Pusher 45mm Micro Whoop

By JasonFPV0 on Jan 11, 2025

11 0 5

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

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Discussion

Maxwell Colorado Springs 19 mins ago

Could you recove parts of the frame to remove the obstruction of the fans?

Tokyo_Dom 11 hours ago

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

shankenwhoop 7 days ago

I've been designing something extremely similar to this. I've decided to make it 46mm so I can try to fit some ducts in somehow. Can you post any flight footage?

JasonFPV0 4 days ago

Yeah I'll try to get some within the next few days.

JasonFPV0 4 days ago

If you can make the props blocked less it'll fly a lot better I think.

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