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Sanding Blocks
The instructions will call for you to sand some parts of the model using a "sanding block", which is simply a piece of
sandpaper backed up by a solid, flat block of wood, plastic, or whatever. A sanding block will give you a much flatter, truer
result than you would get with an unbacked, limp piece of sandpaper held in your fingertips. An assortment of different size
sanding blocks are indispensable tools for all model construction. There are many styles of commercially made sanding
blocks available in hobby shops, or you can make your own.
A good general purpose sanding block can be made by wrapping a full-size
standard 9"x11" sheet of sandpaper around a piece of hardwood or plywood, as
shown below. This is the most commonly used sanding block in our workshop!
Use screws or thumbtacks along one edge to hold the overlapped ends of the
sandpaper in place. Put 80 grit sandpaper on the block during general
construction, and then switch to 220 grit sandpaper for final sanding just before
covering (or make yourself two of these blocks, one for each grit sandpaper).
There will be other times when a slightly smaller sanding block is easier to
manage. Also, you can make a small sandpaper "file" by simply gluing a strip of
80 grit sandpaper onto a scrap plywood stick. Sandpaper glued or taped to
different size hardwood dowels are great for sanding inside curves and holes.
Last but not least, for sanding really large areas, glue 80 grit sandpaper onto a 24" or 36" long piece of aluminum "channel"
or "T-Bar" stock (most hardware stores carry a rack of aluminum extrusions in various sizes and shapes).
How To Use These Instructions
Like a full-size airplane, the KADET LT-40 is built by first constructing several basic structures - the FUSELAGE, WINGS,
STABILIZER, FIN, etc. - which are then assembled into a completed airplane. These instructions will take you step-by-step
through the construction of each basic structure and then the final assembly.
How To Use The Plans
There are two sheets of Plans included in this kit. The plans will be used in several ways. They will help you identify all the
parts and determine the relationship of all the parts to each other. They will also be used as a building pattern for the Wing
Panels, Stabilizer, and Fin - which will be assembled directly on top of the plans. The plans also show how we would install a
typical radio and engine in the KADET LT-40. By referring to the examples shown on the plan, you should be able to properly
install your radio and engine, even if they are not exactly the same as what is shown on the plan.
Everything on the plans is drawn FULL-SCALE, or ACTUAL SIZE (except for the Wing Front view which is half-size) to show
the correct size, shape, and relationship of all the parts to each other.
The plans show the model completely assembled. Unfortunately this often
covers up the important parts inside the model, making it hard to understand
how things fit together. In normal drafting practice, parts hidden inside the
model would be shown with dashed lines, and you will find many areas of the
plan that do use this method. However in areas where there are so many
hidden parts that it would be confusing to use so many dashed lines, we have
elected to use "cutaway views". Cutaway views make it appear as if a portion
of a part has been cut out and removed. This is done to clearly show the parts
that are immediately under the cutaway part. For instance, on Plan Sheet 1
we have used a cutaway to completely remove almost all of the left fuselage
side (starting between Formers F4/F5 and going forward) so that the details
inside the fuselage could be clearly seen. On Plan Sheet 2 there are several
small cutaways in the wing sheeting to allow details underneath to be clearly seen.
NOTE: The cutaways on the plan do not mean that the parts should actually be shaped that way!
Whenever building a structure directly on top of the plans (like the Wing Panels, Stabilizer, or Fin), you must first tape or pin
the plan onto your building board and then cover it with a layer of wax paper. The wax paper will keep excess glue from
sticking the model parts to the plans. As you add parts to the structure, any parts which naturally come in contact with the
plans should be firmly pinned to the plan/building board with T-Pins. Take a look at the photos in these instructions of the
wing construction and you will see what we mean. In the pictures you will see that lots of T-Pins have been used to anchor
the parts firmly in position on the plans.
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