Brko F3k light reinforced Dbox

Brko F3k Spread tow carbon light reinforced Dbox and flaps Version 2014

1st place of Gregg Bolton on JEM 2015. Congratulation!!

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.)

The 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

Details:
- Wingspan 60"
- Length 44"
- Weight Auw 295g

Brko is available in three versions:

1.Spread tow carbon light reinforced Dbox and flaps - All Up Weight target 270g
2.Spread tow carbon Dbox with carbon reinforced flaps - All Up Weight target 280g
3.Full spread tow carbon wing - All Up Weight target 295g