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About the Yak 55SP 2.1m (83”)

The 2.1m Yak 55SP flies like a pattern plane, but on top of this it has enormous 3D-capabili-
ties. It’s bigger than one would think, and it feels much bigger than 2.1m span, which is due to
the deep chord of the wing. This also requires a powerful engine, and we found that it is defi-
nitely a larger plane than the 2.1m Extra. But that's not bad news, that’s great news. A plane,
easy to store and transport, well powered with a 50cc engine, flying like its’ 2.6m brothers. Just
like it.

It tracks great and doesn't need any knife edge mixes. The control authority can be perfectly
adjusted to everyones preference. It is the plane which can move you several classes up in
the IMAC scene because of its’ unbelievably smooth and neutral characteristics. It does what
you want, not vice versa.

For 3D the large wing and the large control surfaces do the trick. The most impressive
maneouvers can be flown very easily. It feels light and large, agile and responsive. There is
nothing that the 2.1m Yak can't do. Moving batteries to shift the CG to your liking is easy
because the plane is not CG critical at all. It balances well right out of the box.

Landing speed is very slow, and it feels like on rails during the approach. The high landing
gear is not a disadvantage at all, it fits the touch down angle of attack perfecty and does not
tend to bounce.

There is no better 2.1m plane on the planet. That's what we at CARF Models are convinced of,
and we are ready to prove it to you and your fellow modellers....

Did you read the hints and warnings above and the instructions carefully?

Did you understand everything in this manual completely? 

Then, and only then, let’s start assembling your Composite-ARF Yak ...

Composite-ARF Yak 55

(2.1m/83”)

[email protected]

8

A view of the complete Yak 55SP 2.1m (83”) kit contents.

Star scheme Blue/White - Product 

#742000

Summary of Contents for Yak 55SP

Page 1: ...techsupport composite arf com Composite ARF Yak 55 2 1m 83 Instruction Manual Composite ARF Yak 55SP 2 1m 83 TAVS Technology version 1 0...

Page 2: ...in a position to influence the way you build and operate your model and we have no control over the methods you use to install operate and maintain the radio control system components For this reason...

Page 3: ...systems function correctly and be sure to carry out a range check The first time you fly any new model aircraft we strongly recommend that you enlist the help of an experienced modeller to help you ch...

Page 4: ...er damage The low mass of all the parts results in a low physical inertia and any excess vibrations can affect the servos and linkages General Information about fully composite aircraft structure All...

Page 5: ...se are already set in the molds so that no adjustment is necessary The all composite combined firewall and exhaust tunnel is factory installed and aligned for your convenience and contributes greatly...

Page 6: ...mills 10 Sandpaper various grits and Permagrit sanding tools high quality 11 Carpet bubble wrap or soft cloth to cover your work bench most important 12 Clear Car wax polish for protecting painted are...

Page 7: ...we list here are highly recommended parts and have been thoroughly tested 1 Power servos min 5 We highly recommend JR 8511 8611 s or Futaba S9351 s for the ailerons elevators rudder 2 3 metal servo ou...

Page 8: ...the large control surfaces do the trick The most impressive maneouvers can be flown very easily It feels light and large agile and responsive There is nothing that the 2 1m Yak can t do Moving batter...

Page 9: ...t with alcohol or similar before gluing to make a perfect joint It is very important to prepare the inside of the fuselage properly by roughing up and cleaning the surface before gluing any parts to i...

Page 10: ...dimple in the bottom of the carbon legs and then fit the carbon legs into the molded recess on the back of each wheel pant and drill 4mm thru the wheelpant also using the hole in the leg to ensure cor...

Page 11: ...ethods of securing the canopy frame to the fuselage However we highly recommend that you use the method shown here using 4 plywood tongues secured with M4 bolts and T nuts as it is rat tle free resist...

Page 12: ...st a little very thick 30 minute epoxy and micro bal loons mixture Be careful that the epoxy doesn t seep thru the slots and glue the frame to the fuselage When cured remove the canopy frame and reinf...

Page 13: ...rops can be cleaned up with water before it cures Whichever method you chose make sure to bolt the canopy frame in it s final position on the fuselage while the canopy glue dries to ensure that it can...

Page 14: ...ide against the fibreglass flange Apply one drop of thick CA to each T nut to hold in position then remove the cowl carefully and secure properly with some 30 min epoxy and micro balloons mixture You...

Page 15: ...The elevators can travel more than 45 degrees and if you are going to use the maxi mum throw for 3D manoeuvres we strongly rec ommend hi torque digital servos like JR8411 8511 8611 or Futaba S9351 It...

Page 16: ...just the position of just one of the slots slight ly forward or backward as necessary so that the clevise holes in the horn are exactly perpendicu lar to the hinge axis when the elevator is in the neu...

Page 17: ...100mm out from the root of the stab thru the bottom surface the ply reinforce ment the fibreglass sleeve and the bottom of the carbon tube Tap the hole M3 Remove the carbon tube and glue in the M3 T...

Page 18: ...e Yak which definitely needs a hi torque power servo of at least 12kg torque and we recommend the digital JR Graupner 8511 8611 8811 or Futaba S9351 for this very important control surface The servo i...

Page 19: ...p at the front that goes over the hooks on the output arms and a quick link with turnbuckle and locknut at the rudder end We cross the wires over in the fuselage as then the exit slots are further bac...

Page 20: ...evator horns making sure that the clevise holes are perpendicular to the hinge axis which is about 3mm behind the slot in the bottom of the wing skin As before we advise you to fit just one horn first...

Page 21: ...x 10mm Finally make up the linkages from the M3 x 45mm threaded rods supplied with 2 clevises and 2 x M3 locknuts for each Important The clevise should be on the inner hole of the servo extension arm...

Page 22: ...ack of washers between the back face of the motor stand offs and the front of the plywood firewall The firewall consists of 2 milled 3mm plywood sheets The larger one must be glued to the inside of th...

Page 23: ...move the front firewall from the fibreglass bulkhead and rough up and clean the gluing surfaces of both ply firewalls and both surfaces of the black fibreglass Now glue both plywood firewalls into pos...

Page 24: ...d and these are available as an optional set from Composite ARF as well as the DA 50 This com bination gives the engine a nice throttle response a perfect mid range and increases top end power slightl...

Page 25: ...ations transferred to the airframe Glue the 2 small ply doublers to the ends of the pipe support which will take the 2 sheetmetal screws for the spring that secures the pipe Screw in the sheetmetal sc...

Page 26: ...rtical back face The photos show how the parts are assembled and the completed unit is then glued on top of the fibreglass wing spar tube in the centre of the fuselage with epoxy and micro balloons mi...

Page 27: ...filling close for flight Throttle servo Included in the kit is a CNC milled plywood throt tle servo mount and you can fit this in any suit able position for your motor set up However we strongly advi...

Page 28: ...e motor ignition battery ignition switch and gas engine ignition unit as far away as possible from the Receiver and Antenna Batteries and Switches As this model has 5 or 6 powerful digital servos we h...

Page 29: ...l to fix all your batteries securely Make extra sure that no fuel tubes or cables can come in contact with hot exhausts Fuel proofing If fitting a gas or glow motor we highly recommend that you protec...

Page 30: ...plane you can move it backwards up to 15mm but this is definitely a 3D Freestyle CG setting and should not be used for the first flights With this rearward CG you will need to use the high rate contr...

Page 31: ...s Aileron throw for high rate is 55mm up and down Use at least 30 exponen tial for high rate For low rate you should decrease the throw to the top to 35mm and the bottom to 38mm Yes this is a reversed...

Page 32: ...or 1 Rudder 1 Cowling 1 Canopy Frame 1 Clear Canopy 1 Pair wheel pants 1 Pair landing gear legs carbon 1 Aluminum Wing tube 30 x 1 4 x 790mm wing spar 1 Carbon Stab tube 14 x 1 x 275mm stab spar 1 Set...

Page 33: ...s 2 Allen Bolts M3 x 12mm to secure stab tube into stabs 2 T nuts M3 to secure stab tube into stabs 2 M3 washers for stab securing bolts 8 Sheetmetal screws 2 9 x13mm to attach servos to plywood mount...

Page 34: ...Composite ARF Yak 55 2 1m 83 techsupport composite arf com 34 Standard Wood parts included in the kit Standard Hardware included in the kit Version 1 0 Mike C 14 Dec 2007 Mac...

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