# Tag Info

20

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 is spinning through the wake of the fuselage - this results in 'lumpy' air, causing vibrations. I don't have exact figures, but I've heard anecdotally that this ...

17

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 in the University of Michigan’s 5 × 7 ft wind tunnel over different freestream flow speeds, motor thrust percentages, and hexacopter angles of attack. To ...

12

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. So at the risk of stating the obvious, propeller design is a study of the tradeoffs and compromises required to make something practical. Here's a list of some ...

9

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 based on what they see on the screen/goggles. This is analogous to VR, however not exactly the same. LOS, however, means watching the aircraft from a third-...

6

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 world. The short version is that based on evidence gathered from flight recorder logs, the ICM series gyros are more sensitive to electrical and mechanical noise ...

6

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 MPU6000 and ICM20602, you can choose which one to use. SP Racing F7 and H7 series use two ICM20602s fused together. Also, there's BrainFPV Radix which uses ...

6

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 before they have a chance to wear out. You do have to watch out for the bearings and magnets, however. With the bearings, like any mechanical component, they ...

5

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 fundamental mechanism holding the gimbal and allowing it to rotate is the same. Potentiometer (aka. pots) Potentiometers are resistors which change their value ...

5

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 that water is ~800x denser than air and results in different optimal properties for highly efficient propellers. Boat propellers generally are constrained in ...

4

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 effectiveness. Added torque allows the prop to spin up or slow down faster, which ultimate results in a better flying quad because it can more quickly and accurately ...

4

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 titanium alloy and are CNC machined in a lathe. The steel flux ring is typically pressed, and the stators are stamped from existing templates for the most part. The ...

3

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 allows the UAV to maintain a relatively constant altitude above ground level, a Facade scan tool which allows you to plan a flight path along a vertical plane at a ...

3

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, but I will say the majority of my near misses (or crashes) are due to upward/tilting into movements, and not downward tilting away.

3

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 servos have constant power, which would otherwise drop off as the voltage get's lower. If you use the original radio and receiver the range might also drop as the ...

3

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 it, for which it needs to remain in sight for safe control. Angle Mode drones are aircraft that remain level with no-stick input, and their pitch and roll are ...

3

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 batteries and propellers in concert with these changes. Generally the wider stator is capable of greater instantaneous torque, and can generate a proportionately ...

3

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're buying, patch is usually better simply in terms of size and toughness. However, consider DIYing a helical; it's cheaper, a nice project to do, and makes a ...

3

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 thus easier to pack and transport. The bulkiness of the helical is probably the main drawback. RcModelReviews has some great instructions on building your own ...

3

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 starting out or if you can only fly indoors, in which case you would want a tiny whoop. The next thing I would think about is cost. A larger drone will be ...

3

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 telemetry Has RSSI channel support on a dedicated pad and 16th channel Has a wider input voltage range than XM (3.7v-10v)

2

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 negligible amount in my opinion). If it were me, I’d go for the XM+ for the extra peace of mind.

2

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 is used to determine the position. These are less prone to wear and are more accurate. Regular gimbals use a potentiometer which is a physical sliding mechanism ...

2

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. As you can find in this question and this one, it is okay to use a battery that can supply more current than needed by your circuit. Due to Ohm's Law, I = \...

1

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 you will probably have to build it yourself. Another option that I think should work is Ardupilot, wich also has fully autonomous capability with the option to ...

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