Request UMMU Compatible Helicopter?

[Urwumpe]

The maximum thrust of the afterburner thruster for one engine should be AB_Thrust - dry_thrust.

Real afterburners also start in rapid stages, but for most observers, instantly at full after burner thrust is OK.

Maybe you should constantly recalculate maximum afterburner and dry thrust depending on air speed and air density for more realism. A higher speed slightly increases thrust, a higher altitude lowers it. The thrust given for the engine are usually static test results, sea-level pressure, zero velocity.

 

[gattispilot]

Ok. So the thrust for 1 after burner enginer is (104.53-55.6)=48.93* ATM density
Dry thrust: 12,500 lbf (55.6 kN) each
Thrust with afterburner: 23,500 lbf (104.53 kN) each

I wonder about ISp and amount of fuel for AB

 

[Urwumpe]

Remember atm density is 1.28 at sea-level - not 1.0.

 

[gattispilot]

Ok. I guess A new texture just for the AB also. I need to get the flight stable first. She just climbs like a rocket. hard to keep the climb rate low.

---------- Post added at 03:55 PM ---------- Previous post was at 09:01 AM ----------

const double FUELMASS = 8377;
const double ISP = 50000.0;
const double MAXMAINTH =2*55600;
const double MAXMAINTHAB =2*48930;

	th_first[0] = CreateThruster (_V(-.749,0,-10.7), _V(0,0,1), MAXMAINTH, TANK, ISP);
	th_first[1] = CreateThruster (_V(.749,0,-10.7), _V(0,0,1), MAXMAINTH, TANK, ISP);

	th_AB[0] = CreateThruster (_V(-.749,0,-10.7), _V(0,0,1), MAXMAINTHAB, TANK1, ISP);
	th_AB[1] = CreateThruster (_V(.749,0,-10.7), _V(0,0,1), MAXMAINTHAB, TANK1, ISP);

ATMD1= GetAtmDensity () ;

ATMadjusted=(55600*ATMD1);
ATMABadjusted=(48930*ATMD1);

SetThrusterMax0 (th_first[0],ATMadjusted);
SetThrusterMax0 (th_first[1],ATMadjusted);
SetThrusterMax0 (th_AB[0],ATMABadjusted);
SetThrusterMax0 (th_AB[1],ATMABadjusted);





 if (GetThrusterLevel (th_first[0])>.95){
		SetThrusterLevel(th_AB[0],1);
		SetThrusterLevel(th_AB[1],1);}

She is FAST

 

[BruceJohnJennerLawso]

Better add a second set of thrusters, that produce the afterburner thrust. Old jets are VERY slow without afterburner. Add the Afterburner, when you exceed thrust level 0.95 on the main thrusters.

That would probably help. I found it very challenging to break mach one in level flight, must need some jungle juice :lol:

 

[gattispilot]

here she is with afterburner thrust added. The speed is 524m/s on the ground.

 

[Urwumpe]

524 m/s? What is the total thrust force according to Orbiter? And what is the drag force?

 

[gattispilot]

On the thrust I can get the info from the thrust MFD. But on the drag do I need to get from the visual help arrows?

 

[Urwumpe]

On the thrust I can get the info from the thrust MFD. But on the drag do I need to get from the visual help arrows?

Yes.

 

[gattispilot]

Here are 2 images one of the thrust of main and the other AB

drag is 1.210MN

if (GetThrusterLevel (th_first[0])>.95){
SetThrusterLevel(th_AB[0],1);
SetThrusterLevel(th_AB[1],1);}


th_first[0] = CreateThruster (_V(-.749,0,-10.7), _V(0,0,1), MAXMAINTH, TANK, ISP);
th_first[1] = CreateThruster (_V(.749,0,-10.7), _V(0,0,1), MAXMAINTH, TANK, ISP);

th_AB[0] = CreateThruster (_V(-.749,0,-10.7), _V(0,0,1), MAXMAINTHAB, TANK1, ISP);
th_AB[1] = CreateThruster (_V(.749,0,-10.7), _V(0,0,1), MAXMAINTHAB, TANK1, ISP);const double FUELMASS = 8377;


const double FUELMASS = 8377;
const double ISP = 50000.0;
const double MAXMAINTH =2*55600;
const double MAXMAINTHAB =2*48930;

PROPELLANT_HANDLE TANK,hpr,TANK1;
TANK = CreatePropellantResource (FUELMASS);
TANK1 = CreatePropellantResource (FUELMASS);

 

[gattispilot]

Dauphin2 with base. I just made Kev's base into a vessel so a Ummu can open doors.

http://dl.dropbox.com/u/71242599/DOLPHIN2A.zip

 

[gattispilot]

Remake of the NASA version of the Chinook copter. It is UCGO and UMMU capable. Can hold up to 4 crates. Has 2 hoists

https://dl.dropbox.com/u/71242599/chinnooknasa.zip