Oh, c'mon Robert....just release the pics. None of us here are that incredibly anal that we'd notice, or make any comments. Oh, and by the way, in your photo of yourself, your left collar is .011 inches below your right collar. You might want to fix that.

 

 

LOL we would have pics but some people insist on running over to airliners.net to compare the preview shots to RL photos that were taken at a different angle in different lighting with a cell phone camera..

so it flies then? lol

so it flies then? lol

 

No, sorry. I have heard from very reliable sources that the FAA has grounded the project because PMDG didn't follow up, on the some of the things the FAA pointed out, at their last visit to the PMDG HQ. So sorry! But I'm sure they'll fix the issues ASAP to let all of us customers happy soon enough! ^_^

 

(Just talking about how realistic the 777 is!) :ph34r:

hahaha

Hi, Robert:

 

As you're aware of, we all appreciate your team's efforts into giving us a quality product. This is something I'd be interested in hearing: When the LPT's and fans spin down on the aircraft after engine cutoff, they tend to whine until centrifigal force allows the blade retainer "christmas trees" to loosen up in the hubs, after which the engines sound like a kid with a playing card in their bicycle spokes. The hot section sounds different than the fan. It would be really cool to have your view in front of #1 or #2's nacelle (or behind), and hear that... They also tick as they rotate if a breeze is blowing through them; speed and intensity of the ticking is proportional to the breeze blowing through them. I think the NGX does this to a very limited extent, but the fans do not freewheel like they do in RL on a windy day. This is just a "like to have", not a "must have". Not a necessity, but really cool. :wub:

 

I personally am really looking forward to this release. I'd like to see PMDG do a CRJ, too!

 

Best, and have a happy new year.

 

Kev

If you have no idea what Rob is talking about in this detailing; then check this video out, all movements on the wing are evidentially shown.

 

Shameless Plug

If you have no idea what Rob is talking about in this detailing; then check this video out, all movements on the wing are evidentially shown.

In the following video I recorded last year, the inboard ailerons seem to move extremely rapidly—I wonder whether this is due to aircraft vibrations or flight computer interference.

 

It appears that not much yoke displacement is required before the spoilers are used. This is one aspect of the animations of Captain Sim products that seems to be inaccurate.

 

Also, only select spoilers are used for roll control and in the initial moments after landing. In all the B777 landings I have seen, the spoilers seem to extend in two distinct stages after touchdown. I find this to be less elegant than the single smooth spoiler deployment stage of modern Airbus aircraft.

I noticed that there seemed to be additional flap deployment immediately before touchdown by a few degrees. In my opinion, there's a reason the FLCS is killing the lift over the outboard wing segment before the inboard wing segment. I'm not sure what that reason is, or even if I'm correct.

I noticed that there seemed to be additional flap deployment immediately before touchdown by a few degrees.

Are you referring to the inboard ailerons (which somewhat resemble the flaps)? If so, it's probably just a coincidence that the pilot had to use a moderately large left input before touchdown, possibly due to aircraft drift or winds. Maybe this created the illusion that the flaps were being lowered (they would never be extended at such a low altitude, as the trajectory of the aircraft could be disrupted, with devastating loss of control consequences).

 

If not, do you have a time reference?

This is something I'd be interested in hearing: When the LPT's and fans spin down on the aircraft after engine cutoff, they tend to whine until centrifigal force allows the blade retainer "christmas trees" to loosen up in the hubs, after which the engines sound like a kid with a playing card in their bicycle spokes.

 

I can second that. After I got my engineering degree I interned for a few months at a part-145 CAMO facility that did maintenance on Bombardiers (mainly Learjets, Challengers and the odd Global Express). Whenever you park a learjet outside the hangar and the wind is over ~10kts, the blades start windmilling and make a terrific racket. Every blade is loosely attached to the blade hub by the firtree root, so it goes "clink" once on its way up, and once on its way down - and there are 22 of them on a Garrett TFE731 (geared turbofan powering the Learjet 55. Coincidentally the GE90 also has 22 main fan blades...). I think a good description of the noise is somewhere between an extremely loud bicycle freewheel, and someone shaking a can full of bolts :lol:. What would be really impressive is if you could tie the noise to the windspeed on the field - higher windspeed gives higher N1 windmilling RPM, so it makes the clinks louder and more frequent. You could just tie the noise to N1 and have it play at low RPMs when starting up, just like in the real thing.

 

As I usually stayed on the outside when the engines were started, I can also tell you that as RPM increases the centrifugal force pulls on the blades radially and thus the clinking noise gradually decreases and stops (because centrifugal force becomes significantly greater than the force of gravity on the blades - so it stops them from wiggling around tangentially when the pull of gravity on the blade changes direction [twice per rev]).

If not, do you have a time reference?

 

It appeared at 2:57, but there is a lot of items moving, so it could have been something else raising up giving an illusion of flap movement.

Does anyone know the source of the whining in both of the landing videos just prior to touchdown (2:57 in the ANZ vid)? It sounds similar to the flap extension noises so maybe a hydraulic pump of some sort? Does the 777 have an auxiliary hydraulic pump in anticipation of the control surface and thrust reverser actuations after landing?

Does the 777 have an auxiliary hydraulic pump in anticipation of the control surface and thrust reverser actuations after landing?

 

As I understand it there are two types of pumps for each of the three systems, normal and demand. For the left and right systems, the normal is the engine driven pump and for the centre systems the normal is an electric pump. Each left and right system has an electric demand pump, while the centre system has two air driven demand pumps and the RAT in case of pressure loss in the centre system. The demand pumps activate when flaps, slats or gear is actuated. The pumps also 'anticipate' hydraulic demand by turning on during the take-off roll and just prior to landing, which are the times when the most hydraulics are needed. So in answer to your question, yes.

Does anyone know the source of the whining in both of the landing videos just prior to touchdown (2:57 in the ANZ vid)? It sounds similar to the flap extension noises so maybe a hydraulic pump of some sort? Does the 777 have an auxiliary hydraulic pump in anticipation of the control surface and thrust reverser actuations after landing?

I believe it indeed occurs at approximately 30 ft in preparation for the actions you described (perhaps braking as well?).

As I understand it there are two types of pumps for each of the three systems, normal and demand. For the left and right systems, the normal is the engine driven pump and for the centre systems the normal is an electric pump. Each left and right system has an electric demand pump, while the centre system has two air driven demand pumps and the RAT in case of pressure loss in the centre system. The demand pumps activate when flaps, slats or gear is actuated. The pumps also 'anticipate' hydraulic demand by turning on during the take-off roll and just prior to landing, which are the times when the most hydraulics are needed. So in answer to your question, yes.

I believe it indeed occurs at approximately 30 ft in preparation for the actions you described (perhaps braking as well?).

 

 

Many thanks to both of you. It seemed the most likely (logical) answer but I'm very, very unfamiliar with the B777.