Drones

Camera drones, FPV quads and farm drones:

three machines that share propellers and little else. A camera drone such as a DJI Mini, Air or Mavic folds into a bag, holds its position on GPS, keeps the horizon level on a gimbal and flies itself home if the signal drops. An FPV quad is flown through goggles, often with no position hold at all, and is built for speed rather than calm footage. DJI’s Avata sits between the two, while a home-built FPV quad is a kit where every part can be swapped on its own. Plenty of FPV pilots learn stick control on a foam trainer from RC airplanes first, where a crash costs a propeller rather than a camera, and anyone who already runs a brushless car from RC cars knows the LiPo care an FPV quad asks for. Spray and mapping drones, already trialled over small farms in Zacapa and Totonicapán, are working machines on another scale, and on a used one the batteries and the spray system matter more than the airframe.

Drone weight against the cold-front winds:

from November to February the cold fronts push a hard north wind across the central plateau, and on the worst days around Guatemala City and Antigua the gusts top what any folding camera drone is rated to hold against. The lighter Mini class gives up first; an Air or a Mavic holds on longer and brings back steadier footage. If most of your flying falls in those months, buy the heavier one. The small one is easier to carry on a hike and asks less of a beginner. Sensor size is the other real split: a larger sensor keeps detail in the dim light of dawn over a lake, where a small one turns grainy.

Air-class camera drones, new and a generation old:

a mid-size DJI of the Air class runs around Q10,000 to Q11,000 new with a standard controller. What a used one should fetch depends mostly on whether its successor is on sale. DJI renews each line every year or two, and once the newer model reaches the shelves, buyers weigh the older one against it rather than against its own launch price. A replaced gimbal or arm takes it lower again, even if it flies well, because the buyer takes the repair on trust. A “4K” drone for a few hundred quetzales is a toy whose camera rarely delivers what the box says.

Gimbal, arms and flight records on a used drone:

switch it on resting on a flat surface and watch the gimbal run its start-up check. It should sweep smoothly and settle, with no buzzing, twitching or overload warning in the app. With the battery out, spin each motor by hand: grit or uneven resistance means a bent shaft or a worn bearing. Check each arm near the motor for hairline cracks. In DJI Fly, the flight records show how long it has flown and whether a flight ended abruptly. Before paying, make sure it has been removed from the seller’s account. On an FPV quad, look for split carbon where the arms meet the body and ask which video system it runs, analog, DJI or Walksnail, because the goggles have to match.

Proving a drone flies well before the buyer arrives:

start with the controller, the plain one that holds a phone or the one with its own screen, since that changes the price. State how many batteries are included, the flying time in the records and any crash or repair. For an FPV quad, add frame size, video system, receiver protocol and whether goggles are in the deal. Photograph the lens and gimbal close up, plus a screenshot of the flight records. Charge every battery before you meet: a buyer who watches it lift off, hang still and come back to land on its own has seen what no photo can show.