Gearing ratios of Mercedes-Benz 1200FL

- 4 LPF L-motors: 4 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
- 1 PF XL-motor: rear wheels = 1:1 (High), 2:3 (Low), Neutral

5.5 RC Channel layout of Mercedes-Benz 1200FL

- SmartHub1 CH1: Forward propeller arms folding, 1 LPF2 M-Motor
- SmartHub1 CH2: Rear propeller arms folding, 1 LPF2 M-Motor
- SmartHub2 CH1: Left forward propeller, 1 PF L-Motor
- SmartHub2 CH2: Left rear propeller, 1 PF L-Motor
- SmartHub3 CH1: Right forward propeller, 1 PF L-Motor
- SmartHub3 CH2: Right rear propeller, 1 PF L-Motor
- SmartHub4 CH1: Forward propeller arms tilting, 2 PF L-Motors
- SmartHub4 CH2: Rear propeller arms tilting, 2 PF L-Motors
- SmartHub5 CH1: Rack & pinion power steering, 1 PF Servo Motor
- SmartHub5 CH2: RWD PF XL-Motor, Turboshaft starter PF XL-Motor
- SmartHub6 CH1: Front disc brake, 1 PF Servo Motor
- SmartHub6 CH2: Propeller arms cover plates, 1 LPF2 M-Motor

6 Unsolved issues of Mercedes-Benz 1200FL

6.1 Engineering design flaws of the concept

1. Lego Technic modeling was enough realistic to show that time of practically useable, roadable VTOL flying cars has not yet to come: Either there is large rotor disc area with reasonable hover efficiency and moderate energy consumption, but folded large size rotor will undermine practical road handling. Or, there is relatively small rotor disc area, well foldable into a conventional body of full size car, providing good road handling. But it will result in low hover efficiency and such a high energy consumption, that even the most powerful, turbo generator-based hybrid systems currently available have not enough energy density for that. It has two reasons:
- Steering and stabilization of multicopters requires continuous acceleration/deceleration of fixed pitch propellers. Therefore, its 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 of steering & stabilization) will increase 8×2×2=32 times.
- Hybrid drive with turbo generator is powerful but too heavy: 2 types of fuel storage, 2 types of engines, 2 types of control and safety systems, etc. We collected what is left out from the most optimistic weight estimation:
1 × Baggage = 20 KG
4 × Electric motors missing part = 40 KG
1 × Space frame missing weight = 70 KG
6 × Fuel tanks = 120 KG
1 × Fuel lines = 15 KG
4 × Electric wiring = 300 KG
2 × Battery coolant lines = 10 KG
6 × Internal paneling = 30 KG
2 × Floor side panels = 16 KG
1 × Front lower panel = 8 KG
1 × Rear lower panel = 16 KG
1 × Coffee machine = 8 KG
1 × Video conferencing system = 15 KG
2 × Headrest displays = 2 KG
Total overweight over 2730KG MTOW = 670 KG
2. There is no any lift redundancy and possibility for dead engine crash landing. Emergency landing is solely based on ballistic parachute, which is applicable only above 40m/133ft altitude and under 100KMPH/62.5MPH speed. So, there is considerable “Dead man’s zone” during takeoff and landing. It makes questionable whether FAA would ever certify such a vehicle.
3. Propellers have smaller ground clearance than at a helicopter, so they are vulnerable at landing in crosswind or in uneven terrain

6.2 Lego modeling design flaws

1. All wirings are omitted from the model, which would consume considerable additional space.
2. Rear suspension is too weak to support the weight of 13 PF electric motors and 6 SmartHubs.
3. Bonnet has no lock.
4. Rear canopy can be opened only when gullwing doors are open 45° upward.
5. No centering mechanism of steering.

7 Farewell to MOCPages

This is my last post on MOCPages – at least until very basic reforms will happen in the management of the site:
- Too much childish garbage,
- Too much server outages,
- Too much of Sean’s negligence.
We had a great time together, guys, and I hope that we will meet again at Flickr, Bricklink or wherever we find correctly managed home for our community.

8 References

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

Pauler’s Standard Girl Model 2.0 versions
Figure 65: Pauler’s Standard Girl Model 2.0 versions

In escort scenes, our earlier Hoverbike MOC was used:

Functions overview of Hoverbike
Figure 66: Functions overview of Hoverbike
See model in LDD


Building instructions
Download building instructions (LEGO Digital Designer)


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By Gabor Pauler
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Added August 10, 2018
 


LEGO models my own creation MOCpages toys shop The Mercedes-Benz Flying Car: Engineering dataTechnic


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