.
A standard servo may be used for the throttle. A "Y" harness is necessary to plug the two aileron servos into the receiver. We
also recommend using at least a 1000 mAH battery pack in the model. Be certain that your radio system frequency is approved
for use in R/C model aircraft.
Glues
There are many different glues available today for model construction that it can be confusing to even the experienced modeler.
To simplify matters, most glues can be classified as one of four basic types:
1. Fast cyanoacrylate adhesives (abbreviated in this book as "CA") such as SIG CA, Hot Stuff, Jet, etc ...
2. Easy-to-use water-based glues such as SIG-BOND (yellow) and SIG SUPER-WELD (white).
3. Super strong (but heavier) two-part epoxy glues such as SIG KWIK-SET (5-minute cure) and SIG EPOXY (3-hour cure).
4. Traditional solvent-based model cements such as SIG-MENT.
Each of these types has different characteristics and advantages. Often times, the choice of which type to use is strictly a matter
of personal preference based on your experience with a previous model. However, because of the vast use of Lite-Ply and
hardwoods in the FOUR-STAR 120, we have found that the CA glues seem to work the best for general construction. In fact,
the construction sequence of the fuselage is designed with the use of CA glue in mind. Other glues could be used, but CA is
recommended as our first choice because of its ability to penetrate an already assembled joint. In other words, the fuse parts
can first be assembled dry (without glue), the alignment checked and adjusted, and then the glue can be applied to the joints.
You should also have on hand some epoxy (both 5-minute and slow dry) and SIG-BOND because these glues are called out in
several of the steps in these instructions.
SIG CA, like most brands of cyanoacrylates, comes in three viscosities thin, medium, and thick. Odorless CA's are also
available from several manufacturers. Odorless CA is generally more expensive, but is ideal for people who can't tolerate the
fumes of normal CA. An accelerator spray and debonder are also available and are described below.
Sig CA Thin
- Watery in consistency, thin CA should only be used when the two parts to be joined are in perfect contact
with zero gap. Capillary action pulls this glue deep into the wood resulting in a very strong bond and it dries in just a few
seconds. Thin CA can be used to tack assemblies together, but these joints should be glued again later with medium or
thick CA. Thin CA is also necessary for installing EASY HINGES.
Sig CA Medium
- Our medium thickness CA is excellent for almost any step during construction, and is particularly
recommended for gluing the plywood fuselage parts. The extra thickness allows the glue to fill small gaps, but it dries a
little slower than thin CA. If you want only one type of CA, use medium thickness.
Sig CA Slow
- This thickest formula is good for filling large gaps and building up strong fillets at joints requiring extra
strength. It also dries slow enough to allow you to apply it to one part and position it on another before it dries. (With the
thin and medium CA's, the parts must be in contact and positioned correctly before glue application.) This feature is
useful when laminating large sheeted areas like a fuselage side and a fuselage doubler.
Sig Kwik-Shot Accelerator
- Spraying accelerator on CA (any thickness) will cure it almost instantly. Although CA is
fast, it's sometimes nice to speed it up even more.
Debonder
- This can be used to separate parts, but you'll probably use it for unsticking your fingers more than anything
else!
CAUTION: Some people have experienced allergic reactions when exposed to epoxy or
cyanoacrylate glues. This is very rare. However, it is always important that such glues, and also
paints, thinners and solvents, be used with adequate ventilation to carry fumes away.
You'll Need a Good Sanding Block
An assortment of different size sanding blocks are indispensable tools for model
construction. A good general purpose block can be made by wrapping a 9"x11"
sheet of sandpaper around a piece of hardwood or plywood. Use three screws
along one edge to hold the overlapped ends of the sandpaper. Put 80-grit paper
on the block during general construction. Switch to 220-grit paper for final finish
sanding just before covering.
In addition to the large block, there are places where a smaller one is handy.
Also, a sandpaper "file" can be made by gluing sandpaper to a flat spruce stick or
around a hardwood dowel for working in tight places.
Содержание Four-Star 120
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