ULF-1 single seat foot-launched sailplane was designed by Dieter
Reich and constructed by Heiner Neumann of Germany. Designed for
ridge soaring and marginal thermal currents (microlift), it has
full three-axis aerodynamic control. Its first flight was in November
1977; since that time more than 40 aircraft have been built from
plans and flown, accumulating hundreds of hours of soaring flight
time. The longest flight lasted six hours; the maximum distance
achieved is 140 km.
ULF-1 is one of the best-performing foot-launched aircraft to date,
as well as one of the safest designs available to the self-builder.
The design received a German airworthiness certificate in 1980,
and has also been approved by Australian authorities. The basic
construction materials are spruce, birch plywood and balsa. The
airframe is covered with doped fabric. For hinges, fasteners and
fittings, aluminium, steel sheet and fibreglass/resin are used.
Steel tubes are employed only for the control stick, control parts
in the cockpit area and rudder drive.
more information about the ULF-1 and its construction plans, please
visit the main EEL web site:
http://www.eel.de (site appears to be down)
(this site) exists primarily to connect builders and enthusiasts
of the ULF-1 design for mutual support and dissemination of related
information. We host an e-mail based discussion group that connects
plans-holders, builders and enthusiasts world-wide. To join the
group, please use this link and follow the instructions you'll find
ULF-1 Discussion Group
The original site maintainer Doug DuBois passed away on March 7, 2021, his obituary can be found here.