Camarillo said..broVan said..
It felt loose on the yah and somewhat tight on the roll.
shaka808 said..
The roll instability (which is good for turning)
??????
Guessing the yaw looseness he experienced was due to a combination of the crazy short fuse and the tail he was on. I am using an ultra short fuse with the KD 14" tail. I only prone and do not like yaw as the tail slides too much when turning, especially when cranking connections. The KD tail has enough vertical profile that it does not slide or yaw like a flat tail.
The roll instability I was referring to was in relation to the 980. The 999 rolls over into turns much easier than the 980 (however not as well as my 810). I would also say it is easier to roll out of a turn in comparison to the 980, however due to its span it still requires time and planning like any large HA wing.
While pumping, the 999 wants to roll, whereas the 980 has much more roll stability. I attribute this to the flex, and it is controllable with a modified pump technique. With the 999 it is a slow push pump, wait for the wing tips to flex down and "flap" then repeat, it feels like a bird flapping its wings. It requires much less leg energy and covers significantly more distance per pump. I have much less back leg fatigue pumping this wing. l also only use the aluminum mast, as I do not like the flex of any carbon mast. I am really enjoying the flex characteristics of the 999 wing though.
The tips flex prolly 1cm with little pressure applied when static, so I can only imagine they are flexing a couple centimeters when loaded up at speed. Airplane wings will flex greater than 5% of their span in normal operation.