On 1 nov., 17:07, Darryl Ramm wrote:
On Nov 1, 4:29*am, Andy wrote:



On Nov 1, 1:49*am, LimaZulu wrote:

First flight of Front Electric Sustainer - FES

http://www.front-electric-sustainer.com

http://www.youtube.com/watch?v=TNOKq6PKIvM

Regards,

Luka Znidarsic

If I read the specs right you can operate at full power for 14.4
minutes over which time you can climb a bit over 4,300 feet. *How's
that compare to other sustainers? *This seems simpler than most other
configurations which is nice.

9B

It would be interestingly they claim level flight for 120km which is
greater distance than a 4,300' climb will normally allow you to glide.
Just plucking numbers out of thin air of 50 knots for optimal climb
and cruise speeds (I expect climb would be slower) and an L/D of 50:1.
You would travel 22 km in the climb and glide 65km for a total of
87km. It would require a L/D 74 to match the straight cruise. The
exact optimal speeds and the profile of the climb as battery power
diminishes likely affects all this.

Looks like nice packaging. I am curious as well what happens to the
forward air cockpit air vent, nose pitot tube, nose tow hook, and
where cooling air for the engine comes from (presumably the nose
hole). At 95% efficiency the 15kW motor will generate 750W.

Darryl

Dear Darryl,

Data published are pesimistic version of calculated values. For real
data we must do more flights in calm conditions.
-Forward cockpit air vent is still used, air just goes also trought
the motor to cool the engine. And will be possible to close it during
gliding, but must be opened when engine is running
-Nose pitot tube is replaced with fin tube otherwise used for TE (TE
compensation tube was replaced with electronic compensation, and same
hole used as pitot). Flight test shows that this works just fine, as
airspeed is correct.
-LAK17a has front tow hook placed bellow instrument panel
-95% is efficiency of motor+controler. Motor have good cooling, and it
not looks that heating will be a problem. It is just warm and
controler is rated for much higher power and is not even warm.

regards,

Luka