(I can NOT use the "Whoopee" name, Oscar, if you'd like. Just let me know)



I... honestly love this quad. It pokes along slowly. It almost defies physics with its slow decent ... My ONLY issue is that it's very fragile and pretty wind intolerant.

This build is essentially an exercise in stealing other people's creative works.

Namely: The frame is basically this meant for the QX90 bits and pieces. I have, however, made the following modifications:

• Chopped off the top to help reduce weight a bit.
  
• Removed the top supports for the motors and put them underneath with some vertical cutouts. The fit on this is VERY tight. Sanding is required. I print in PLA and brushed motors get hot enough to make PLA pliable. The frame doesn't fall apart (yet) but the fit gets loose. The cuts are helpful in case you need to add zip ties to hold the motors in place (which i had to do).
  
• Added support for this gem of a AIO mount.
  

*Notice the white top? That's because the first print of this frame was white. Then I melted it with a hairdryer trying to heat shrink some landing gear ...  


The props on this are seemingly universally hated. They get bad reviews from ... everybody? ... for being fragile and inefficient. I'm not gonna lie. They ARE fragile. Fortunately the ducts protect them. Fit is variable. But they're cheap and with this setup I get between 4:30-5:45 flight times depending on the battery selection (500 or 750).  I'm guessing lower mah batteries could be used. The 500 mah batteries I have listed below ... don't seem great.  They've served me well, but they don't seem to be holding up all that well. If they're your only option, they'll do. If you can get your hands on some higher C higher quality batteries - do that.

I have another build that has a voltage alarm - and with the 500mah options the voltage alarm sounds anytime you're off the ground. This is not the case with the 750 mah batteries I have.

The rest of the build:
Motors: Chaoli 820
FC: SciSky
FPV: FX798t
Props: Eachine 3-Blade Props
Weight: ~41g (no batteries)
Batteries: 500mah and 750mah

I think you could shed a gram at least by shortening the wires and eliminating the little JST connectors.

The SciSky is running Cleanflight and has the following PIDs, which seem to work pretty well (but I'm a n00b).

MultiRewrite
Roll [64,20,35]
Pitch [64,20,35]
Yaw [80,45,0]

Video in windy conditions (15mph winds):

nice that's pretty light for a ducted brushed quad