TEK Nozzle straight, 240mm long SM-Modellbau # 2781

Total Energy Compensation for the Vario in the GPS-Logger 2!

The TEK nozzle is the ideal addition to our GPS-Logger 2. This has a TEK connection on the variometer and, together with the TEK nozzle, provides a variometer experience like with manned gliders. Our TEK nozzle works according to the principle of the "Braunschweiger nozzle". Manned aviation almost exclusively uses this design today. Although the construction is more complex than the simple curved Nicks nozzle, it is unsurpassed in compensation and delivers perfect results even in model aircraft.

The nozzle is made entirely of stainless steel and hard-soldered. The nozzle head is scaled 1:2. This sounds bigger than it is, as the original nozzles are very small. The nozzle appears correctly dimensioned on models of almost any size. The tube with a 2.5 mm diameter is approx. 240 mm long and 40 mm high for the angled version for installation in the vertical stabilizer. In the original, this length is about 750 mm, so our nozzle has the correct length for 1:3 scale models. For smaller models, the tube can be shortened slightly; for larger ones, it could be extended and stiffened with a carbon fiber tube. The straight version for installation on the fuselage spine is approx. 120 mm long.

What is TEK anyway?

TEK simply means the suppression of "stick thermals" by taking into account the speed of the model. This is achieved by connecting a TEK nozzle to the variometer sensor. For slow models flying at a constant speed, a simple variometer without TEK is often sufficient. Here, the errors due to controlled altitude changes are not so great, and thermals can be easily recognized by the variometer. The cleaner you fly and the smaller the speed changes, the better the variometer works without a TEK nozzle. With dynamic models or even with imperfect flying style, however, there are always variometer outputs that do not show the model's true climb and descent, but only a controlled speed or altitude change, the "stick thermals". In fact, when searching for thermals, the only thing that matters is whether you are flying in rising, falling, or neutral air mass. As independently as possible of how the aircraft is currently moving. Exactly this behavior is achieved by using a TEK nozzle on the variometer. This nozzle generates a speed-dependent negative pressure and thus simulates a climb with increasing speed, which compensates for the loss of altitude. So you push down, the altitude decreases, and the variometer without TEK would show a descent. The TEK nozzle compensates for this by indicating a climb for the increasing speed when pushing down. The conversion of altitude (potential energy) into speed (kinetic energy) is therefore no longer misinterpreted as descent or climb with the TEK nozzle. Ideally, with full compensation, the variometer in absolutely calm air always shows the aircraft's current sink rate. Of course, this is not a constant value, but depends on speed, lift, and other factors.

The connection between the TEK nozzle and the GPS-Logger 2 is made with the separately available nozzle holder, item no. 2785, and the hoses included there.

Scope of delivery:

• TEK nozzle straight made of stainless steel