FPV Image quality benchmark

This is FPV250 low hung frame equiped with a fatshark fpv camera set.
The fpv camera is mounted in the clean section of this frame.

As I noticed in my previous vibration test the low hung frame performs very well on reducing vibrations. And this has a huge (positive) effect on image quality.

The movie speaks for itself. Just watch it.

Low hung clean and dirty kit

The HobbyKing "low hung clean and dirty kit" is created to reduce vibrations on fpv camera. This frame divides the quad in 2 parts. An upper deck that is dirty (vibrations) and a lower deck that is clean (no vibrations).






Hardware:
It is still the same setup. Same unbalenced props and motors. All power equipment (motors, esc, power distributor, battery) are mounted upper deck in the dirty part of this frame. The Flight controller bluetooth and receiver are mounted lower deck on the clean part. For this benchmark I don't mount any FPV gear yet.



Benchmark:

As you can see the results are really good. ACC an GYRO values (graph) are flat. This means that the clean kit is really clean and has no vibration issues. This should improve image quality or remove jello effect on a FPV cam. Even the MAG values are now a flat line. This is the result of mounting the flight controller lower deck. This makes the distance between the magnemoter and motors/esc larger and thus reducing the interference caused by EMF (high current).

DIY Solution for vibration reduction

In my first quadcopter project I already introduced some cheap and easy to build motor mounts that reduce vibration almost completely.

Downside of these motors mounts is the fact that they add 95 grams of weight to my little quad. But it really kills the vibration and the quad is flying super smooth. No shaking, no aggressive corrections, no wobble.



These motor mounts can also be made carbon fiber sheets. That will reduce the weight. With 1.5mm carbon fiber it will weigh around 45 grams (set of 4)



hardware:
It is the same setup as my previous blogpost. With same motors and the same props, nothing changed. Only added the vibration reduction motor mounts. (motors and props are still unbalanced)



benchmark:

As you can see the ACC and GYRO values (graph) is almost completely flat. The vibration reduction motor mounts do their job. This should have a positive effect on image quality when I would mount an FPV camera. But there is just not enough room on this frame to mount all that equipment (cam&tx)

FPV 250 vibration test

This is my current FPV 250 setup it does fly but it has vibration issues causing it be a little bit unstable (wobble). If I would mount FPV cam I would for sure have decreased image quality and jello effect on my fpv recordings. (motors and props are unballanced)






hardware:
- Hobbyking FPV 250 frame
- C20-1550KV brushless motors
- 6x4.5 inch TRI-blade props
- HK blueseries 12A ESC
- HK Multiwii 328P flight controller
- Live telemetry Bleutooth module
- 4CH analog 40mhz reciever
- 3000mAh 3Cell Lipo

benchmark:

because my setup has a bluetooth module I can connect my laptop over bleutooth to my quad during flight and have live telemetry. Vibrations caused by motors and prop have influence on gyro and acc values. When hovering in air these gyro en acc values should produce a nearly flat line. As you can see on my screenshot this is not case.