digital firefry o4

By daich on Jan 29, 2025

4  0  5

a 28g digital rehash of my analog deadcat flywoo firefly - it only gained 7g going digital with 4k60 recording. nuts!

Sick of waiting for the betafpv canopy so I whipped up the jankiest canopy ever with a depleted fairy bottle. after 3 revisions I got something that just barely works -- the camera is hilariously tilted to one side. too much work to make another...this will make do until a proper canopy comes.
I just want to try this o4 board out!

Fractal Engineering's boostybaby is the secret here - the 5v BEC will suck a 1s to death while outputting a solid 5v.

I'll keep the flights on the same playlist

1st Feb 2025
indoors hover test - i got carried away and the fairy bottle is just too brittle.

2nd Feb 2025
after messing with the tune quite a bit, I made a canopy with a 3d pen and TPU, only took about 4 tries to get something usable. it looks very organic haha. Maiden flight outdoors was disappointing as there was a massive midthrottle twitch.

3rd Feb 2025
betafpv canopy came in. I swapped out the m2 mount bolts for much longer ones. I'm hoping the twitch is from over tightening the rubber isolators because the bolt was too short. If this doesn't solve the twitch the unfortunately it's probably a bad gyro.

Photos

Discussion

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SebFPV   Mar 23, 2025  
1

You are a true maker! The organic parts looks so special! What is the new weight with betafpv canopy?

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SebFPV   Mar 24, 2025 

yeah I remember multiwii multicopters with wooden frames! lot of tricopters. You can see my latest build the Draknight o4, the aluminium parts+ TPU horn/antenna holder + 8 screws is a bit heavy, around 6.5 gramms. I think it could be a good idea to switch for a tinywhoop cage instead of this rock solid but heavy aluminium cage. Is it a good idea?

daich   Mar 24, 2025 

nah man, it looks good and clean how it is! it must fly great with that KV and weight and those props. my opinion (which is generally not that popular) is that most of our quads are way over powered. weight is actually not bad if you have the right balance of motor/kv/prop. The indicator of finding that balance is that you get really good throttle response at the low end, giving you lots of confidence flying really close the ground as well as decent battery life. You'll be able to full throttle without much sag as well. I used to build things a beastly as possible but I end up flying in 20% of my throttle range which is just dumb. The only reason i would go lighter is if you want more durability and extended flight times. Maybe the only thing I would eventually switch out on your build are those motors. I find happymodel motor aluminum very soft and any hard crash messes up their balance and either bends or loosens the shaft from the bell.

SebFPV   Mar 24, 2025 

I share this philosophy, over-motorizing a quad brings additional mass and using the motors at very low rpm is catastrophic for the performance. I chose these motors for their price and low mass. For the moment I am satisfied. The original motors of the DRAKNIGHT are bigger and heavier. I can fly 9 minutes in cruise it's great, 6 minutes of mid-freestyle and about 4 minutes in hard freestyle. But I find it heavy when I compare other 2 "2s I tell myself that it would be necessary to gain weight to obtain a more precise quad.

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