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

Best height for range

Davenwolf

Well-Known Member
Join
Aug 28, 2018
Messages
144
Likes
92
Age
56
#2
That depends on the terrain and inference from other wifi signals etc. It's really not a question that has a generalized answer I believe.
 

charliespark

Well-Known Member
Join
Mar 21, 2018
Messages
89
Likes
25
Loc
Essex UK
#4
I think the key is to have good line of sight between RC and AC. For myself on reasonably flat ground with no obstacles I go at 15-20 mts.
 

Northwood Mediaworks

Transport Canada Certified
Premium Pilot
Join
Jan 15, 2018
Messages
1,443
Likes
918
Age
60
Loc
Northern Ontario, Canada
Web
northwoodmediaworks.com
#5
Rise over run... think of a right angled triangle... especially if there is any terrain or obstructions along the way. If you have a clear path between the remote and the aircraft, that is your best setup for distance.

Me personally, I tend to go to max height allowed if I am looking to fly max distance.
 
Likes: Haggi

lmel2005

Well-Known Member
Join
May 15, 2018
Messages
479
Likes
158
Age
61
#6
Theoretically, if you draw an imaginary line from RC to spark, this shouldn't be interrupted by any obstacle.

So, as our friend Northwood says, max allowed height, would be fine for long distance flights.
 

Andre Levite

WELL-TRUSTED MEMBER
Premium Pilot
Join
Jun 18, 2018
Messages
862
Likes
553
Loc
Treasure Coast of Florida
Web
how-to-spark.com
#8
You can minimize obstructions by taking off from an elevated point such as a hilltop. And a parabolic antenna booster can add some distance cheaply.

Also need to account for any wind...

Generally speaking, the greater the altitude the stronger the wind. You can't perceive this effect from the ground. So going to the maximum height of 400ft (120m) unnecessarily can work against extended flight time.

Best practice is to fly against the wind going away and then let the wind assist you on the way home. A cross wind adversely affects you in both directions.

Greatest distance will be on the truly windless days. Lots of YouTube videos demonstrate the above

Happy flying
 
Likes: lmel2005

Mark M

Active Member
Join
Jun 14, 2018
Messages
44
Likes
24
Age
119
#9
Agreed. Winds are a HUGE consideration, especially at elevated altitudes.

I use the UAV Forecast app before I fly.

Example, for my home zip code currently:
30 ft = 16mph winds
100ft = 22mph
250ft = 28mph
500ft = 32mph
1000ft = 38mph

Spark has a top speed in sport mode of ~30mph. Using the above example, if you are trying to RTH into the 28 mph wind at 250ft, you likely won't make it.

Another plug for this app, it gives you the current forecast of KP radio wave interference which is also key to know when to fly or not.
 

Northwood Mediaworks

Transport Canada Certified
Premium Pilot
Join
Jan 15, 2018
Messages
1,443
Likes
918
Age
60
Loc
Northern Ontario, Canada
Web
northwoodmediaworks.com
#10
Consider also, that the wind forecast from UAV or other sources is based on one location, as your distance increases, the wind can vary considerably. I am very particular about the wind values if I intended to stretch the distance. And as others have said, into the wind on the first half of your flight, back with the wind behind you... Compare the gusts to the persistent wind speed... its those gusts that can lead to all sorts of nasty things, including YAW errors and ATTI mode.
 
Likes: pmshop

Northwood Mediaworks

Transport Canada Certified
Premium Pilot
Join
Jan 15, 2018
Messages
1,443
Likes
918
Age
60
Loc
Northern Ontario, Canada
Web
northwoodmediaworks.com
#11
As for KP.... this is the definition in UAV Forecast.. however, I have heard dissenting opinions on how risky it truly is....

The Kp index measures geomagnetic disruption caused by solar activity, on a scale from 0 (calm) to 9 (major storm). The higher the Kp index, the more likely you are to have problems. Kp's of 1-4 are completely safe. At a Kp of 5, you'll have problems perhaps 1% of the time. At a Kp of 6, you'll lose an average of 5% of your locked satellites; at 7, you'll lose roughly one third.
Solar activity interferes with GPS signals in two ways, both due to disruptions in the ionosphere.
(1) It decreases the signal-to-noise ratio and affects carrier frequency, causing the receiver to lose lock on some satellites. Instead of 9 satellites, you might lock only 6, or the number might fluctuate from second to second.
(2) It changes the propagation delay through the ionosphere, making GPS positioning inaccurate even if the receiver has all satellites locked.
Even during a major storm, the extent to which you see these problems will depend on many other factors, including your latitude (worse at high latitudes) and the time of day (worse at night). Sometimes everything will be fine. At other times you'll lose lock completely, or appear to have a lock but the position will actually be wrong by hundreds of feet.
The storms can also interfere with radio control signals, or with the onboard electronics.
So in general it's better to play it safe during solar storms at Kp of 6, even though most of the time you won't notice any issues. At 7 or higher, you're better off sitting inside and flying a simulator. Happy flying!
For current and forecast Kp conditions, as well as the weather, see http://www.UAVForecast.com.
 

New Threads

Forum statistics

Threads
9,153
Messages
76,426
Members
13,265
Latest member
wadewave