Request UMMU Compatible Helicopter?

[gattispilot]

Does the Sea King I redid load?

 

[NTpspE]

Me either. I just tried again on a "ultra clean" installation, no add-ons at all except the Dauphin (not even sound). I'm stumped.

Kev (the author of the original heli's) has a mod on OH that's supposed to fix some of his vessels going invisible. I think its to do with the graphics format or something. Not sure but maybe that will help.

Kind regards,
NT

 

[Mythos]

weird. Reduced the RSC. If I just apply hover then then ceiling is around 4500. Not sure why the meshes are not showing up?

You should only get Hover and rotors if K is pressed.

With that version and full vertical thrust I reach about 4200m altitude and then fall down (still full thrust) to 170m. Raising slowly I reach the point where thrust equals gravity at 2500m.

For the horizontal speed I easily got 1400m/s at an altitude of 500m. Then I had to reduce pitch manually so higher speed could be reached slower.

 

[fort]

Kev has a mod on OH that's supposed to fix some of his vessels going invisible.

Kind regards,
NT

I believe to remember that Kev had realized a pack of dll for different addons that it had products and can be to render compatible them with a new version of Orbiter ( or maybe dlled versions of vessels made at first with spacecraft cfg and ini... ). This is a very vague memory. But does the current problem comes from there ? After all, I think that your essays were done with the dolphin version 2 currently available on Orbithangar.

I have the same concern that PhantomCruiser : the Dolphin is invisible But as I do not have UMMU, or UCGO installed, it's difficult to pronounce me. Are they essential to allow, at least, to see the Dolphin ? There is at less a line in the scenario that refers to UCGO ( that I know very little ) and some others at the end that say me strictly anything. Also...

 

[gattispilot]

With that version and full vertical thrust I reach about 4200m altitude and then fall down (still full thrust) to 170m. Raising slowly I reach the point where thrust equals gravity at 2500m.

For the horizontal speed I easily got 1400m/s at an altitude of 500m. Then I had to reduce pitch manually so higher speed could be reached slower.

Not sure about the horizontal speed.

ON the invisible vessels. Is there any thing in the log. I have seen where a cfg is wrong. or no module is found.

The sea King, Sky crane and dolphin were done using the same basic code.

 

[Urwumpe]

You should try a higher drag factor.

 

[fort]

Good. Resolved. For a new installation of Orbiter P1 ( without UMMU or UCGO ), to return the mesh visible, and at least for that, PayloadManager ( User-side files ) is required:

http://www.kulch.spb.ru/Eng/PM_dwn.html

( There was some comments about it a little higher in this topic )

Without PayloadManager.dll, i have:

- an alert "PayloadManager.dll not found"

- and in the Orbiter.log...

>>> ERROR: Could not load vessel module: DOLPHIN
>>> [Vessel::LoadModule | .\Vessel.cpp | 5442]

...and the Dolphin is invisible.

 

[gattispilot]

I might/can make a non Payload version.

Try this new dolphin I adjusted the PMI/cross section. I might need to increase RCS now.

where is the drag adjusted?

	SetRotDrag (_V(1.5,1.5,1.5));


//Airfoils
 CreateAirfoil3(LIFT_VERTICAL,_V(0,0,-0.5),VLiftCoeff,0,0,1,1);
 CreateAirfoil3(LIFT_HORIZONTAL,_V(0,0,-4),HLiftCoeff,0,0,1,1);

 

[Urwumpe]

Drag is what your lift function returns as cd parameter. cd = Drag Coefficient.

Also, helicopter rotors produce quite a lot of induced drag, so you use remember to set a rather low value for span efficiency. You currently use the excellent value of 1.0, in reality it should be around 0.7 or maybe less (0.85-0.95 are good values for real aircraft, helicopter rotors are rectangular blades usually and produce a lot more vortices than straight wings)

 

[gattispilot]

Thanks. So reduce the value from 1 to .7, right? Which number value is the drag in the airfoils?

Also on the missing dll. Make sure it is in the correct directory. should be cfg/vessels/

 

[fort]

Hello gattispilot,

First, thank you for all those Helicopters Mmu;

About the subject of the missing dll:

if the PayloadManager.dll is there, there is not any problem with DOLPHIN.dll. In others words: if PayloadManager.dll is there, the DOLPHIN.dll is found by Orbiter and Orbiter.log correct.

About: "I might/can make a non Payload version.":

do as you like. After all, i think that Payload Manager can be usefull in others circumstances; so with its around 3000 kb, it is not very "expensive" for anyone to have it.

Thank you again.

 

[gattispilot]

Your Welcome. Once I get the setting right I'll do that. (make a payload MAnager one and an a Non Payload Manager. I think I may need to adjust the attachment position on the dolphin
Thats weird about the payload Manager.

 

[Urwumpe]

Which number value is the drag in the airfoils?

Look into your lift function (VLiftCoeff, HLiftCoeff)

 

[gattispilot]

//vertical lift component (wings and body)
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};
 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
}
//############################################################################//
//horizontal lift component (vertical stabilisers and body)
void HLiftCoeff(VESSEL *v,double betta,double M,double Re,void *context,double *cl,double *cm,double *cd)
{
 int i;
 const int nabsc=8;
 static const double BETA[nabsc]={-180*RAD,-135*RAD,-90*RAD,-45*RAD,45*RAD,90*RAD,135*RAD,180*RAD};
 static const double CL[nabsc]  ={       0,    +0.3,      0,   -0.3,  +0.3,     0,   -0.3,      0};
 for(i=0;i<nabsc-1 && BETA[i+1]<betta;i++);
 *cl=CL[i]+(CL[i+1]-CL[i])*(betta-BETA[i])/(BETA[i+1]-BETA[i]);
 *cm=0.0;
 *cd=0.015+oapiGetInducedDrag(*cl,1.5,0.6)+oapiGetWaveDrag(M,0.75,1.0,1.1,0.04);
}
....

 CreateAirfoil3(LIFT_VERTICAL,_V(0,0,-0.5),VLiftCoeff,0,0,1,1);
	// wing and body lift+drag components

 CreateAirfoil3(LIFT_HORIZONTAL,_V(0,0,-4),HLiftCoeff,0,0,1,1);

	// vertical stabiliser and body lift and drag components

Not sure what 1.0 to change to .7

 

[Urwumpe]

getInducedDrag seems to be the correct function to change the parameter... but I am not sure, which one it now was... had mistaken the efficiency factor with the aspect ratio in the airfoil definition.

 

[gattispilot]

ok thanks. I guess we will see how shes flies.

Here is the next and maybe last copter the CH47b Chinook.

I the one thing I need to fix is the different shades on the cockpit ring

and go back update with new flight info and add beacons

 

[PhantomCruiser]

Invisible helicopter - - solved!

Thanks guys, it was the payload manager that did the trick. I didn't see any error complaining about it missing, and I thought I had it installed.

It's all good now. Excellent work Gattispilot!

 

[Urwumpe]

I think I have a nice idea there... what about a [ame="http://en.wikipedia.org/wiki/Link_16"]Link 16[/ame] MFD for navigation/mission planning? I have Java code for making MIL-STD-2525C maps (including DEM data), that kind of symbology is also used on NATO helicopters for the navigation/tactical displays.

 

[gattispilot]

It looked like for NATO copters there is a rotary wing two black triangles on their side. I don't use Payload Manger. But added it in. Does it work?

Does any use them for Parachute jumps? How does that work. I could see unloaded cargo off the Chinook and use a chute to deploy the cargo. Do you use EVA out and open a chute?

 

[fort]

I didn't see any error complaining about it missing

Without PayloadManager.dll, it was not an error, ( and, for example, in Orbiter.log ). It was an alert, like that: