GWS EDF40 with GWS BL2018 motor can give you 444g thrust!!!

GWS4CEO · Apr 11, 2008, 03:58 AM

It's sound crazy?

But I am so happy to get the test datas by myself: GWS EDF40 with GWS BL2018 motor can give you 444g thrust, at 4 cells took 24.7Amps.

Now, we can think how to make more small JETs!

For long time that I was suffered could not get better out put from my small EDFs due to motors not match right!

I am happy now, eventually, new GWS BL2018 motor work great to match with GWS EDF40!

GWS4CEO · Apr 11, 2008, 04:02 AM

In case of you had others motors which performed even better than GWS BL2018?

Would you like to shared your datas!

Dr Kiwi · Apr 11, 2008, 07:39 AM

How do you get the push-fit impeller to stay on the shaft at almost 350W? What rpm does that EDF 40 impeller spin at to get 444g? What is the Kv of this 2018 motor?

I know a 12mm Medusa needs 48,500rpm to get 160g.

GWS4CEO · Apr 13, 2008, 10:14 PM

mike3976 · Apr 13, 2008, 11:53 PM

A 40mm EDF, pulling 25 amps @ 15 volts, and making 15&2/3oz. thrust is really nothing to toot your horn about!

CORRECTED 15&5/8 TO 152/3 as in 15.66, Details, Details

Bruce Abbott · Apr 14, 2008, 05:39 AM

Seriously, have you seen an EDF40? To get 444g thrust that little polystyrene rotor has to be doing over 75000rpm

Quote:

Originally Posted by Dr Kiwi

What is the Kv of this 2018 motor?

Kv? We ain't got no Kv. We don't need no Kv! I don't have to show you any stinkin' Kv!

KenSt · Apr 14, 2008, 09:45 AM

Does the present design of the rotor and the ribs in the hub in particular support this kind of RPM? I had to machine an insert for my EDF 55 rotor to prevent uneven expansion.

Dr Kiwi · Apr 14, 2008, 10:12 AM

Quote:

Originally Posted by Bruce Abbott

Seriously, have you seen an EDF40? To get 444g thrust that little polystyrene rotor has to be doing over 75000rpm

Kv? We ain't got no Kv. We don't need no Kv! I don't have to show you any stinkin' Kv!

One can only assume that the motor must be about 6000Kv to get 75,000rpm under load from 14.7v.

We don't need to post our impeller rpm either! Otherwise people could see through the cloud of "Pixie Dust".

KenSt · Apr 15, 2008, 12:41 PM

I agree, it would be a vast improvement if ALL GWS data included RPM.

Jeffbrook · Apr 15, 2008, 11:30 PM

I would like to see an extra long can 12mm diameter brushless motor for use with the 40 and 50 edf. By extra long, I mean something greater than 30 mm. Some extra length would buy us more torque to spin the 40 and 50 fans to higher rpms. Currently, many of us are pushing our 12x30mm motors to the limit and beyond. The reason many of us we are doing this is to avoid the weight penalty of a 20 mm motor. Looking at the 40 and 50 gws fans, I also think that an extra long 12mm motor would disrupt the airflow less than a 20 mm motor and could perhaps be more efficient because it wouldn't have to be pushed as hard - ie generating a lot of heat. However - 444 grams of thrust with a 20 mm motor in a 40mm fan set up is impressive no matter how you look at it.

What kind of adapter was used to attach the 40mm fan to the motor? Was the fan made from a different material (more glass in the resin)? To kick out 444 grams of thrust, as mentioned above, would require some impressive rpms.

Jeffbrook · Apr 16, 2008, 08:02 AM

Looks like Feigeo has an extra long can 12mm motor (30+ mm long).

Is it for sale anywhere? I know they now have some high kv 12mm dia motors (7500 kv). Where are the "super long can" motors? Longer motor can = more torque without as much weight penalty by going to a 20 mm dia. motor.

Dr Kiwi · Apr 16, 2008, 08:35 AM

I too had been puzzled as to how a 20mm motor could be made to fit those EDF 40 and EDF 50 housings. Boring the impeller hub out (extremely accurately) to suit the 2mm motor shaft (rather than the standard 1.5mm) would be a considerable challenge.

Megowcoupe · Apr 16, 2008, 09:58 AM

Mr. Lin

A couple of thoughts from a modeler who often does things off the beaten path.

I've used a GWS EDF 40 fan along with a Feigao 12 mm motor and been quite happy with the results in a little Fantastic Models Skyray. However, this airplane had ready access to the fan.

In my newest EDF- an Avro Arrow- there is no access to the Vipertec fan I chose. Had a 200 watt GWS EDF 40 fan been available, I certainly would have considered it- but please let me note my areas of concern-

1) Durability
2) Maintenance requirements
3) Performance
4) Installation

I too will echo the concerns of several folks here about the press fit mounting system currently in use. For a fan which is not readily accessible, this system does not fill me with confidence.

My current GWS EDF 40 fan has needed to be replaced after several dozen flights. I'm not complaining- the fan has given yeoman service through several mishaps.

Also- while the GWS EDF 40 fan seems to work very well in a lightweight airplane (under 200 grams or so), these aircraft require more modest power levels-typically less than 100 watts.

For a 200 watt airplane, I would first consider a Wemotec Microfan- however, there are some installations where the Microfan is simply too big. Hence, I could certainly see some applications for a 200 watt plus 40 mm fan. However, this fan would need to be more robust than the existing 40 mm fan.

Sam Brauer
Stamford, CT

GWS4CEO · Apr 18, 2008, 11:02 AM

Quote:

Originally Posted by Dr Kiwi

I too had been puzzled as to how a 20mm motor could be made to fit those EDF 40 and EDF 50 housings. Boring the impeller hub out (extremely accurately) to suit the 2mm motor shaft (rather than the standard 1.5mm) would be a considerable challenge.

Will modify the motor mount for 20mm motor.

Rotor blade center will be also modify to 2 or 3mm. So far expriment by 2mm.

Dr Kiwi · Apr 18, 2008, 12:12 PM

If this is for 200-400W it seems imperative that the rotor be carbon fiber reinforced and held by a collet adapter (push fit is a no, no!).

Apr 11, 2008, 03:58 AM	#1
GWS4CEO Houng-wen Lin Join Date: Sep 2001 Location: Shijr, Taiwan. DungGwan, China. City of Industry, California. Posts: 18,200	GWS EDF40 with GWS BL2018 motor can give you 444g thrust!!! It's sound crazy? But I am so happy to get the test datas by myself: GWS EDF40 with GWS BL2018 motor can give you 444g thrust, at 4 cells took 24.7Amps. Now, we can think how to make more small JETs! For long time that I was suffered could not get better out put from my small EDFs due to motors not match right! I am happy now, eventually, new GWS BL2018 motor work great to match with GWS EDF40! Attached Thumbnails 8.1 KB · Views: 147

Apr 13, 2008, 11:53 PM	#5
mike3976 Same Day Delivery Join Date: Mar 2002 Location: Economy, Pa. Posts: 3,068	A 40mm EDF, pulling 25 amps @ 15 volts, and making 15&2/3oz. thrust is really nothing to toot your horn about! CORRECTED 15&5/8 TO 152/3 as in 15.66, Details, Details Last edited by mike3976; Apr 14, 2008 at 10:20 AM.

Apr 16, 2008, 08:02 AM	#11
Jeffbrook Registered User Join Date: May 2005 Posts: 38	Looks like Feigeo has an extra long can 12mm motor (30+ mm long). Is it for sale anywhere? I know they now have some high kv 12mm dia motors (7500 kv). Where are the "super long can" motors? Longer motor can = more torque without as much weight penalty by going to a 20 mm dia. motor. Attached Thumbnails 43.4 KB · Views: 72

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Apr 11, 2008, 04:02 AM	#2
GWS4CEO Houng-wen Lin Join Date: Sep 2001 Location: Shijr, Taiwan. DungGwan, China. City of Industry, California. Posts: 18,200	In case of you had others motors which performed even better than GWS BL2018? Would you like to shared your datas!

Apr 11, 2008, 07:39 AM	#3
Dr Kiwi Registered User Join Date: May 2003 Location: Chattanooga, Tennessee, United States Posts: 19,922	How do you get the push-fit impeller to stay on the shaft at almost 350W? What rpm does that EDF 40 impeller spin at to get 444g? What is the Kv of this 2018 motor? I know a 12mm Medusa needs 48,500rpm to get 160g.

Apr 13, 2008, 10:14 PM	#4
GWS4CEO Houng-wen Lin Join Date: Sep 2001 Location: Shijr, Taiwan. DungGwan, China. City of Industry, California. Posts: 18,200

Apr 14, 2008, 09:45 AM	#7
KenSt Scratch builder Join Date: Apr 2004 Location: Telford, Pa., United States Posts: 985	Does the present design of the rotor and the ribs in the hub in particular support this kind of RPM? I had to machine an insert for my EDF 55 rotor to prevent uneven expansion.

Apr 15, 2008, 12:41 PM	#9
KenSt Scratch builder Join Date: Apr 2004 Location: Telford, Pa., United States Posts: 985	I agree, it would be a vast improvement if ALL GWS data included RPM.

Apr 15, 2008, 11:30 PM	#10
Jeffbrook Registered User Join Date: May 2005 Posts: 38	I would like to see an extra long can 12mm diameter brushless motor for use with the 40 and 50 edf. By extra long, I mean something greater than 30 mm. Some extra length would buy us more torque to spin the 40 and 50 fans to higher rpms. Currently, many of us are pushing our 12x30mm motors to the limit and beyond. The reason many of us we are doing this is to avoid the weight penalty of a 20 mm motor. Looking at the 40 and 50 gws fans, I also think that an extra long 12mm motor would disrupt the airflow less than a 20 mm motor and could perhaps be more efficient because it wouldn't have to be pushed as hard - ie generating a lot of heat. However - 444 grams of thrust with a 20 mm motor in a 40mm fan set up is impressive no matter how you look at it. What kind of adapter was used to attach the 40mm fan to the motor? Was the fan made from a different material (more glass in the resin)? To kick out 444 grams of thrust, as mentioned above, would require some impressive rpms.

Apr 16, 2008, 08:35 AM	#12
Dr Kiwi Registered User Join Date: May 2003 Location: Chattanooga, Tennessee, United States Posts: 19,922	I too had been puzzled as to how a 20mm motor could be made to fit those EDF 40 and EDF 50 housings. Boring the impeller hub out (extremely accurately) to suit the 2mm motor shaft (rather than the standard 1.5mm) would be a considerable challenge.

Apr 16, 2008, 09:58 AM	#13
Megowcoupe Balsa Flies Better! Join Date: Oct 2000 Location: Stamford, CT Posts: 5,538	Mr. Lin A couple of thoughts from a modeler who often does things off the beaten path. I've used a GWS EDF 40 fan along with a Feigao 12 mm motor and been quite happy with the results in a little Fantastic Models Skyray. However, this airplane had ready access to the fan. In my newest EDF- an Avro Arrow- there is no access to the Vipertec fan I chose. Had a 200 watt GWS EDF 40 fan been available, I certainly would have considered it- but please let me note my areas of concern- 1) Durability 2) Maintenance requirements 3) Performance 4) Installation I too will echo the concerns of several folks here about the press fit mounting system currently in use. For a fan which is not readily accessible, this system does not fill me with confidence. My current GWS EDF 40 fan has needed to be replaced after several dozen flights. I'm not complaining- the fan has given yeoman service through several mishaps. Also- while the GWS EDF 40 fan seems to work very well in a lightweight airplane (under 200 grams or so), these aircraft require more modest power levels-typically less than 100 watts. For a 200 watt airplane, I would first consider a Wemotec Microfan- however, there are some installations where the Microfan is simply too big. Hence, I could certainly see some applications for a 200 watt plus 40 mm fan. However, this fan would need to be more robust than the existing 40 mm fan. Sam Brauer Stamford, CT

Apr 18, 2008, 12:12 PM	#15
Dr Kiwi Registered User Join Date: May 2003 Location: Chattanooga, Tennessee, United States Posts: 19,922	If this is for 200-400W it seems imperative that the rotor be carbon fiber reinforced and held by a collet adapter (push fit is a no, no!).