Summary of Contents for Carf-Models Composite-ARF YAK 55SP
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Page 1: Instruction Manual
Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Instruction Manual Composite-ARF YAK 55SP, 3m TAVS Technology Version: 1.0... - Page 2 However, as manufacturers, we at CARF-Models Co. Ltd. are not 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.
- Page 3 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com function correctly and safely. You, as operator of the model, must rely upon your own expertise and judgement in acquiring and operating this model. Supplementary Safety Notes Pre-flight checking: Before every flying session check that all the model’s working systems function correctly, and be sure to carry out a range check.
- Page 4 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Leave the transmitter antenna retracted, and check the distance you can walk before ‘fail-safe’ occurs. Then start up the engine, run it at about half throttle and repeat this range check with the engine running. Make sure that there is no range reduction before ‘fail-safe’ occurs. Only then make the 1st flight.
- Page 5 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com tage, if you set in about 10% NEGATIVE aileron differential in your transmitter program. This means that the ‘down’ Centreline of hinge axis throw needs to be about 10% more than the up throw.
- Page 6 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com No glue joint needs to be stronger than the materials that it is attached to, as it would just result in increased weight for no advantage. The landing gear is a well proven design, taken from our 3.3m Yak, and the slight flexibility helps to...
- Page 7 Accessories Below are the things you may need to get your Composite-ARF Yak 55SP in the air. Some of them are mandatory, some of them can be chosen by you. What we list here are highly recom- mended parts, and have been thoroughly tested.
- Page 8 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Tools This is a very quick and easy plane to build, not requiring difficult techniques or special equip- ment, but even the building of Composite-ARF aircraft requires some suitable tools! You will probably have all these tools in your workshop anyway, but if not, they should be available in all good hobby shops, or hardware stores like "Home Depot"...
- Page 9 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com have been missed. When sanding areas on the inside of the composite sand- wich parts to prepare the surface for gluing something onto it, do NOT sand through the layer of lightweight glasscloth on the inside foam sandwich. It is only necessary to rough...
- Page 10 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Building Instructions General Tips: We recommend that you follow the order of construction shown in this manual for the fuselage, as it makes access to everything easier and saves time in the end. The wings and stabs can be done at almost any point, and only need servos installing anyway.
- Page 11 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Fit the wheelpants to the legs as follows: Set the fuselage on a level surface with the tail- wheel (optional tailwheel assembly available from C-ARF) in place. Drill a 6mm Ø hole centrally right thru’ the rounded part of the wheelpant.
- Page 12 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Tailwheel The tail wheel unit shown is an optional part available from C-ARF (# 801001), and is mounted with 4 sheet metal screws and 4 plastic ‘U’ brackets under the fuselage, screwed into the plywood reinforcement that’s installed in the fuse-...
- Page 13 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com cut for you, and the upper 4 vents should not have cutouts - in effect they are just ‘dummy’ vents. This is so that all the air coming in through the front of the cowl must go thru’ the engine cylinder fins and out of the lower vents for the most efficient cooling effect.
- Page 14 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com (below) Duct-tape handles used to pull the Unless you are in a very warm room, we rec- clear canopy against the canopy frame while glu- ommend that the canopy is slightly warmed ing it in position with a few small drops of odor- up with a hair dryer to prevent cracking, but be less-CA.
- Page 15 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Horizontal Stabs The stabilisers are finished at the factory, and only need the servos and linkages installing. Insert the Ø 20 x 435mm long aluminium tube spar in the fuselage sleeve, and slide on both stabs.
- Page 16 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com The 3mm thick plywood inner rib in the stabs is already milled with a cutout to suit the JR8711/881 servo, but it is mandatory that the very powerful stab servos are screwed into 6mm thick plywood, using the Ø 2.9 x167mm long screws provided.
- Page 17 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com between the dual phenolic elevator horns using the M3 x 20mm allen bolts and lock-nuts provided in the hardware pack. Add a drop of Loctite for extra safety. It is allowed to fit a single-sided ball-link onto the metal...
- Page 18 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Servo Choice The milled composite rudder tray is designed for 3 JR servos (8511/8611) or better. If using Futaba you can also fit the large S9152 ser- vos, although you will need to sand about 2mm from the edges of the servo rails.
- Page 19 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Due to the manufacturing tolerances of the phenolic material you may find that you need to sand small dimples in the top surface (only) of the phenolic arms where the steel clevises are fit- ted, to make sure that they close com- pletely and have free movement.
- Page 20 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Wings The wings are 95% finished at the factory, and have already been installed on your fuselage to set the alignment. Dual phenolic aileron horns are already pre-installed for you at the factory. Slide the wings onto the 50mm diam-...
- Page 21 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com installed at the back of the inner phe- nolic mount and the other in the outer mount. For the ultimate response fit three x JR 8511/8611 or 8711/8811 servos. Futaba: We strongly recommend that you only install 3 servos, not 2.
- Page 22 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com already the correct thickness for the M3 alu- minum clevises provided. Drill out the thread- ed holes in the SWB arms to 3.0mm diameter for the clevise pins, and apply a little grease to the hole to make sure there can be no binding of the Ø...
- Page 23 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Engine Installation We strongly advise you to complete the motor and exhaust installation before the fuel tank base and the vertical former at the back of the landing gear mount plate are installed, as it pro- vides much easier access.
- Page 24 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com tal hole centres of 80mm and vertical centres of 90mm, so mark these offsets either side of the motor centreline as shown. Drill the 4 fixing holes Ø 6mm, and secure the motor to the fire- wall using the M6 x 55mm bolts, and the T-nuts against the inside face of the firewall.
- Page 25 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Exhaust Cooling Remove the canisters and turn the fuselage over so that you can cut out the air exit holes underneath. These should be minimum 150mm long and 45 wide, with radiused cor- ners to prevent the composite sandwich tearing. Leave at 50mm space in between the 2 holes, where the carbon join- ing tape is, for strength.
- Page 26 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com (below) Simple 1.5mm plywood you will overheat, and damage, your valuable motor. baffle to improve motor cooling. Depending on your motor you will definitely need to make some sort of baffle to force the air through the cooling fins, and this can be made from scrap 1.5mm plywood or 3mm...
- Page 27 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Landing Gear support bulkhead After you have completed the fuel tank base, and glued it into position you must glue in the plywood upper landing gear support bulkhead - which transfers some of the land- ing loads throughout the fuselage.
- Page 28 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com the ignition system. The 4-cell pack for the DA-150 is secured inside the fuselage against the front left side of the motor dome with cable-ties on a foam isolation pad. Receiver Batteries The prototype Yak is fitted with two 5 cell NiMH Rx packs of 2400mAH each, and a 4 cell 2400mAH ignition pack, and the ready-to-fly weight is just under 18.5 kg (40.5Lbs).
- Page 29 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Servo Extension leads etc. Please make sure that you use good quality twisted-cable extension leads, of heavy gauge wire with gold-contact connectors, to all the servos. If you are using a ‘Powerbox’ this unit is already fitted with all the ceramic chokes. Also no ‘Y’...
- Page 30 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com close to the engine as possible - because of the length of the HT leads that connect to the spark plug(s). Mount it on a foam pad and secure with cable-ties, to the top surface of the motor dome immediately behind the engine as shown on page 22.
- Page 31 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Are the swages crimped up nice and tight on the rudder cables? For added security add one small drop of loctite/thread locking compound on all the bolts that hold the servo arms to the servos, especially important with digital types.
- Page 32 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Elevator high rate: 130mm (max.) On high rate the elevator should really be at low rate: 50mm maximum, up to 50 degrees both sides (approx. 130mm), but in this case with 50% exponential. Low rate should be no more than 50mm (2") both sides.
- Page 33 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com ly off. The aileron control surfaces have enough torsion flexibility so that damage to the servos should not occur. Flying the Yak 55SP The Yak has proven to be a very neutral flying airplane. It also maintains a very constant speed in ‘up’...
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Page 34: Kit Contents
Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Appendix Yak 55SP 3m Kit (Version 1.0) Kit Contents Quantity Description Fuselage Wing, right (with servo hatch taped in place) Wing, left (with servo hatch taped in place) Stab, right Stab, left Elevator, right... - Page 35 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Wing Pack (2 sets) Quantity Description Allen bolt, M3 x 20 (to secure ball-links to aileron horns) Stop nut M3 (to secure ball-links to aileron horns) Clevise, aluminum M3, with Pins and E-clips (linkages to servo arms)
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Page 36: Available Accessories
Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com Available Accessories: Tail gear setup with 35mm Ø wheel, size ’XL’. (product #801001) Desert Aircraft DA-150 motor (product #951000) Canister set for DA-150 (product #910150) PowerBox 40/24, dual NiCad crossover unit. (product #960200) PowerSwitch, pair, 20A, for dual NiCads (product #960300) Please check our website : www.composite-arf.com, for current availability of options and accessories. - Page 37 Composite-ARF YAK 55SP (3m span) techsupport@composite-arf.com (above) Contents of Fuselage hardware pack Contents of Stab Hardware Contents of Wing Hardware pack (2 sets) pack (2 sets) (above) Contents of Rudder (above) Contents of Spare Hardware pack Hardware pack (above) Contents of Milled wood and Phenolic pack...