<s>
RealFlight	B-Application
RC	O
Simulator	O
is	O
a	O
radio-controlled	O
airplane	O
and	O
helicopter	O
simulation	O
software	O
series	O
developed	O
by	O
and	O
now	O
published	O
by	O
.	O
</s>
<s>
Note	O
:	O
Although	O
RealFlight	B-Application
RC	O
Simulator	O
has	O
a	O
similar	O
name	O
to	O
Real	O
Flight	O
Simulator	O
it	O
has	O
nothing	O
to	O
do	O
with	O
it	O
.	O
</s>
<s>
Real	O
Flight	O
Simulator	O
(	O
goes	O
around	O
with	O
a	O
few	O
different	O
names	O
)	O
is	O
a	O
commercial	O
rebranding	O
of	O
an	O
old	O
version	O
of	O
the	O
free	O
and	O
opensource	O
flight	O
simulator	O
Flightgear	B-Language
.	O
</s>
<s>
Included	O
with	O
RealFlight	B-Application
RC	O
Simulator	O
are	O
various	O
flying	O
sites	O
(	O
or	O
airports	O
)	O
and	O
aircraft	O
models	O
,	O
almost	O
all	O
of	O
which	O
represent	O
real-life	O
models	O
.	O
</s>
<s>
Within	O
RealFlight	B-Application
,	O
editing	O
aircraft	O
is	O
limited	O
to	O
changing	O
the	O
physical	O
and	O
aerodynamic	O
properties	O
.	O
</s>
<s>
In	O
order	O
to	O
create	O
new	O
visual	O
models	O
,	O
the	O
use	O
of	O
a	O
3D	O
modeling	O
application	O
such	O
as	O
Autodesk	B-Language
3ds	I-Language
Max	I-Language
or	O
Blender	B-Application
is	O
required	O
.	O
</s>
<s>
The	O
most	O
recent	O
is	O
RealFlight	B-Application
9	O
,	O
which	O
included	O
additions	O
such	O
as	O
water	O
and	O
water	O
physics	O
,	O
an	O
improved	O
user	O
interface	O
,	O
more	O
aircraft	O
,	O
more	O
flying	O
sites	O
,	O
and	O
an	O
improved	O
"	O
InterLink	O
Elite	O
"	O
controller	O
.	O
</s>
<s>
RealFlight	B-Application
requires	O
the	O
connection	O
of	O
an	O
InterLink	O
controller	O
,	O
which	O
is	O
included	O
with	O
the	O
software	O
,	O
in	O
order	O
to	O
operate	O
.	O
</s>
<s>
Knife	O
Edge	O
Software	O
also	O
develops	O
packs	O
containing	O
additional	O
content	O
for	O
RealFlight	B-Application
,	O
each	O
of	O
which	O
adds	O
new	O
airfields	O
and	O
additional	O
aircraft	O
.	O
</s>
<s>
For	O
users	O
of	O
RealFlight	B-Application
G4	I-Application
or	O
newer	O
,	O
the	O
older	O
series	O
of	O
"	O
Add-On	O
"	O
packs	O
have	O
been	O
reworked	O
,	O
with	O
several	O
aircraft	O
receiving	O
updates	O
,	O
and	O
can	O
be	O
downloaded	O
freely	O
from	O
the	O
RealFlight	B-Application
website	O
.	O
</s>
<s>
The	O
Add-Ons	O
line	O
is	O
compatible	O
with	O
versions	O
of	O
RealFlight	B-Application
dating	O
back	O
to	O
RealFlight	B-Application
Classic	O
,	O
with	O
the	O
exception	O
of	O
Add-Ons	O
5	O
,	O
which	O
requires	O
RealFlight	B-Application
G2	O
or	O
higher	O
.	O
</s>
<s>
Expansion	O
Pack	O
1	O
through	O
Expansion	O
Pack	O
4	O
require	O
RealFlight	B-Application
G3	I-Application
or	O
higher	O
,	O
and	O
Expansion	O
Pack	O
5	O
and	O
up	O
require	O
RealFlight	B-Application
G4	I-Application
or	O
higher	O
.	O
</s>
