HI Guys! 

 

This question is for beta tester or whoever can answe and i am sure only beta tester can  :lol:. This is maybe a really stupid question but since i am getting bored i ask for it. 

 

In some or many FSX plane if u load the plane over the MTOW at the VR it lifts up easily like the weight of the plane is within the parameters. I would like to know if possible if  i load the 777 over its MTOW can i lift it up easily or i can have problems of rotation? Same is for the V speed. In case i abort before the V1 does the p,lane stop before the end of runway? and the opposite is if i try to abort the flight after V1 do i overshoot the runway? Of course u can say depends how far from V1 u abort the flight but i am simply curious about this performances. I know it sopunds stupid but it is just curiousity. Keep in mind when i say load it up over the MTOW i dont mean 100 pounds over i mean over over  :lol:

 

 

I would like to know if possible if  i load the 777 over its MTOW can i lift it up easily or i can have problems of rotation?

 

Rotation is more a function of CG than weight.

 

 

 

Same is for the V speed. In case i abort before the V1 does the p,lane stop before the end of runway?

 

It's not guaranteed, no.

 

 

 

and the opposite is if i try to abort the flight after V1 do i overshoot the runway?

 

I'd say yes with relative certainty.  If you abort after V1 even at the appropriate V1 for that weight, you're going off the end (even the FCTM states that historically, aborting near V1 has put people off the end of the runway because the RTO was not initiated fully before V1).

thanks for the answer actually i meant for the CG as sometimes in some plane if i set the wrong trim related to the CG given the plane rotate at VR without problems

HI Guys! 

 

This question is for beta tester or whoever can answe and i am sure only beta tester can  :lol:. This is maybe a really stupid question but since i am getting bored i ask for it. 

 

In some or many FSX plane if u load the plane over the MTOW at the VR it lifts up easily like the weight of the plane is within the parameters. I would like to know if possible if  i load the 777 over its MTOW can i lift it up easily or i can have problems of rotation? Same is for the V speed. In case i abort before the V1 does the p,lane stop before the end of runway? and the opposite is if i try to abort the flight after V1 do i overshoot the runway? Of course u can say depends how far from V1 u abort the flight but i am simply curious about this performances. I know it sopunds stupid but it is just curiousity. Keep in mind when i say load it up over the MTOW i dont mean 100 pounds over i mean over over  :lol:

 

 

Hello,

 

the only to try it is with the performance and flight manual handy and of course a good gut. 

 

the weight, the CG, the air density(and altitude correlated) , the temperatures, length of the runway and so on.

 

there is a lot of factors not only one.

 

but I think a 773 well trimmed with a long runway at sea level can do a lot but don't ask for landing quickly.

 

all the best.

 

Phil

thanks for the answer actually i meant for the CG as sometimes in some plane if i set the wrong trim related to the CG given the plane rotate at VR without problems

But that's not what you asked, so Kyle's answer was right. Anyway I've not yet found any FSX plane that didn't rotate differently if the trim was set incorrectly. Certainly not any PMDG sim.

I'd say yes with relative certainty. If you abort after V1 even at the appropriate V1 for that weight, you're going off the end (even the FCTM states that historically, aborting near V1 has put people off the end of the runway because the RTO was not initiated fully before V1).

At light weight on a long runway it's not certain at all. There may well be enough runway to stop. In normal operation that's not very likely though. However, regardless of how much runway is left if you are above V1 it's much safer to take a problem into the air than it is to attempt to stop and create more problems for yourself.

@Alfrdo - VR is just the calculated speed to rotate in order to reach V2+10 at least 35 feet above the runway, you should be looking at Vmu or Vlo if you want to test if the aircraft actually lifts off around the correct speed for its gross weight.

 

@ Kyle, has PMDG simulated runway conditions on the 777? Apparently this was left out on the NGX, I have a few FS9 addons that simulate this perfectly.

 

Thinking about purchasing the FSX product in the link below. Would be great if accurate wet stopping distances are built into PMDG T7

 

http://secure.simmarket.com/fsps-sim-physics-x.phtml

 

Cheers

@Alfrdo - VR is just the calculated speed to rotate in order to reach V2+10 at least 35 feet above the runway, you should be looking at Vmu or Vlo if you want to test if the aircraft actually lifts off around the correct speed for its gross weight.

 

I think it's just V2 at 35ft, and that's single engine with the other falling at V1.

I think it's just V2 at 35ft, and that's single engine with the other falling at V1.

Yeah I think it is just down to the airline. V2 can at times be very close to Vmca so an additional 10 knots is added.

 

unfortunately I am away from home for a while so no access to my documents.

Yeah I think it is just down to the airline. V2 can at times be very close to Vmca so an additional 10 knots is added.

 

unfortunately I am away from home for a while so no access to my documents.

 

Vmca can't be greater than Vr, not V2.

 

V2 is safe flying speed with an engine inoperative, which as you mentioned must be reached at 35ft above the end of the runway. Vr as you say is the speed at which you rotate to achieve said speed and height. V2 + 10 doesn't come into play with respect to performance requirements.

Vmca can't be greater than Vr, not V2.

 

V2 is safe flying speed with an engine inoperative, which as you mentioned must be reached at 35ft above the end of the runway. Vr as you say is the speed at which you rotate to achieve said speed and height. V2 + 10 doesn't come into play with respect to performance requirements.

Hi Jordan, correct, apologies brain now in gear Definitely a reason for V2 + 10, and perhaps I was thinking increasing Vr to V2 when using the improved climb method, either way it doesn't affect Vmca. again unfortunately I don't have the docs to hand.

 

Cheers

Thinking about purchasing the FSX product in the link below. Would be great if accurate wet stopping distances are built into PMDG T7

 

http://secure.simmarket.com/fsps-sim-physics-x.phtml

 

Cheers

 

I think products like this are bogus - you cannot actually alter the sim's physics, that stuff is all hard coded. They're using camera tricks and probably playing with the brakes or something like that. We don't model wet/dry/ice runway stuff because the sim itself doesn't actually model them.

 

I would be very surprised if any of what this program does works with the 777 because of how much if the airplane is custom coded.

Thanks Ryan,

 

But one of the addons I am involved with does actually simulate this correctly, although this is for fs9. I believe the project tupolev does also simulate this.

 

I guess maybe it is differant for FSX? Not being a developer I have no idea. it does definitely work for me in FS9, right down to using the TOPCAT data for my landing/ take off stopping calculations. One of my jobs was to test it against the real A320 along with Anti skid perfomance, ground spoilers & normal/alternate braking distances.

 

If I try to land in freezing rain then it's game over, the addon I use claims to affect stopping distance by reading the weather, precipitation intensity and detects if it is rain or snow.

 

The only downside I noticed is that instead of remaining damp, the runway and your resulting stopping distance would instantly return to dry conditions if it stopped raining/snowing.

 

Anyway, no big deal! Just looking forward to getting my hands on the 777

I believe the project tupolev does also simulate this.

It certainly does!

 

I loaded an aircraft to 100,000,000 lbs for fun in FS - it flew normally.

 

Weight seems to make no difference to the flight dynamics. In fact, MS flight dynamics are a joke. Modern systems can do so much better than that (and for those that think a highly realistic flight model would hurt frame rate - you would be very much mistaken).

 

A few things to demonstrate how rubbish MSFS flight dynamics are:

 

* Try taking off with the *slats* retracted - should be impossible but it isn't.

* Deployment of slats at high altitude should result in violent pitch up - it does not

* Accelerating beyond critical Mach number should result in Mach tuck - it does not

* The stall speed at altitude is far too slow (in fact, MSFS does not correctly model AoA) - "coffin corner" is thus not modelled

* Accelerated stall is not possible

 

Best regards,

Robin.

 

 

* Accelerating beyond critical Mach number should result in Mach tuck - it does not
* The stall speed at altitude is far too slow (in fact, MSFS does not correctly model AoA) - "coffin corner" is thus not modelled

 

Woah what is Mach tuck?  I don't fly real world with mach so first I've heard of it.  I guess I can google.  In the NGX I do get coffin corner in certain circumstances.  Have PMDG somehow figured out a way to simulate this or will FSX not stall at the correct speed no matter what?  Is the ngx coffin cornering just a visual touch?