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PHASOR 2.3 RAST
RAST RC sports paraglider from Para Aviation RC
Experience flight comfort and control in the first mass-produced RC sport paragliders with RAST® technology
RAST® is a technical design element patented by SWING, which makes paragliding more predictable by dividing the paraglider canopy into different pressure zones. The glider behaves more stable and is easier to control, especially in turbulent conditions.
It also makes launching very easy. The question is not, "Why RAST®?", but "Why not?".
Even during my man-carrying days, I was always fascinated by RAST® gliders from the Swing company.
Herry Hoffner, an RC paraglider pioneer from the very beginning, started to gather his first experiences with RC RAST® gliders in self-building several years ago. Herry has also laid the foundations for further developments in many other areas of the RC paraglider sector. His most famous construction, the "Rasty", Herry made available to us with all his knowledge. This glider served as the basis for our developments.
The first step, however, was to get in touch with the Swing company in order to be allowed to integrate their patented RAST® system exclusively into our RC sport paragliders.
With the contractual approval of the use of RAST® and the "Rasty" as a basis, we started our exciting further development of this type of RC sports paraglider.
The goal was to develop an RC sport paraglider that is always good-natured and easy to fly during take-off and in various flight phases, that already "marches" well in the normal flight phase and where the glide performance does not drop very much in the accelerated state. It should also have good and stable handling in the thermal position in the range of the lowest sink rate.
To meet these requirements, it was necessary to perform countless iterations of flow simulations of the canopy on the computer. The result is a profile strake with 4 to 6 different profiles in spanwise direction depending on the canopy.
We achieve a perfectly stretched profile nose, which additionally simplifies launching, by using Nitinol, a dimensionally stable nickel-titanium alloy with memory effect. This was a big challenge because we have very thin profiles with tight nose radii. The classic pocket for nylon rods cannot be adopted one-to-one for this purpose.
Miniribs in the trailing edge improve the handling and steering behavior very positively. The sail cut, which ultimately results in the design but mainly influences the sail tension, also had to be optimized.
The latest generation of Edelrid Magix Pro Dry is used as the filler for our gliders.
The heart of RAST® gliders, the RAST® valve, brings a lot of advantages in flight, but represents a high effort during the development phase and prototype construction. A larger number of prototypes are required for RAST® gliders compared to conventional gliders. This is because the overall design and also the tension distribution are mainly related to the RAST® valve. On a conventional prototype without RAST®, a lot can be changed afterwards. If something is wrong with the RAST®, there is no way to intervene because it is installed inside the cell and a completely new prototype has to be built.
We are now in the final phase of development and are pushing ahead with the work that still needs to be done. More info to follow.
Double Skin with RAST®-Valves
39, thereof 35 with RAST®-Technology
2,5 to 3,5kg
Aerodynamics, newly developed profile trac
We took the slightly longer development path and simulated the canopy in flow simulation. The result was a new Profilstrak. The canopy changes the profile 4-6 times (depending on the paraglider type) per side in the direction of the span - not only in the percentage thickness, but also in camber and camber reserve. The result was 4-6 new profiles per cap side in the profile strak. With this simulation method, we were able to cover a larger speed range. When gliding in the middle and higher speed range as well as in slow thermal cranking, the canopy always remains good-natured and easy to fly.
RAST® - Maximum control in every situation - that's RAST®
A RAST® valve is used in every cell of our RC paragliders. With RAST®, the inside of the canopy is divided into different (printing) sections perpendicular to the direction of flight by one or more panels, some with valves. This can influence the air currents in the cap.
Our RAST® RC sports paragliders have the following properties:
• Easy startup behavior • High canopy stability • Counteracts large-scale rattles • No complete emptying of the cap in the event of malfunctions, thus less loss of altitude and faster reopening • More power in moving air • More control in thermals
Nitinol rods in the nose – bent rods are a thing of the past. Nitinol stands for nickel-titanium alloy and is a high-strength shape-memory alloy. The 0.6mm thin nitinol wire is absolutely kink-resistant, as well as length and shape stable. Thanks to the memory effect, the wire ensures a perfectly stretched profile nose, which also makes launching easier, but packing the paraglider is also easier. In terms of weight, paragliders with Nitinol rods are even lighter than paragliders with Nylon rods.
Miniribs for better handling
We also used performance-enhancing elements on the trailing edge. In order to reduce the ballooning at the trailing edge and to halve the cell spacing, we installed miniribs in this area. This makes the flow more homogeneous, which has a significant effect on better handling and more sensitive control behavior.
Pro Dry Aramid Lines
We use the new Edelrid lines of the latest generation Magix Pro Dry as line material. The special coating reduces the line's moisture absorption by -60% and also increases UV resistance and dirt resistance. Due to their magenta and orange coloring, the lines are clearly visible and easy to sort. The high rigidity of the line material leads to a reduction in knot formation during use.