Just because you can doesn't mean you should.
Frame File: https://www.thingiverse.com/thing:6908198/files
Through a set of abhorrent design choices and mistakes, the quad is now running on two 0603s and two 0802s. Don't ask. Oh and the usb port disappeared. I haven't even had this aio out of the box for a full 12 hours yet.
18.2g Dry
I lowered a few values on Chris Rosser's AOS tune preset and the tune actually feels pretty good all things considered.
Is it cool? Yes.
Do I recommend it? No. Fairly short flight times and very poor accelleration despite pretty good top speed.
Yes its a pusher. Yes it takes off from its propellers. Yes it's a little bit of a pain.
I did it that way because I've heard you lose a lot more power obstructing the high pressure zone under the prop than the low pressure zone above it. When it stops snowing I'm going to test it's huckability outside. Because of the lack of ducts, I think this is going to be more of an outside quad.
Photos
Part List
Frame |
45mm Pusher Frame F3D File by JasonFPV
Thingiverse.com
|
See Site |
Flight Controller |
BetaFPV Air Brushless Flight Controller 5-in-1 AIO ELRS 2.4G 400mw VTX
(3 builds)
Pyrodrone.com
|
$49.99 |
Motors |
4 x HappyModel SE 0802 19000Kv Micro Motor
Racedayquads.com
|
$35.96 |
Prop obstruction is going to be an issue no matter which way you do it at this size. My little 46mm quad actually has as little as possible but its still less efficient than a regular 65mm whoop.
As for aerodynamics, its actually the other way around, at least that is the info i can find online. Air under the prop is dirty already so obstructing it more wont have as much of an effect as obstructing it on the "clean" side. But it should be fairly easy to confirm this on your build, just check the hover current, flip the props and remap motors/flip gyro in betaflight and check the hover current flying the other way around (my quad doesnt run bluejay, or have a current meter...) . You can just hover it LOS because the camera will be upside down lol
Yeah we always think of props as "pushing" us forward, but it is "sucking" just as much as it is pushing. Thats why it can still punch out in the middle of the air where there is nothing to push against. Then, aerodynamically, the props are not just angled screws, they are also airfoils which work the same as any wing, generating lift via the greater distance that the air travels on the top of the blade. But that air will only do that if its clean (not turbulenced). And thats where keeping the air in front of the prop as clean as possible leads to efficiency gains. Or thats what the theory says, and how it works for larger props (airplanes).
But i did actually try flipping one of my whoops, and saw lower hover current.... This sort of throws my understanding on its head... Pun somewhat intended.
Guides & Reviews
AirbladeUAV has done it again and this time they've brought long range to the 5" class! Based on the popular Transformer Mini, the new Transformer 5" Ultralight adopts a lot of the same design philosophies with larger props and more payload capacity. It can fly upwards of 20 minutes on a 4 cell Li-Ion battery pack and in ideal conditions it's got a range of over 4 to 5 miles. In this guide I'll walk..
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With the release of the DJI FPV Drone cinematic FPV has become a lot more accessible, but you certainly don't want to crash a $750 drone! The QAV-CINE Freybott is a compact, lightweight cinematic FPV drone that can take a hit and keep going. It's a lot safer to fly indoors and around people. With a naked GoPro or the SMO 4k you can capture some great stabilized footage. In this guide I'll show you..
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This thing is an abomination and I think it's great. What a mess.