Thanks very much for the good advice. ;=] I will get some RC equipment and thoroughly flight test the quarter scale version when it gets done. I wonder if there are wind tunnels that can fit a four-foot wide model to rent some time on at Embry-Riddle Univ. or elsewhere in Florida.Allen, that’s an interesting project you have going there. Is your scale mock-up going to fly? I hope so, as I think there’s a lot to be learned from it especially when you’ve come up with such an original design. When you do fly it please fly it lots in many different weight configurations and test maneuvers. I’d suggest going so far as duplIcating a full-scale airplane’s lengthy test program and modifying the model accordingly as you learn its quirks.
Elsewhere on the forum are two rather lengthy threads about a prototype that had a quarter scale model built but not tested beyond showing it would lift off the ground before starting work on the real thing. Flight testing the real thing has shown time and again that maybe the model should have been fully tested before locking in the design. I can’t stress enough how important it is to learn from that.
It seems EZest to merely put some washout in the trailing edge of my SkySled 'wing-body' airplane design. I understand that built-in solid feature simulates upward deflection of both horizontal stabilizers which are the trailing edges of the flying wing design. The horizontal stabilizers can be operated differentially, one up and one side down to also function as ailerons. These devices have been called "pitcherons."Unfortunately, no, and the problem with almost all shapes like a "traditional" airfoil is that the camber, the curve, pitches the nose down , and increases with speed.
Here is an example of a wing/body design that's only flown a few feet up.
Notice the big horizontal tail that keeps it from flipping nose down into the drink after it lifts off. You probably don't need one that big or position, but most flying machines have a balancing surface that changes how much it pushes with airspeed.
It can be weird with flying wings and lifting body designs. A typical modern flex wing hang glider doesn't have a separate tail, but still does the airspeed changing balancing act with sweep and twist.
The commonly used term is "elevons". Perhaps your ideas would have been better accepted if you had familiarized yourself with the common language already in use..... These devices have been called "pitcherons."
Perhaps they can have the capability of being 'trimmed' so they function as trim tabsl??
Is this the same as reflexing the trailing edge?Also regarding wings pitching downward, I can adjust the radius of the leading edge of the wing to push it upwards more. by raising the center of the radius higher on the LE.
That might make it worse.I can adjust the radius of the leading edge of the wing to push it upwards more. by raising the center of the radius higher on the LE.
I like the idea of building more 'up' force into the leading edge radius. This means raising the whole radius up to, or near, the camber line instead of having the usual 'droopy nose' look on the face of the cutting edge. That looks to me like it will counteract the down-pitching moment of a cambered airfoil. ??A rectangular slab has a small nose down pitching moment at many angles of attack. Go past that and you've got an upside down airfoil, where the lift is down until you get to angles of attack that with a skinny airfoil like being discussed will stall really easily.
The "upside down" tail fins on a race car have a "nose up" moment, that you have to figure in when building their mounts.
Are you going to have some way to control pitch?So there's nothing to do but trim out the pitch with trim tabs on the wings trailing edge?
I want to use a 20% chord thickness. That should pull the nose up.
That is called reflex. More or less the same thing as having the elevons deflected upwards. With this it is theoretically possible to have a wing that will pitch nose-up, or even have no pitching moment..... The wing bottom is flat, but might later put some wash upward on the trailing edge.