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21 votes

Why do most drones have upward facing motors?

One practical advantage is increased ground clearance, reducing the likelihood of a prop strike on landing or take-off. Aerodynamically, a pusher1 design can be less efficient because the propeller ...
Kralc's user avatar
  • 6,056
17 votes

Why do most drones have upward facing motors?

Expanding on @Kralc's answer: Here's a study (unfortunately behind a paywall) that I'm going to copy key parts of below: The hexacopter was mounted on a load cell test stand, and data were collected ...
Krish's user avatar
  • 752
12 votes
Accepted

Why do drone propellers have blades with thin chords?

Overview The most efficient propeller is single bladed, has infinitely narrow chord, has infinitely thin airfoil, has an infinitely long blade, spins infinitely slowly, and requires infinite torque. ...
Kenn Sebesta's user avatar
  • 1,892
10 votes
Accepted

What is the difference between FPV or LOS, angle or acro drones?

So FPV and LOS are ways to fly the drone, with FPV being First Person View and LOS being Line Of Sight. In FPV, one generally has a fixed camera on the aircraft and controls the aircraft’s movements ...
Drones and Whatnot's user avatar
7 votes

Why is an MPU6000 more well suited for drones than an ICM IMU?

There has been a good deal of discussion on this topic, and it has been no small source of conflict between several of the main firmware players in the high-performance DIY drone flight controller ...
QuadMcFly's user avatar
  • 1,200
7 votes

Why is an MPU6000 more well suited for drones than an ICM IMU?

It's not superior, it's just good enough, cheap enough and may be more noise resistant than ICM20602. There's a bunch of flight controllers with dual IMUs onboard. For example, Lumenier Lux F7 has ...
naorunaoru's user avatar
6 votes
Accepted

Does the performance of a brushless motor decrease over time?

Like most things, it depends on how you treat it. As far as I know, you should never need to worry about a brushless motor wearing out, especially for our purposes where we will likely demolish them ...
Drones and Whatnot's user avatar
6 votes
Accepted

How are Hall effect gimbals different than standard gimbals?

The difference is in how the gimbal position is sensed and reported to the processor in the transmitter. The two main types are potentiometer and hall effect gimbals, but in both types, the ...
ifconfig's user avatar
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5 votes
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Why do brushless drone motors tend to be more expensive than brushed?

Brushless motors are typically CNC machined for a large part of their manufacturing process. The top part of the bell and bearing race are machined from aluminum. The shafts typically steel or a ...
QuadMcFly's user avatar
  • 1,200
5 votes

Why do drone propellers have blades with thin chords?

As is explained briefly here on Aviation.SE and here on Physics.SE, the differences in chord length (and other properties of the propellers like diameter and pitch) are mostly derived from the fact ...
ifconfig's user avatar
  • 6,008
4 votes
Accepted

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

The simple answer is "more width equals more torque". More torque let's you drive a higher pitch or larger diameter prop effectively. Given the same size prop, it will drive it with more ...
ipaq3115's user avatar
  • 525
4 votes

Pros/cons of using a BEC in traditional nitro plane?

If you use a BEC you get a few advantages: Input voltage doesn't matter (usually it has to be at least a few Volts above the output voltage), you can probably use the LiPo you already have. The ...
zuim's user avatar
  • 171
3 votes
Accepted

Vertical Flight Paths

There is a software called UgCS which I believe should fit your requirements. It allows you to create waypoints with precise location and altitude. There are options like terrain following which ...
Jacob B's user avatar
  • 5,792
3 votes

Why do most drones have upward facing motors?

The DJI Matrice RTK has rotors on the bottom. I believe this is to avoid impact when flying upward for inspections. (Under side of a bridge for example). I'm not sure about the aerodynamic effects, ...
cliff curtis's user avatar
3 votes

What is the difference between FPV or LOS, angle or acro drones?

FPV stands for First Person View and refers to drones where there is an on-board camera giving a 'pilots eye' view. LOS means Line Of Sight and refers to a drone being flown by the pilot looking at ...
Kralc's user avatar
  • 6,056
3 votes

How are Hall effect gimbals different than standard gimbals?

Hall effect gimbals use a hall effect sensor which is an electronic component that measures magnetic fields. In the gimbal a magnet passes over the sensor and it measures the magnetic field and that ...
Paul Kendall's user avatar
3 votes

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

To simplify this discussion, it's easiest to focus on a single size class for these motors - 22XX-24XX motors on 3.5-6g propellers (5"-6"). It is also incredibly difficult to decouple effects of ...
Tehllama's user avatar
  • 846
3 votes
Accepted

What is the difference between a patch and helical antenna?

tl;dr: In terms of radio performance, they're almost identical if you compare similar-gain models, so choose based on dimensions, durability, maintainability and other practical considerations. If you'...
FlashCactus's user avatar
  • 2,997
3 votes

What is the difference between a patch and helical antenna?

It is my understanding that in general a helical antenna will perform better than a patch antenna. I should really find a source for that though. However a patch antenna is flat or nearly flat and ...
5zero7rc's user avatar
  • 1,130
3 votes

What are the advantages or buying a small drone vs a larger drone?

The first thing you should consider is what you have room for. A larger drone will normally need more space to fly and can cause more damage if crashed. I would recommend a small drone if you are just ...
Jacob B's user avatar
  • 5,792
3 votes
Accepted

Difference between XM and XM+ receivers?

According to Oscar Liang, the XM+: Is larger and heavier than XM (21.5 x 12 x 3.5 mm – 1.6 g) Has diversity antennae, unlike XM Has solder pads in addition to pin headers Doesn't support Smart Port ...
ifconfig's user avatar
  • 6,008
2 votes

Difference between XM and XM+ receivers?

As far as I know, they are almost the same. The only difference is that the XM+ has a diversity receiver so will be more reliable. It also weighs slightly more and is slightly larger (though it’s a ...
Drones and Whatnot's user avatar
2 votes

Will wiring two batteries in parallel fry my drone?

TLDR; The drone will work the same Given that weight is not an issue here (which might be the biggest concern in the real world), the only things we need to take into account are voltage and current. ...
Jacob B's user avatar
  • 5,792
1 vote

Vertical Flight Paths

If I understand your question correctly, you can do what you want with iNav, if you have a drone with a compatible flight controller that is. So you won't be able to use a DJI drone for example, and ...
Hannes Hultergård's user avatar

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