Gosainthan, Competition RC Rock Crawler (Super Class) OpenRC by GonzaloChomon

Last crawled date: 3 years ago

THIS PROJECT IS STILL ON PROGRESS, WILL BE UPDATED PERIODICALLY.
This is the design of a Competition RC Rock Crawler for the Super Class competition category.
This kind of RC cars are not designed for speed they are designed to climb over obstacles (usually rocks) remarkably well and manny times very surprising. You can see how they perform in this video:https://www.youtube.com/watch?v=q-tF0uGzCNE&t=11s
You can find more information about this kind of RC cars and competitions in this forum: http://www.rccrawler.com
You can download the competition rules where the different categories (Clases) are defined and how the competitions go from here: https://docs.google.com/document/d/1LWjbpH_yxB0n_0F3WMOmRx4DMo_LsBE-DuquBto_nok/edit
Some notes about this vehicle:
The superclass category is provably the most technically advanced of the RC crawlers.
Manny of characteristics of a Rock-Crawler are very different than from a speed-racing car.
Vehicle weight should be as low as possible.
CG should be as low and forward as posible. In order to achieve that CG position weights are installed on the front wheels.
As low overall weight the better.
As much suspended mass the better.
As much turning radius the better.
Brushless motors are not well suited for the task unless they are sensored (difficult to find)
Suspensions work more like a energy reservoirs systems for climbing than a normal car suspension.
On a Superclass both axles are able to steer.
So in order to meet those parameters I come up with this design/idea of how to install all equipment (most of the weight) inside of the wheel rim.
You can access to the CAD files of this project here: https://cad.onshape.com/documents/27bacf61b020beec43556ddc/w/e8cdb36f8c358f6e6ad41942/e/4e156028111cbb92cec77030
You can see the design just clicking on the link.
You need and Onshape account (it is free) in order to be able to copy, modify, export, etc. the design.
The CAD file will change and improve as time passes, it is more tested and ideas from others are added to the design.
You can find more information on the design, characteristics, and group discussion in this forum thread: http://www.rccrawler.com/forum/superclass-crawlers/594046-crazy-axles-idea-design.html
Some parts can be printed or CNC cut on Glass Fiber, Carbon Fiber or Alum. plate.
Some parts have to be made on Aluminium or Steel with a lathe.
The steering and suspension links can be made from different materials, CF tube, GF tube, Alum. bar, Steel tube, Ti Tube, etc.
There is 4 different wheels rims to choose from depending what tire you want to use and how you want to make them (CNC or 3Dprint)
There is two versions of the chassis on the CAD: V1 Gosainthan and V2 Gasherbrum. V2 version is not finished or tested.
Equipment planing to use. The links are just suggestions, there can be other compatible options:
4 x 380/385 brushed motors
380SA-3065-55 https://www.aliexpress.com/item/1PCS-Car-ship-Model-motor-380SA-3065-55-6-11V-small-electric-drill-motor-2-3MM/32847454353.html?spm=a2g0s.9042311.0.0.168b4c4d7gABNr
4 x 20-25A Motor Speed Controllers with reverse function
JMT 20A Brushed ESC https://www.aliexpress.com/item/JMT-20A-Brushed-ESC-Car-Motor-Speed-Controller-Bothway-No-brake-function-For-1-16-1/32766637613.html?spm=2114.13010708.0.0.73b94c4dwuB975
2 x 7.4V (2S) 750-850mAh Lipo batteries (one on each front wheel)
800mAh 2S https://hobbyking.com/en_us/turnigy-800mah-2s-40c-lipo-pack.html
4 x 15-25Kg/cm 180º or 270º Standard size servos
DS3218 or DS3120 https://www.aliexpress.com/item/5pcs-lot-20kg-RC-Servo-Waterproof-Aluminum-Shell-Servo-Metal-Gear-Digital-Servo-Baja-Servo-For/32832143326.html?spm=2114.13010708.0.0.73b94c4dwuB975
1 x 6+ Chanels Receiver + 1 x 6+ Programable Transmitter
Flysky FS-i6X https://www.aliexpress.com/item/Flysky-FS-i6X-2-4GHz-6CH-AFHDS-2A-RC-Transmitter-with-FS-iA6B-Receiver-FS-I6X/32840184468.html?spm=2114.13010708.0.0.3a994c4d25zFcZ
4 x Worm gear sets 30:1
1M-30T reduction ratio:1:30 copper worm gear model A https://www.aliexpress.com/item/Free-shipping-1M-30T-reduction-ratio-1-30-copper-worm-gear-reducer-transmission-parts-gear-hole/32517750717.html?spm=2114.13010708.0.0.3a994c4deod5cN
20 x Ball rod end bearings
A2 Straight plastic https://www.aliexpress.com/item/Free-Shipping-10Pcs-length-19-27mm-Bending-18-Straight-M3-ball-head-hole-Rod-End-Buckle/32680854552.html?spm=2114.13010708.0.0.3a994c4d5CXREa
Carbon tube
8x6mm tube https://www.aliexpress.com/item/TianYuQi-3k-100-full-Carbon-fiber-circular-tube-500mm-Length-OD-10mm-12mm-14mm-15mm-16mm/32815243370.html?spm=2114.13010708.0.0.3a994c4d5CXREa
4 x 90 to 110mm Shock absorbers
100mm Shock absorbers https://www.aliexpress.com/item/AXSPEED-4-PCS-lot-100mm-Axial-SCX10-D90-SUSPENSION-SHOCKS-SHOCKS-ABSORBER-100MM-RED-Blue-Green/32804872230.html?spm=2114.13010708.0.0.3a994c4d5CXREa
2 x 90mm stands off
90mm stands off https://www.aliexpress.com/item/2pcs-lot-Lightweight-aluminum-hexagonal-column-M3x50mm-M3x60mm-M3x70mm-M3x80mm-M3x90mm-M3x100mm-flight-models/32837303726.html?spm=2114.13010708.0.0.3a994c4d5CXREa
12 x Motors capacitors
1 x Capacitors array
Tires
Bearings
Screws, nuts, washers.
Pending Updates:
TO FINISH BOM AND LINKS TO POSSIBLE SUPLIERS
ASSEMBLY INSTRUCTIONS WILL BE ADDED SHORTLY
TRANSMITTER PROGRAMING AND MIXES WILL BE ADDED SHORTLY
MORE PICTURES AND ACTION VIDEOS WILL BE ADDED SHORTLY