Most recent models offer a payload of up to 5 kg and can
carry complex and heavy surveying systems, such as a single-lens reflex
(SLR) cameras. Commonly used multicopters have at least four
rotors (quadrocopter), but can havemore (hexacopter or octocopter)
for redundancy purposes. Purchase cost and maintenance typically
increases respectively, although an increase in safe operation and
payload are sometimes important factors to consider