Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Ducted Fan

by Stuey, published

Ducted Fan by Stuey Dec 2, 2012
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This is the first stage of a ducted fan engine that i will be building


Simply add supports and print. There is a 3.15 mm centre hole for an electric motor. I have left a 2mm hole right through in order to secure with a grub screw from both sides.

I will release all of the other parts as soon as I know that they work.

Please feel free to edit and make this thing better.

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I like your fan, but may I offer a design change to make this thing highly efficient?
The venturi is also a nice design!

Nevermind, I just saw that hoverhead addressed the issue as far as efficiency goes. I just din't want to give my input without asking as I am sure you put quite a bit of time and effort into this thing. I don't like knocking people down, but would rather help them out.

Also Stuey, just to shed some light on why the design should be changed F.Y.I. , the tallest part of the fan blade is pitched in such a way it is meant to push air outward, more so than passing it through. This sharp pitch near the hub that pushes the air out-word allows it to collide/combine with the air that is being pushed through the fan at the ends of the blade (nearest the housing) where you have more velocity of the blade itself, in turn giving the prop more efficiency with compression which is what you want, especially with a venturi. Efficiency is key when incorporating a venturi since it forms a pressure chamber. If this fan blade is not designed correctly you may even get better results as far as thrust goes without the venturi or narrowed exhaust porting. It greatly depends on rpm's as well as number of blades and their pitch, also the blade to housing clearances. Once you reverse the curve of the blades as well as operating rotation, try it out without the narrowed exhaust porting. If you get better results, you can incorporate a solid ring around the entire prop and do away with all of the housing, with exception of the motor mounting section of course. One more thing.....make the cutting edge of the blades as narrow as possible to minimize as much resistance and or turbulence as possible. Hope this help you out bud, you got the C.A.D. part down to a tee!

Hi thanks for the pleasant comments and I'll take it all on board. I would be interested to see the changes you'll make. I spent about 1 hour on this after learning CAD for about a month so I kinda just wanted to publish something and see if I could draw it.
Still learning today as I don't get a massive amount of time to spend on it.

But thanks again for your comments, I may draw another one soon

Kind regards


Thank you, Nice pusher fan.

Blade are back to front. They need to be mirrored to spin in this direction or rotated so the fan spins the other direction. Why is the duct shaped like an exhaust nozzle?

To give more velocity to the air passing through, it's call a venturi.

Hi, I do, will try and post them over the weekend.

do you have the cad files?

Just made one. I uploaded the photo. Came out pretty nice. Improvements could be made, but i can get quite a bit of power out of it.

The baldes are designed to turn clockwise as a lot of motors have skightly more power in this direction. This is the first fan that I have designed with CAD so it is all up for interpritation and new devivatives.

Is it just me or are the fan blades inverted?

Did you try to print this thing? (If not, tell you it's not an easy task to make it).

Yes, just printed it, came out well after a couple of false starts. Will post pics.