In order to understand why our composing models are so light and strong and what is the difference between our construction and technology differs from the traditional let's consider the forces that influence the wing in a flight and which parts of the construction take them up.

During the flight the wing of a model is influenced by aerodynamic forces that curve and twist it. In the construction of a built up wing curving forces are taken up by the spar and the twisting ones by the D-box construction. D-box is a tube in a letter D form in front of the spar. The back parts of the rib pass the load from the flaps and the wing skin to the D-box and the spar, that's why they must also be hard and strong enough.

Now very few is left to be done. It's just to make all the elements of the construction extra light and extra strong to achieve the needful for an ambitious flight stability.

I'll tell you how we manage with this "easy" task…

We use special technology for strengthening the spars in the models. To achieve the most strength we prepare the plates of carbon with special epoxy for spars. Carbon fiber is a micro pipe. That's why it is necessary to use special solvents for epoxy to saturate carbon fiber better. We use the so called prepeg gluing technology, which is widely used in the aircraft industry. Carbon is first imbued with epoxy which doesn't polymerize at the room temperature, then the needful quantity of layers and the plate are put into the form. When this form is put into the stove there appears an excess pressure of about 30Bar and at the temperature 150⁰ C the epoxy polymerizes.

We create pressure to the carbon by screws and in addition silicon expands
and create pressure of 30-50 Bar.

Thus received plates we glue to the balsa cut in vertical direction with epoxy in vacuum.
Then we cut this plate according to the needful sizes of the spare width and mould a place for the joiner in the matrix, wrapping it up with carbon rowing.
In order to increase reliability the ready-made spar wound around with the kevlar thread. In this way we achieve high strength and inflexibility by the minimal weight of the spar.

We make carbon pipe for the wing joiner than polish it with the sandpaper, glue into the spare or laminated this hole in mold as for Graphite 2 and wind around
with the kevlar thread.

The D-box coating, which is to take up the twisting forces, we make of Kevlar-carbon fiber which we place at angle of 45. This covering is produced according to the same prepeg technology as a very thin film.

D-box and landing edges for Graphite and Simply the best we make using the same technology.

This thin film, supported by the balsa rids, makes the wing extremely strong at the light weight. We cover the rids, cut out of balsa, with carbon strips to make them stronger
The outer panels are connected to the inner panel with a removable CF wing joiner.

The wing is covered by the transparent Oracover. The accuracy of fit is perfect here as it is throughout in the Graphite.

An original construction was applied for the flaps and ailerons. Spar of flaps and ailerons is a carbon pipe. We produce this pipe of carbon cord with the 45 grades direction thread. When we glue ribs with carbon cap-strips to this pipe, we get extra rigid and strong flap or aileron. It's hard to believe but this flap or aileron is stronger and more rigid than a molded one.

This pipe is also the axis of the flaps rotation. Thus we reduced weight and made the work of the flaps and ailerons most accurate. The flaps can rotate down 90 degrees, which makes the brakes very efficient. Due to very accurate, without any slots, installation of the ailerons and flaps we achieved excellent airflow of the wings. The model flies at high speed very quietly without usual whistle.
Our experience of this way constructed models operation since 1997 has shown that our efforts for creation of these complex constructions are completely justified.

For order or questions connect to info@airplane-model.com