Welcome DJI Spark Pilot!
Jump in and join our free Spark community today!
Sign up

What altitude does sound become invisible?

jlh96

New Member
Join
Feb 1, 2019
Messages
1
Likes
0
Age
22
#1
How many feet in altitude can you go before you can't hear the Spark anymore?
 

Multikoe

Well-Known Member
Join
Sep 2, 2018
Messages
70
Likes
67
Age
49
#2
There are so many factors to be considered here that it is impossible to answer.
In very quiet conditions, with no wind, no traffic and nothing to block the path of the sound, you probably can hear your drone from hundreds of meters up. Close to a freeway or the sea or with wind blowing through trees, you will not hear your drone if it is more than 10 meters up.
 
Join
Jan 12, 2019
Messages
2
Likes
0
Age
42
#4
Is there any data on noise contour profiles for a spark or other drones? Like the ones they have for commercial jets for airport developments but in miniature! I've also wondered how far away the spark can be noticeably heard from a discretion point of view, not just vertical but lateral distance as well.
 

Multikoe

Well-Known Member
Join
Sep 2, 2018
Messages
70
Likes
67
Age
49
#5
I don't think this data is available, simpy because there are no regulations regarding noise from drones so there's no need for such a profile.
However, with enough time and with the help of apps on your smartphone, you could create these profiles yourself. Download Phyphox or Science Journal for your android phone. They both allow you to measure sound-pressure. Found a quiet spot and time, lay out a grid, have your drone hoover at a couple of meters and measure the sound level on each grid point. It should then be possible with some clever arithmic to construct a sound profile.
In fact, I might do it myself, sounds fun!
 

New Threads

Forum statistics

Threads
9,112
Messages
76,050
Members
13,240
Latest member
carmar555777