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why are edfs expensive?

May. 06, 2024

why are edfs expensive?

An EDF is not just a rather high power high revving motor and thus sold in relatively small numbers but has to include two high quality injection mouldings, the fan and the body, as well as assembly and in many cases this is followed by a balancing process so it runs smoothly.
Looked at like this it is not surprising that an EDF is more expensive than a basic motor.

Most EDFs are heavy and fast and use very powerful battery setups but as Fopster points out if you build as a "light weight" there are ways to create a "jet" airframe and in certain cases without actually buying an EDF as such.
This standoff scale Douglas Skyray certainly looks like an EDF but light and built out of sheet foam.

it is powered by a readily available & cheap racing drone motor driving a 3x4.5 three blade prop inside the fuselage.

It only needs a 1500 mAh 3s LiPo. It weighs 430g (15 oz) ready to go.
Takes a bit of ingenuity but it flies. An easy hand launch and at a true scale speed too!

F-35loverAn EDF is not just a rather high power high revving motor and thus sold in relatively small numbers but has to include two high quality injection mouldings, the fan and the body, as well as assembly and in many cases this is followed by a balancing process so it runs smoothly.Looked at like this it is not surprising that an EDF is more expensive than a basic motor.Most EDFs are heavy and fast and use very powerful battery setups but as Fopster points out if you build as a "light weight" there are ways to create a "jet" airframe and in certain cases without actually buying an EDF as such.This standoff scale Douglas Skyray certainly looks like an EDF but light and built out of sheet foam.it is powered by a readily available & cheap racing drone motor driving a 3x4.5 three blade prop inside the fuselage.It only needs a 1500 mAh 3s LiPo. It weighs 430g (15 oz) ready to go.Takes a bit of ingenuity but it flies. An easy hand launch and at a true scale speed too!

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Computer fan as a drone motor.

laisut:
Hi, i saw on Ebay that actual drone motors cost very much. As i am building a drone completely from scratch , i would like to use some life hacks e.g. turning pc fans into motors. Are there any people with that kind of experience that could point me to some direction ? What size of propellers to use, what fans to use?

They are very cheap, not very expensive. An industrial rated version would be $100 or more.

You cannot possibly substitute a fan motor and get anything like the power/weight ratio of a decent
RC brushless motor. Remember you need a lot of power to hover (much much more than to
fly a plane), and your motors have to hold up the weight of everything, battery, frame, electronics
as well as themselves, and have a comfortable performance margin (x3 or so) for manoevring.

For more drone thrustinformation, please contact us. We will provide professional answers.

That video shows the motors can barely lift themselves alone, certainly without a margin of performance.

One of the things that RC brushless motors have over fan motors is that they use NdFeB
magnets which are much stronger than the ferrite magnets used in fan motors.

Ever wondered why quadcopters didn't exist before neodymium magnet motors and LiPo
batteries were available? Because you need that power density. A quad can use 50 to 200W
just to stay in the air.

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