RBCkits Yak 23
Instructions Yak 23
Wings:
Start by making the wingsheeting from the 1,5mm balsa sheet, cut out the sheeting as the wing planform and join
the sheeting with ca.
Draw up all formers and ribs onto the sheeting with a soft pencil.
Place the formers and ribs onto the sheeting and pin down MF1, now glue FM1 onto the sheeting with thin ca.
Glue MF2 onto MF1
Line up the ribs with the lines on the sheeting and FM1 and glue one rib at the time onto FM1, now carefully
glue the ribs onto the sheeting, you may roll the ribs to the sheeting, and ad up glue.
Now glue the nose underside of the ribs onto the sheeting, the same way as the back part.
Place the false leading edge.
Place the trailing edge and place the 6mm Aileron leading edge.
Make up the other wing side at the same way also place R0
Sand the false leading edge and the ailevon leading edge to match the curve of the ribs.
Place scrap balsa for servo and control horn, servo wire, servo.
It is now easy to cut small openings at the ailerons circumfarings, when sheeting is applied it is easier to cut out
the ailerons.
Make carefully the small openings in the wing underside for taking formers DF2 and DF3
Make up the “WING WASHOUT HELPFORMER’ from 7x5 balsa.
Place the helpformer under position X1 and X2 as per plan and pin down
Also pin down MF1 at the outer positions, so the wing sheeting can be applied.
Sheet the wing with the pre fabricated sheeting, makes sure not to warp it.
Place leading edge from 6x12 balsa.
Sand leading and trailing edge to shape as per plan.
The centre of the wing is open at the underside aprox as per plan, this is necessary for taking the fan unit and
exhaust ducting
Cut out the aileron and sand to shape as per plan, we use tape as hinges.
The servo wire is Z-bended at the servo and going straight to the aileron, there the wire is bended 90 degree into
the control horn, use a small piece of white inner cable to secure the wire.
The other wing half is prepared on the same way.
Sand of the middle part of the wing centre for taking DF0
Fuselage.
Pin down the main crutch FMC at flat building board.FMC is in 2 parts joined.
Place formers F1-F9, TF1 one by one, Place F16, place F4D, place WF1,WS1, place F17.
Check alignment of the formers,
Place the 2x6 balsa stringer at the tailbottom
Sand flush all stringers with the formers.
Place 1 layer of 3x50 balsa bottom sheeting and sand into the contour of the formers F7-F9, TF1
Paint and cut out the inlet duct and carefully place into fuselage, Glue the paper duct to the formers.
Make the battery compartment from 3x57x200 balsa and 2x 2x33x200 balsa and the 10x10 triangle stock.
Now start sheeting the fuselage with the 2x12mm balsa strip, start at the top of the fuselage, and work your way
to the bottom, one at the time, all strip should be tapered from tip to tip, try every time will give best fit and most
strength.
When bottom is sheeted, sand flush the fuselage tail bottom layer of 3mm balsa and sheet with a next layer of
3mm balsa. Sanding can be done in a later stadium
Take of fuselage and sand FMC to the contour of the formers.
Place top formers as per plan place 2x6 balsa stringers on top and sand flush with the formers
Place rudder assembly on fuselage, make sure for straightness
