Twin EDF55 SU47 [Archive]

X-flight

Sep 05, 2005, 09:48 AM

X-flight

Sep 05, 2005, 09:51 AM

Photo 1

X-flight

Sep 05, 2005, 10:00 AM

Photo2, 3 and 4.

The length of the SU47 is 1260 mm, Wing span 1020mm, flying weight is 1260g, powered by a set of 3S2P 2200mah 15c batteries

X-flight

Sep 05, 2005, 11:01 AM

Here is the maiden video yesterday.

This is a trial version we wish to test the flying charateristic of the plane.

It was hand launched and can glide very good, therefore it can definately be loaded a few more hundreds of gram.

http://gg13.no-ip.com:8000/x-flight/su47.wmv

AirX

Sep 05, 2005, 01:26 PM

X-flight,

Ni Hao, welcome to the RCGroups Jets forum. I see you fly with T-T and you guys have a very nice flying site. Very nice plane and if you can give us more information about the 2040-4800kv motor it wold be apreciated. With most fans over 50mm the 20mm motor is a bit challenged to make develop the mechanical force (troque) needed to spin 55-65mm fans to any decent performcance and still survive the byproduct heat they produce and so longer is the only way to get them to produce the torque needed.

Cheers,

Eric B.

SX_

Sep 05, 2005, 03:56 PM

that is awsome~~~!!!!!!
i want 2!!

X-flight

Sep 05, 2005, 07:15 PM

AirX

Ni Hao

The motor we are using has built in-eat sink that helps a lot.

We spin the GWS EDF55 with this 2040 4800kv motor, it gives almost 600g :eek: of thrust. however, after we installed into the SU47, the friction of the duct reduced the thrust almost 10 to 15% since the ducts are very long :( . I forgot to take the temperature after the maiden, however, it was not hot at all when we were testing the fan on ground before we installed the fan into the plane.

The GWS need a minor enhancement before it can sustain the power output without fly out from the shaft.

Our wedsite will start to work very soon, then you can see how the motor look like.

We also tried another motor on GWS EDF55 for GWSA10, They were two 2030 type of motors with very good result too. :D

X-flight

Sep 05, 2005, 07:24 PM

that is awsome~~~!!!!!!
i want 2!!

SX

Thanks.

The plane is a beta version. It still need a lot of enhancement, we planned to put a better fan, may be wemotec Midi, in it.

At this moment, the plane is 100% to scale :D ie, the intake ducts are not being enlarged. But if we are going to install the Midi fan, we need to enlarge the intake ducts which our desiger hate to do so. :mad:

If you are really interested, please PM me.

AirX

Sep 05, 2005, 07:47 PM

X-flight,

Ni Hao,
Nice to have you a part of the forum. The 10%-15% losses are not the ducting irregularities itself although some can be attribute(2%-3%) to that but to a constant diameter of the outlet. Use a tapered outlet to 80% of the fan diamter and you will recover the loast velocity.

The plane is spectacular and hope to see the website for the motor up very soon, please post the address when it is available.

Zai Jian,

Eric B.

AirX

Ni Hao

The motor we are using has built in-eat sink that helps a lot.

We spin the GWS EDF55 with this 2040 4800kv motor, it gives almost 600g :eek: of thrust. however, after we installed into the SU47, the friction of the duct reduced the thrust almost 10 to 15% since the ducts are very long :( . I forgot to take the temperature after the maiden, however, it was not hot at all when we were testing the fan on ground before we installed the fan into the plane.

The GWS need a minor enhancement before it can sustain the power output without fly out from the shaft.

Our wedsite will start to work very soon, then you can see how the motor look like.

We also tried another motor on GWS EDF55 for GWSA10, They were two 2030 type of motors with very good result too. :D

ASSAN

Sep 05, 2005, 09:35 PM

one ESC or two ESC?

Ernest

Sep 05, 2005, 11:56 PM

Hello

We are a team of electric flight enthusiast based in Hong Kong.

One of our memeber recently built a SU47, it was maidened sucessfully yesterday.

The SU47 is cut from foam by hotwire in sections and join together. The wings are constructed from hot-wire cut foam core and warp by 1mm depron.

It si powered by two GWS EDF55, with 2 2040 type 4800KV bushless motors.

Wow, Its very nice and scale..
Infact I am building one at the moment, powered by 1 wemotec 480 with Het 2w20(700watt) motor and 4s1p ..
Now flying weight is about 1200g (Not yet maiden) .. extra weight is due to retracts and doors..
Have not measure the thrust yet.. i am not sure if is enough..
Any comment?

netmechanic

Sep 06, 2005, 02:16 AM

If your single 4S battery can handle 48-50 amps then you'll be crankin out 700+ watts out of that motor. With over 200 watts/lb you should be OK power wise. Hope the wings can take it.

Paul DF jet man

Sep 06, 2005, 02:24 AM

those are both VERY nice jet, well done :-)

love the retract doors.

X-flight

Sep 06, 2005, 08:58 AM

Wow, Its very nice and scale..
Infact I am building one at the moment, powered by 1 wemotec 480 with Het 2w20(700watt) motor and 4s1p ..
Now flying weight is about 1200g (Not yet maiden) .. extra weight is due to retracts and doors..
Have not measure the thrust yet.. i am not sure if is enough..
Any comment?

Yes, Ernest.

The 700W minfan and HET2W20 is also one of my considerations. However, I don't have much information of how this combination perform. Our SU47 is so large that I think it need more thrust than speed.

Did you maidened your? How it performed?. If it is good, I think our designer will be very happy because he can retain the scale of the plane.

Regards

X-flight

X-flight

Sep 06, 2005, 09:01 AM

The building photos.

X-flight

Sep 06, 2005, 09:03 AM

one ESC or two ESC?

Assan

Hi, two esc, of course.

X-flight

Sep 06, 2005, 09:04 AM

More building photos

X-flight

Sep 06, 2005, 09:09 AM

The motor.

Rane

Sep 06, 2005, 09:40 AM

Awesome X-flight.. :)

Absolutely fine plane SU-47.

What kind of control system canard wing you do?

-Rane

X-flight

Sep 06, 2005, 10:46 AM

Awesome X-flight.. :)

Absolutely fine plane SU-47.

What kind of control system canard wing you do?

-Rane

Rane

For test flight, the front canard are mechanically link with the rear stabliser. Two servos are used. one on each side. The moving angle of the fron canards are less than the rear.

In the future, we may try to control the front canard independently.

X-flight

Ernest

Sep 07, 2005, 11:54 AM

Yes, Ernest.

The 700W minfan and HET2W20 is also one of my considerations. However, I don't have much information of how this combination perform. Our SU47 is so large that I think it need more thrust than speed.

Did you maidened your? How it performed?. If it is good, I think our designer will be very happy because he can retain the scale of the plane.

Regards

X-flight

Hi X-flight,
I have not maiden it yet as now still sorting out the control system and glassing part, think it will be ready in about a week time.. :D
Its a really cool jet indeed..

bobthenuke

Sep 07, 2005, 02:49 PM

X-flight,

Very cool (and challenging) project. Can you tell us what kind of retracts you're using?

...bob

X-flight

Sep 08, 2005, 09:26 AM

X-flight,

Very cool (and challenging) project. Can you tell us what kind of retracts you're using?

...bob

Bob

Thanks

We did not use any retracts during the maiden, we just used belly landing.

We are exploring manufacturing smaller size Aluminium retracts for our planes becase they are not available in market, however, the price is quite high. We may need to sell a set of 3 retracts at a price of around $60. would it be acceptable? :(

Regards

X-flight

bobthenuke

Sep 08, 2005, 03:01 PM

X-flight,

If you can come up with a set of lightweight miniature retracts for $60 I think the world would beat a path to your door. :) I finally had the time to download and view your video...most impressive! Good luck with the project.

...bob

Ernest

Sep 08, 2005, 11:08 PM

Hi guys,
I am using the Robart mini retracts.
Attached with a short clips of the retracts and doors.
http://s10.yousendit.com/d.aspx?id=1XUJDJG7VF1SC0UG0MHRKC6P1C

keven64

Sep 09, 2005, 05:13 AM

FANtastic models... :rolleyes:

I have my name on one of those (http://static.rcgroups.com/forums/attachments/7/2/8/1/1/582575.attach?) motors for another microfan... :D

Keven. :)

X-flight

Sep 09, 2005, 09:52 AM

FANtastic models... :rolleyes:

I have my name on one of those (http://static.rcgroups.com/forums/attachments/7/2/8/1/1/582575.attach?) motors for another microfan... :D

Keven. :)

Dear Keven

Are you saying you want one of our motor?

We also have 5300KV and higher KV :eek: :D

PLease PM me if you want one.

X-flight

keven64

Sep 09, 2005, 10:50 AM

X-flight,

PM with explanation sent ;)

Keven. :)

bobthenuke

Sep 09, 2005, 02:44 PM

Hi guys,
I am using the Robart mini retracts.
Attached with a short clips of the retracts and doors.
http://s10.yousendit.com/d.aspx?id=1XUJDJG7VF1SC0UG0MHRKC6P1C

Hi, Ernest

Those appear to work very nicely. I suppose that I was hoping that the retracts X-flight is referring to would be *air* operated. There's another thread about some very small air operated retracts a guy is building and selling (they appear to be very nice) but the total cost for a set of three plus the rest of the system is, at least to me, quite prohibitive.

X-flight

Sep 09, 2005, 08:13 PM

Hi, Ernest

Those appear to work very nicely. I suppose that I was hoping that the retracts X-flight is referring to would be *air* operated. There's another thread about some very small air operated retracts a guy is building and selling (they appear to be very nice) but the total cost for a set of three plus the rest of the system is, at least to me, quite prohibitive.

Hi Bob

We also have air operated retracts, however, the retracts we have are for large planes. We are working on small servo operated retracts at this moment.

We also have shock absorption legs and all air system acessories.

I am sorry that our web site is not up and running at this moment, otherwise, you can find information from our site. : :o

Regards

X-flight

Ernest

Sep 09, 2005, 11:47 PM

Hi X-flight,
Do let me know when you guys have a site. BTW your retracts looks good .

X-flight

Sep 10, 2005, 07:59 AM

Hi X-flight,
Do let me know when you guys have a site. BTW your retracts looks good .

Dear Ernest

If you need any of our products of information, please feel free to give me a PM for the time being.

Regards

X-flight

Frank Feldhaus

Mar 27, 2007, 06:27 PM

rcguy01

Mar 28, 2007, 01:26 PM

Hello Rocky,

the SU-47 Berkut looks great! I love our russia jet.

Before I've started the build, I've done some measurements with the Vasa 55mm edf. The fan is no so good for high speed. I think the XF fan will fit most applications using Vasa55, GWS EDF55 with easy installation mods. I really like the XF too! Delivers great power and less noise.

BTW: Where are you puting the C.G.? The Installation Photo CD says 70mm front from the root leading edge. I haven't calculated MAC yet, I'll do that.

Here is my setup:
twin xf fans
2xDF210 8XL 5100Kv or 2xHacker B20-15L
twin esc Kontronik Jazz 40 8-16
1xHS81, 4xGWS120BB
JR SPCM 16scan receiver
Kokam 4s1p with 3200m 20C

Here some progress pics:

Frank

Great SU 47 pictures, great build.

However, I think the airframe of the SU47
is not really for the all out speed, a fairly draggy airframe.
So the XF fans are good but those Vasa 55s might be
a better choice. The Only thing is you can buy 2 XF fans
for the price of 1 Vasa 55 fan :eek: :eek:

If they are in the same price range, I would go for
the Vasa 55 without blinking my eyes. But I guess
I would consider the "you get two fans for the price of one" factor ;) ;)

jdmef7

May 03, 2007, 01:13 AM

Sorry to bring this thread back to life,but x-flight no longer has their su-47 for sale,and i was wondering if Frank built his from x-flights kit,or was his scratch built.Thanks..Ron

what_the?!

Jun 26, 2007, 05:05 AM

i have just started my build on this plane and would like to know if x-flight ever tested this jet with taileron configuration?

seems to me that with the canard configuration this might work...

are you there rocky?

X-flight

Jun 26, 2007, 10:09 AM

Hi Tim

We did not tested the taileron set up.

Since the elevators of the SU47 is small, unless you set up the canards to move together with the elevators, I "think" it would be difficult.

Regards

Rocky

what_the?!

Jun 26, 2007, 04:37 PM

hi rocky, thanks for the reply.

there is another su47 at rcg made from depron that uses tailerons only and it flies well.

are you able to test to see if this will work?.. i have made new tail that is 2 x thick as the original and is about 5% larger and was thinking of making it a full flying surface rather than hinged elevator only.

Iwa also going to keep the foreplanes fixed only.

it would be great if x-flight can check this please.

can you?

Tim