General
rules
more engines mean more power and more
lift. That means more batteries. That means more time in the air
Tricopters: cheap, easy to build, least stable, not
as robust (tail servo and mechanics), low lifting power and flight time
(because the motors have to run faster to hold it all in the air). No engine
out capability.
Quadcopters: mechanically simpler than tricopters. While they weigh almost the same they have about 1/3 more lift, they are usually more stable (no servo issues) and are capable of staying airborne for a little while longer (they can either lift larger batteries or fly more economically because the weight is spread across 4 motors and not just 3). Still no engine out capability. If it fails, it goes down.
Hexacopters: All the good things that quads have, plus more power and more lifting capability. As a bonus they add limited engine out capability - a hexacopter can lose any single engine and still land (it will lose yaw control though), and if it loses one or both engines on the neutral torque bar it could even continue flying unaffected. Downside is that they are larger and a little pricier, especially if you're running high-grade motors like AXI.
Octocopters : All the good things from hexacopters, plus true engine out ability. Loses any single one and still flies fine. This is what you fly if you need horsepower and reliability in one package. But octacopter has very low maneuverability.
Quadcopters: mechanically simpler than tricopters. While they weigh almost the same they have about 1/3 more lift, they are usually more stable (no servo issues) and are capable of staying airborne for a little while longer (they can either lift larger batteries or fly more economically because the weight is spread across 4 motors and not just 3). Still no engine out capability. If it fails, it goes down.
Hexacopters: All the good things that quads have, plus more power and more lifting capability. As a bonus they add limited engine out capability - a hexacopter can lose any single engine and still land (it will lose yaw control though), and if it loses one or both engines on the neutral torque bar it could even continue flying unaffected. Downside is that they are larger and a little pricier, especially if you're running high-grade motors like AXI.
Octocopters : All the good things from hexacopters, plus true engine out ability. Loses any single one and still flies fine. This is what you fly if you need horsepower and reliability in one package. But octacopter has very low maneuverability.
The below table show the advantages and
disadvantes of multirotor configurations
Disadvantages
|
Advantages
|
Frame Configurations
|
·
No Redundancy
·
yaw mechanism problems
·
low lifting power and flight time
·
|
·
Simple & Cheap
·
very agile
·
High maneuverability
|
Tricopter
|
·
No Redundancy
|
·
Simple & Cheap
·
Simple mechanical
design
·
no servo issues
|
Quadcopter
|
·
More expensive
·
Poor Efficiency & Complex Mechanics
·
Low maneuverability.
|
·
Limited Redundancy & Larger Payload
Capacity
·
High stability and Wind Resistance
|
Hexa-Copter
|
·
Large and
expensive& Inefficient
·
Very Low
maneuverability.
·
High power consumption
|
·
True Redundancy & High stability and Wind
Resistance
·
Very High Lift
Capacity
|
Octacopter
|
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