1 Pilot’s manual for BiGolden4
1. INTRODUCTION
Congratulations on buying your new GRADIENT BiGolden4! We believe that you will be very enthusiastic about its
performance and flight characteristics and we are sure you will be fully satisfied with your new tandem paraglider.
The BiGolden3 was introduced to the market at the start of 2014 and is still one of the best tandem gliders on the
market. It took a rather long time to make a better tandem glider than the BiGolden3, but we are very happy we
can say we have been successful!
The BiGolden4 is faster, more compact, has better handling and more performance. The canopy is designed from a
well-proven combination of different materials: all Porcher Skytex premium quality. Reinforcements are made with
nylon rods, which helps for better inflation and a clean leading edge. Line drag is reduced by using well-proven Liros
PPSL and DC Dyneema lines. In combination with Edelrid Magix Pro Aramid lines the result is an optimal balance of
strength, durability and drag.
We are sure the BiGolden4 is a beautiful tandem glider with very nice handling; a truly worthy successor to the
BiGolden3.
The BiGolden4 is certified EN-B/LTF-B and is meant for a large group of pilots: from hobby cross-country pilots to
professional tandem pilots. Anyone in fact who wants exceptional safety and easy take-off and landing
characteristics.
This manual will help you become familiar with your new paraglider and also provides information that will allow
you to get the best from your glider and keep it in good condition. If you have any further questions after reading
this booklet, please do not hesitate to contact our company or any authorised dealer and we will gladly answer all
your questions.
When you have become familiar with your new BiGolden4 we would welcome any feedback that you might have.
2. YOUR PARAGLIDER
2.1. Technical description
BiGolden4’s ground plan has a slender, elliptical shape with a slight positive contortion of the leading edge and the
new shaping of wing tips to minimalize the induced drag. This means that the ears of the canopy are slightly swept
back when inflated. This modern design has number of advantages. We have used knowledge and technology which
has been gained through the development of predecessors BiGolden3 and high-performance gliders such as
Nevada2, Aspen6 and Avax-XC5, all of which have excellent performance and climbing agility. We have optimized
everything for the maximum performance and stability at the whole speed range.
The glider’s aerofoils has been specially developed to provide the maximum stability throughout the whole speed
range. The leading edge is reinforced with integrated nylon stiffeners. This ensures optimal inflation of the wing and
helps to keep the shape of the leading edge perfectly clean even at the maximum speed.
For perfect force distribution from the lines to the canopy we used the arches with nylon stiffeners in the B, C and
D attachment points.
This glider has a unique VO system which is an improved shape of the cell openings for better inflation of the wing
and for a more smooth air flow between the canopy and surroundings. Small rectangular cell openings for sufficient
pressurization during all flight modes and deep V-openings for easy inflation and leading the air flow to the bottom
surface of the canopy. The combination of two cell openings shapes significantly reduces the aerodynamic drag
during flights in turbulent conditions and keeps the air pressure within the canopy more consistent, especially in
rough air.
Thanks to the VO system the nose part of profile has a smooth shape. The smooth shape of the canopy delivers the
aerodynamic cleanness and small aerodynamic drag. Different and complicated types of the leading edge have a
bigger aerodynamic drag.
The layout of the line attachment points improves stability at the maximum speed – an essential feature of modern
gliders. This layout also delivers a great endurance of the canopy. The shock and load tests of BiGolden4
demonstrate its qualities.
The well-proven four and a half rows and three-level line concept with three main lines per side is used. The
suspension system has been created from the highest quality lines (Edelrid and Liros). Main lines are covered. The
middle and top-level lines with progressively different diameters are made from special, very strong uncovered
lines. Uncovered lines have the advantage of splice loops, giving maximum overall endurance, durability and the
lowest possible aerodynamic drag.
The sophisticated combination of Dyneema and Aramid lines with different behaviour of shrinking characteristics
maintains the right geometry of the suspension system for a long time.
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