New wing from Skywalker factory >>X8 UAV platform<<
For those who want Long range / Long flying time / High payload the new X8 wing will get you there..
The wing X8, will be released early 2012.
Wing span: 2122mm
Wing area: 80dm2
valid payload: 1000-2000g
X8 use KV730 2820 Motor, 40-60A ESC and 1260, 1280 prop
I'm already in love with this bird...
Now the X8 wing is ready in strong EPO foam
Comments
Andrew: While increased wing sweep generally makes for a more stable delta, it also moves CoG backwards, making it hard to fit any payload beside motor and batteries in the body.
Flat spins are the bane of pure delta wing designs. They are hard but not impossible to recover from if you have enough altitude. The biggest no-no most novice pilots do is that they try to directly counter the spin instead of gaining airspeed (nose down, apply throttle).
https://www.youtube.com/watch?v=1qDIEjPDXtU
Another Vid
Sorry, I lost count as to how many 'I' 'I''s you mumbled about, re flight report? these are models for fun, FPV along with everything in-between, not weapons of mass destruction...Tip> take your rigidity in pitch, add some gyroscopic rigidity with a pinch of spinning propellor/motor with a whole lot of whatever and start your own thread
Sorry for not fawning over this thing in a naive way Jason, just because it looks great.
I don't believe I was threadjacking at all - merely putting my point of view that this design may not have benign flight characteristics and putting my reasons for thinking this.
The X5 is very similar to the Falcon (also on www.bevrc.com) so I'd expect it to have similar flying characteristics too, although I haven't searched for any reports on it. Your definition of "flys fine" (sic) leaves a lot to be desired as a flight report...
Damm it I have to get 2! that just looks like the sexist FPV rig you can ever own!
Andrew, this isnt your bird, so dont get the point of your post(or attempted thread jack) about what you have done as this X8 is no throw together and will be amazing value for money
http://www.bevrc.com/ has had the X5 or a while now and its flys fine
PS: when I mean rigidity in pitch, I'm refering to gyroscopic rigidity that the spinning propellor/motor adds.
looks like a lovely thing, but...
...from what I casually read about it's smaller brother (the Falcon EPO) it suffers from some interesting flight dynamics at the edge of it's flight envelope. (http://www.rcgroups.com/forums/showthread.php?t=1288385). People are reporting that it quickly drops into a potentially unrecoverable spin when it stalls.
Interestingly, these are similar flight dynamics that I discovered when I was X-Planing with my HDwing concept (which, sadly is still a concept at this stage), so I think they are characteristics of flying wings generally and perhaps poorly designed ones in particular. Be careful with this beast before you load it up with all your expensive autopilots and FPV gear!
There are several things I have done to help mitigate these characteristics on my X-Plane model. Firstly I was trying to make it work as a glider, but abandoned it because adding a motor and propellor increases the rigidity in pitch without having to have extreme wing washout,
I have also gone to wide-chord tip flaperons as opposed to full-span flaperons that are popular on flying wings. I guess this is because it makes them easy to control and to locate the servos - I haven't made mine yet!. This revision is to increase the efficiency of the wing by, in effect, having variable wash-out
Additionally, I have increased the wing sweep. The wing tips of a flying wing are analogous to the tailplane of a conventional aircraft - the tips are pushing down to counteract the forward CoG and to give positive pitch stability. By increasing the sweep angle, you increase the moment arm that the tips are working with, so you can get away with less washout and, in theory, end up with a more efficient wing.
Just a tuppence or two from my work, FWIW.
thank you
-
7
-
8
-
9
-
10
-
11
of 12 Next