Free Flight, Free Speech

bomber wrote:So if we were to use the door area as the reference the above value of 0.03 would need to be 1.2/15.39 = 0.078 to give the equivalent drag basically out by factor of 2.6

Raise an issue on their github.

Here's the additional lift caused by elevator deflection Let's say I agree with this, and that it's convention to use the wing area to calculate the additional lift generated by the elevator. the difference in area between the wing and tail is a ratio of 4.54.... so if we were to use the tail area ...

A flat plate normalized by its surface area would be around 1.2; however the Cd is for the entire aircraft in which case using the wing surface area to normalize drag force is going to result in a higher value than for the wings alone. And that''s the point I'm making.... you can't apply the ground...

So you're flying in the area where ground effect takes place... usually defined through a table such as.. Here's something to think about, and we're only thinking about ground effect on LIFT.... but if you're flying at a positive AoA generating LIFT, ground effect has an effect... But if you're fly...

I did the perfect opposite. I optimized engine position, and thrust levels and directions to reported specs. And then I started from there. Off topic Israel, but let me warn you that the (JSBSim Propulsions) are a little weird It is worth noting that when I did the F-14 and other models although th...

I am not understanding what you meant. Simon calculates moments at run time (Force x Distance) whereas in a standard aero model the forces and moments are measured and normalized either in a wind tunnel, in the air or using CFD. The reference point is clearly important for this and it is important ...

And I don't mean that the AERORP is ignored by JSBSim. Of course the AERORP is used for computing the moment at the CG With all due respect the discussion about AERORP has gone beyond anything useful. show me where 99% of JSBsim flight models are more complex in downwash What other models do is irr...

mue wrote:Again: JSBSim does NOT stipulate any special location of AERORP

Except for the mass calculations that are applied based on the difference between the reference point and the computed CG - so there must be some correlation between the two - or the two must be set equal.

Yes I've spent a considerable amount of time looking at your spreadsheets, XML and flying a few examples of your models. Your model for downwash is too simple; it doesn't take into account pitch rate, the damping due to pitch rate or the time it takes for the air to flow from the wing to the tailpla...

forgot about Equivalent Force Systems. My mathematics isn't that great; I can do vectors and most mechanics but struggle with calculus, so differential equations aren't something that I properly understand. I've got a working knowledge of mostly what I need to know - but sometimes my lack of unders...