Sparrow

Introduction:

I was getting ready to build myself a custom uruav ur65 after the frame finally arrived in the mail. After putting most of it together, I realized that the HappyModel 19000kv motors didn't spin. They all twitched, but none of them really spun. I couldn't believe how poorly made they were. Since everything else was ready to go, I decided to switch the frame to a boldclash b06 instead.

Components:

  • Boldclash B06 Frame
  • Boldclash 0703 15000kv motors Racerstar 0703 20000kv motors x4
  • Frsky 8 channel receiver
  • King Kong 41mm props
  • LST S2 AIO camera/vtx
  • Beecore F3 FC & 5A ESC

Conclusion:

Using these lighweight aio fc/esc combo boards really makes things simpler. The whole thing only took a couple hours. I had to use a soldering iron to melt out parts of the canopy to fit the AIO camera/vtx.

The stock boldclash b06 weighed in at 28g, but mine came in at 23g. It also has OSD and dshot for turtle mode which the original did not have. I was amazed at how much better this custom one flew over the original. The original was a bit twitchy and never flew right for some reason. However, this quad suffered from the exact same type of drift as bender. For bender, I thought it was most likely the way I mounted the flight controller, but now I realize that it is most likely just this type of frame. Once you trim out the acc in betaflight though, it is not that noticeable in acro mode.

At the time of this writing, I put 3 packs of GNB 550mah 1s through it. Two were for testing and the last pack for flying. These are the HV type, but only charged to 4.2. They yield about 4 mins of flight coming down with about 3.85v. You can definitely fly longer, but unlike flying 2s, you definitely feel the lack of power at around 3.8v. I think 450mah may be a better fit for this quad as the 550mah will not turtle over due to weight. I also put in a 260mah pack through it just for kicks. It actually flew really well, but only lasted a bit over a minute. It felt much lighter and more nimble (like bender using 300mah packs).

To sum it up, it flies very smooth like bender, but without as much punch. Very easy to handle and predictable. It ranks up there as one of my favorites, but the thing holding it back is the lack of power for turtle.

Update 7/23/18 - tried some 41mm 4 bladed props and turtle mode works perfectly now. Battery drops by a bit, but is offset by tighter cornering. Flying in areas where tight turns are not required, I actually prefer the 3 bladed props for the overall smooth feel. However, turtle mode is pretty important, so my preference goes to the 4 bladed props.

Update 11/14/18 - One of the motors broke and I didn't feel like buying a replacement. They're good motors, but just not up to taking any sort of abuse. I replaced them with racerstar 0703 20000kv motors instead. The racerstars run well, but are very inefficient. I went from 4:30 flight times to 1:30. I'm probably going to replace the racerstars with something else.