KAVAN Cumul DLG ARF 1096mm - Instruction manual

Introduction

Precautions

This RC model is not a toy. Use it with care and strictly following the instructions in this manual.

Assemble this model following strictly these instructions. DO NOT modify or alter the model. Failure to do so, the warranty will lapse automatically. Follow the instructions in order to obtain a safe and solid model at the end of the assembly.

Children under the age of 14 must operate the model under the supervision of an adult.

Assure that the model is in perfect conditions before every flight, taking care that all the equipment works correctly and that the model is undamaged in its structure.

Fly only in days with light breeze and in a safe place away from any obstacles.

Caution: This RC model you will build and fly is not a toy! Although it may seem to be light and slow in flight it is capable of serious bodily harm and property damage. It is your responsibility and yours alone - to build this model correctly, properly install RC equipment and motor and to test the model and fly in accordance with all safety standards (and common sense) as set down in Safety Codes valid in your country. If you are just starting RC modelling, consult your local hobby shop or an experienced modeller in your local RC club to find a good instructor.

You must build the model according to the instructions. Do not alter or modify the model, as doing so may result in an unsafe of unflyable model. Take time to build straight, true and strong. Use proper radio and other equipment that is in first class condition, properly install all the components and test their correct operation before first and any further flight. Fly the model only with competent help from a well experienced modeller if you are not already an experienced RC pilot.

Note: We, as the kit manufacturer, can provide you with a top quality kit and instructions, but ultimately the quality and flyability of your finished model depends on how you build it; therefore we cannot in any way guarantee the performance of your completed model, and no representations are expressed or implied as to the performance or safety of your completed model.

Specification

Wingspan	1096 mm
Length	880 mm
All–up weight	180 g
Wing section	YA 0801
CG position	65–70 mm
Controls	Rudder, elevator

Recommended RC equipment

Rudder and elevator servo: KAVAN GO-6MG 2×
Receiver battery: 1S LiPo 3.7 V 450–500 mAh

Recommended glues

Unless stated otherwise, use medium cyanoacrylate (CA) glue (KAV56.9952 KAVAN Power CA Medium). The highly loaded parts (wing joiner etc.) should be glued together using 30 minute (or slower) epoxy (like KAV56.9967 Epoxy 30min) offering high strength and enough time for the correct positioning.

Tools and accessories

Very sharp modeller’s knife (e.g. Excel 16001 with no. 11 blades)
Scissors
Electric drill with drill bits
Wire cutter
Long nose pliers
Screwdrivers
Razor saw
Sandpaper no. 180–220, 360–400
Needle files
Soldering iron and solder
Modeller’s pins
Epoxy mixing stick and vessel
Masking tape, clear sticky tape
Rubbing alcohol (for cleaning up excessive epoxy)
Paper tissue or soft cloth (for cleaning up excessive epoxy)
Straightedge with scale
Square edge
Thin clear plastic film (for protecting the building plan/workbench)
Permanent marker
Hot melt glue gun & hot melt glue

Model assembly

Wing

Locate the W1 and W2 riblets, W34 wing joiner and W32 wing bolt plate. (Fig. 2)
Sand lightly the edges of all the parts; trial fit the wing joiner W34 - it has to go all the way into the respective bays in wing halves easily - sand the joiner slightly or trim the bays using a fine needle file if necessary.
Using a very sharp pointed modeller’s knife remove the covering film over the notch for the W32 wing bolt plate near the trailing edge of the wing halves. Slide the wing panels onto the W34 wing joiner. Insert the W1 and W2 riblets between the root ribs and the W32 plate into the notches in the wing panels and W2 riblet. Secure the wing panels using strips of masking tape. Attach the wing to the fuselage to check the alignment pin of the W1 riblet engages correctly into the corresponding slot in the fuselage and the hole in the W32 plate matches the position of the captive nut pre-installed in the fuselage. (Fig. 3)
Once you are satisfied, use 30 min epoxy to glue the W34 wing joiner in place as well the W1 and W2 riblets aligned to match the wing root rib. (Fig. 4)
Put the wing half with the wing joiner glue in on your workbench (protected by a sheet of plastic film) so the alignment pin of the W1 riblet protrudes over the edge of the table; then epoxy the other wing panel. Be sure the trailing edges of both wing panels match perfectly. (Fig. 5)
Epoxy the W32 wing bolt plate in place. Once the glue has cured drill the hole for the wing bolt using 3.2 mm (1/8”) drill bit. Finally, apply a strip of clear sticky tape over the wing centre joint. (Fig. 6)
Epoxy thoroughly the carbon discus launch pin into the left (for a right-handed pilot) or right (for a left-handed pilot) wing tip. (Fig. 7)

Fuselage

Using a very sharp pointed modeller’s knife, cut the covering film over the opening for the tailplane pylon in the horizontal stabilizer and over control horn slots in the elevator and rudder. Cut the small slots for the Kevlar® thread in the fin - refer to Fig. 9.
Use a fine needle file to trim the pre-cut slots for the horizontal tailplane pylon, fin and elevator and rudder push rod exits in the carbon tube tail boom. Use round fine needle file to make a groove for the rudder push rod tube in the tailplane pylon F22. (Fig. 8)
Insert the tailplane pylon F22 into the tail boom - no glue yet. Insert the fin and rudder assembly into the notch in the end of the tail boom and tack glue it to the tail boom. Bind the fin to the tail boom with a Kevlar® thread threaded through the slots in the fin. (Fig. 9)
Slide the horizontal stabilizer on the F22 tailplane pylon; align it square to the fin and to the longitudinal axis of the tail boom and tack glue it to the pylon. Double-check the correct alignment; once satisfied, apply a generous amount of cyano along all the joints and onto the Kevlar® thread. Insert the elevator and rudder push rod outer tubes into the tail boom. Secure them with a piece of polyurethane foam soaked with epoxy that you will work into the centre of the tail boom with a thin stick. This is great for a precise, slope free elevator and rudder control. (Fig. 10 + 11)
The servo mount supplied in the kit has been tailored for the recommended KAVAN GO-6MG servos. Whatever type of servos you are going to use, always check if the openings won’t need a bit of trimming first. We recommend soaking the edges of the servo openings with cyano. Once satisfied, glue the servo mount in place (the servos are to be fitted in the up side down position). (Fig. 12+13)
Thread the protruding ends of the elevator and rudder push rod outer tubes through the holes in the rear servo compartment former so the tubes lead directly to the horns of servos in the servo mount. Insert the tail boom into the fuselage - no glue yet. (Fig. 14)
Attach the wing to the fuselage and secure with the M4 bolt. Looking from above, front and rear check the fuselage and tail boom are straight and the wing dihedral makes a nice symmetrical "V" in relation to the horizontal stabilizer. Once satisfied cut the push rod outer tubes to the correct length and epoxy thoroughly the tail boom into the fuselage. Double check the correct alignment before the glue sets.
Solder the M2 brass threaded couplers on one end of the 0.8 mm piano wire push rods. Screw the ball links on and slide the push rods into the respective outer tubes. Secure the ball links to both two servo arms with the M1.6 screws supplied in the kit. Insert the fibreglass control horns into the slots in the elevator and rudder - do not glue yet. Set the servos to the neutral with your radio on. Attach the servo arms square to the side of the servo case. Set the elevator and rudder flush with the horizontal stabilizer resp. fin. Mark the correct length of the push rods and bend them to the right angle (you can make a "Z-bend", but the simple L-bend usually works well enough). Insert the L-bends into the holes in control horns and cyano the horns into the elevator and rudder still set in the neutral position. Finally, secure the servos with drops oh hot melt glue, silicone or MS polymer glue in the servo tray. (Fig. 15+10+11)
Glue the F14 locking plate to the front of the servo & battery compartment hatch; the locking plate has to match the position of a notch in the fuselage side reinforcement plate; the hatch has to match the opening in the fuselage side. Epoxy the pair of magnets F15 into the hatch and fuselage. Double-check their polarity - they have to cling to each other! For easy removal, apply a strip of folded sticky tape to the rear edge of the hatch. (Fig. 16+17)
Install your receiver into the fuselage under the wing; the receiver battery will go into the nose.

Tow hook

Install the tow hook in the plywood tow hook plate - drill through one of the pre-drilled holes using 3.0 mm drill bit. It should be positioned about 5 mm in front of the centre of gravity. (Fig. 18)

Recommended control surface throw, CG position

CG Position: 69–72 mm (Fig. 19)
Rudder: ±25 mm
Elevator: ±10 mm
Discus launch configuration: rudder -1 mm against the direction of the launch (right-handed - rudder 1 mm right), elevator 1 mm down.

Note: Use this configuration for the climbing phase of the discus launch only; and only after the model has been trimmed out properly and you‘ve made yourself familiar with the controls.