If your RC car slams into the ground after big jumps, change the shock oil before you touch the springs. Thicker oil, and sometimes a piston with smaller holes, increases damping resistance and can help control how quickly the shock compresses on landing. Springs hold the truck at ride height and shape its handling. A…
If your RC car pulls to one side under braking but tracks straight under power, the cause is usually an imbalance somewhere in the car. Braking shifts weight onto the front wheels, and that load makes small imbalances in the bearings, shocks, steering, or chassis show up. Turning the steering trim on your transmitter won’t…
You arm the quad, add a little throttle, and it rolls onto its back before it clears the floor. That is often a setup mismatch rather than a dead part. Oscar Liang’s takeoff troubleshooting guide traces it to configuration and calls faulty components rare. The first things to rule out are the prop placement, the…
When a drone battery won’t balance charge and one cell stays low, the cause is either the balance lead or the cell itself. A multimeter on the balance plug will tell you which in a few minutes. If the cell turns out to be the problem, the pack is probably done. A LiPo cell that…
For a TRX-4 Sport, the INJORA INJS235 and Power HD LW-25MG are two sub-$50 steering servo options worth comparing, provided their fitment and waterproofing claims check out. On the Sport’s 6V supply, both are rated at roughly 23 to 25 kg-cm, more than double the 9 kg-cm of the stock Traxxas 2075X. The DSServo DS3218…
On my 3m x 2m yard course, the Traxxas TRX-4 Sport handled the tight spots better than the Redcat Gen8. It maneuvered through the narrow gaps between rocks and slid over logs instead of getting hung up on them. The Gen8 is a capable crawler on open trails, but in a space this small, it…
RC car traction roll happens when your tires grip the carpet so hard that the car tips over instead of sliding. A common first adjustment for traction roll on carpet is to apply a thin layer of CA glue to the outer sidewalls of the front tires. If that isn’t enough, stiffer sway bars, a…
If your drone flips over immediately on takeoff, the flight controller is almost certainly correcting in the wrong direction. The usual causes are incorrect propeller placement, mismatched motor direction, incorrect motor mapping, or a flight controller (FC) orientation that doesn’t match its physical mounting. All four can be checked at your desk, with the props…
An RC servo that buzzes without turning may be stalled. It may be receiving power and a control signal, but something is preventing the output shaft from reaching its commanded position. The fastest way to sort out the cause is to take the servo horn off the linkage and try it with nothing attached. If…
Unplug the battery as soon as you see FPV drone ESC smoke, and leave it unplugged until you’ve checked the power path with a multimeter. Smoke at the moment of plug-in often points to a short circuit, reversed polarity, or another electrical fault in the battery power path. The ESC may not be the only…
