Correctly Balancing your RC airplanes
The Theory Correctly   balancing   your   rc   airplanes   is   so   important   for   safe   flying,   because   any   deviation from   the   model's   Center   of   Gravity   (CG)   can   and   probably   will   result   in   the   model   being quite uncontrollable. Every   rc   airplane   has   a   correct   CG,   this   is   the   point   where   the   model   balances   fore-aft correctly.   If   you've   built   from   a   plan,   then   the   CG   should   be   marked   on   the   plan.   If   you've bought   an   ARF   or   RTF   plane,   then   the   manufacturer's   instruction   manual   should   tell   you where the CG lies for that particular model. A   badly   balanced   rc   airplane   will,   at   best,   be   hard   to   control,   and   this   is   especially   true   for tail-heavy planes. At worst, the plane will crash within seconds of getting airborne!   A   way   of   balancing   RC   airplanes      High   wing   trainers   are   the   easiest   airplanes   to   balance,   and   if   it's   your   first   plane   then   this is likely to be the case. Obviously   the   first   thing   you   need   to   do   is   identify   the   correct   Center   of   Gravity,   according   to   the   plan   or   manual.   As   a general   rule   of   thumb,   the   CG   will   be   about   one-third   of   the   wing   chord   (width)   back   from   the   leading   edge   of   the   wing.   The main spar often lies in this general area. HAPPY LANDINGS. Place   the   tips   of   your   index   or   middle   fingers   under   each   wing,   on   the   line   of   the   CG,   a   couple   of   inches   out   from   the fuselage. Gently lift the airplane up so it is clear of any surface, and let it hang freely on your fingers. A   correctly   balanced   airplane   will   either   be   level,   or   have   the   nose   pointing   slightly   downwards.   If   the   tail   points   downwards, then the model is tail heavy and you need to do something about it. If   the   balance   does   need   to   be   adjusted   to   get   the   correct   CG,   the   first   thing   to   do   is   try   moving   the   battery   pack   or   any   of the   rc   gear   either   further   forward   or   further   back   inside   the   plane.   By   doing   this,   you   are   adjusting   the   balance   without adding extra 'dead' weight to the model in the form of ballast. The   motor/receiver   battery   pack   is   by   far   the   best   thing   to   move,   because   it   is   the   heaviest   item   and   will   have   the   most   effect with   the   smallest   amount   of   movement.   Carefully   try   and   reposition   it   fore   or   aft,   carefully   rechecking   the   balance   of   the plane   after   you've   moved   it.   Once   you're   happy   with   the   new   balance,   make   sure   that   the   battery   pack   is   secure   and   won't move from its new position. If   you   can't   reposition   anything,   which   is   always   a   possibility   in   RTF   airplanes,   you   might   have   to   add   ballast   to   either   the nose   or   the   tail   of   the   plane   to   correct   the   CG.   You   need   to   remember,   though,   that   ballast   adds   dead   weight   to   a   model which   is   never   good   -   the   lighter   a   plane   is,   the   better   it   performs.   So   if   you   do   need   to   add   ballast   to   correct   the   CG,   you need to add as little as possible. The   way   to   do   this   is   to   add   the   ballast   as   far   forward   or   as   far   back   as   you   possibly   can   on   the   model.   By   doing   this,   the ballast   will   have   the   most   effect   on   the   CG.   Add   only   enough   to   make   your   plane   balance   correctly   on   your   fingertips. Suitable   ballast   to   add   to   an   rc   airplane   is   modeling   clay   or   fishing   shots,   for   example.   Whatever   ballast   you   do   add,   make sure it is secure to the plane, and won't drop off in flight!
Correctly Balancing your RC airplanes
The Theory Correctly   balancing   your   rc   airplanes   is   so   important   for   safe   flying,   because   any deviation   from   the   model's   Center   of   Gravity   (CG)   can   and   probably   will   result   in the model being quite uncontrollable. Every   rc   airplane   has   a   correct   CG,   this   is   the point     where     the     model     balances     fore-aft correctly.   If   you've   built   from   a   plan,   then   the   CG should   be   marked   on   the   plan.   If   you've   bought an   ARF   or   RTF   plane,   then   the   manufacturer's instruction   manual   should   tell   you   where   the   CG lies for that particular model. A   badly   balanced   rc   airplane   will,   at   best,   be hard   to   control,   and   this   is   especially   true   for tail-heavy   planes.   At   worst,   the   plane   will   crash within seconds of getting airborne!    A   way   of   balancing   RC   airplanes      High   wing trainers   are   the   easiest   airplanes   to   balance,   and   if   it's   your   first   plane   then   this is likely to be the case. Obviously   the   first   thing   you   need   to   do   is   identify   the   correct   Center   of   Gravity, according   to   the   plan   or   manual.   As   a   general   rule   of   thumb,   the   CG   will   be about   one-third   of   the   wing   chord   (width)   back   from   the   leading   edge   of   the   wing. The main spar often lies in this general area. HAPPY LANDINGS. Place   the   tips   of   your   index   or   middle   fingers   under   each   wing,   on   the   line   of   the CG,   a   couple   of   inches   out   from   the   fuselage.   Gently   lift   the   airplane   up   so   it   is clear of any surface, and let it hang freely on your fingers. A   correctly   balanced   airplane   will   either   be   level,   or   have   the   nose   pointing slightly   downwards.   If   the   tail   points   downwards,   then   the   model   is   tail   heavy   and you need to do something about it. If   the   balance   does   need   to   be   adjusted   to   get   the   correct   CG,   the   first   thing   to do   is   try   moving   the   battery   pack   or   any   of   the   rc   gear   either   further   forward   or further   back   inside   the   plane.   By   doing   this,   you   are   adjusting   the   balance without adding extra 'dead' weight to the model in the form of ballast. The   motor/receiver   battery   pack   is   by   far   the   best   thing   to   move,   because   it   is the   heaviest   item   and   will   have   the   most   effect   with   the   smallest   amount   of movement.   Carefully   try   and   reposition   it   fore   or   aft,   carefully   rechecking   the balance   of   the   plane   after   you've   moved   it.   Once   you're   happy   with   the   new balance,   make   sure   that   the   battery   pack   is   secure   and   won't   move   from   its   new position. If   you   can't   reposition   anything,   which   is   always   a   possibility   in   RTF   airplanes, you   might   have   to   add   ballast   to   either   the   nose   or   the   tail   of   the   plane   to   correct the   CG.   You   need   to   remember,   though,   that   ballast   adds   dead   weight   to   a model   which   is   never   good   -   the   lighter   a   plane   is,   the   better   it   performs.   So   if you   do   need   to   add   ballast   to   correct   the   CG,   you   need   to   add   as   little   as possible. The   way   to   do   this   is   to   add   the   ballast   as   far   forward   or   as   far   back   as   you possibly   can   on   the   model.   By   doing   this,   the   ballast   will   have   the   most   effect   on the    CG.    Add    only    enough    to    make    your    plane    balance    correctly    on    your fingertips.   Suitable   ballast   to   add   to   an   rc   airplane   is   modeling   clay   or   fishing shots,   for   example.   Whatever   ballast   you   do   add,   make   sure   it   is   secure   to   the plane, and won't drop off in flight!
CONCORD MFC         CONCORD MODEL FLYING CLUB
CONCORD MFC         CONCORD MODEL FLYING CLUB