eFlight Journal 02-2020

e Aviation Talk
Evektor EV 55 electrical conversion product
A hybrid electric powertrain for UL / LSAs.
-39 Trainer which is based on the UL-39 Replica of the famous
Czech Fighter Jet trainer L-39. This should fly very
soon.
eFJ: Will the UL 39 get an e-Motor with a propeller?
M.D.: No. Like the version with the Rotax it will have a
ducked fan which we drive with an e-Motor with 150 KW.
eFJ: Is your company only working in e-Propulsion
for aviation?
M.D.: No, we work with different industries like boats in
many countries.
eFJ: Are you only producing electronics?
M.D.: No we also have CNC Machines for mechanical
parts mainly for prototyping but as well for some production
parts.
eFJ: You mentioned several fixed-wing projects: are
you also working with eVtol and drone manufacturers?
M.D.: Yes, but most of them are under a strict NDA. We
can only mention some of them so for example we work
with Bell, XTI and some smaller drone manufacturers.
eFJ: Which power range are you working on?
M.D.: From a few watts up to 450 KWatts. These are the
latest range of controllers which we wanted to introduce
at AERO expo and now we are introducing them here.
eFJ: Which maximum voltage are the large systems
working?
M.D.: Our latest system is working at 800 Volts.
eFJ: Which is in your opinion the most critical part of
the propulsion system?
M.D.: Next to the Motor controllers this is the BMS and
the complete design of the battery pack including packing
– the housing, the redundant controlling.
eFJ: Concerning the Batteries,as the power density is
The Czechs also
brought the hoverbike
into the air. It remains
to be seen whether this
non-redundant drive
with free-running propellers
is approved,
or if it is more a “pilot
wrench“.
18 e Flight Journal
2 / 2020