Pls check GWS EDF75 datas here:
http://www.gwsus.com/english/product...stem/edf75.htm



Also with today's new brushless motors, the out put thrust is by far much more than before! From 200~300g up to over 1.7+Kg now!

I like to tell you how GWS EDF75 recently had tested with proto type brushless outrunner motor to get such result:

EDF75 4 blades: 1728g at 5 cells 81A ( 1498W ) 3260KV 1.15g per Watt.

EDF75 4 blades: 1180g at 4 cells 50.2A ( 743W ) KV=? 1.46g per Watt.

Any one here may be even already got better test datas when to be with other motors?

Some time ago, we also got those datas:

BL2825(Blue) EDF-75X4 ( with air intake )
Volts (v) Amps (A) Thrust=g Power (w) Efficiency

with intake ring A 11.1 36.6 800g 28.22 406.26W 1.97 69.45
with intake ring B 11.1 36.1 792g 27.93 400.71W 1.98 69.71
with intake ring A 14.8 54.7 1260g 44.44 809.56W 1.56 54.89
with intake ring B 14.8 54.1 1218g 42.96 800.68W 1.52 53.65

I wish that we can hear your test datas even better then this?

Originally Posted by GWS4CEO

EDF75 4 blades: 1728g at 5 cells 81A ( 1498W ) 3260KV 1.15g per Watt.

Do you have rpm data for this?

According to my calculations it must spin at ~47000rpm to get 1728g thrust. I am surprised that those thin polystyrene impeller blades can handle it (I have not dared to push an EDF75 anywhere near this hard!).

You need to break in slowly...

Increase RPM very small steps, thinking break in an ABC engine!

I will keep trying how many thrust will kill GWS EDF75?

The intake ring did increase a lot of thrust.



In case of that you have enough space to add on intake ring, pls add on and find the magic effect!

BL2825(Blue) without air intake
Volts (v) Amps (A) Thrust Power (w) Efficiency

EP3045x4 11.1 34.7 731 25.78 385.17 1.90 66.94
EP3043x6 11.1 37.5 714 25.18 416.25 1.72 60.50
EP3045x4 14.8 52.4 1140 40.21 775.52 1.47 51.85
EP3043x6 14.8 58.4 1108 39.08 864.32 1.28 45.21

You can see the difference when run without intake ring, by far less than with it.

By the way, if you don't want to spend too much cost of battery watts?

Try to use them at 4 cells:
EDF75 4 blades: 1246g at 4 cells 57.8A ( 855.44W ) 3260KV


Another proto type motor that was measured:
EDF75 4 blades: 1180g at 4 cells 50.2A ( 742.96W )

Which one you like it better?

BL2825(Red) EDF-75X4 ( with air intake )
Volts (v) Amps (A) Thrust Power (w) Efficiency=g/W
with intake ring A 11.1 82.3A 1280g 45.15oz 913.53W 1.40 49.42oz/KW
with intake ring B 11.1 81.6A 1240g 43.73oz 905.76W 1.37 48.29oz/KW

BL2825(Red) EDF-75X6 ( with air intake )
Volts (v) Amps (A) Thrust=g; oz Power (w) Efficiency=g/W
with intake ring A 11.1 85.8A 1250g 44.09oz 952.38W 1.31 46.29oz/KW
with intake ring B 11.1 84.1A 1210g 42.68oz 933.51W 1.30 45.72oz/KW

BL2815(Red) without air intake
Volts (v) Amps (A) Thrust Power (w) Efficiency
EP3045x4 11.1 45.4 832 29.34 503.94 1.65 58.23
EP3043x6 11.1 44.8 811 28.60 497.28 1.63 57.52

BL2815(Red) EDF-75X4 ( with air intake )
Volts (v) Amps (A) Thrust Power (w) Efficiency
with intake ring A 11.1 46.7 960 33.86 518.37 1.85 65.32
with intake ring B 11.1 45.6 954 33.65 506.16 1.88 66.48

BL2815(Red) EDF-75X6 ( with air intake )
Volts (v) Amps (A) Thrust Power (w) Efficiency
with intake ring A 11.1 45.8 951 33.54 508.38 1.87 65.98
with intake ring B 11.1 45.0 943 33.26 499.50 1.89 66.59

BL2825(Blue) without air intake
Volts (v) Amps (A) Thrust Power (w) Efficiency
EP3045x4 11.1 34.7 731 25.78 385.17 1.90 66.94
EP3043x6 11.1 37.5 714 25.18 416.25 1.72 60.50
EP3045x4 14.8 52.4 1140 40.21 775.52 1.47 51.85
EP3043x6 14.8 58.4 1108 39.08 864.32 1.28 45.21

BL2825(Blue) EDF-75X4 ( with air intake )
Volts (v) Amps (A) Thrust Power (w) Efficiency
with intake ring A 11.1 36.6 800 28.22 406.26 1.97 69.45
with intake ring B 11.1 36.1 792 27.93 400.71 1.98 69.71
with intake ring A 14.8 54.7 1260 44.44 809.56 1.56 54.89
with intake ring B 14.8 54.1 1218 42.96 800.68 1.52 53.65

BL2825(Blue) EDF-75X6 ( with air intake )
Volts (v) Amps (A) Thrust Power (w) Efficiency
with intake ring A 11.1 37.7 780 27.51 478.47 1.86 65.74
with intake ring B 11.1 37.1 775 27.33 411.81 1.88 66.38
with intake ring A 14.8 58.9 1240 43.73 871.72 1.42 50.17
with intake ring B 14.8 57.8 1210 42.68 855.44 1.41 49.89

In your first post you present data using a "prototype outrunner" motor [can you share the details?]. All the other data you have given in the posts #2, #5, #7 are from inrunner motors.... so that they are not directly comparable.

As mentioned we'd like to see RPM so that we can determine how well the motors are spinning the impellers. Figures of below 1.6g/W don't seem particularly good for a large diameter fan like this (75mm).

Originally Posted by GWS4CEO

Try to use them at 4 cells:
EDF75 4 blades: 1246g at 4 cells 57.8A ( 855.44W ) 3260KV


Another pro to type motor that was measured:
EDF75 4 blades: 1180g at 4 cells 50.2A ( 742.96W )

Which one you like it better?

I like the other "pro to type motor" better, as it seems to have significantly lower power consumption and higher efficiency (75% vs 71%), for almost the same thrust.

However your figures seem to be a bit too accurate. 855.44W/57.8A and 742.96W/50.2A both work out to exactly 14.8V, but I doubt that you were able to hold the voltage that steady. What were the actual voltages?


Some rpm readings would also help...

Aside from all else, I for one really appreciate manufactures who share their data and ask for the opinions of their customers.

That seems like good business.

I agree... it is great that Hu is providing data for us.....if we have these base data, we can then test the same systems independently, and hopefully get the same results.

With too many manufacturers, so few data are provided that it is "a pig in a poke", and you are on your own from the outset.

A funny thing that I have seen in China:

A maker copy AP-700, claim thrust 1.2Kg ( guess also copy from AP said on their box ), while I put that EDF unit into my system to test. :

I only get less than 800g in our way on that 1.2Kg product!

I wounder, what will be the truth of the datas of those copy clones? How they maesure? or they just copy every thing, include datas from original maker said?

What will be the right standard to test and measure?

Any detail of links?

Originally Posted by GWS4CEO

A funny thing that I have seen in China:

A maker copy AP-700, claim thrust 1.2Kg ( guess also copy from AP said on their box ), while I put that EDF unit into my system to test. :

I only get less than 800g in our way on that 1.2Kg product!

Well, I can relate. I bought brand name edf that advertised a 1.7kg thrust output, but when I test it at my altitude I get 1.4kg max. I don't think I was being mislead, but I was suprised at the amount of loss at my altitude of 5300' (~1600m) ASL.


One thing I see too often is testing is done at varying atmospheric conditions. That needs to be standardized, which would limit testing to sea level locations.

FYI; I have put together a 76mm edf for 8s operation. I am currently getting 1.8kg thrust at ~1400W (51A). 1.29g/w @ 1600m ASL (above sea level) However, it is using a bigger motor that weighs more so in the end it probably works out to about the same as your fans.