Niže je link na video koji pokazuje jedan task na "Greek league 2015" u 3D s nekoliko glidera istovremeno.
http://www.doarama.com/view/361233Napravio ga je tip koji leti Mentor 4 (veličina L, na gornjoj granici 128 kg). Uglavnom poanta je kako se M4 s manjim aspect ratio-om (5,4) cijelu trku držao rame uz rame s 7+ aspect ratio gliderima (comp krilima).
Tip je cijelo vrijeme letio M4 na 60%-100% speed-a.
Navodi kako je iscurio je 5 km prije cilja zbog malo peha...
Razvila se i diskusija na PG forumu oko ovoga, pa koga zanima može pročitati na linku niže:
http://www.paraglidingforum.com/viewtopic.php?t=66922&postdays=0&postorder=asc&start=200(tema počinje pri samom dnu 5 stranice).
R.
PS - ovo je prvi komentar konstruktora Mentora 4 iz NOVA-e
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Contrary to what many pilots think, high AR is mainly an advantage at high AoA. The lower the AoA gets, the more lower-AR gliders are in favour.
That's valid for any aircraft. So it's no coincidence, that most glider-plane speed-records aren't flown with open-class high-AR gliders, but with gliders with less wingspan/ less AR.
A short explanation for this effect:
The advantage of high AR is a reduction of induced drag. And induced drag is most dominant (compared to other types of drag) at high AoA. So if you're able to reduce the induced drag at high AoA you gain a lot of performance. At lower AoA it doesn't help a lot. (Overall you might even loose performance, because more wingspan has a couple of disadvantages.)
High AR wings partly compensate this effect with a reduced size. (or rather a high wing loading)
That allows them to fly with high AoA (where they work best) at comparatively high speed.
Something less theoretical - a practical example within our product range:
The performance gap between the Mentor 4 (AR 5.4) and the Triton2 (AR 6.4) is significant at trimm speed, but almost irrelevant at full speed. The higher AR of the Triton 2 has no benefit at higher speeds.
However, your video is really impressive, but not as surprising, as one might think.
Btw: What's your take-off weight on the M4-L?
Cheers,
P.
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NOVA R&D-Team
