Aeronavics / Droidworx Skyjib Flat 8 v X4
- Thread starter Dependabletv
- Start date
Benjamin Rowland
Member
We tried coax for a while on our Cinestar. There were many things I liked about it, but we ran into three issues that were frustrating.
1. We caught a prop in the shot a bit more often because of the motors hanging down.
2. Significantly reduced flight times (loss of 20% or so).
3. Aircraft would yaw when correcting for wind (that was really annoying).
There are potential remedies for each of these issues that I need to explore, and folks that have used coaxial setups a lot more than we have could advise on how to overcome these issues.
Issue #1 could be remedied by putting more space between the gimbal and the aircraft (this would affect the COG, but might not be an issue).
Issue #2 could be attributed to the fact that I was using the same props top and bottom and I'm not sure if that is the best setup on a coaxial using a Hoverfly Pro.
Issue #3 is likely due to the fact that in X8 arrangement on a Hoverfly Pro, all of the top props spin in one direction and all of the bottom spin in the opposite direction. I've got some theories on why this may not be good for yaw stability on a coax with the same props.
I'd love to hear what the coax experts think because coaxials are definitely not my area of expertise.
1. We caught a prop in the shot a bit more often because of the motors hanging down.
2. Significantly reduced flight times (loss of 20% or so).
3. Aircraft would yaw when correcting for wind (that was really annoying).
There are potential remedies for each of these issues that I need to explore, and folks that have used coaxial setups a lot more than we have could advise on how to overcome these issues.
Issue #1 could be remedied by putting more space between the gimbal and the aircraft (this would affect the COG, but might not be an issue).
Issue #2 could be attributed to the fact that I was using the same props top and bottom and I'm not sure if that is the best setup on a coaxial using a Hoverfly Pro.
Issue #3 is likely due to the fact that in X8 arrangement on a Hoverfly Pro, all of the top props spin in one direction and all of the bottom spin in the opposite direction. I've got some theories on why this may not be good for yaw stability on a coax with the same props.
I'd love to hear what the coax experts think because coaxials are definitely not my area of expertise.
DucktileMedia
Drone Enthusiast
m using the XY8 config which adresses #1 assuming you are not panning with a level camera. Ive never had that yaw on mine with the HFP. It's really #2 thats the sacrifice IMHO.
Benjamin Rowland
Member
Yuri, do you run the same size props top and bottom or something different? I wonder why I was seeing the yaw issue.
DucktileMedia
Drone Enthusiast
I've used both. I usually end up with my handy APC Sf 12" on both. But I saw no difference with 13's on the bottom. Were all your arms very square to the table?
Benjamin Rowland
Member
It could be that the motors weren't perfectly lined up - tough to do with round arms. I'm building a rig with rectangular arms - we'll see if I can make coaxial work better on it.
Droider
Drone Enthusiast
Getting all props parallel to each other and the ground is important. It takes a bit of time but its worth making sure they are bob on. I have no issue with flight times. I just make sure the DOP knows exactly how long I will fly for before battery change and its never an issue. 6mins and I am coming down. If you cant get the shot needed in 6 mins then you need to practice more! In reality My Y6 is good for 9 mins with CX730/ Canon 550D and my X4 for 12 5D
Dave
Droider
Drone Enthusiast
DucktileMedia
Drone Enthusiast
I dont know how the Cinestar works but on mine, I put it upside down on a flat table and loosen the motor mounts. Then put a square against the face of the bell housings( this works on the 2814's) and just tighten it up.
Droider
Drone Enthusiast
DucktileMedia
Drone Enthusiast
That would be risky with Slow Fly props 