Build: Umma95 Naked GoPro Cinewhoop

A few weeks ago I built the Umma85 cinewhoop – a 104g FPV drone carrying the decased GoPro Hero 6. This time I am building a slightly larger version with bigger propellers and Caddx Vista for FPV.

These light weight cinewhoop builds are extremely fun to fly (but hard to build). Here is a video I recently made:

Useful resource:

Umma85 vs. Umma95 – Which Is Better?

The main benefit of having larger propellers is power. In theory, the Umma95 can fly faster and handle windy condition better. You could also use a larger battery for longer flight time. However it will also make more noise.

In order to run larger propellers, the frame needs to be bigger too, making it harder to maneuver in tight spaces and shoot small gaps.

Thanks to the extra thrust, you can install the Caddx Vista in the Umma95 build without compromising performance too much. The HD DJI FPV system will provide much clearer image than analogue, so you can see obstacles better. It’s also more robust against noise, so it should perform better in environments with heavy multi-path interference.

Nothing is perfect, the Umma95 is bigger, together with the extra weight from the Vista FPV unit, means the Umma95 will be considerably heavier than the Umma85. This will cancel out some of the improvement in power, as well as making crashes more deadly due to the heavier impact. FYI, my Umma85 and Umma95 weights are 104g vs. 141g.

You can still use analogue for FPV in the Umma95, and you can reduce some weight and cost too :)

Parts List

Drone Parts

Instead of getting all the individual parts, you might find it easier to just get the Beta95X RTF (pre-built model):

Otherwise, you can purchase the individual components and build it from scratch.

The Beta95X frame is designed for the BetaFPV F4 16A FC stack (F4 FC board on top of a 16A 4in1 ESC). But they don’t seem to sell this stack separately so I had to use an AIO board.

I was going to use the BetaFPV AIO 20A board (whoop version), bought it from Amazon but they sent me the 12A version by mistake! Returning it means I’d have to travel an hour to get to the drop-off point, and wait another 4 days to get the replacement. No, thank you.

So that’s why I am using the 12A board in this build, you should get the 20A if you can. The 12A might work as I plan to run only 3S on this quad. 20A should be more reliable for sure, though I am not sure how well it’d fit in this 95X frame. It probably won’t get any worse than the 12A! LOL :)

And the BetaFPV AIO board has been difficult to work with in this build. You can’t access the USB port without removing it from the frame. I tried “toothpick” style FC with horizontal pointing USB port (worked great in the Umma85), but they are too big for the Beta95X frame, only the whoop style FC would fit, and the vertical pointing USB port is buried inside the frame. Not much I could do really.

For the best props for this build, check out my testing.

Umma95 Conversion Kit

You can get the Umma95 kit from here:

You can also 3D-print it yourself: https://www.thingiverse.com/thing:4345710. However the original design requires a carbon fibre plate, it’s possible to replace it with a 3D printed one using rigid material, but i have not not tested if this would work.

Naked GoPro Related

Check out the Naked GoPro Guide, it has a lot more info regarding Naked GoPro Hero 6 that’s not covered in this build log.

Assembling Umma95

The Umma95 assembly is similar to the Umma85, with the additional mount for the Caddx Vista. See how I assembled the Umma85.

The HDMI port on the GoPro main board seems to block the camera mount, I had to remove a small part of the mount with a pair of wire cutters. I’ve been told there is a new version of this mount that rectified this issue.

Preparing Naked GoPro

I am using the BetaFPV BEC board which makes the build much cleaner. You should take some thin wires (floss wires) and tie the BEC board to the GoPro main board securely (through the screw holes).

The only connection between the BEC board and flight controller is the power +/-. The BEC board is powered directly from LiPo and it converts that to 5V for the GoPro. No additional BEC required.

Here is my review of the BetaFPV BEC board and how it works.

I won’t be connecting the REC pad to the FC, as I find the record button on the BEC board more reliable and trouble-free

Building Umma95

I have to admit, it was a very challenging build, it took me about 2 days to complete :)

Attaching the motor to the BetaFPV AIO FC, then install the Caddx Vista, as well as the Crossfire receiver, with both soldered to the FC.

I was tricked by the BetaFPV FC wiring diagram, it doesn’t actually have UART6 as shown. I had to re-do my soldering a couple of times until I got it working.

Install the Naked GoPro “clean” section on the Beta95X frame, the dampeners take M2 6mm bolts which are included in the Umma95 kit.

Here are a few shots of the completed Umma95 build with Vista, AUW without battery is 141g.

Size comparison with the Umma85.

Optionally you can stick some foam tape around the duct for extra protection. It only adds less than 1 gram to the weight. the width of the duct is 8mm, so foam tape with 8mm width, 4mm or 3mm thickness should do nicely. (Purchase Link: https://amzn.to/2BmKFXb) You will need about 60cm for the 95X, 54cm for the 85x

Setup Betaflight

Let’s configure the Umma95 in Betaflight and get ready for our first flight.

Yes, you have to remove the FC from the frame in order to connect USB port. It’s a very bad design.

Using the magnetic USB cable makes it slightly less annoying :)

Since the Umma95 is a “pusher”, both the FC and motors are flipped upside down, we have to make some changes in Betaflight.

Board Roll Offset

In the Configuration tab, find Board and Sensor Alignment, and Set Roll degrees to 180

Now go to the Setup tab, and  confirm if the 3D model is now moving the same direction as your quad.

Motor Remapping

Remap motor 1 to motor 3, and motor 2 to motor 4. You can do this in Betaflight CLI. I have a tutorial explaining how Resource Remapping works.

Enter ‘resource’ and take note of the pin numbers for motors 1-4. This is going to be different on different flight controllers. These are the pin numbers from mine.

Simply swap the pin numbers for motor 1 and 3, and for motor 2 and 4.

Now test your motors and see if they work properly.

Setup Props Rotation

Finally, check motor spin directions, reverse them if necessary. You should also decide whether you want to run “props out” or “props in” (I prefer props out on this build):

Setup Switch to Control GoPro Recording

Connect GoPro REC pad to the Buzzer negative pad on the FC, then configure it in Betaflight following the instructions in this tutorial.

Setup RPM Filter

You can try setting up RPM filter to make your quad fly more smoothly. RPM filter is now supported on both BLHeli_32 and BLHeli_S ESC’s.

Tutorial: How to setup RPM filter on BLHeli_S ESC.

PID and Filter Tuning

Coming soon…

Once you’ve finished Betaflight configuration, attach the bottom plate.

Lens Protectors and ND Filter

Use ND filters, not only they make your footage look smoother, it also adds protection to the lens! This guide explains what ND filter to get.

The Vista lens protector shows a tiny bit in the GoPro’s footage, so the top part needs to be removed. It still provides enough protection, so shouldn’t be a problem.

Let me know if you have any questions.

15 thoughts on “Build: Umma95 Naked GoPro Cinewhoop

  1. Josh Suguitan

    Hi, Oscar

    Your site is extremely helpful and this page alone has convinced me to start my FPV journey with the 95x! However, to get the build that I want I just have a couple of questions I hope you could help me with..

    I need the 95v2 with the caddx vista because it already has the naked gopro wiring. Should I:

    1. Buy and convert the beta95x into a pusher whoop with beta’s pusher kit, and do the naked gopro wiring and soldering myself? Or

    2. Would it be easier to get the beta95x v2 and switch out the nano with the regular caddx vista?

    I hope this message finds you well during these coronal times. Thank you so much for all your content and guidance. I look forward to hearing back.

    Cheers!

    Reply
  2. Kent Iler

    Does the Caddix Vista handle both video and controlling receiver, or do I need to add a separate receiver with it in order to work with the DJI Goggle and Tranmitter?

    Thanks!

    –Kent

    Reply
    1. Oscar Post author

      The vista does have a SBUS output, so you can use it to control the drone and doesn’t need a separate RX.

      Reply
  3. Kent Iler

    I just ordered a 5″ RTF Quad with the DJI FPV System. I’d like to make this build to be compatible with the DJI FPV system as well.

    Would I need to use the Caddx VISTA with it to make it compatible with the DJI FPV?

    Thanks!

    –Kent

    Reply
  4. Colin

    Very cool, looking forward to building this in the future as well. And with the new Caddx Nebula Nano now you can even save some more 5g!

    Reply
  5. Martin Cox

    I wish for one of two things:
    1. DJI make a lightweight 25mW receiverless HD VTX unit for whoop type indoor models.
    2. You could partially de-case a Vista unit to save weight and fit a heatsink to whatever gets hot, I just want to run at 25mW.

    Reply
    1. Oscar Post author

      I will once I get it tuned. Not having much luck flying yet due to the windy/rainy weather.

      Reply

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