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News From RANS:
It has been a busy week at RANS
preparing for Airventure 2017. And we are happy to
announce we will be bringing an S-21, at least the
fuselage and partial tail, for static display in our
booth. This static display will be excellent for the
up close look at how this fast build plane is going
together. Also in our booth will be the Raven with
the S-21 metal wings. We are using our demo Raven as
a test bed to validate the performance of the new
wings. Please stop by to take a look at all the new
and exciting innovation happening in the RANS booth
620-621, in the Homebuilt area (close to War Birds)
in the North Static Display area, at Airventure 2017
in Oshkosh WI.
S-20 with Metal Wing: Flight
RANS S-21: High Points of Dual
In a two spar wing the load is shared between the
spars. In the outbound 75% of the load is on the
front spar and 25% on the rear. In the case of a
single strut single spar wing the rear spar has to
be there anyway, so why not share the load. This
reduces the weight and size of the main spar. It
also positions the front spar to the leading edge of
the wing that allows more advantages…read on.
The front and rear spar locations are
conveniently located where you would want the door
posts. This allows for big doors for easy cabin
entry and cargo loading.
Fuel On Center of Gravity
The wide spar spacing allows the wing tank to be
located near the center of gravity. This minimizes
CG movement between full and empty tanks. The CG of
the wing tank is kept as close to the wing root as
possible, keeping weight near the aircraft
Pre-formed leading edge
By including the leading edge in the front spar
extrusion, the need to bend and fight a sheet metal
leading edge is eliminated. The extra thickness of
the leading edge provides a robust structure to
resist bird strikes and hangar rash.
Ease of Assembly
Perhaps the hallmark of this design is the ease
of assembly. In a matter of hours you will have a
completed wing. This is due to a high level of
pre-fabricated parts ready to assemble, and having
an overall design concept that eliminates many of
the critical and time consuming elements of sheet
metal wing construction.
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