Project c130-T

[gattispilot]

This is something Urwumpe and i have been building. The original mesh was from Flight Gear. I made modifications. A VC is planned. But right now I am having issues getting the lift and drag right so you flies like a real one.

So any help would be GREAT.

CENTER CONSOLE

 

[BruceJohnJennerLawso]

This is something Urwumpe and i have been building. The original mesh was from Flight Gear. I made modifications. A VC is planned. But right now I am having issues getting the lift and drag right so you flies like a real one.

So any help would be GREAT.

CENTER CONSOLE

I think more info on what the actual problems you are having with the aerodynamics is needed, but I like it, looks very good so far :thumbup:.

Out of curiosity, how hard is it to convert from the Flightgear mesh format?

 

[asbjos]

The last months you first made the NH90 Helicopter, then the crane and now you are making an aircraft. Do you ever sleep, eat, work or anything else? :blink:

 

[BruceJohnJennerLawso]

The last months you first made the NH90 Helicopter, then the crane and now you are making an aircraft. Do you ever sleep, eat, work or anything else? :blink:

He does. Its Urwumpe were not sure about :lol:.

To be honest though, once you understand a general concept in programming modules, its not that hard to extend it to further ones. Its just getting that understanding thats hard.

 

[Urwumpe]

He does. Its Urwumpe were not sure about :lol:.

I sleep, but did I already mention that I am so good at OOP, that I can do it in my sleep. :lol: Honestly, I am the most unproductive add-on developer in the forum here.

To be honest though, once you understand a general concept in programming modules, its not that hard to extend it to further ones. Its just getting that understanding thats hard.

His problem is actually physics... I currently look at getting the information into something that helps him.

 

[liber]

Good a C-130 with module,looking forward to try it.
I convert too C-130 before some time,I think model from TurboSqud or 3DWH.
I doubt SC3 config could help you in your configuration.

 

[gattispilot]

Yes sleep. On the converting of Flight Gear. I converted from .ac to 3ds to An8 and then to mesh. Not too bad.

on the C130 it is the lift/drag part.

	CreateAirfoil3 (LIFT_VERTICAL, _V(0,0,-0.3), VLiftCoeff, 0, 4, 162,10.1);	
	// wing and body lift+drag components

	CreateAirfoil3 (LIFT_HORIZONTAL, _V(0,0,-17), HLiftCoeff, 0, 10, 70, 1.5);

I think the lift vertical is correct.
4- c airfoil chord length [m]
162 S wing area [m2 ]
10.1 A wing aspect ratio

But not sure what values to use for the horizonal

 

[RisingFury]

But not sure what values to use for the horizonal

First try with the tail fin only. With planes, the body doesn't usually stabilize much, as about half of it is before the CG and about half of it behind it (at least in this case). Both halves then cancel each other out.

That said, after you test with the tail fin only, you should include the body as well. When you're testing, check what happens when you bank the plane to about 45°. Check if it starts sliding in the direction you banked it. If yes, add the effect of the body and test again.

 

[sputnik]

Gattispilot,

At a glance, those figures look about correct for horizontal lift. How is it behaving?
Keep in mind that the vertical tail on the C-130 is ludicrously oversized for normal flying...it's sized for engine-out operations, which you might not even be modeling.

Gentlemen,

C-130 pilot is a job I've held; I was an instructor pilot with 4,000 hrs. Send what you've got my way; I'll take a look at it.

 

[gattispilot]

Thanks. It is required alot of thrust and goes too fast. I'll put it together and pm you a link okay?

 

[mojoey]

Please let there be an AC-130 in the works...

 

[gattispilot]

I was warned that would would happen. But I think once this C13o gets fixed and a mesh is handy it wouldn't be too hard

 

[BruceJohnJennerLawso]

I sleep, but did I already mention that I am so good at OOP, that I can do it in my sleep. :lol: Honestly, I am the most unproductive add-on developer in the forum here.

I did notice you havent released anything since Orbiter 2006 :lol:. It seems a bit bizarre, but you do make your mark advising/guiding/assisting newer devs. To each his own...

 

[Loru]

I did notice you havent released anything since Orbiter 2006 :lol:. It seems a bit bizarre, but you do make your mark advising/guiding/assisting newer devs. To each his own...

 

[gattispilot]

The aerodynamics are the issue. Urwumpe provided the info on the wing profile so I added it to the lift vertical

void VLiftCoeff (VESSEL *v, double aoa, double M, double Re, void *context, double *cl, double *cm, double *cd)
{
	int i;
	//const int nabsc = 9;
	//static const double AOA[nabsc] = {-180*RAD,-60*RAD,-30*RAD, -2*RAD, 15*RAD,20*RAD,25*RAD,60*RAD,180*RAD};
	//static const double CL[nabsc]  = {       0,      0,   -0.4,      0,    0.7,     1,   0.8,     0,      0};
	//static const double CM[nabsc]  = {       0,      0,  0.014, 0.0039, -0.006,-0.008,-0.010,     0,      0};
	 const int nabsc=33;
 static const double AOA[nabsc]={-180*RAD,-165*RAD,-150*RAD,-135*RAD,-120*RAD,-105*RAD,-90*RAD,-75*RAD,-60*RAD,-45*RAD,-30*RAD, -25*RAD , -20*RAD , -15*RAD , -10*RAD , -5*RAD , 0*RAD , 5*RAD , 10*RAD , 15*RAD , 20*RAD , 25*RAD,  30*RAD, 60*RAD, 90*RAD, 120*RAD, 150*RAD, 165*RAD, 180*RAD };

 static const double CL[nabsc] ={-.305,-1.689,-.798,-.322,-.163,-.119,-.108,-.103,-.141,-.249,-.591,-.807,-1.013,-1.006,-.721,-.312,0.305, .906,.942 ,0.901,1.380,1.355,1.223,.906,.642,.144,.093,.159,.735,1.253, -.302} ;
 static const double CM[nabsc] ={-.060,-.040,-.061,-.059,-.050,-.035,-.018,-.004,.003,.001,-.002,-.005,-.010,-0.017,-0.046, -0.060,-.073,-.084,-.040,-.065,-.061,-.059,-.035,-.004, .001,-.005,-.060};
	for (i = 0; i < nabsc-1 && AOA[i+1] < aoa; i++);
	double f = (aoa-AOA[i]) / (AOA[i+1]-AOA[i]);
	*cl = CL[i] + (CL[i+1]-CL[i]) * f;  // aoa-dependent lift coefficient
	*cm = CM[i] + (CM[i+1]-CM[i]) * f;  // aoa-dependent moment coefficient
	double saoa = sin(aoa);
	double pd = 0.015 + 0.4*saoa*saoa;  // profile drag
	*cd = pd + oapiGetInducedDrag (*cl, 1.5, 0.7) + oapiGetWaveDrag (M, 0.75, 1.0, 1.1, 0.04);
	// profile drag + (lift-)induced drag + transonic/supersonic wave (compressibility) drag
}

I have greatly increased the flaps.

CreateControlSurface2 (AIRCTRL_FLAP,         24, 1.5, _V( 0,0,-1), AIRCTRL_AXIS_XPOS,anim_flaps);

I have place the 4 thrusters at 0 because if I placed them where the engine are in the y axis the plane nose dives into the ground.

but now at full thrust I never get up.
notice the lift and drag arrows. So I am creating lift

but then I noticed this at around 200m/s the lift direction is reversed.

 

[gattispilot]

Has any used the FlightDataRecmfd? [ame="http://www.orbithangar.com/searchid.php?ID=759"]http://www.orbithangar.com/searchid.php?ID=759[/ame]Triying to record lift/drag aoa,... to see why she won't lift off. I can get to unpause to record the flight data.

 

[MaverickSawyer]

Just a helpful hint: DON'T include a US Coast Guard paint job with this that carries "1705" on the nose. That one was lost over 3 years ago at the cost of 9 lives: 7 crew of the HC-130H, and the 2 crew aboard a USMC AH-1W that they collided with while on a search pattern.

 

[n122vu]

Honestly, I am the most unproductive add-on developer in the forum here.

Dunno, I may just be giving you a run for your money there :lol:

This looks awesome guys! Can't wait to fly it!