Electric Ducted Fans with Robert Wagoner

Robert Wagoner's last column for the E Zone. Robert has decided to leave us so he can spend more time working on his EDF business.

Working with the Eco Fan Pro

You may recall my July column where I discussed the Minifan 480.  This month I'd like to take a look at one of its big brothers: the Eco Fan Pro. When coupled with a high performance brushless motor like the Aveox 1409/2Y you're presented with an efficient and powerful combination. My A-10 uses two Eco Fan Pro units with Graupner Ultra 930/10 brushed motors with great success.

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The Eco Fan Pro by Wemotec


EDF unit contents.

The Eco Fan Pro is packaged in three versions: the EF 005-3 that has the 3.17 mm shaft adapter, EF 005-4 that has the 4.00 mm shaft adapter, and the EF 005-5 that has the 5.00 mm shaft adapter. The EF 005-5 or 5.00 mm version works with a variety of motor configurations like the Graupner Ultra 930 and Aveox 1409 series motors. The shaft adapter uses two 2 mm Allen screws and for convenience includes the Allen key for assembly along with the intake ring. The assembly sheet is in both German and English.

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The above diagrams, from the assembly manual, should give you an idea of how the Eco Fan Pro goes together.



Prepare a work area at least two square feet and have ready the following additional items: emery board to trim the impeller blades, 13 mm or 1/2" wrench or Nut driver for the shaft adapter, slotted screw driver for the motor screws, 2 mm Allen key for the spinner screw, and a brush on loctite or equivalent for the threaded assemblies. Review the included components assembly sheet and become familiar with the name of each item.

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Start by placing the intake ring on the fan shroud assembly.  Do not glue this on.   Even if you're not going to use it I suggest applying it so the shroud assembly is sturdy and true while verifying that the impeller is aligned and clear of all plastic flash.

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Take the impeller blade and place it over the shroud assembly and it should move freely down into the shroud as you would expect. Most units do not require the impeller to be touched, it is usually free of plastic flash. If required use the emery board very carefully on the tip edge of each impeller with a back and forth action, about 2 strokes per blade. Repeat these steps until the impeller will fall freely down inside and spins easily while resting on the motor mount.

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Remove the label from the motor so the motor can be easily placed in the housing without stressing either part. When attaching the shaft adapter first hold the motor up and press the top of the motor shaft down very lightly so it puts the end play at it's farthest extreme. Slide the adapter all the way flush to the motor housing and then pull up 2 mm and secure the Allen screws with loctite. Once complete you can now turn the adapter and you should notice about a 2 mm air gap between the bottom of the adapter and the motor.

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Before the motor is placed in the shroud a 3 mm hole must be made so the Allen wrench can be placed while the shaft nut is being tightened. This is the same technique as described in my July column..

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Press the motor in the housing and align the motor screws. Apply loctite and evenly tighten each screw until snug. This is the vertical alignment of the impeller so be especially careful that everything lines up. Any deviation will result in impeller blade trama.

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Slide the impeller on and turn it with your hand, their should be no rubbing of the blades at all. If so first check your motor alignment then if required follow the blade trimming procedure one more time for proper clearance.

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Attach the shaft adapter using the supplied Allen key pressed into the 3 mm hole next to the mounting screw that was made earlier. The long end rests towards the end of the motor on top of one stator blades making sure it's resting on the top side clock wise direction. Apply the impeller and then some loctite on the threads, apply the washer and nut then firmly tighten the nut with care since it's made of aluminum. When complete remove the Allen key and test spin the impeller blade by hand, it should move freely without rubbing. You can now attach the spinner and add loctite to the screw and snug it down.  Don't over tighten since this will flex the spinner and compress it on the impeller and cause an out of balance condition.

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You should now have the Eco Fan Pro ready for high performance action. If you are going to use the intake ring you can now secure it in place. When using other motors the Eco Fan Pro CAD drawing should be noted for the tolerances, so all the parts are orientated as designed.


Electric Jet of the Month.

Andy Telzer scratch built this Speed 300 EDF unit and airplane.

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  • Builder/Pilot: Andy Telzer
  • Span: 32"
  • Length: 24.5"
  • Wing area: 160 sq in.
  • Fan: Speed 300 scratch built from March issue of Electric Flight International magazine.
  • Battery: 7 x 600 AE
  • Weight: 12 ounces.
  • Controller: Pixie (castle creation)
  • Servos: 2, S80
  • Receiver: Hitec 555
  • Covering: Silk span and given 5 coats of dope.

Andy is currently experimenting with various cell counts to find the best ratio of power to duration.  On 6 cells the plane performs sedately but manages 8 1/2 minute flights.  On the 7 cell pack the model flies with some authority for around 5 minutes.  Next up is an 8 cell pack which Andy will attempt but which might be damaging to the Speed 300 motor.  So far Andy reports that the motor and fan unit have held up very well.


Interesting places:

Official WeMoTec site.


Did you ever want to find a plastic model kit of that rare dream airplane so you could make a plan and build it? Start here.


Lockheed Martin - Fighter Enterprise site. All things cool!


Editor's Note

I'm sad to report that Robert Wagoner has decided to end his monthly column with us so he can concentrate his time on his business, the Electric Jet Factory.  This is a loss for the magazine but a huge gain for the growing number of EDF consumers out there.

Please join me in encouraging Robert with his endeavor.  You can visit the Electric Jet Factory on the web at www.ejets.com.

Next month the EDF duties will be taken up by Christopher True, who can be reached at ctrue(at)ezonemag.com


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