Couldn't agree more! 787 hydraulics are super obnoxiously loud and high pitched, literally drowned out engines noise even, If you sit next to/middle of the wings during your flight, it drives you nuts.
It’s slower using the EMDP (electric motor driven pump) vs the EDP (engine driven pump). The EMDP by itself doesn’t have the volume to move the gear up as fast. If they hooked a hydraulic mule then you would have the same volume as an EDP.
The 1st thing you notice once the gear handle is moved to the up position is two things. The gear doors open & the truck actuator move the truck assembly to the up position. The reason for moving the truck assembly up is so that the gear assembly will fit into the wheel well.
Are these all hydraulic, electro-hydraulic, or large electric actuators? I have heard the 787 has replaced several hydraulic systems with electrical ones, as in the brakes.
@@WillLanting I always thought the high pitched whine of the 787 was also a PTU since it activates when control surfaces are moving (much like the A320 starts barking once an engine is turned on
@@WillLanting I realize this is a old vid but the algorithm got me here. Are the pumps the reason it kind of moves in a jerky motion when going up? It didn't seem to retract smoothly.
@@Unclefire that is correct. It’s running on its electric pumps only. They’re low flow compared to the larger engine driven pumps. The electric pumps work as demand or back up when the engine pumps fail or are loaded up. On their own they struggle.
@@WillLanting the center hydraulic system is the only one dedicated to gear retraction and extension and it has only electrical pumps. correct me if I am wrong, there must be another reason why it operates so slow on jacks, if it is actually slower.
I don't think it's simple really. That is some heavy gear at has to deal with speeds of TO/landing. It has to fold into a fairly tight bay and articulate a few different ways.
Авто/Мото
0:09 i love they way the landing gear tilted like an a350 before retracting
Those are some serious jack stands
In case anyone is wondering, this is Qantas' centenary 787 VH-ZNJ
Nice colors on that aircraft - looks sharp.
Would have only wondered if it weren't emblazoned on the bottom fuselage..
This was wheely good!
Some serious Hydraulic Action going on there.
Another cool video thank you for sharing as always will :)
Thanks ANS. More to come soon.
Wow, this is really awesome!
the noise here does in no way, reflect how LOUD this actually is. The air gen compressors and hydraulic actuators are stupid loud.
Couldn't agree more! 787 hydraulics are super obnoxiously loud and high pitched, literally drowned out engines noise even, If you sit next to/middle of the wings during your flight, it drives you nuts.
The perfect amount of gear tilt, not too much not too little.
It’s slower using the EMDP (electric motor driven pump) vs the EDP (engine driven pump). The EMDP by itself doesn’t have the volume to move the gear up as fast. If they hooked a hydraulic mule then you would have the same volume as an EDP.
It certainly makes a difference. With my 747s a proper robust air supply has a good result as well.
Maravilhosa engenharia...💚💛💙🇧🇷🇧🇷🇧🇷
We 've come a very long way since the Western Lysander !
Love the Dreamliner.
I wanna be Aircraft enginner.
Thank you for uploading!
no you really dont - I was one
The 1st thing you notice once the gear handle is moved to the up position is two things. The gear doors open & the truck actuator move the truck assembly to the up position. The reason for moving the truck assembly up is so that the gear assembly will fit into the wheel well.
Are these all hydraulic, electro-hydraulic, or large electric actuators? I have heard the 787 has replaced several hydraulic systems with electrical ones, as in the brakes.
Landing gear is drive by hydraulics. Yes, correct. Some smaller systems have been replaced by electricity-hyd systems.
you can hear that PTU going nyeeeeeee
You're thinking of the A320...
@@WillLanting I always thought the high pitched whine of the 787 was also a PTU since it activates when control surfaces are moving (much like the A320 starts barking once an engine is turned on
@@kingghidorah8106 probably... I'm not licensed on the 787 and I keep well clear of it.. so it possible has something like that..
I don’t get it like there is not 2 truck positioners
Qantas
Always seems so slow when the aircraft is on jacks.
Good observation and you’re correct. The reason is that it is running Hyds on electrical pumps only. No engine pumps being run.
@@WillLanting I realize this is a old vid but the algorithm got me here. Are the pumps the reason it kind of moves in a jerky motion when going up? It didn't seem to retract smoothly.
@@Unclefire that is correct. It’s running on its electric pumps only. They’re low flow compared to the larger engine driven pumps. The electric pumps work as demand or back up when the engine pumps fail or are loaded up. On their own they struggle.
@@WillLanting the center hydraulic system is the only one dedicated to gear retraction and extension and it has only electrical pumps. correct me if I am wrong, there must be another reason why it operates so slow on jacks, if it is actually slower.
@@kuermit256 correct. No engine driven pumps to provide normal flow. Just elec pumps.
So why is it so slow?
permission to re-use this clip?
Sorry... no.. it gets hard with copyright issues...
qantas 787-9 100th year variant
QF100
Its normal
ลักษระคล้าย.กัน กับ.อินโดนีดศีย..รึ.ฟิริปิน.
Take something simple and complicate the hell out of it!
Probably not that much more complicated really. Just an extra actuator to level the gear before retraction.
I don't think it's simple really. That is some heavy gear at has to deal with speeds of TO/landing. It has to fold into a fairly tight bay and articulate a few different ways.
ข้อ.ห้าม.รึปฏิเสธ..ฝ่ายืรัพยากร.รึ.กคัาสัมพันธ์.รึ.นัก.ลงทุน.สุมพันธ์.
Looks like Biden speed to me.