Hi guys, really interesting experiment going on here! My two cents on the "ballooning/pitching down" issue:The effect is also present to varying degrees on the 737 I fly. There is a difference in trim when selecting lower flap angles at first, since mostly the wing area is increased towards the tail - this will shift the center of lift, and therefore more nose-up force is needed to maintain attitude. Increase in lift is negligable.Once you get to 10 degrees and more, the flaps will angle more downwards and backwards. This will result in both the trim and also the lift changing, but also quite some more drag. This feels like the plane pitches down by itself, but with the increase in lift the flightpath will actually stay the same (just stop the nose after dropping a few degrees down). The plane would "balloon" if the nose didn

Excellent description Jan...what you CAN do with a plug-in though....is separate the handle position from the actual flap deployment angle. So if you had X amount of lift/drag for a given flap angle, you could map that to a lever position. so while the lever position would say you were at X flap position, you might actually be at some other flap position. If we assume the functions to be linear...then whilst the angles between lever and actual flap position might not be the same, the net effect COULD be the same...not necessarily trivial, but doable with the tech. That is to say, non-linearty between flap lever setting and net effect would be achieved. I've taken this exact approach with my MU2 where the condition lever position is not proportional with the engine speed which it dictates; however, it DOES match the actual performance within 95% of reality. ( I have to acquiesce the remaining 5% to X-Plane's engine model)

I should add a bit here Larry..that I need to establish a stable "baseline" RV 6 using the default RV-6. I'll provide a download link once I feel I have a decent "baseline". Once I have that, I'll provide the link and you'll have a basis for feedback and commentary. I'll provide version numbers and commentary consistent with any changes I have made...and describe my thoughts on the changes and result effects I hope to achieve. If we get it even halfway decent...then we can just have fun and paint er up and everybody can have a "larry special" for x-plane :-) Note to Geof: This does NOT supercede our discussions on the Baron :-)....two different simultaneous experiments!

Note to Geof: This does NOT supercede our discussions on the Baron :-)....two different simultaneous experiments!Thank God! :( :(

LOL Geofa....I will say that you're "experiment" is of a much lengthier nature than Larry's...so please don't think you're being ignored. Larry's experiment is flight model related...your's is full on 3D related.

LOL Geofa....I will say that you're "experiment" is of a much lengthier nature than Larry's...so please don't think you're being ignored. Larry's experiment is flight model related...your's is full on 3D related.

But..................I want a fully functioning 3D Garmin 696! :( BTW --- when the RV6 is functional, I can always take the real one up for exact comparisons of specific points. As Geof previously mentioned, you do things to make planes do what you want, without consciously taking notes all the time.L.Adamson

This is how all FMs should be tuned :). Way to go guys.Tero

BTW --- when the RV6 is functional, I can always take the real one up for exact comparisons of specific points. As Geof previously mentioned, you do things to make planes do what you want, without consciously taking notes all the time.L.Adamson

That is a good point, Larry. We have official "pitch and power" tables that will tell you how much N1 to set and the pitch value to achieve a certain speed/climb-rate at a certain weight. And while it is essential to have knowledge of these values to accurately pilot an aircraft (otherwise you will be "hunting" the parameters to achieve stable flight) - it is also surprising how many parameters will influence these values and how much more (or less) power sometimes is required to achieve the desired state. If the 737 I fly was a simulator, on many days I would say "nah, they didn

I think I'll take a roundabout approach whereby I'll establish an initial model based on your comments earlier Larry. After that, we can try one adjustment at a time and if we have to come back to readjust after further adjustments, then we can hone in on some final setup. I'm working on the initial flight model using the default RV6 as a base....take a few days of free time. I'll post back when ready.you have any idea what airfoils the RV uses? Angle of incidence of the wings and/or washout? including the horizontal stabilizer?

you have any idea what airfoils the RV uses? Angle of incidence of the wings and/or washout? including the horizontal stabilizer?

NACA 23013.5 with a slight modification to the leading edge. Wing 1 degree incidence. No washout. Horizontal stab is 0 L.Adamson

NACA 23013.5 with a slight modification to the leading edge. Wing 1 degree incidence. No washout. Horizontal stab is 0 L.Adamson

Ok, the baseline is ready. This is just a jump off point. I modified the plane-maker shape..added some more elements. The airfoils are 23012. I'd have to dig a bit deeper into the 23013.5 and build those custom if we decide to go there. The engine is a 180HP, prop constant speed. I have to admit I'm tossing it together and somewhat leaning on your suggestions as you'll be much more astute. ..meaning I might have left out something obvious. The only real thing I've incorporated from your description is the down-pitch tendency when the flaps are deployed. I've made adjustments to the intertia to keep the thing from being too twitchy in x-plane. I'd suggest you set the number of flight models to about 4 or more in the "operations" menu tab. You can use the 'o' key to trace flight path. What would be helpful would be to break the performance envelope into regimes...i.e. takeoff / climb/ cruise, etc....and we can attack those one at a time. The download link to the plain gray RV6 is:http://www.x-scenery.com/xscontent/downloads/RV-6.zip

Ok, the baseline is ready. This is just a jump off point. I modified the plane-maker shape..added some more elements. The airfoils are 23012. I'd have to dig a bit deeper into the 23013.5 and build those custom if we decide to go there. The engine is a 180HP, prop constant speed. I have to admit I'm tossing it together and somewhat leaning on your suggestions as you'll be much more astute. ..meaning I might have left out something obvious. The only real thing I've incorporated from your description is the down-pitch tendency when the flaps are deployed. I've made adjustments to the intertia to keep the thing from being too twitchy in x-plane. I'd suggest you set the number of flight models to about 4 or more in the "operations" menu tab. You can use the 'o' key to trace flight path. What would be helpful would be to break the performance envelope into regimes...i.e. takeoff / climb/ cruise, etc....and we can attack those one at a time. The download link to the plain gray RV6 is:http://www.x-scenery.com/xscontent/downloads/RV-6.zip

So far, I get the "windows can't open this file". I do get the dog face and RV6 but that's all. In the meantime, I'm leaving for a few hours.L.Adamson

So far, I get the "windows can't open this file". I do get the dog face and RV6 but that's all. In the meantime, I'm leaving for a few hours.L.Adamson

Not sure what the issue might be Larry. couple of people been able to unzip OK. I can try and upload the *.acf file itself.I'll leave the first download available also.http://www.x-scenery.com/xscontent/downloads/RV-6.acf

Not sure what the issue might be Larry. couple of people been able to unzip OK. I can try and upload the *.acf file itself.I'll leave the first download available also.http://www.x-scenery.com/xscontent/downloads/RV-6.acf

I've got some right seat time in a rv6 (and a few loops) so I may have to give it a try too...Thanks!

Not sure what the issue might be Larry. couple of people been able to unzip OK. I can try and upload the *.acf file itself.I'll leave the first download available also.http://www.x-scenery.com/xscontent/downloads/RV-6.acf

NEVERMIND....................... It's installed. Any particular version? It's in 9.21rc at the moment.L.Adamson