The Ummagawd frame finially arrived after pre ordering it back in Feb 2021. Overall, the build is simple and straight forward. While trying to keep the weight as low as possible I only 3D printed 2 parts, the motor wire cover and Caddix Vista spacer. All those items only added 1.16 grams of weight, which I think is acceptable. However, I am debating if I should switch the current battery connector from X60 to X30 so save me 3 more grams.

Whiles assembling the frame, I was too lazy to pull up an image of the frame from Ummagawds website, so I struggled a bit on the arms. But after a few tries I was able to figure the correct orientation. With a Naked Vista you can only expect max weight saving of about 10g. Also, switching out the stock antenna with an iFlight Sigma antenna, I was able to save another 1g. By using a Nebula Pro, I think you will save about 6 grams, compared to the caddx Vista.

My only complaints are the aluminum screws that was included. Sure, they are super light. But some of the hex on the screw are defective so it stripped easily. It is not a big deal, but I thought it is worth mentioning. Make sure you use some quality tool when tightening those screws. I do like that they included Titanium screws for the Ummagawd motors and frame. The frame only came with four Ti, screws but that is better than nothing.

First Test Flight Thoughts:

I flew this quad back-to-back in comparison to the BetaFPV XKnight 5” and they are totally different quads. I thought it would be similar, but I was wrong. The 2Fiddy feels more like a freestyle quad that is a little slower but better precision. The XKnight a lot faster and very sensitive. The interesting is that I am using the same PID’s and Rate profiles for both quads, but the differences are night and day. The weight difference between the quad is 20 grams, and the 2Fiddy is the lighter one. One last thing, that may make a huge difference are the props. The 2fiddy is using 2 blades and the XKnight is 3 blades. Later that day, I swapped out the tri blade props on the XKnight to Bi Blades, and it did not make a difference. The XKnight is still a rocket in comparison to the 2Fiddy. I’m not saying one is any better than the other, but they are 2 very different quads. I think the 2Fiddy is a better fit for my flying style.

Additional Changes

I guess the aluminum screws are worse than I hoped so I end up swapping it all out with Titanium screws and I only gained an extra 2 grams. Also, the Ummagawd battery straps are a tad shorter than I like, because of the larger 550mah and 650mah 6s lipos I run. So, a good replacement is the 180mm strap that RDQ sells. Because of my own mistake, I ended up frying the de cased Vista. For the time being I will be using a fully cased Vista. To help compensate the 9g I just gained, I switched out the power lead wires to 16g and XT30 connectors.

Naked GoPro Mount

Out of curiosity, I wanted to mount a Naked GoPro on the 2Fiddy frame and see how it works out. I do not plan to do any crazy freestyle flying when I have the naked GoPro mounted, because there is little to not protect for it. After doing this test, I will remove this mount and only use it if the situation asks for it. While doing a few props test with the Naked GoPro, the Gemfan 5125 Tri Blades seem to work the best. Even though the HQ T5X3 Bi Blades are my favorite, the tri blade props handle a lot better with the extra weight.

245g AUW

Obviously, this quad will not be under the 250 AUW limit if I have the DJI HD system and Naked GoPro. But to stay under this weight limit, I must use a smaller lipo battery. Ummagawd worked with GNB to develop a lipo specifically for the 2fiddy. Today, I received the GNB 380mah 6s lipo in the mail and it put me at 245g AUW. Even though these cells are rated to be HV capable, I do not plan to charge it that way because in my experience they typically degrade faster when charged to 4.35v per cell.
On my first flight, I was able to get 3:20 minutes when charged as a regular 4.2v lipo. If charge it to HV, I am sure I will get around 4 min of hard freestyle flying. If you do not mind the lower flight times, these GNB 380mah 6s lipos are awesome! Just when you think the 2fiddy could not be any better, wait until your try these 61g lipos. It will put the 2fiddy to a whole different level.

Downgrade ( July 10, 2010)

I want to build a Rekon 5 with a GPS but the only FC I had on hand was a BetaFPV F4 2-6S AIO 35A(BLHeli_32). The problem with that AIO FC is that it only has 2 full UART avalible.

Here are some are some videos of the 2fiddy in different configurations:
I replaced the Flywoo F7 stack for a BetaFPV F4 2-6S AIO 35A(BLHeli_32) because I needed it for a different project. This time around I will used Tommy’s PID settings. I pretty much followed all everything he did in his build video, with the exception of following Betaflight presets:

Vbat Compensation

set vbat_sag_compensation = 100
set vbat_pid_gain = off

HD (smoothed FF for HD cameras, strong low turn rate smoothness, low iterm relax to minimise bounce back)

set iterm_relax_cutoff = 10
set rc_smoothing_auto_smoothness = 20
set ff_interpolate_sp = AVERAGED_3
set ff_smooth_factor = 40
set ff_spike_limit = 55
set ff_boost = 0
set feedforward_transition = 40
set yaw_lowpass_hz = 70
set throttle_boost = 5
set throttle_boost_cutoff = 10
set dyn_lpf_dterm_curve_expo = 7
set gyro_rpm_notch_q = 800

Here are the PIDs for BF 4.2.X. Make sure you are in expert mode because you will need to move some of the slider to the extreme limits and it will not let you unless you are in expert mode. The tune that he has is very aggressive, but it flies well. It is kind of strange that the tune makes the motors sound kind of crunchy, but it works.

These are the rates

And finially, these are the filters.

BetaFPV 550mah 6s - HQ T5X3

GNB 380mah 6s - HQ T5X3 Bi Blade 245g AUW

Naked GoPro 7 Black - Betaflight 550mah 6s - GF 5125 Tri Blade