Why the Holy Stone HS720 may stop flying after a crash
If your Holy Stone HS720 not flying after crash, the issue is often mechanical or sensor-related rather than a total failure.
Even a light impact can knock props out of balance, damage a motor shaft, loosen wiring, or disrupt calibration.
The HS720 is a GPS-enabled camera drone, so post-crash problems can also involve the flight controller, compass, IMU, or battery connection.
The key is to inspect in a logical order so you can isolate whether the drone is unsafe to arm, unable to take off, or taking off but drifting and falling.
Start with the basics before powering on
Before troubleshooting flight behavior, make sure the drone is physically safe to test.
A crash can create hidden damage that looks minor but causes motor overload or unstable flight.
- Remove the battery before inspecting the frame or props.
- Check for cracks in the arms, shell, or landing gear.
- Look for bent propeller blades, chips, or loose mounting points.
- Inspect the camera gimbal area and any exposed wiring.
- Verify that the battery casing is not swollen, punctured, or loose in the bay.
If the drone took a hard impact, do not attempt repeated takeoffs until the frame and propulsion system look sound.
Repeated power-ups can worsen motor or ESC damage.
Check the propellers and motor assembly
Propeller damage is one of the most common reasons a Holy Stone HS720 not flying after crash.
A propeller can look usable at a glance while still being warped enough to prevent lift or trigger motor strain.
What to inspect on the props
- Correct propeller placement on each arm
- Cracks, bends, or missing sections
- Loose screws or mounting caps
- Matching orientation on clockwise and counterclockwise blades
Replace any questionable propeller immediately.
Even if only one blade was damaged, replace the full pair or set if balance is uncertain.
Uneven lift can make the HS720 flip on takeoff.
What to inspect on the motors
Spin each motor gently by hand with the battery removed.
The motion should feel smooth and consistent.
Grinding, stiffness, or wobble can indicate bent shafts, debris inside the motor, or bearing damage.
If one motor sounds different from the others during startup, the crash may have damaged the motor or its wiring.
In that case, a test with fresh props will not solve the problem until the underlying motor issue is fixed.
Confirm the battery is delivering power correctly
A crash can jolt the battery loose enough to interrupt power delivery even when the drone appears to turn on.
Because the HS720 depends on stable voltage, a weak connection can cause failed arm, sudden shutdown, or insufficient thrust.
- Re-seat the battery until it clicks securely into place.
- Inspect the battery contacts for dirt, corrosion, or bending.
- Confirm the battery is charged with the original charger or a compatible replacement.
- Test with a second battery if available.
If the LEDs power on but the drone cannot lift off, the battery may still be too weak under load.
Crash damage can also create a motor that draws extra current, which makes an otherwise healthy battery appear bad.
Recalibrate the compass and IMU after a crash
After impact, the Holy Stone HS720 may need recalibration because sensor alignment can be affected.
This is especially relevant if the drone powers on normally but drifts, tilts, or refuses to hold position.
Compass issues
The compass helps the drone determine heading for GPS-assisted flight.
If the drone was crashed near metal, concrete reinforcement, cars, or electrical equipment, interference may trigger incorrect readings.
Recalibrate in an open outdoor area away from magnetic interference.
IMU issues
The IMU measures attitude and movement.
If the drone seems to lean at startup or respond unevenly to throttle, an IMU reset or calibration may be necessary.
Let the drone sit on a flat, level surface before calibrating, and avoid touching it during the process.
Many post-crash instability reports are caused by poor calibration rather than broken electronics, so this step is worth doing before replacing parts.
Verify the controller and app connection
Sometimes the drone is mechanically fine, but the controller or app link is what prevents flight.
If the HS720 is not pairing properly after a crash, it may not arm or may fail to receive takeoff commands.
- Power on the controller first, then the drone.
- Check that the app recognizes the aircraft model.
- Rebind or reconnect the remote if the signal appears unstable.
- Make sure the sticks center correctly and trim settings are not extreme.
If the drone is getting command input but still will not lift, the issue is more likely in the propulsion or sensor system than in the transmitter.
Look for safety lock conditions that block takeoff
Many GPS drones will not arm if they detect an error state.
After a crash, the Holy Stone HS720 may refuse to take off because it believes conditions are unsafe.
Common lockout triggers
- Low battery voltage
- Compass error
- IMU instability
- Propeller installation error
- Motor obstruction
- Unstable GPS lock in certain flight modes
If the app or controller shows a warning, resolve that code first.
Even a small propeller installation mistake can prevent arming, so double-check left-right orientation and tightness.
Test for hidden frame or arm damage
Some crash damage is not obvious until the drone tries to hover.
A slightly bent arm can alter thrust geometry enough to make the drone roll, yaw, or surge forward.
Place the HS720 on a level surface and compare each arm visually.
Look for asymmetry, cracks near the motor base, or twisting where the arm meets the body.
If the shell flexes more than before, internal mounting points may be damaged.
When frame damage is present, the drone may still power up but become unflyable in practice.
Structural repairs are often required before further testing.
Try a controlled hover test only after inspection
Once the props, motors, battery, calibration, and frame have been checked, perform a brief hover test in an open area with no obstacles.
Keep the drone low to the ground and ready to throttle down immediately if it drifts or vibrates excessively.
- Lift only a few feet off the ground.
- Listen for unusual motor noise.
- Watch for one side rising faster than the other.
- Stop immediately if the drone shakes, flips, or yaws hard.
A successful hover usually means the main issue was a loose prop, calibration problem, or battery seating issue.
A failed hover points toward deeper motor, ESC, or frame damage.
When replacement parts are the likely fix
If your Holy Stone HS720 not flying after crash even after calibration and connection checks, replacement parts are often the practical next step.
The most commonly replaced items are propellers, motors, motor mounts, and batteries.
Consider parts replacement if you notice any of the following:
- One motor spins slower or makes scraping sounds
- The drone lifts unevenly even with new props
- The battery connection is intermittent
- The frame has visible cracks or warping
- The drone repeatedly flips despite correct prop installation
For warranty or support cases, document the damage with photos and note what troubleshooting steps you already tried.
That makes it easier to determine whether repair, replacement, or service is the best option.
How to reduce crash-related failures in the future
Preventing a repeat issue starts with post-flight inspection and safer takeoff habits.
The HS720’s camera drone design makes it sensitive to prop damage and calibration drift, especially after rough landings.
- Inspect props before every flight
- Calibrate after transport or impact
- Avoid launching from dusty or uneven surfaces
- Keep spare propellers and a fully charged battery ready
- Store the drone so the arms and props are not under pressure
Consistent preflight checks reduce the chance that a minor crash becomes a permanent no-fly problem.