RC Factory SU-29 Building Instructions

SU-29
Building instructions
Please read slowly and carefully!
Thank you for purchasing this kit. It was designed to be an extremely aerobatic and agile indoor (or light wind outdoor) model, optimized for the
Aeromusicals category and radical unlimited 3D.
Please refer to the Diagram Sheet while building this model.
You will note, that this time we have made all the necessary cuts for you – no more uncertainty over placement of components. We have
indicated the locations of servos by cutting their holes in "dotted line". The holes are sized with respect to the (arguably) most common type of
servos, the HXT500, Tower Pro SG50, Hitec 50 or JR DS188 size (and surely many more). If you are using these or equally sized types, cut
through the "dotted" lines. If not, customize the holes to your particular servos.
Note: Gluing Depron – there are several different types of glue available. One of them is foam friendly ("styro") CA (Cyano-acrylate). The CA
is often used, admittedly making the parts joint somewhat fragile. Our preferred option is contact glue - one brand tested to satisfaction is foam
UHU-Por. You have to apply the glue on both parts (one trick is to apply more of it to one glued part and to "stamp" this part to the other one to
transfer some of the glue) and wait about 5 minutes, until the glue is almost dry (yet still a bit tacky), then stick the parts firmly together. You
have to be precise; once glued, the parts are very difficult to take apart, such attempt sometimes resulting in damage to one or both of them.
Sometimes polyurethane glue is used where extra strength is required. One such brand is Purex (available in the Czech republic; equivalents
should not be difficult to find). Servos can be also very well glued in by a hot glue.
Any new kind of glue should be always tested on a scrap piece of Depron... you never know...
Note#2: To cut Depron, use a very sharp hobby knife (and a steel straight edge). Depron tends to wear out the edge of the knife quite fast –
change your blades often.
Ok, let's start the building...
First, glue the 2 carbon strips (3 x 0.5 x 80mm) into the elevator.
Diagram 1 - 2
Cut a bevel to all edges where elevator meets the stabilizer and ailerons meet the wing (always to both facing parts). The controls are to be top
hinged (so make sure which side is the upper side of the respective part)! Attach the controls using clear adhesive tape (we recommend priming
the Depron under the tape with a thin layer of contact glue and we like the 3M clear, highly adhesive 15 mm tape). Be sure that your tape holds
well on Depron (try on scrap piece first). In case of the elevator, the hinge tape shuld be interrupted in the area of the elevator horn slot (for easy
insertion of the horn later).
It is important to keep at least 0.5 mm separation between the parts (you can "see through" the hinge), this will help you have a very easy
deflection without twist to the parts and strain to the servo.
Dry assemble the horizontal part of the fuselage (the aft part of the "backbone" now alrady with elevator attached) and the wing halves on a
straight building board. The wings are "upper side – up", i.e. not inverted. You can see that the backbone fits the wings in only one way – it is
not symmetrical. Glue the wings to the fuselage. Using UHU Por or similar glue, attach a flat carbon strip 3 x 0.5 x 780 mm (shorten the
included strip as necessary) across the whole leading edge of the assembly. Finally, glue the front (nose) part of the backbone to the assembly,
making sure that it is perfectly aligned with the aft backbone.
Diagram 3
Now is a great time to beef up your plane a little bit for higher survivability. If you are like us, you will keep pushing the envelope and
occasional crash is in such case almost certain. By smart strategic placement of few pieces of clear tape (ideally the highly adhesive 3M tape or
similar, with the 3M you do not even have to prime the Depron with contact glue first), you will make your plane last much, much, much longer
(and you will not have to go shopping with us again too soon... sadly ☺).
Ok, the Diagram should give you the idea where to place the tape. Do the same from both sides – top and bottom. Exact placement is not too
critical.
Diagram 4
Turn the whole thing upside down. Glue one carbon strip 3x0.5x80 mm to the bottom side of elevator as indicated. Glue the lower part of the
fuselage to the backbone. Install the strut anchor (small cf part, as per the Diagram – first sharpen one 1x30 mm carbon rod, push it into the
prepared – partially precut – location in the lower fuselage leaving some 2mm in the open, and glue the anchor on top of this rod).
Glue the two Depron strut supports into the wing. Locate 4 carbon rods of 1mm diameter and 250 mm in length. These will make the wing
struts. Install them as per the diagram, one end into the wing (there are precut slots) and the other end should rest easily in the corresponding slot
in the strut anchor – going on their way through a slit in the strut support. Make sure that the wings are flat on the building board and that the
fuselage is perpendicular to the wing plane. If you are satisfied, glue the struts into the wing (styro CA or better Purex, this time no Uhu Por) and
into the strut anchor (styro CA or, if you are careful, non-styro CA). Check three times before using the glue, remember that you are fixing the
future geometry of the model!
Diagram 5
Locate the two aileron strut supports and insert two sharpened carbon rods 1 x 30 mm into the precut (dotted line) location, leaving cca 5 mm out
and gluing them into place. Complete the aileron bracing, using 0.8 mm carbon rods – cut them to pieces as necessary. Glue them into the
aileron in the precut slots and on the other side to the free part of the 1mm carbon on top of the supports.
Finish the complete bracing of the fuselage, using 0.8 mm carbon and CA glue. Move from front to back, beginning in the strut anchor. Keep
checking the geometry of the whole plane.
Diagram 6
Locate the two 1,5 mm carbon rods – those are your landing gear legs. On one end, CA glue the wheel axle joint as per the diagram. Find the 15
mm long pieces of 1,5mm carbon and glue them into the elongated hole in the joint. The angle of the axle should be 135° with respect to the gear