Electric Ducted Fan Jets Discuss electric ducted fan jets here including setup tips, power systems, flying techniques, etc.

GWS A4 Skyhawk

Old 02-16-2008, 12:47 PM
  #26  
ParkJetsFlyer
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I think it's just the angle of the photo Here is some info on the Plane and a few more photo's.


Last of the Scooters. TA-4J, BuNo. 158137, wearing the classic two-tone blue adversary paint scheme of Fleet Composite Squadron Eight, "The World Famous Redtails." Based at NS Roosevelt Roads, Puerto Rico, VC-8 was the last Navy operator of the A-4 Skyhawk, using the "Scooter" to provide dissimilar air combat training to Atlantic Fleet air wings. This particular TA-4J served with VC-8 as modex 00 until May 2003, when it was retired and acquired by the USS Hornet Museum (with assistance from the A-4 Skyhawk Association).
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Old 02-18-2008, 05:50 PM
  #27  
USMC_VTOL_Mech
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Just got the power system for my third gws a-4
HET 6904 fan, HET typhoon 2w-23 motor 3300 Mah 5 cell lipo and hacker 70 amp esc...good for around 850 watts
This set-up should power it like a rocket
gotta stop by epyaya.com tomorrow and pick up another a-4
my other two scooters are great flyers and tons of room for different mods
This one will have retracts
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Old 02-18-2008, 06:00 PM
  #28  
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Nice looking bird there bud! Love the detail work on the airframe!

Oh and Welcome to Wattflyer!
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Old 02-18-2008, 06:18 PM
  #29  
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Firemanbill
tyvm!
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Old 02-18-2008, 07:45 PM
  #30  
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Good Lord, that thing is going to scream! Can't wait to see the retracts version.

Get some video when you maiden that #3! I want to see her shakin' and movin'.

Looks like a Phase3 P-38 found a good home, too.

Welcome to WattFlyer!
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Old 02-18-2008, 08:20 PM
  #31  
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PerlAddict
thanks for the warm welcome
Yes she is gonna be a barn burner alright
I ran the fan up last night and after three clicks of throttle I couldn't hold it anymore and I started visioning trips to the ER to replace severed fingers
I chickened out and shut her down
We will wait to run this thing up in the airplane
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Old 02-18-2008, 08:33 PM
  #32  
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Sweet!

I can relate to the er thing for stiches... not fun!
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Old 02-18-2008, 08:34 PM
  #33  
pburt1975
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Originally Posted by USMC_VTOL_Mech View Post
PerlAddict
thanks for the warm welcome
Yes she is gonna be a barn burner alright
I ran the fan up last night and after three clicks of throttle I couldn't hold it anymore and I started visioning trips to the ER to replace severed fingers
I chickened out and shut her down
We will wait to run this thing up in the airplane

Sounds like a heck of a power plant. Its going in a nice jet thats for sure.
GL with the maiden.
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Old 02-18-2008, 09:04 PM
  #34  
herk_1
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Love the sooty panel lines, that really adds realism. Good to see people finding workable alternatives to the troublesome stock powertrain. They should have made these new single-engine jets a bit smaller to begin with, so that the readily available third-party EDFs in the 69-70mm size would be a drop-in.
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Old 02-18-2008, 09:14 PM
  #35  
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Herk1
They are actually not that bad and very workable
here is a hi-maxx 69 MM fan ready for install in the j-10
A wrap of 3 mm depron to take up the gap is perfect and allows you to make a nice intake lip...kinda makes fitting the thrust tube cake also
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Old 02-19-2008, 01:58 AM
  #36  
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Originally Posted by herk_1 View Post
Love the sooty panel lines, that really adds realism. Good to see people finding workable alternatives to the troublesome stock powertrain. They should have made these new single-engine jets a bit smaller to begin with, so that the readily available third-party EDFs in the 69-70mm size would be a drop-in.
The new GWS J-10 is set up for a minifan sized EDF for around the same price as the A-4



Available at www.ejf.com among other places
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Old 02-19-2008, 03:15 AM
  #37  
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The J-10 is designed for the GWS EDF 75, the same as the A-4. Minifan is 70mm isn't it? Mr. Lin was even cautioning against poor expected performance when using smaller-than-75mm EDFs -- for both the J-10 and A-4 (e.g. here, here, and here). It appears that some people like USMC_VTOL_Mech are showing that that caution may have been unwarranted.
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Old 02-19-2008, 03:30 AM
  #38  
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Herk1
Extremely unwarrented
Mr Lin just wants everyone to use his motor product...no matter how poor the performance and longevity is
I use a Hi-maxx 69 MM fan unit and hi-maxx motor in my J-10 (same motor and fan as in the multiplex twister)
Great results and speeds are around 60 MPH And this is a fairly large size model....about 4 inches under 4 feet long
I can fly no problems 6 to 7 minutes with a 3300 Mah 3 cell on this set-up...and only pull 33 amps
The only thing is the exhaust is way to huge on both these models
Even to big for a 75 MM fan unit
So a thrust tube tapered down to the correct diameter is an absolute must
Around 2 inches for a 69 MM fan....2 1/4 for the stock 75 MM fan
Can't wait to start on my new a-4!
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Old 02-25-2008, 08:10 AM
  #39  
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I can also vouch for thier unwarrented cautions against 70mm fans. I have seen several people on the forums with video that have gotten the beauties to fly on 70mm fans, Me being 1.

ParkJetsFlier, That is an georgeous choice for a scheme. Its what mine is patterned after. I am working on the decals to finish mine off. In the pics it looks grey but its the camera as it is 2 different shades of blue.

Jason

P.S. USMC get er done.
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Old 02-25-2008, 04:19 PM
  #40  
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Jason I started last night
I wanted to do the split intake mod but am having a hard time trying to figure out the best way to mount the splitter plates...before or after fusealage assembly?
I want to keep my esc accessable so i can change it if need be
I did do the swash plates at the front of the intakes and they look much better now
Once I figure this intake out the rest will flow right along
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Old 02-25-2008, 06:52 PM
  #41  
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usmc, I put in the splitters before glueing the halves together. Its easier to get secured properly that way.

As for the ESC just notch the bottom of the splitter to allow it to come out. In mine its notched and can come out once you take out the fan. Slide back from under the splitter.

On RCG I think I posted pics of how it sits under the splitter in mine. If not let me know and I will post them here or if anyone else would like pics of the mod let me know.

Jason
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Old 02-25-2008, 10:21 PM
  #42  
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Ok well just did a quick test on the scale of thrust with the thrust tube installed. First the numbers from the stock fan and the current fan without the thrust tube.

Wattage/Wemo/Mega on 4s without thrust tube:
AUW=34.8 oz.
Thrust=23.4 oz. (After about 10 seconds)
Current=31.2A (After about 10 seconds)
Power=452 (After about 10 seconds)
Volts=15.92 (After test run)

Stock Numbers on 3s with stock exit ducting:
AUW=33.2 or so
Thrust=20.7 oz. (After about 10 seconds)
Current=34A (After about 10 seconds)
Power=394 Watts (After about 10 seconds)
Volts=12.35 (After test run)

Now the thrust numbers I got with the thrust tube:

Wattage/Wemo/Mega on 4s with thrust tube:
AUW=35.2 oz.
Thrust=26.5 oz. (After about 10 seconds)
Current=33.4A (After about 10 seconds)
Power=480 Watts (After about 10 seconds)
Volts=15.8 (after test run)

Now unless I have lost my mind or was halucinating when I did the first batch of tests the thrust has gone up . Which I though was supposed to be the opposite as efflux is supposed to go up and thrust down ? I am really confused. Ideas?

Jason
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Old 02-25-2008, 11:55 PM
  #43  
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Jason
Pics of the splitter set-up PLEASE!
I am not gonna try and page thru all that crap at RCG looking for those pics
I will post some pics of mine when I do it...I am smoothing the intakes now with finishing resin...and the rest of the plane for that matter
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Old 02-26-2008, 01:07 AM
  #44  
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Ok USMC and all here you go. Now I cannot take credit for this mod as it was first done by an RCG member named CorsairNut. I liked the results of this mod and it made perfect sense so I did it. Oh and I use packing tape instead of lining the ducting with resin. Gives about the same smooth surface with less hassle.

Now is you look at the kinda side view I did after the splitter or island was installed and sanded in its final shape there is a cut out for the spinner of the fan unit. I do plan on making a sorta cone that will divert airflow around the fan spinner to further clean up airflow into the fan.

Hope these pics help. I had to split my posts up as there are so many pics I took to show the mod in various stages.

Jason
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Old 02-26-2008, 01:10 AM
  #45  
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Ok second half of post. This is how she currently looks if you were to pull off the hatch. Note the notch in the splitter / Island to clear the fan spinner.

Jason
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Old 02-26-2008, 02:02 AM
  #46  
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Jason
I know CN well
I have one of his planes here on my wall that I bought from him one day while we were at the flying field
He did not post very detailed pics of his splitter though
Yours show much more detail
I was a little concerned because my splitter plates were kinda twisted but now I see yours does the same
I see on the front half of the fuse you chopped the back off!
I was gonna just leave mine there and fuse the splitter plates in....think that would work also?
Here is a pic of the intake plates I did on the front
Tell me what you think?
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Old 02-26-2008, 02:06 AM
  #47  
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BTW
I was gonna use packing tape to smooth the ducts but I was afraid it might start lifting and get sucked into the fan....probably right when I juiced it up to 45K.....just my luck
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Old 02-26-2008, 02:35 AM
  #48  
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They look good to me. I had seen those on RCG but not till after I already had my fuse together.

On the splitter extension, they should be ok as long as you can get them blended enough to not hamper air flow or cause turbulence. Turbulance is what the extension is supposed to help reduce.

Jason
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Old 02-26-2008, 08:55 AM
  #49  
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Originally Posted by FresnoJay View Post
Ok second half of post. This is how she currently looks if you were to pull off the hatch. Note the notch in the splitter / Island to clear the fan spinner.

Jason
is that the HET Fan ?
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Old 02-26-2008, 09:21 AM
  #50  
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Actually no. Its a stock Wattage PowerFan 400 housing with a Wemotec 505 rotor being spun by a Mega 16/7/5 motor.

If your not familiar with the rotor it is a special rotor Wemotec makes that is designed for the odd ball fan sizes I.E. Wattage and the like. Its nothing more than a factory cut down MF 480 rotor assembly. Here's a link to the page at the Wemotec online shop.

http://www.wemotec.com/prototype/pro..._id=43&cPath=1

Jason

*EDIT* Atthe time I bought my Wemo 505 Kit it cost me about $30. It has gone up just a bit since then. I have had this fan unit as it sits housing/rotor/motor in service for about a year now with no issues. It was one of the few things that survived the crash of the Wattage Mig-15 it was in that whole time. Mind you it was ejected about 15 feet from the impact size. Still works like new.
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