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Brushless beecheese frame (Semi ducted micro brushless frame)

by Noctaro Sep 19, 2017
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Nice design for a micro brushless.

The ducted props have increased efficiency by reducing loss of thrust from the propeller tips. Holes in the duct negate the efficiency... results in just a heavier frame and nice prop guards. :-)

Could try scalloped lower edge (want to keep top edge solid for better airflow) to reduce weight, just keep the plane of the propeller a solid band. See the GE motors on the 777.

I agree with this. A solid surface very closely wrapped around the prop ends causes the "ducting" efficiency. Holes in the walls of the duct negate the improvement to airflow. If you're going for ducts, get rid of the holes. If you're going for prop guards, get rid of most of the extra weight of the duct.

Hmmm, I am not sure about, but i think the semiducted style still does some dirty air management. As said, duct efficiency is in most cases not given on a quadcopter. There might be better way of creating prop guards, but anyhow, i like this semiducted style. :)

But i get your point. I could make this frame more efficient by reducing the ducts. This would also sacrifice some rigidity i think.

Hey! Thanks for your comment. I guess you dont want ducts on a copter. They are efficient at jets. Or something that is just hovering. But on a quadcopter they will counter your forwards move and make you more volunereable against the wind. If you are a pro racer and fly your machine around a 90° angle, ducts become more efficient again i think.

You are right, my version of ducts is more propguard then duct.

Here is some theory

Awesome! Looking forward to your print! Do you intend to print the standoffs without raft?

Definitely going to print this in the coming days - the standoffs will be a good benchmark for the new printer :-D