Electric Ducted Fan

HomeBuiltAirplanes.com

Help Support HomeBuiltAirplanes.com:

vhhjr

Well-Known Member
HBA Supporter
Joined
Jun 29, 2003
Messages
149
It looks like VasyFan may have the answer to all those trying to design a ducted fan powered aircraft. Their latest fan is a 570 mm diameter unit with over 300 lbs of thrust. I sent an inquiry to them and got the following reply:

"
thank you for contacting us and considering VasyFan. Our product VF-570mm is under development, at the moment we do not have much information beyond the measurements you have seen on the site and estimated weight about 28/30 kg with the REX90 60kw motor.
I believe that in less than 2 months we will have the first prototype ready to carry out the various continuous thrust and peak thrust tests.
This Edf 570mm vera used together with the MGM HBC400400 ESC with 400V batteries.

As for the price, we are around 20,000 euros VF-570 + REX90 + HBC400400.
In our opinion it is a fairly low price compared to a jet engine of equal thrust which costs over 60,000 euros."

Time to rev up the Solidworks. This is considerably more thrust than the SubSonex engine produces and with the high fuel consumption of small jet engines you might be able to carry enough batteries to get out of sight of your airport.

For those designing twin jet aircraft Vasyfan already makes a 390mm unit with a 45 kw motor that develops 58 kg of thrust.

Vince Homer
 

Dan Thomas

Well-Known Member
Joined
Sep 17, 2008
Messages
5,761
Ducted fans have been tried on light airplanes several times. They weren't found to offer any worthwhile advantage. Airliners use ducted fans as a means of producing thrust at high forward speeds where props won't work. They do it with a diverging duct into the fan, slowing the air and increasing its pressure.

Electric ducted fans would look appropriate in a fighter jet replica, maybe.
 

henryk

Well-Known Member
Joined
Mar 8, 2010
Messages
5,857
Location
krakow,poland

vhhjr

Well-Known Member
HBA Supporter
Joined
Jun 29, 2003
Messages
149
Nobody builds a replica fighter because they want a practical airplane. This would be even truer with a replica jet using a ducted fan.

Vince Homer
 

Vigilant1

Well-Known Member
Lifetime Supporter
Joined
Jan 24, 2011
Messages
5,898
Location
US
A fully electric ducted fan will be a tough challenge. Coupling a power source with low specific energy to a ducted fan with its own low efficiency is not a recipe for sprightly performance.

If the fans can be set up for 6000 to 10,000 rpm, they might pair well with 2 strokes or Wankels. They won't be as efficient as props, but they could result in flights longer than a few trips around the pattern and avoid the need for a PSRU.
 
Last edited:

Jay Kempf

Curmudgeon in Training (CIT)
Lifetime Supporter
Joined
Apr 13, 2009
Messages
4,260
Location
Warren, VT USA
Thrust, endurance, weight. That weight thing. You can afford A LOT of jet fuel for a lb of batteries.
 

Urquiola

Well-Known Member
Joined
Aug 23, 2013
Messages
154
Location
Madrid, Spain
Yeah, there was Russian team prpearing a Mig like with ducted fans, the issue is they conisidered an avionized car engine, see 'Power struggle, why car engiens won't fly' from Smithsonian Institution, also some proposals look as the Caproni-Vampini motojet, having air entries with moveable parts as to adapt to near Mach 1 speed, when it failed in going at 500 km/ h. Some German designs, eg, Heinkel S-50, included reciprocating engines moving axial compressors, as the attached Spanish patent, too many novelties in same design, never built because of author's death, in mockup in Museo del Aire, Cuatro Vientos, Madrid.
In this, having heat from engine and engine exhaust behind fan helps in taking advantage of heat to increase thrust, as in the radiator in Mustang P-51, also could be considered having a pulse jet inside a ramjet, for same reason.
Depending on how you arrange the air flow to engine, and the exhaust and cooling system, air-cooled engines look better for this, drag can be sensible, as it was in the Stipa barrel airplane, propeller inside duct in fuselage. Blessings +
 

Attachments

rv6ejguy

Well-Known Member
Joined
Jun 26, 2012
Messages
4,160
Location
Calgary, Alberta, Canada
Lots of folks flying auto engines for decades now. They work just fine if you know what you're doing, choose a well designed core engine, gearbox and reliable supporting systems..
 

henryk

Well-Known Member
Joined
Mar 8, 2010
Messages
5,857
Location
krakow,poland
Yes, I think this about our airplane.
Nothing wrong of using auto engines on airplanes, particularly GM LS engines - they are very strong and design for sport cars. This engines also used in the race cars.
We're also looking to use electric ducted fan in our PJ-II "Dreamer" too!


=lowering blade/duct gap...(source of noise and drag !)

PS=serious investigation=

 

henryk

Well-Known Member
Joined
Mar 8, 2010
Messages
5,857
Location
krakow,poland

Urquiola

Well-Known Member
Joined
Aug 23, 2013
Messages
154
Location
Madrid, Spain


=lowering blade/duct gap...(source of noise and drag !)
Thanks for info. He S 50 motored turbine is described in Max Bentele book 'Engine revolutions', SAE

PS=serious investigation=

 
Top