Hi everyone. I'd like to introduce to you my latest MOC: Technic RC Pneumatic Dump Truck. It is on 1:17 scale, weighing in at 4.32kg with just over 5,000 parts. It is loosely inspired by the SinoTruk Howo 8 x 4 Tipper Twin Steer. I would love to get your thoughts & feedback!
More pictures on Flickr HERE
Instructions: BuWizz, 2.4GHz
Feature Summary
video
Comparison Pictures
Locomotion
All motorized functions are powered by dual BuWizz 2.0 or 2.4GHz Units integrated into the Cab. The model features RC Drive, with a full 8 x 8 train. Propulsion is delivered by 4 x PF XL Motors, geared down at 2 to 1 with the help of Planetary Hubs. There are no center differentials, which ensures that all 4 axles are driven full-time. The drive train is also connected to a (cosmetic) inline 6-cylinder engine, complete with a fan. With an empty bed, the weight distribution is closer to the front, which limits the traction on the rear wheels. In practice, the 8 x 8 drive configuration results in much better outdoor & overall performance (particularly over uneven terrain). Individual axle-mounted PF Servo Motors steer the Truck through a Rack & Pinion system, & this is independent of Suspension flex. Axle 1 (forward) has a tighter turning radius than Axle 2. There is a mechanical linkage connecting the system to the Steering Wheel in the Driver Cab with a +/- 167 deg range for a more realistic look. This function remains operational even when the Cab is tipped.
Suspension
All 4 Axles feature Live Suspension. Both the front & rear wheel sets are connected in tandem, similar to a walking beam configuration. By combining traverse & longitudinal pendulum levers, articulation is achieved without the use of shock absorbers. This also offers maximum roll stability for high center-of-gravity applications. This idea was inspired by the All Terrain Crane by Jennifer Clark.
Pneumatic System
The Pneumatic Circuit uses compressed air to control the pistons that operate the Bed & Driver Cab tipping functions. A compressor generates pressurized air that is then redirected towards the pistons through corresponding switches. At the heart of the pneumatic system is the air compressor. It is driven by a PF L Motor using 2 Pumps aligned out of phase for smooth flow. Compressed Air is fed to the Pneumatic Switches that control the tipping functions. The model features 2 Pneumatic functions: Tip Driver Cab & Tip Dump Bed. The air supply from the Compressor is redirected through Pneumatic Switches, which in turn control the Pneumatic Pistons that operate the functions. The switches are activated by PF Servo Motors. With the Compressor turned on to supply airflow, the Servo angle (-90, 0, 90) corresponds to the Switch positions (-1, 0, 1), which then moves the Pneumatic Pistons as (retract, neutral, extend). Full credit to @Functional Technic
for the original RC Pneumatic Servo set-up. The Dump Bed tips at up to 45 deg & has a lifting capacity of 2.5 kg, with a total volume of 3,623 cubic cm.
Gate Lock
The Dump Bed contains a gravity-based Lever that automatically releases the Gate as soon as tipping begins. Conversely, it is timed to lock the gate once the bed is horizontal. An optional pin is included that secures the Lever in position so that it doesn't release the Gate upon tipping.
Driver Cab Details
The Driver Cab features functional doors with a spring-loaded mechanical linkage to open & lock them. This mechanism fits in a single stud width & once locked, the door is fully constrained to the Cab. The driver side contains Foot Pedals (Brake & Accelerator), Air Horn, Signals, Ignition Key, Gear Shift Lever. The Windshield Wipers, Mirrors & Sun Visors are all independently adjustable. The Hood on the front opens to reveal a working Engine Fan. Finally, Technic Figure compatibility has been maintained using vintage seats. Admittedly the Technician scale isn't 100% accurate, but it is never a bad idea to include them.
Locking Elements
Both the Driver Cab & Dump Bed feature locking mechanisms that reinforce the tipping functions. This is ideal for model transport, where it can be easily lifted from above any of the sections. Typically, it would be carried from beneath or by holding the front & back.
Aftermarket Tires
While the standard 62.4 x 20 tires work well, but the RC4WD 1.2” variants have always been preferrable. They are a bit larger & have a more rugged look overall. Due to the weight of the model, the supplied foam inserts were not sufficient for the tires to retain their shape. To overcome this, custom inserts were designed & 3D Printed for the Dirt Grabber option. They consist of symmetrical halves that are joined together on the rim & secured with Technic ½ Pins. The ID features inner shoulders that prevent lateral movement relative to the rim.
More Pictures
More pictures on Flickr HERE
Instructions: BuWizz, 2.4GHz
Feature Summary
- Powered by 2 x BuWizz 2.0 or 2.4GHz Box.
- RC Drive 8 x 8. RC Twin Steering.
- Springless Live Axle Suspension Front & Rear with maximum roll stability.
- RC Compressor.
- RC Pneumatic Functions. Tip Dump Bed & Driver Cab independently.
- Dump Bed Automatic Gate Lock with optional Manual Override.
- Opening Doors with Spring Loaded Latch.
- Foot Pedals (Brake & Accelerator), Signal Levers, Gear Shifter, Air Horn Chain, Ignition Key, opening Glove Compartment.
- Working In-Line 6 Cylinder Engine (Connected to Drive Shaft)
- Working steering wheel full time, even when cab is tipped.
- Opening Hood, revealing Engine Fan.
- Adjustable sun visors, mirrors, windshield wipers.
- Technic Figure Compatibility.
- Locking Feature to secure Dump Bed & Driver Cab to Frame to add rigidity & facilitate ease of model transport.
video
Comparison Pictures
Locomotion
All motorized functions are powered by dual BuWizz 2.0 or 2.4GHz Units integrated into the Cab. The model features RC Drive, with a full 8 x 8 train. Propulsion is delivered by 4 x PF XL Motors, geared down at 2 to 1 with the help of Planetary Hubs. There are no center differentials, which ensures that all 4 axles are driven full-time. The drive train is also connected to a (cosmetic) inline 6-cylinder engine, complete with a fan. With an empty bed, the weight distribution is closer to the front, which limits the traction on the rear wheels. In practice, the 8 x 8 drive configuration results in much better outdoor & overall performance (particularly over uneven terrain). Individual axle-mounted PF Servo Motors steer the Truck through a Rack & Pinion system, & this is independent of Suspension flex. Axle 1 (forward) has a tighter turning radius than Axle 2. There is a mechanical linkage connecting the system to the Steering Wheel in the Driver Cab with a +/- 167 deg range for a more realistic look. This function remains operational even when the Cab is tipped.
Suspension
All 4 Axles feature Live Suspension. Both the front & rear wheel sets are connected in tandem, similar to a walking beam configuration. By combining traverse & longitudinal pendulum levers, articulation is achieved without the use of shock absorbers. This also offers maximum roll stability for high center-of-gravity applications. This idea was inspired by the All Terrain Crane by Jennifer Clark.
Pneumatic System
The Pneumatic Circuit uses compressed air to control the pistons that operate the Bed & Driver Cab tipping functions. A compressor generates pressurized air that is then redirected towards the pistons through corresponding switches. At the heart of the pneumatic system is the air compressor. It is driven by a PF L Motor using 2 Pumps aligned out of phase for smooth flow. Compressed Air is fed to the Pneumatic Switches that control the tipping functions. The model features 2 Pneumatic functions: Tip Driver Cab & Tip Dump Bed. The air supply from the Compressor is redirected through Pneumatic Switches, which in turn control the Pneumatic Pistons that operate the functions. The switches are activated by PF Servo Motors. With the Compressor turned on to supply airflow, the Servo angle (-90, 0, 90) corresponds to the Switch positions (-1, 0, 1), which then moves the Pneumatic Pistons as (retract, neutral, extend). Full credit to @Functional Technic
for the original RC Pneumatic Servo set-up. The Dump Bed tips at up to 45 deg & has a lifting capacity of 2.5 kg, with a total volume of 3,623 cubic cm.
Gate Lock
The Dump Bed contains a gravity-based Lever that automatically releases the Gate as soon as tipping begins. Conversely, it is timed to lock the gate once the bed is horizontal. An optional pin is included that secures the Lever in position so that it doesn't release the Gate upon tipping.
Driver Cab Details
The Driver Cab features functional doors with a spring-loaded mechanical linkage to open & lock them. This mechanism fits in a single stud width & once locked, the door is fully constrained to the Cab. The driver side contains Foot Pedals (Brake & Accelerator), Air Horn, Signals, Ignition Key, Gear Shift Lever. The Windshield Wipers, Mirrors & Sun Visors are all independently adjustable. The Hood on the front opens to reveal a working Engine Fan. Finally, Technic Figure compatibility has been maintained using vintage seats. Admittedly the Technician scale isn't 100% accurate, but it is never a bad idea to include them.
Locking Elements
Both the Driver Cab & Dump Bed feature locking mechanisms that reinforce the tipping functions. This is ideal for model transport, where it can be easily lifted from above any of the sections. Typically, it would be carried from beneath or by holding the front & back.
Aftermarket Tires
While the standard 62.4 x 20 tires work well, but the RC4WD 1.2” variants have always been preferrable. They are a bit larger & have a more rugged look overall. Due to the weight of the model, the supplied foam inserts were not sufficient for the tires to retain their shape. To overcome this, custom inserts were designed & 3D Printed for the Dirt Grabber option. They consist of symmetrical halves that are joined together on the rim & secured with Technic ½ Pins. The ID features inner shoulders that prevent lateral movement relative to the rim.
More Pictures
Anhänge
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