Cermak - the F3K specialist

 

Brko is a hand launch glider designed for circular throw technique (S.A.L.).

The model design and construction technology is based on it´s predecessor,

Osiris II, however it includes many improvements and changes in order to achieve

the following goals:

 

-         Good flight characteristics and performance that will satisfy all HLG flyers,

including the most demanding contest pilots.

-         Good flight stability and maneuverability.

-         Improved glide ratio (L/D) and minimum sink. 

-         Speed range that allows an efficient high speed search for lift, low speed

thermalling and a docile approach for landing.

-         Ability to achieve high launches.

-         Sturdy construction.

-         The most complete ARF kit that includes all required parts and allows quick

and easy model completion. (The kit does not include only adhesives and RC

equipment.)

 

 

Wing

 

The wing platform is similar to Osiris II, however there are some major

improvements:

 

-         Brko wing has a new airfoil JCT- R- 52.

-         The wing has a simple V dihedral and all span ailerons / flaperons that allow

you to adjust the wing airfoil camber for the given phase of the flight and to

maximize the wing efficiency.

Aileron servos and controls are in the wing and servos for rudder and elevator are in the the fuselage.

-         To obtain the maximum achievable airfoil accurancy, the wings are produced

            in negative molds using vacuum technique. The molds were manufactured

            using CNC cutter to guarantee the maximum achievable airfoil accuracy.

            The wing is made in one piece and attached to the fuselage by a three bolt.

-         Wing skins are sandwich Carbon/fiberglass / Rohacel/ fiberglass. Center section of the wing is reinforced with carbon fiber cloth.

 

 

 

Fuselage

      -    The fuselage is in the same general configuration as Osiris II.

 

-         The carbon tube of the fuselage (boom) has a bigger diameter to increase the

fuselage strength and stiffness.

 

 

Tail surfaces

-    The tail surfaces have changed from the Osiris II mainly in the area and their attachment to the fuselage tube. We used magnesium bolt 2.5mm for elevator. The tail surfaces are made in negative mould from rohacel and fiberglass

 

 

Paint

 

The model can be supplied in a color scheme according to the customer´s wishes.

The following are the standard paint versions:

 

-          Wing painted on the top and bottom.

      -     Fuselage has a finish of black carbon.and tail surfaces painted.

      -     Model without any paint.

      -     Other colors schemes (stripes, etc.) are possible at an added cost.

 

 

Specification

Rozpětí křídla	1499 mm
Délka trupu	1111 mm
Plocha křídla	22.8 dm2
Profil křídla	JCT - R- 52
Prázdná hmotnost	195 - 200 g
Letová hmotnost	270- 300 g
Zatížení křídla	11.84 - 13.15 g/dm2