SIV & Maintenance
The Delta2 was certified with the use of collapse lines.
The Delta2 is a new generation wing which incorporates R11 technology. Alongside the Shark Nose, one of the developments we have incorporated is moving the A tabs further away from the leading edge and deeper into the chord. This makes the wing more collapse resistant; more solid, stable and confidence inspiring.
It is possible to perform SIV training with the Delta2, in fact we strongly recommend it. Trim speed symmetric and asymmetric collapses using the A risers to deflate the wing as normal are possible, as are full speed symmetric collapses. However, we strongly recommend to not perform full speed asymmetric collapses with the A risers alone. All other manoeuvres are possible.
In a real-life collapse, the Delta2 behaves in the same way as any other wing in this category, however to induce a more natural, lifelike full speed collapse conforming with EN certification requirements the deflation must be done with the addition of collapse lines. When you induce a full speed side collapse without collapse lines the results can be different…the canopy pre-accelerates* before the deflation occurs and the resultant collapse has more volume of air still trapped within the sail. This causes the collapse to fold with a greater angle, this increases the chances of a shock re-inflation and therefore results can be more aggressive and potentially fall outside of EN requirements. The collapse lines need to be mounted accurately and with the addition of attachment tabs sewn into the nose and since these are not supplied with the wing we strongly recommend to not induce full speed asymmetric collapses at all.
We think this is a small price to pay for a more solid glider - the feeling on the bar is the best we know. If the Delta2 is flown with normal active input it is a very stable wing indeed, in fact it is one the most collapse- resistant wings that we have ever made.
*Pre-acceleration is when the glider accelerates before collapsing. Imagine flying at full speed and pulling an A riser to induce an asymmetric collapse. Instead of deforming and folding immediately, the side that you pull actually accelerates first (because of the reduction of AofA), thus momentarily causing a turn in the opposite direction. At the point of collapse, because everything is not in line (slight turn, slight roll/yawing action in the other direction) collapses are somewhat artificial with a greater angle, more chance for shock re-inflations and potentially more dynamic reactions.
Care and Maintenance of the Delta 2 Leading Edge Reinforcement
The plastic inserts at the leading edge of the Delta 2 and certain other Ozone wings are easily replaceable without cutting or sewing. Please click here to read the instructional pdf.