Questions tagged [performance]

Use in questions asking about the physical capabilities or limitations of a drone/model aircraft.

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6
votes
1answer
81 views

How can I run 2207 2450Kv motors on 4S with 7” props?

I’m looking to use some spare motors I have to build a 7” rig. The problem is that they are 2450Kv, and I don’t want to burn out my other components. As I understand it, if I set a motor output limit ...
3
votes
2answers
28 views

Do propellers at different angles work the same? And do intersecting flows of air work the same?

Say a propeller pushing thrust downwards generates 70 lbs of force. If you tilted the angle of the system to 45 degrees would it generate the same thrust? If you had each rotor angled inwards of a ...
3
votes
2answers
79 views

How to reduce propeller tip losses?

I have heard that tip losses in propellers can occur when a propeller is highly loaded (when there is a much higher pressure under the prop blade than above it). This can happen with drones that fly ...
4
votes
1answer
55 views

Does the sharpness of a propeller blade affect efficiency?

Some of the propellers I have used on drones have sharp edges (sharp enough that they have cut me) and others have comparatively dull edges. Does the sharpness of the leading edge of a propeller ...
15
votes
3answers
4k views

Why are quadcopters inherently unstable?

I have heard it mentioned that quadcopters are inherently unstable and only become stable due to control. What does inherently unstable mean in this context, and why are quadcopters inherently ...
3
votes
2answers
74 views

Is there an advantage to having more LiPo cells in a low-power drone?

A major reason that high performance racing or freestyle drones use LiPo batteries with high cell count (6s rather that 3s or 4s) is so that the voltage won't sag as much. This allows high performance ...
2
votes
1answer
65 views

How do ducted fans impact drone performance?

There are many drones available which use ducted fans as opposed to open propellers. How does a ducted fan quadcopter differ in performance from an open-prop quadcopter? Note: the other question ...
4
votes
1answer
306 views

How does the center of gravity affect a quadcopter?

I have heard a lot about center of gravity for fixed wings, but very little about the CG in quadcopters. How does moving the CG forward or backward impact the flight characteristics of a quadcopter? ...
6
votes
2answers
315 views

For custom multirotors, what is the most useful method of collecting flight data?

When it is desirable to know exactly what is happening on a multirotor, such as when flight testing a new multirotor concept or design, what measurement equipment and circuit designs are most useful ...
7
votes
4answers
482 views

How does frame stiffness affect a quadcopter?

When choosing a frame for a drone, something I hear mentioned occasionally is how flexible the carbon fiber is. It seems that the general opinion is: more flex in a frame is worse. How would having a ...
3
votes
5answers
226 views

How to determine the largest LiPo I can use in a quadcopter?

Multirotors can usually operate with a larger battery than recommended for longer flight times but slightly less performance. However, there is a point of diminishing returns at which increasing the ...
5
votes
2answers
129 views

What is the performance difference between a brushless motor with a wider vs taller stator?

In the drone motor industry, there are a lot of variations in the stator sizes of brushless motors. There are several motors that have similar stator volume but one is wider and the other is taller. ...
4
votes
2answers
63 views

What is the difference between a patch and helical antenna?

I have seen both patch and helical antenna when shopping for video receiver antennae. All I know is that they are both directional antennae. Do these types of antennae have any inherent performance ...
6
votes
3answers
68 views

What is antenna gain?

As I understand it, generally, a higher gain antenna will result in a longer range and better reception for FPV flying. What is antenna gain? What makes a low-gain patch antenna different that a high-...
3
votes
1answer
105 views

How does a propeller with more blades create more “grip”

I have heard that the more blades a prop has, the more "grip" it has in the air at the expense of speed. How do more blades create more grip but lose top speed?
3
votes
2answers
63 views

Does the performance of a brushless motor decrease over time?

The brushes wear out in brushed motors and their performance decreases until they stop working, but brushless motors have fewer parts in contact and thus don't wear out nearly as fast. Does the ...
3
votes
1answer
45 views

Effect of Deadcat frame on performance?

I've seen a lot of new frames with a Deadcat style because it keeps the props out of view for cinematic videos and such. Does the Deadcat shape of frame have any effects on flight performance?