General Information About Fully-Composite Aircraft Structure And Design; Discription Of Parts - Carf-Models SIAI Marchetti SF-260 Construction Manual

CARF-Models SIAI Marchetti SF-260 www.carf-models.com
General information about fully-composite aircraft
structure and design
All the parts are produced in negative molds, manufactured using vacuum-bagged sandwich
construction technology. All parts are painted in the moulds, either single colour or designer
colour schemes. The production method enables us to present this aircraft with incredible
built-in strength, while still being lightweight, and for a price that nobody could even consider
some years ago. This production process has huge advantages, but a few disadvantages as
well. These facts need to be explained in advance for your better understanding.
Description of Parts
The Wings:
Both wing halves are made in negative moulds, fully vacuum-bagged, using only 2 layers of
cloth in combination with a hard 2mm foam sandwich to form a hard and durable outer skin.
Because of this technology no additional structural parts are needed except for the main spar
tubes, and the integrated landing-gear mounts.
The ailerons and flaps are already hinged for you. They are laminated in the wing mould and
are attached to the main wing with a special nylon hinge-cloth, sandwiched between the
outer skin and the foam. This nylon hinge is 100% safe and durable. You never have to
worry about breaking it, or wearing it out. There is no gap at all on the hinge-side surface,
and there is a very narrow slot on the opposite side, where the control surface slides under
the wing skin. This hinge method is the cleanest you can ever obtain, but you have to take
some care during assembly for proper installation and servo set-up. The aileron is top-
hinged, and the flaps are bottom-hinged - with the molded flap gloves already attached,
trimmed and painted for you at the factory.
The wings are manufactured with recessed servo covers and hatches for 1 servo per aileron.
The flap servos are installed in milled plywood mounts that are screwed to the plywood rib,
close to the main wheel bay. We recommend a high-torque standard size digital servo for
both the flaps and ailerons in each wing. Our servo hatches and milled plywood mounts
make both, installation and exchange if necessary, very quick and easy and provide a rock
solid servo mounting and linkage system. Both Flap and aileron control surface horns are
preinstalled.
The main landing gear mounts are constructed from milled carbonfibre plates and plywood,
and are fully integrated into the spar tube system during the molding process, providing
an extremely rigid system.
The wings are attached to the fuselage with 1,5 x 40mm diameter aluminum alloy tube, and
retained with a single M6 x 30mm socket head bolt that is screwed through the plywood wing
root rib into a T-nut in the fuselage - accessed through the main wheel bay with a ball-ended
allen wrench. This wing tube spar system is strong, and already tested during many flights of
the prototype and similar models - so please do not modify it in any way !
The Fuselage:
The fuselage is also made in negative moulds, and is all constructed using state of the art
technology. All the loadbearing internal parts are installed during manufacture, to ensure
accurate location and reduce your assembly time.
The molded carbon tubes in the fuselage that receive the wing tube, the carbon stab spar
tube, and the holes and reinforcement plates for the anti-rotation dowels, are already
installed and aligned. There is no need to even check the incidences - you can be assured
that these are already set in the molds so that no adjustment is necessary.
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