Very custom FPV quadcopter for my daughter

When few months ago my older daughter (10 years old) started to express interest in FPV quadcopters, I was both happy and concerned. Happy, since I would have someone to fly with. Concerned, since she has no idea how to fly, I do not have a quadcopter for her and there is a big chance she will get bored fast. So, instead of getting her a brand new, cheap, standard off-the-shelf drone, I checked my repository of “spare” parts and drones, purchased this and that and week later “Omlette du fromage” came to life…

Scarab Knife 200 cartoon sticker bomb

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Scarab Knife 200 finally in the air

It took me much more time to put my Scarab Knife 200 4″ from CarbonBird.com into the air and actually fly it. First try that happened 2 weeks ago failed due to beginner mistake: too long motor screw caused one of the motors to overheat. I had to order shorter M2 screws and redo some other things: add 1000uF 36V low-ESR capacitor to power rail, relocate VTX and X4RSB RX. Nothing super fancy. Final effect looks like this:

Scarab Knife 200 racing quad

Scarab Knife 200 racing quad

Scarab Knife 200 racing quad

There are a few problems that I hope proper tuning will solve. One of them, is strange wobble, or low frequency oscillation, on full throttle. I’m not sure what is the source of it. It might be from quite soft props. I will try replacing stock HQProp 4×4.5″ with DAL T4045. But second problem is that probably 4″ props do not match my flying style. Those small props just do not gip so much air as 5-inchers and do not keep flying path as good as I’m used to. I had similar feelings when testing JJPro P175, so that might be the case.

Next tries in 2 weeks…

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