So far, I've wasted money on two old wings that I can't even kite properly.
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Yeah, I know. Some guys have to learn the hard way. *_^
I was just wondering if someone could give me some advice on what to look for when
choosing a wing. I know newer is better, but am not sure exactly what makes a design better.
If I had the money, I'd go for new APCO hybrid, but I don't.
I've seen some dudek wings for sale, but I am clueless as to what size I should be looking at.
The only training I could do will be next spring now, and 9 hours away (provided the weather cooperates and
I can get time off work and I can scratch enough money together to pay for it all)
Is a Pluto worth looking at? How about sky paragliders or dominator?
I am 102 kg soaking wet, but I found that I can get that down if I do enough ground handling.
So, sorry for the rambling, incoherent post, but I hope someone could help me understand wings a bit
more.
The first wing I had was an AXIS stardust 28m2 - It was HUGE! I finally did get it in the air but I needed so much wind to do it that it was dangerous. There was no hope of nil wind kiting.
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Then I got an EDEL (I think it was called a rainbow) small size, much easier to handle but still could not
kite it worth a hoot. Someone on here told me it's because these older wings are just hard to handle and
I should be looking at more modern designs. So that is the reason for my post. I am looking for some
insight on what makes a wing modern, what designs are good for a beginner etc.
Thanks in advance
How much does size matter
Because materials are the major cost of a wing, the higher the wing loading the more profit a manufacturer makes. Check the size of the wing, as a rule of thumb the sizes in square metres (flat) are:
24 for a Small
26 for a Medium
29 for a Large
Between manufacturers the sizes may vary, with some manufacturers quoting only the flat or projected surface area of a glider, whilst others may provide numbers based on different methods of calculation. For example, we recently layed out a Medium sized glider from one manufacturer on top of a Small-Medium from another; the Medium was about 1.5m2 smaller than the Small Medium. So when it comes to size, again, make sure you are comparing like for like,
Gliders that are more heavily loaded are generally more resistant to collapses and more benign in induced collapses. However, in real life the collapses themselves are more severe and may come as a bit of a surprise because it takes more turbulence for them to do so. Heavily loaded wings are faster and have snappier handling with faster responses, but they also have higher sink rates and climb slower than lighter, loaded wings.
The trade off is size vs. performance
There is a trade-off, and the loadings of competition wings are getting progressively higher each year. Nevertheless the profit and cost to the manufacturer depends on the actual area of the wing.
Most manufacturers produce gliders in Small, Medium and Large sizes, starting with the medium size and scaling up or down from there. This means that the other sizes had undergone more development and may well have been better. Recently in the CIVL Plenary meeting the certification process was up for debate again and changes with regards to the primary certified size will be implemented for .
In general however, the more benign a glider the wider the certified weight range will be. There are substantial certification costs for each size of glider, so development costs are higher for manufacturers who produce many different sizes of glider. On the other hand a small weight range can mean never being far from the optimum weight and lest we forget that most top speeds for gliders are quoted at being flown at the maximum weight. On a 95-130kg glider the top speed for 95kg all up will be 15% (roughly 7km/hr) lower than for the 130kg pilot it was measured with.
Most manufacturers produce different sizes by scaling. The larger gliders then have less line per unit area and the lines are the same thickness, so the larger gliders tend to have higher performance. They also tend to be more benign whereas small gliders tend to be more aggressive. This may be because the intrinsic time constants are inevitably size-related; It takes longer for a big wing to collapse or turn because it has to move further. It may also be because the designer has more performance to play with in the larger gliders, so the performance vs. sacrifice to get good stability is acceptable, whereas with small wings in order to obtain adequate performance, the boundaries need to be pushed to the limit.
Fortunately new developments in structural and aerofoil design are making substantial improvements in the performance of small wings.
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