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Old 08-27-2021, 01:29 AM   #1 (permalink)
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Default EDF quad

Found this on youtube.


EDF quad | qf2611 4000kv 50mm edf fettec aio proto 4s1300 120c (2 min 58 sec)
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Old 08-27-2021, 03:43 AM   #2 (permalink)
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Actually quite strange that there aren't more of these around. The 50mm EDFs aren't very expensive.

I like it.
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Old 08-27-2021, 06:06 AM   #3 (permalink)
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Quote:
Originally Posted by Thoemse View Post
Actually quite strange that there aren't more of these around. The 50mm EDFs aren't very expensive.

I like it.
Efficiency, a small diameter fan is far less efficient than a large diameter prop (plus the added weight of the duct doesnt help)

Same reason that helicopters have huge rotors instead of a much smaller high rpm fans.
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Old 08-27-2021, 07:00 AM   #4 (permalink)
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Well of course but it's a very cool thing to build right? 😂
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Old 08-27-2021, 07:04 AM   #5 (permalink)
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Wow. Not sure How he keeps orientation. Very cool.

Rick
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Old 08-27-2021, 02:09 PM   #6 (permalink)
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Probably flown FPV.
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Old 08-28-2021, 01:30 AM   #7 (permalink)
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Quote:
Originally Posted by Smoggie View Post
Efficiency, a small diameter fan is far less efficient than a large diameter prop (plus the added weight of the duct doesnt help)

Same reason that helicopters have huge rotors instead of a much smaller high rpm fans.

EDFs aren't really well designed for this. If the lip of the duct is designed correctly with an outwardly curved lip it can provide up to 40% additional aerodynamic lift essentially "for free". The hiller flying platform used this trick which is why it was able to have a useful range, almost half the lift was aerodynamic not just direct thrust from the ducted fan.
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Old 08-28-2021, 02:37 AM   #8 (permalink)
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Quote:
Originally Posted by Atomic Skull View Post
EDFs aren't really well designed for this. If the lip of the duct is designed correctly with an outwardly curved lip it can provide up to 40% additional aerodynamic lift essentially "for free". The hiller flying platform used this trick which is why it was able to have a useful range, almost half the lift was aerodynamic not just direct thrust from the ducted fan.
I know about the effect of the duct lip, however these small EDF units are still much less efficient than large diameter props/rotors. There is probably good reason the flight in the video lasted less than 3 minutes
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Old 08-28-2021, 09:10 AM   #9 (permalink)
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Not sure I could fly as quickly as he does, it's small and I'm old. I didn't see a camera but that doesn't mean there isn't one. The guy is definitely talented!
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Old 08-28-2021, 09:40 AM   #10 (permalink)
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Quote:
Originally Posted by Thoemse View Post
Probably flown FPV.
Nope, this guy is just really good at flying quads line of sight.
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Old 08-30-2021, 01:08 AM   #11 (permalink)
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The idea sounds cool, but in practice, that quad doesn't seem to perform as well other non-EDF quads.

He is very skilled at LOS flying quads like that. Not sure how the heck he manages to keep orientation! Super impressive. I've watched quite a few of his videos in the past.
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