Welcome, Commercial Drone Pilots!
Join our growing community today!
Sign up

What is a HELIX

Kaifect

Well-Known Member
Joined
Jan 18, 2018
Messages
50
Reaction score
7
Age
60
Location
Illinois
Website
www.kaifect.com
I have a client that asked for this video. Of course I said sure, but now I need to figure out what it means.

"When you do a bridge video i was thinking what would be cool is if you do a straight fly over of the bridge and then go backwards doing a helix looping around the bridge so you can see above and below the bridge"

Could someone explain what is is and ( I know its a long shot) post a link to a video, or some tips on completing it. I keep picturing a drone in the river on this project.

Thanks.
 

sar104

Active Member
Joined
Dec 25, 2017
Messages
38
Reaction score
19
Location
Los Alamos, NM.
I guess the idea is flying a helical trajectory backwards with the bridge on the helix axis. The flight path would look something like this:

Image15.gif

It would be very challenging to program, let alone execute.
 

sar104

Active Member
Joined
Dec 25, 2017
Messages
38
Reaction score
19
Location
Los Alamos, NM.
I presented this video to the local FAA Safety Officer, several months ago, they were upset and noted he violated a number of rules.
I wouldn't be surprised this was forward to Washington. Sorry guys, I didn't find this video amusing.

I didn't post it to amuse you. I posted it to illustrate that helical flight paths are possible.
 

BigAl07

Administrator
Staff member
DSAR Member
Joined
Jan 8, 2018
Messages
2,671
Reaction score
2,287
Age
51
Location
Western North Carolina
I have a client that asked for this video. Of course I said sure, but now I need to figure out what it means.

"When you do a bridge video i was thinking what would be cool is if you do a straight fly over of the bridge and then go backwards doing a helix looping around the bridge so you can see above and below the bridge"

Could someone explain what is is and ( I know its a long shot) post a link to a video, or some tips on completing it. I keep picturing a drone in the river on this project.

Thanks.
I just can't fully wrap my mind around a true pull back helix flight. I'm sure it can be done but it would be VERY difficult to be done smoothly and accurately.

I'd ask them for more details about exactly what they are looking to have you do. Maybe provide an example/link or something to one they've seen.

I'm sure it can be done though.

I've watched that video probably over 2 dozen times. That guy has some major flying skills even though he did bust a couple of CBO guidelines and actually "trespassing" 1x in there LOL.
 
  • Like
Reactions: sar104

Kaifect

Well-Known Member
Joined
Jan 18, 2018
Messages
50
Reaction score
7
Age
60
Location
Illinois
Website
www.kaifect.com
Thanks for all the input. The diagram was extremely helpful. I am definitely going to try a maneuver like that but not around a bridge, or over water. I will send the client another type video that will show off all of the bridge.
I found that video interesting in some areas, and nauseating in others. Going through some of the obstacles was fun to watch and would be fine to try with someone else's drone.
I'm not a big rules guy but flying that close to a train makes us all look bad.
Thanks again for the help, you guys are great.
 

sar104

Active Member
Joined
Dec 25, 2017
Messages
38
Reaction score
19
Location
Los Alamos, NM.
Thanks for all the input. The diagram was extremely helpful. I am definitely going to try a maneuver like that but not around a bridge, or over water. I will send the client another type video that will show off all of the bridge.
I found that video interesting in some areas, and nauseating in others. Going through some of the obstacles was fun to watch and would be fine to try with someone else's drone.
I'm not a big rules guy but flying that close to a train makes us all look bad.
Thanks again for the help, you guys are great.

In theory you could create a Litchi mission that describes such a flight path since the equation describing a helix is quite simple and then all one would have to do is transform it into lat/long/altitude with the bridge centerline as the axis. That's the easy part though - the important question would be whether it would need very dense waypoints or whether it would execute curved turns in the vertical, as well as horizontal plane.
 

sar104

Active Member
Joined
Dec 25, 2017
Messages
38
Reaction score
19
Location
Los Alamos, NM.
I used Litchi but I wouldn't even know where to start making something like that. Where can I learn to do that?

I doubt that it's ever been done since it's not really what Litchi was designed for, but the concept involves fairly straightforward mathematics. I'd be willing to try it to see if it works (without a bridge in the way to begin with). For added realism, how big is the bridge? What I'm really interested in is what would be the approximate radius and pitch of the helix?
 
  • Like
Reactions: BigAl07

Kaifect

Well-Known Member
Joined
Jan 18, 2018
Messages
50
Reaction score
7
Age
60
Location
Illinois
Website
www.kaifect.com
Just guessing the bridge is two lanes wide and about 150 feet across the river. At normal water level the bridge bottom is about 20 feet from surface of the water.
 

sar104

Active Member
Joined
Dec 25, 2017
Messages
38
Reaction score
19
Location
Los Alamos, NM.
Just guessing the bridge is two lanes wide and about 150 feet across the river. At normal water level the bridge bottom is about 20 feet from surface of the water.

That's pretty tight. So a helix maybe 60 ft in diameter, 150 ft long, 50 ft pitch (3 turns) and with the lower extent only a couple of meters from the water?
 

sar104

Active Member
Joined
Dec 25, 2017
Messages
38
Reaction score
19
Location
Los Alamos, NM.
Just as an illustration, this is a Litchi mission flying a helix over water of about the right dimensions constructed from 100 waypoints. I haven't defined any actions other than the flight path itself.

Mission Hub - Litchi

It's not easy to visualize in the Mission Hub - this is what it looks like in Google Earth:

screenshot93.jpg

The question is how smoothly will it fly the route and will adding curved turns help.

Attached is a 3D kml description of the path that will open in Google Earth and allow you to see the helix from various angles, but you will need to delete the .txt extension that I added to allow it to upload.
 

Attachments

  • helix_03.kml.txt
    28.2 KB · Views: 7
  • Like
Reactions: BigAl07

New Threads

Members online

Forum statistics

Threads
3,723
Messages
34,492
Members
5,220
Latest member
dnareiss