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Both planes will go up in a thermal. Also remember that structures have gotten much better since the Xp1 was introduced. We are now flying 10-15% (even more) lighter planes for same strength. You can also fly Xp2 with much less ballast. Light weight usually helps when in thermal. And if everything else fails, add 2mm more camber |
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I got two good days of dialing in the x2. No pop-offs after reducing trailing edge drop and some down elevator. Really enjoying the plane. Flew it in no wind and winds that built to around 20 without ballast. The plane moved around reasonably well given the winds. Loving it!! I think it's THE value in the crop of newer ships. Rob |
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Finally got my hands on a couple X2 - 3.8s. No time to take a close look yet, but has anyone tried flying this new 3.8 with the 3.5 stabs yet?
If I recall correctly, when I had the orignal 3.8's, the cg felt perfect at 118-120mm with the 3.5 stabs. I'm thinking the newer X2's should behave the same. And yes, definitely smaller stabs for me on the 3.8's . |
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I have both stab sets - a standard 3.8 MKII and a SL with the larger stab - I rn them both at 124 and it rocks I can feel the difference int he LZ with the larger stabs - its larger all the way for me. |
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I also already tried just one half of one smaller stab for my SSL version. REsults might vary... ok I tried that by accident, its quite important to tape those little suckers together. No X's were harmed in any of this. |
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X-1 vs X-2 foil comparisons.
A quick look. I need to mention that the TE of the 2 are not "aligned" as in the co-ordinates are not rotated to give exact reference points. I won't bore most on here with the analytics as I have in the original X thread . |
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Here's a quick plot of the 3.5 X1 vs X2 in its natural foils.
The analysis suggests that the X2's can achieve absolute lower sink at min sink speed (within 3mph range, 1.5m/s), but suffers vs the X1 up until past 30mph (13m/s). In other words it can hang a bit better, but can move about better when flying over 30mph. Seems to correlate well with most of the flight reports on here so far. One can say the foil is optimized for the "extremes" of F3J...i.e. either to maximize climb, or come on home fast (against the wind). I'll have to see how the foil reacts at the various typical camber and reflex positions. I wish NAN would post these types of info. |
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Last edited by fnnwizard; Dec 27, 2012 at 02:25 AM.
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X2 airfoil data
Hi Tuan,,,
while your away from the christmas tree now,,,,, Id like to get the theoretical data for the "max" camber reflex position at a zooming speed. Is that possible mr wizard ? Richard |
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