OPEN QUAD TANK

thingiverse

OPEN QUAD TANK I've been working on this project in my free time, but my job has taken me to South Korea for several months now, making it impossible for me to continue designing with my current computer and lack of printer. This project needs a lot of love, and members from both the FPV and 3D printing communities have expressed interest in turning it into a group effort, which I'm excited to see how awesome we can make it together. Please check out these files: GOALS MATERIAL CONSIDERATIONS HARDWARE SETUP DESIGN FLAWS / TO DO LIST HOW TO HELP Many creators inspired this project and taught me what I needed to get this far, some of whom are listed here. Please support them by checking their YouTube channels. * Daniel Noree * Thomas Sanladerer * Aloha FPV * Kalani J * Flite Test * 3D Printing Nerd All files are of my own design and I permit them to be modified, copied, and used but not sold. Primary Goals of this project: 1. HAVE FUN 2. Should be printable on cheap printers such as Wanhao i3, other i3 clones, cr-10s, and other printers with similar build volume. 3. Should use parts common to FPV mini quads. 4. Should not rely on exotic materials (nylon would make the gearbox easier to design but we want everyone to be able to print this). 5. Should maximize printed parts and eliminate purchased hardware whenever possible to KEEP IT CHEAP Printing material suggestions for current files: Everything COULD be printed in PLA, but the gearbox would need heavy lubrication before running. Also using a 3s battery would increase survivability as well. I suggest PEGT be used for the gearbox and all load-bearing parts due to its flex before breaking properties and higher resistance to heat. Hardware used: * An assortment of M3 screws * Lots of them * 1” 16 or 18 ga finish nails for tracks (I'll try to clear this up) * Bearing 3x8x4 3mm hole 8mm tall 4mm thick * Bearing 10x15x4 10mm hole 15mm tall 4mm thick * Xm20 ESCs x2 or any miniquad ESC capable of 3D mode on BLheli * PDB, one with current sensing and OSD would be best * RC radio with receiver capable of PWM (one with pins for each channel) not SBUS * Wire and heatshrink * Xt60 connectors * MOTORS- currently using NTM propdrive 2826 1200KV/ lower KV would be better for the current gearbox * FUTURE MOTOR OPTIONS- hopefully going to design gearbox for use with 22XX miniquad motors which produce 100-200 more watts of power than the NTM motors even with the size difference. For FPV: * Connect each ESC to the PDB as usually for miniquads * Connect the signal wires to receiver on the elevator and aileron channels (you may need to solder on some old school PWM connectors) * Connect the 5v out and ground to the receiver using PWM connector * Wire a battery lead to the PDB * USE 2-4s If you get strange results with the lower voltage, try to up the start-up power of the ESCs in BLheli. 4s usually works just fine but 2s gave me issues Programming your radio: * You want to use elevon mixing, look it up on YouTube * May have to do both between channel mixing and swapping the connectors on the receiver to get everything going in the right directions * Reduce your rates to 60% or less on all channels if using 4s. Increasing this value will make your tank faster but I began to break PLA parts at 65%. Stronger designs and PEGT tracks may allow for higher rates on 4s Problems with the current design in order of severity: 1. no front wheel tensioner makes the track jump off regularly on slow turns Fix- design and add tensioner 2. PLA tracks break at the joint Fix- print in PETG / increate tempt and extrusion multiplier on PLA/ in cad software increase material at weak point 3. suspension incomplete Fix design suspension / or just glue suspension arms in place for now (I used hot glue) 4. gearbox uses uncommon motor Fix increase gear ratio to 18:1 for 2300kv motors and redesign motor mount 5. no top Fix Design any top you like and share (I want to see a T34-85)