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Takeoff

Before  you  get  ready  to  takeoff,  see  how  the  model
handles on the ground by doing a few practice runs at

low speeds

on the runway. Hold “up” elevator to keep

the tail wheel on the ground. If necessary, adjust the tail
wheel so the model will roll straight down the runway. If
you need to calm your nerves before the maiden flight,
shut the engine down and bring the model back into the
pits. Top off the fuel, then check all fasteners and control
linkages for peace of mind.

Remember to takeoff into the wind. When you’re ready,
point the model straight down the runway, hold a bit of
up elevator to keep the tail on the ground to maintain
tail  wheel  steering  and  then  gradually  advance  the
throttle. As the model gains speed decrease up elevator
allowing  the  tail  to  come  off  the  ground.  One  of  the
most important things to remember with a tail dragger is
to always be ready to apply 

right

rudder to counteract

engine torque. Gain as much speed as your runway and
flying site will practically allow before gently applying
up elevator, lifting the model into the air. At this moment
it is likely that you will need to apply more right rudder
to counteract engine torque. Be smooth on the elevator
stick, allowing the model to establish a 

gentle

climb to

a safe altitude before turning into the traffic pattern.

Flight

For reassurance and to keep an eye on other traffic,
it is a good idea to have an assistant on the flight line
with  you.  Tell  him  to  remind  you  to  throttle  back
once the plane gets to a comfortable altitude. While
full  throttle  is  usually  desirable  for  takeoff,  most
models fly more smoothly at reduced speeds.

The  Sukhoi  is  capable  of  virtually  all  aerobatic
maneuvers. Loops, point rolls, knife edge, spins etc.
are  all  within  the  capabilities  of  this  airplane.  For
those  of  you  who  have  the  desire  to  try  3-D
maneuvers you will find that the Sukhoi is capable
of many of the basic 3D flight maneuvers as well as
some of the more advanced ones. Using an engine
from  the  upper  end  of  the  engines  recommended,
will provide you with the best choice for flying 3D. 

Take it easy with the Hobbico Sukhoi for the first few
flights,  gradually  getting  acquainted  with  it  as  you
gain confidence. Adjust the trims to maintain straight
and level flight. After flying around for a while, and
while  still  at  a  safe  altitude  with  plenty  of  fuel,
practice  slow  flight  and  execute  practice  landing
approaches by reducing the throttle to see how the
model handles at slower speeds. Add power to see
how  she  climbs  as  well.  Continue  to  fly  around,
executing  various  maneuvers  and  making  mental
notes (or having your assistant write them down) of

what trim or C.G. changes may be required to fine
tune  the  model  so  it  flies  the  way  you  like.  Mind
your  fuel  level,  but  use  this  first  flight  to  become
familiar with your model before landing.

Landing

To  initiate  a  landing  approach,  lower  the  throttle
while on the downwind leg. Allow the nose of the
model  to  pitch  downward  to  gradually  bleed  off
altitude.  Continue  to  lose  altitude,  but  maintain
airspeed by keeping the nose down as you turn onto
the crosswind leg. Make your final turn toward the
runway  (into  the  wind)  keeping  the  nose  down  to
maintain  airspeed  and  control.  Level  the  attitude
when  the  model  reaches  the  runway  threshold,
modulating  the  throttle  as  necessary  to  maintain
your  glide  path  and  airspeed.  If  you  are  going  to
overshoot,  smoothly  advance  the  throttle  (always
ready on the right rudder to counteract torque) and
climb  out  to  make  another  attempt.  When  you’re
ready to make your landing flare and the model is a
foot  or  so  off  the  deck,  smoothly  increase  up
elevator  until  it  gently  touches  down.  Once  the
model  is  on  the  runway  and  has  lost  flying  speed,
hold  up  elevator  to  place  the  tail  on  the  ground,
regaining tail wheel control.

One final note about flying your model. Have a goal or
flight plan in mind for 

every 

flight. This can be learning

a  new  maneuver(s),  improving  a  maneuver(s)  you
already know, or learning how the model behaves in
certain conditions (such as on high or low rates). This is
not necessarily to improve your skills (

though it is never

a  bad  idea!)

,  but  more  importantly  so  you  do  not

surprise yourself by impulsively attempting a maneuver
and  suddenly  finding  that  you’ve  run  out  of  time,
altitude  or  airspeed.  Every  maneuver  should  be
deliberate, not impulsive. For example, if you’re going
to  do  a  loop,  check  your  altitude,  mind  the  wind
direction  (anticipating  rudder  corrections  that  will  be
required  to  maintain  heading),  remember  to  throttle
back  at  the  top,  and  make  certain  you  are  on  the
desired  rates  (high/low  rates).  A  flight  plan  greatly
reduces  the  chances  of  crashing  your  model  just
because  of  poor  planning  and  impulsive  moves.

Remember to think.

Have a ball!  But always stay in control and fly in a
safe manner.

GOOD LUCK AND GREAT FLYING!

24

Summary of Contents for SUKHOI SU31 .50-.91 ARF

Page 1: ...r of the final user assembled product By the act of using the user assembled product the user accepts all resulting liability If the buyer is not prepared to accept the liability associated with the u...

Page 2: ...g the AMA provides many benefits one of the primary reasons to join is liability protection Coverage is not limited to flying at contests or on the club field It even applies to flying at public demon...

Page 3: ...to end up with a well built model This is a partial list of items required to finish the Hobbico Sukhoi SU31 that may require planning or decision making before starting to build Order numbers are pr...

Page 4: ...xy is specified you may use either 30 minute or 45 minute epoxy or 6 minute epoxy When 30 minute epoxy is specified it is highly recommended that you use only 30 minute or 45 minute epoxy because you...

Page 5: ...Canopy 11 Right wing 12 Stab elevators 13 Fin Rudder 14 Engine Mount Qty 2 15x15x15mm hardwood block 2 15x15x10mm hardwood block 2 155mm length of Velcro 2 3mm plywood wing joiner 1 Plywood wing bolt...

Page 6: ...by telephone at 217 398 8970 Order Number Description How to purchase HCAA3630 Wing Hobby Supplier HCAA3631 Fuse belly pan Hobby Supplier HCAA3633 Tail Surfaces Hobby Supplier HCAA3632 Cowl Hobby Supp...

Page 7: ...rvos in the wing will require the use of one 6 152mm servo extension for each aileron One Y harness connector is required and is used to allow the aileron servos to plug into one slot in your receiver...

Page 8: ...Install a silicone clevis keeper onto the clevis and then install the clevis in the second hole from the end of the aileron control horn 6 Be sure the aileron servo is centered Enlarge the second oute...

Page 9: ...center of the wing as measured at the wing tip should be approximately 2 3 8 60mm Block the wingtip up while the glue cures Note Due to production techniques there may be some variance in the actual d...

Page 10: ...35mm 1 3 8 machine screws and two 4mm washers 9 Cut the covering from the wing bolt holes in the belly pan Place the belly pan onto the bottom of the wing aligning it with the fuselage Mark the outlin...

Page 11: ...ab use a fine felt tip marker and trace the outline of the fuselage onto the top and bottom of the stab Cut the center section of the covering from the top and bottom of the stab using the same techni...

Page 12: ...res 9 Insert three hinges into the rudder Then slide the rudder onto the fin Apply thin CA onto the hinges the same as was done with the other control surfaces This completes the installation of the t...

Page 13: ...he flange to the fuselage with three 2 x 7mm 5 16 sheet metal screws INSTALL ENGINE FUEL TANK THROTTLE SERVO 1 The top of the engine mount can be identified by the angled bevel Be sure when mounting t...

Page 14: ...e hole threading it into the 4mm blind nut Tighten the bolt until the blind nut is pulled tight against the backside of the firewall Remove the bolt and repeat this for each of the three remaining hol...

Page 15: ...blocks For the top mounting block measure from the front of the fuselage back 1 5 8 40mm and make a line Measure up from the bottom of the fuselage 3 1 2 89mm and make a line intersecting the other li...

Page 16: ...e of drops of thin CA into each of the screw holes to harden the threads Allow the glue to cure 6 Re install the cowl onto the front of the fuselage On the cowl mark the location for the glow plug nee...

Page 17: ...he aileron with two 2 x 15mm 5 8 machine screws and the nylon mounting plate 4 Insert the third rod into the remaining opening on the left side of the fuselage Connect the control horn to the clevis a...

Page 18: ...the outermost hole in the servo arm with a Hobbico Servo Horn Drill or a 48 or 5 64 2mm drill bit Center the elevators and align the wire pushrod with the hole in the end of the servo arm Using a mark...

Page 19: ...ary SET THE CONTROL THROWS Use a Great Planes AccuThrow or a ruler to accurately measure and set the control throw of each control surface as indicated in the chart that follows If your radio does not...

Page 20: ...weight may be added by cutting open the bottom of the fuse and gluing it permanently inside Note Do not rely upon the adhesive on the back of the lead weight to permanently hold it in place Over time...

Page 21: ...with disastrous effect but vibration may also damage your radio receiver and battery Vibration can also cause your fuel to foam which will in turn cause your engine to run hot or quit We use a Top Fli...

Page 22: ...ing demonstrations until it has been proven to be airworthy by having been previously successfully flight tested 2 I will not fly my model aircraft higher than approximately 400 feet within 3 miles of...

Page 23: ...s a great flying model that flies smoothly and predictably The Hobbico Sukhoi does not however possess the self recovery characteristics of a primary R C trainer and should be flown only by experience...

Page 24: ...altitude with plenty of fuel practice slow flight and execute practice landing approaches by reducing the throttle to see how the model handles at slower speeds Add power to see how she climbs as well...

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