The most significant advance in sailplane instruments since the invention of Total Energy and maybe the variometer itself
In the past all sailplane variometers have suffered either from pilot induced attitude changes (non total energy variometers) or sensitivity to the effects of horizontal gusts (total energy variometers) both of which mask real changes in the vertical motion of the air being flown through.
A true technological breakthrough the Dynamis Variometer system was designed to eliminate the problem of the sensitivity of conventional Total Energy systems to the effects of horizontal gusts.
Sailplanes can really only use vertical motion in the air in order to soar.
Dynamis completely separates the vertical air motion from the horizontal air motion while eliminating pilot induced attitude and airspeed changes from the variometer.
The problem was recognised 50 years ago and has only got worse as sailplane performance and cruise speeds have improved.
Until now the problem was not able to be solved. It is not a filtering problem as the vertical and horizontal motion occurs on the same time scales and has similar magnitude, making filters useless.
Modern sensors have made the solution possible and for the first time a sailplane pilot has complete knowledge of vertical air motion uncontaminated by horizontal air motion changes and pilot induced rate of climb changes.
In addition Dynamis calculates the horizontal vector wind many times a second and averages this for updating to the pilot once a second.
As the Dynamis variometer only responds to vertical air changes the response can be faster than can be used for a traditional pressure based Total Energy variometer.
Flight tests have shown that Dynamis lets the pilot see more structure in thermals and at high speeds the steady indications hugely aid selection of the best path through the air.
Speed to fly indication becomes more useful and Dynamis eliminates the second order effects from total energy probe locations, seen when pushing and pulling, which cause traditional total energy variometers to show spurious indications.
The Dynamis variometer system is based on the Borgelt B – TWO (linear scale or log scale) variometers with additional internal sensors and the external Dynamis sensor module. Some additional installation is required.
See our article Horizontal Gusts under articles for a more detailed explanation of what happens with conventional TE systems.
See Dynamis in flight here:
https://www.youtube.com/watch?v=NiSCU84mCng&t=445s
Also see “How Dynamis Works – long version” under Articles
http://www.borgeltinstruments.com/wp-content/uploads/2025/04/How-Dynamis-works-long.pdf
See manual here:
http://www.borgeltinstruments.com/wp-content/uploads/2025/04/Dynamis_Manual_April_2025.pdf
The B -TWO DYNAMIS variometer
B – TWO
The main features of the new instrument are:
– Unique lift trend displays and warnings, both audio and visual
– expanded scale in low range (+/- 2 knots or +/- 1 M/s)
– compressed in high range (+14 knots or +7M/s maximum indication),
catering
for all lift strengths without switching,
– better sensitivity (pointer movement per lift unit) in mid range than
typical mechanical vario or LCD vario
– expanded audio sensitivity in low climb range
– digital display never obscured by pointer while climbing
– high contrast, high resolution stepper motor driven white pointer against
black background – LCD pointers cannot compare!
– bright, clear colour LED indicators
– innovative and informative audio
– Running average (AVERAGER) and total climb
average(INTEGRATOR)
– 57mm only, easily field
changeable for knots or metric calibration.
– clear labelling of switch functions
– B – TWO includes airspeed sensor and is designed for interfacing to Oudie
or other PNA/PDA type glide computers. Only one instrument hole
required for B – TWO (57mm) plus Controller display (see manual)
– B – TWO is only produced with the Dynamis GNSS/inertial based Gust Free Total Energy sensor with dual frequency band quad constellation receivers and continuous wind vector computation and display
– B – TWO has “up front”, convenient, control/display unit with internal
navigation, glide and wind computer display (GCD)(same as legacy B500)
– common repeater to both instruments includes controls
– Robust mechanical and electronic design
– glass front, not plastic
– field proven hardware and software
– proven field reliability
– builds on many years of B300/B400/B500/B600/B700/B800/B900 production and over 44 years of
pressure transducer variometer production
– thousands of variometers in use worldwide
– same company, same owners
– designed and manufactured by a former championship soaring team
and software developers with soaring experience.