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DJI FPV

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Re: DJI FPV

#71

Post by somehnguy »

aramachandran7 wrote: post #66
hactually wrote: post #25

Earlier quoted context omitted.

You seem in the know, any recommended sources or communities I should look into, or even if you're happy to share more I'm keen to hear it

UAV futures is also a fun youtube channel to get started with and is a little less technical than joshua bardwell at first. to have your mind blown by experienced fpv pilots, check out Nurk FPV, Johnny FPV, Mr. Steele, and Rotor Riot. FPV is a disproportionately expensive hobby ... every hard crash can cost you between $20 ( broken motor bell) to $200 (cost of entire drone when dropped in water and electronics go poo…

UAVFutures is a Banggood/affiliate marketing shill unfortunately. Can't trust a word that comes out of his mouth when it comes to product reviews (which is the vast majority of what he does).

Re: DJI FPV

#72

Post by ben7799 »

harperlee wrote: post #63
matsemann wrote: post #27

Earlier quoted context omitted.

> The 20 min flight time is a lie, Joshua Bardwell measured 10 minutes hovering. To be fair, hovering time is often lower than flight time for copters.

So 10 minutes up, then 10 minutes falling?

Anything with rotors generates extra lift when moving vs hovering, so it requires less power to hold altitude when moving vs hovering.

Imagine if you stopped the blades but the craft is still traveling forward... lift is being generated by the air flowing over one side of the rotor just liked a fixed wing aircraft.

At the extremes some full size helicopters can't climb straight up, they have to have forward motion to generate enough lift to climb. This allows use of a smaller motor to bring operating cost down.

In the case DJI drones the battery times are usually quoted with some amount of forward speed.. it generates a longer run time than a hover test.

Re: DJI FPV

#73

Post by somehnguy »

sudosysgen wrote: post #68
nomay wrote: post #60

Earlier quoted context omitted.

Isn't the edge being there's almost no delay in analog video transmission? While the best DJI can do is like 130 ms.

They say their delay for this drone is 28ms, and I'm inclined to believe them.

I've been flying DJI HD FPV for about a year now and yes - latency hovers around 24ms in good conditions. The range also blows away my normal analog gear.

Re: DJI FPV

#74

Post by somehnguy »

magnat wrote: post #14
Dave_Rosenthal wrote: post #4

There has been a huge divide in the drone world between high performance first person view (FPV) drones capable of acrobatics and the "tripod in the sky" type drones that companies like DJI have popularized. The former has been very DIY and the latter have attracted companies to build integrated solutions. This new drone from DJI brings an truly staggering amount of innovation and integration to the FPV space: - Low…

> Low res analog video -> high res digital video Major benefit of analog video is a progressive degradation of quality as a signal gets weaker and almost instant reacquisition after a complete dropout. I'm curious to see how DJI competes with that on a digital video. > ~5 minutes fly time -> ~20 minutes fly time For FPV racing that's rather a downgrade. Ideally you'd like to land with almost empty battery right after…

>Major benefit of analog video is a progressive degradation of quality as a signal gets weaker and almost instant reacquisition after a complete dropout. I'm curious to see how DJI competes with that on a digital video.

The good news is that you can find that out right now. DJI HD FPV has been available for over a year, this is just their first drone offering in the category.

The short answer is that it degrades very gracefully. They have what they call 'focus mode', where the edges of the video lose quality before the middle (where the data matters the most). Once you've used up that signal degradation threshold the rest of the frame slowly degrades to a lower bitrate, and then after that latency starts rising.

After flying analog for 5 years it only took me about 1 day to strongly prefer the DJI FPV video solution. The range is far better, and the video is mind-blowingly clear when compared to analog. On anything but my racing specific drones I have been installing the DJI HD FPV system instead of normal analog gear.

Re: DJI FPV

#75

Post by somehnguy »

cromwellian wrote: post #52

Wait, why does the goggles look like VR goggles, but the drone only has 1 camera? Wouldn't this FPV system be way more awesome with binocular vision and head tracking? Imagine flying the drone, and moving your head would move the camera gimbals, and you'd experience it like you were in VR in the drone?

That's cool to imagine, but nobody does it in practice because it isn't nearly as cool when you're doing it as imagining it makes it out to be :) Fixed camera angles are the standard in FPV. Partly because the drone itself tilts to change direction so you would lose your orientation very quickly, and partly because that would just add fragility to the drone. Something you don't want when you're likely going to crash it often.

Re: DJI FPV

#76

Post by benhurmarcel »

ben7799 wrote: post #72
harperlee wrote: post #63

Earlier quoted context omitted.

So 10 minutes up, then 10 minutes falling?

Anything with rotors generates extra lift when moving vs hovering, so it requires less power to hold altitude when moving vs hovering. Imagine if you stopped the blades but the craft is still traveling forward... lift is being generated by the air flowing over one side of the rotor just liked a fixed wing aircraft. At the extremes some full size helicopters can't climb straight up, they have to have forward motion to…

There's also simply the effect of not staying in a downstream you created.

A drone/helicopter accelerates air downward, and it's easier to accelerate still air than air that's already moving downward.

Re: DJI FPV

#77

Post by ccozan »

jaywalk wrote: post #61
wepple wrote: post #50

I’d love for someone to build an overIP bridge for this, so I can sit on the couch at home and fly through the Grand Canyon. I’d happily pay a reasonable sum for it. I wonder if it could be done using a Stadia controller and chrome cast?

Who's going to let random Internet users fly their very expensive drone?

I smell a SaaS ( or FlightaaS ) here!

Re: DJI FPV

#78

Post by ben7799 »

korse wrote: post #69

It isn't the first offering. Teal drones gave it a shot some time back and has a pretty solid product with excellent performance. They didn't get many sales with the sport models and pivoted to military and industrial applications though. I worked for them for a moment... weird company and founder, but good engineering team. Also, does anyone have a solid guess as to what sort of restrictions this thing has on it? I…

It's hard to imagine this thing not having the same GEO-zone lockouts as all the others.

I have a DJI Mavic Mini and the lockouts are very, very strict. I can't fly it at ALL at my house outside.

I wish there was a little more compromise.. in some cases it would be a heck of a lot useful if you could fly even with some draconian restriction like a 25ft max altitude. My house is in a restricted zone due to being on the flight path for an airport. But the airplanes come over my house around 150ft AGL. There are 75ft trees all the way around my property. I would have plenty of fun never going above 50ft in my yard, but DJI won't let me fly at all.

Given it's speed this FPV model would have the largest capacity for mayhem of almost any DJI model, and since it's FPV you know there will be lots of people flying it without a spotter in violation of FAA regulations.. so it makes sense for it to be at least as locked down as the other models.

I flew my drone over salt marshes near another airport that didn't have a tower over the weekend. Because it didn't have a tower it didn't have a "Red" zone near it and I could fly after acknowledging the risks. I was able to fly and keep my altitude This model looks insanely fun and I'd love to have one but realistically I bet I'd be in that situation a lot where I didn't have a spotter and couldn't fly it without knowingly breaking the rules. I didn't see anything in the material yet in terms of whether or not you can fly it line of sight without the goggles.

Re: DJI FPV

#80

Post by freakynit »

This is great... finally dji going-in for the specs that makes us vow! Pricing surely could have been better though. At $1200+, it definitely is not cheap.
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