Hello,
I have a project to fly 30 simultaneous Spark, they could tell me if it is possible or I would have interference problems.
I have already flown up to 10 simultaneous drones (S900 / S1000 / F550), but never the amount of this project.
The flight area of these drones would be half of a soccer field
Thank you in advance for your kind attention.
Best Regards,
Roberto Hurko

We've flown 7 Mavics within very close proximity and only receive 1 or 2 errors.  The Sparks are a totally separate animal though and are very prone to reception issues.

Go for it, why not use 35 20% dropout and you will still have 30.

............or 28

Hi, guys. I think it will be affected by environment. Please check the signal in wifi setting. And I would recommend users choose different channel when they fly different spark.

I would approach it as an large WIFI setup with multiple AP's. As Elektra said choose different channels and only choose  channel 1, 6 or 11 and space the RC's using the same channel as far apart as possible. You could experiment with setting a few RC's to 5.8Ghz channels but I don't know the range you need. Please let us know the outcome of your project, sounds like fun!

Flew a spark and a mavic with around 20 drones at the same time during a meet-up. There was around 12 mavic, 5 spark and 3 Phantom 4. When I flew both, there was always a warning on screen stating: "Strong signal interference, fly with cation". However, both of them flew fine within 500 metres (1640 ft). Didn't dare to fly further due to pixelated and laggy video transmission on the spark (mavic's transmission was just slightly pixelated) The controls were still pretty responsive for the most part.
As long as those 30 sparks fly within 80m (260ft) of the transmitter, there shouldn't be any issues

Wasn't there a number of 3 (three), named by DJI somewhere (manual, I guess) ?
but maybe try:

Honestly, I think Tello is best suited for this

DJT_MVSP Posted at 2018-1-10 01:54
Flew a spark and a mavic with around 20 drones at the same time during a meet-up. There was around 12 mavic, 5 spark and 3 Phantom 4. When I flew both, there was always a warning on screen stating: "Strong signal interference, fly with cation". However, both of them flew fine within 500 metres (1640 ft). Didn't dare to fly further due to pixelated and laggy video transmission on the spark (mavic's transmission was just slightly pixelated) The controls were still pretty responsive for the most part.
As long as those 30 sparks fly within 80m (260ft) of the transmitter, there shouldn't be any issues

As long as the SPARK has known software issues with the current apk apps and wifi working only on 5.8GHz , i would suggest to avoid such a event

CabinPete Posted at 2018-1-8 18:24
............or 28

Give or take one or two.

Thank for your answers !
Regards to all

How about flying 30 Sparks all linked to a single controller? I think it'd crash the app incredibly quickly, but I'd love to see it tried*

*By someone richer than I .