HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Jan 26, 2011, 04:01 AM
Houng-wen Lin
GWS4CEO's Avatar
Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,445 Posts
Discussion
How many thrust that you able to get from GWS EDF75? 1.7+Kg

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?
GWS4CEO is offline Find More Posts by GWS4CEO
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 26, 2011, 04:06 AM
Houng-wen Lin
GWS4CEO's Avatar
Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,445 Posts
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?
GWS4CEO is offline Find More Posts by GWS4CEO
Reply With Quote
Old Jan 26, 2011, 04:42 AM
We want... Information!
Bruce Abbott's Avatar
Hastings, New Zealand
Joined Jan 2001
5,193 Posts
Quote:
Originally Posted by GWS4CEO View Post
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!).
Bruce Abbott is offline Find More Posts by Bruce Abbott
Reply With Quote
Old Jan 26, 2011, 05:03 AM
Houng-wen Lin
GWS4CEO's Avatar
Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,445 Posts
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?
GWS4CEO is offline Find More Posts by GWS4CEO
Reply With Quote
Old Jan 26, 2011, 05:06 AM
Houng-wen Lin
GWS4CEO's Avatar
Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,445 Posts
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.
GWS4CEO is offline Find More Posts by GWS4CEO
Reply With Quote
Old Jan 26, 2011, 10:37 PM
Houng-wen Lin
GWS4CEO's Avatar
Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,445 Posts
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?
GWS4CEO is offline Find More Posts by GWS4CEO
Reply With Quote
Old Jan 27, 2011, 03:09 AM
Houng-wen Lin
GWS4CEO's Avatar
Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,445 Posts
More test datas for your reference

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
GWS4CEO is offline Find More Posts by GWS4CEO
Reply With Quote
Old Jan 27, 2011, 09:07 AM
Registered User
Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
Joined May 2003
27,206 Posts
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).
Dr Kiwi is offline Find More Posts by Dr Kiwi
Last edited by Dr Kiwi; Jan 27, 2011 at 03:39 PM.
Reply With Quote
Old Jan 27, 2011, 03:36 PM
We want... Information!
Bruce Abbott's Avatar
Hastings, New Zealand
Joined Jan 2001
5,193 Posts
Quote:
Originally Posted by GWS4CEO View Post
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...
Bruce Abbott is offline Find More Posts by Bruce Abbott
Reply With Quote
Old Jan 27, 2011, 06:35 PM
Suspended Account
USA, NV, Caliente
Joined Mar 2009
1,163 Posts
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.
crypto666 is offline Find More Posts by crypto666
Reply With Quote
Old Jan 27, 2011, 08:32 PM
Registered User
Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
Joined May 2003
27,206 Posts
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.
Dr Kiwi is offline Find More Posts by Dr Kiwi
Reply With Quote
Old Feb 09, 2011, 02:46 AM
Houng-wen Lin
GWS4CEO's Avatar
Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,445 Posts
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!
GWS4CEO is offline Find More Posts by GWS4CEO
Reply With Quote
Old Feb 09, 2011, 02:48 AM
Houng-wen Lin
GWS4CEO's Avatar
Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,445 Posts
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?
GWS4CEO is offline Find More Posts by GWS4CEO
Reply With Quote
Old Feb 10, 2011, 01:21 PM
Suspended Account
USA, NV, Caliente
Joined Mar 2009
1,163 Posts
Quote:
Originally Posted by GWS4CEO View Post
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.
crypto666 is offline Find More Posts by crypto666
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion How many thrust that you able to get from GWS EDF75? GWS4CEO GWS (Grand Wing Servo) 0 Jan 25, 2011 07:44 PM
Question How many Micro RTFs did you get this year? jimjim06 Micro Ready-to-Fly 38 Dec 24, 2010 10:14 AM
Discussion Boca Bearings any Good? How many flights can you get out of one? pitchp Mini Helis 13 Oct 03, 2010 08:45 PM
Discussion How many thrust that you get from GWS EDF50? GWS4CEO Power Systems 17 Dec 29, 2009 09:40 PM
How many GWS slow fly propllers that you recognized? GWS4CEO Parkflyers 17 Oct 10, 2001 02:50 PM