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P3D v2 Angle of attack at cruise speed, adjusting

lionheart

lionheart

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us-arizona
Hey all,

There used to be a good way to adjust the angle of attack of a plane that was flying along at cruise speed. Some planes tend to nose down at higher speeds and we had found a way to adjust that.

However, I have forgotten what it was. I had thought it was 'wing incidence' in the aircraft.cfg file, but adjusting that 'and' the htail incidence (both ways) does absolutely nothing.

Any thoughts? Does anyone remember the tweak?


I cannot adjust my lift fields. They are right where they should be. She looks bad though with her nose pointing downward at cruise speed.
 
There are a number of air file records that can affect the pitch angle of a plane at cruising speed. One is Record 404 Lift coefficient vs angle of attack. Unless the wing has a symmetrical airfoil (same shape above as below the centerline) the CL at zero AOA will usually be positive. If it is, say 0.4 at 0 AOA, and the cruise speed CL for level flight is 0.2 then the plane will be nose down when cruising.
As I said, there are other records that contribute to the final pitch angle, but 404 is a good one to start with.
FYI, the wing incidence has no effect, AOA is measured relative to fuselage angle. Horizontal tail incidence effect depends on CL_dh in record 1101. If this is 0 then tail incidence also has no effect.
Lets have a look at your 404
Roy
 
AAM works in P3D?
Then times See table 401. Lift vs Mach Speed

l3v4hei17k1h.jpg
 
2015-2-11_17-12-32-672.jpg
Lets have a look at your 404
Roy
Click to expand...

Roy, its the Cessna 172 template, unmodified in section 404. I'll give that a few adjustments today and see what I can do to it.

This is a design project, a four seater dual wing, similar to a canard but the front wings act more like a second set of wings, like a P180 Avanti. I wanted a set of thin wings similar to a glider so that it can glide well on descents and also have low drag, but she can really start to nose down approaching 190 knots.
 
Bill,
I suggest you copy the Mooney Bravo 404 as a first step. It has similar CL max/AOA, but it is a much faster plane with, apparently, less cambered airfoil. It should suit better.
Or you could just base it on the Mooney.
Roy
 
Roy, that worked excellent. Just enough to make it look normal.

Before, it was like the early, first version of Star Trek, aiming down probably 20 degrees.
 
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