How to choose a ballistic recovery system
Worldwide statistics of small aircraft accident investigations clearly show that 80% of all fatal accidents happen near airfields, at heights below 150m and at low speeds, close to stall speeds. Most of the accidents occur shortly after take off or on the approach to landing,including the final turn.
When you purchase whole-plane ballistic rescue system, ask how well your system will perform under the same condition:
- Ask your provider to show you video footage of the parachute tests of your parachute at the stall speed of your aircraft. How quickly does the parachute open? Does it open well away from the airplane to reduce the chance of fouling? How smoothly does it open?
- This could be a ground test, using a tow vehicle, but you must always see the slider position. The right position of the slider is close to the edge of the parachute. Does the parachute open smoothly?
- The test could also be a drop test VIDEO from a crane, balloon, aircraft or helicopter. Again, be sure you can see how well the slider performs.
- Always measure the opening time. Take a look at the GRS Web site www.galaxysky.cz and under “Technical Data” click on “Recovery from Spin.” There you will find information to help you figure what parachute system will suit you the best.
Your real chance for rescue at low height, low speed, if you unexpectedly lose control over your aircraft, depends on these details.
Galaxy makes public all of the important data about all of its products. If you purchase a system from another manufacturer, don’t rely solely on promotional infromation. Insist on seeing the details so you can make a fair comparison.
Unfortunately, not every manufacturer of parachute rescue systems has this available,does the tests honestly and makes public all of the important data!
Download video videoInput aircraft data: MTOW= 472,5 Kg, VNE =251Km/h
a) Recorded opening time at 45-60 km/h…3,8-3,4 sec.
b) Sinking 6,6m/sec.
Minimum rescue height:
g (weight acceleration) [g = 9.81 m/s2] t ( recorded opening time ) [s] vOP (sinking rate of fully unrolled canopy) [m/s]
At reverse flight + 20 m. Minimum rescue height is then ca: 49,5 + 20= 65m above ground
The system can be used for the speed of 251Km/h and MTOW 472,5 Kg, or the speed of 260 Km/h and MTOW 450 Kg.