View Full Version : Marine One start up
tartare
15th Oct 2018, 04:58
I have noticed that when POTUS talks to reporters, or walks to the machine, the turbines often sound like they're running, but the blades are not yet turning.
Does the VH-3D have a ground idle setting which is used at this point - once he's on board then flight idle selected and blades begin to turn?
Sikpilot
15th Oct 2018, 05:10
Sounds like there is a rotor brake like in the S58 and S76
John Eacott
15th Oct 2018, 05:39
Standard Sea King start is with rotor brake on, both engines running before engaging rotors.
At least it used to be ;)
skadi
15th Oct 2018, 06:21
Standard Sea King start is with rotor brake on, both engines running before engaging rotors.
At least it used to be ;)
At least the Westland Kings have an AccessoryDrive ( actuated free wheeling unit ) so #1 could drive the hydraulics/generators without load on the rotorbrake...
skadi
Sloppy Link
15th Oct 2018, 06:47
Errrm....APU?
212man
15th Oct 2018, 07:27
Errrm....APU?
Errmm....on a Sea King?
Non-PC Plod
15th Oct 2018, 08:14
Not exactly a Sea King - I believe its known as an H3 across the pond. I think it has different engines, but I would imagine the same gearbox, including the accessory drive. As a maritime helicopter, the acc drive is part of the basic design to provide hydraulic power to fold/unfold the blades onboard ship.
John Eacott
15th Oct 2018, 08:15
At least the Westland Kings have an AccessoryDrive ( actuated free wheeling unit ) so #1 could drive the hydraulics/generators without load on the rotorbrake...
skadi
As do the Sikorsky Sea King/SH-3 :ok:
Getting back to the OP, the engines can be running and the rotors held on the rotor brake.
BTC8183
15th Oct 2018, 10:37
Not often seen, as photos of the VH-3 tend to be of the LH side and main cabin door, but the RH MLG sponson has an APU attached to it.
skadi
15th Oct 2018, 11:00
Not often seen, as photos of the VH-3 tend to be of the LH side and main cabin door, but the RH MLG sponson has an APU attached to it.
Ok, here it is from left side
http://www.collectivemag.com/wp-content/uploads/2016/12/Presidential-Sikorsky-VH-3B-departing-Bob-Hope-International-Airport-in-Glendale-California.-Photo-by-Jason-Jorgensen-730x480.jpg
skadi
212man
15th Oct 2018, 12:41
Not often seen, as photos of the VH-3 tend to be of the LH side and main cabin door, but the RH MLG sponson has an APU attached to it.
You learn something new every day!
Carbon Bootprint
15th Oct 2018, 15:41
Ok, here it is from left side
That would appear to be from the "other" left side, but thanks for the picture! :ok:
Non-PC Plod
15th Oct 2018, 15:54
Nah, that's the blow-dryer for his rug!
Torquetalk
15th Oct 2018, 16:06
Nah, that's the blow-dryer for his rug!
Is that a metaphor for his hair? Can imagine it comes in handy for some industrial scale daily hairdressing.
skadi
15th Oct 2018, 16:08
That would appear to be from the "other" left side, but thanks for the picture! :ok:
Oh yes! :ok:
skadi
Sloppy Link
15th Oct 2018, 18:32
Errmm....on a Sea King?
Errrm....feel free to acknowledge....
MightyGem
15th Oct 2018, 19:16
Hardly standard fit though.
Thomas coupling
15th Oct 2018, 19:24
Sikorsky H3. T-58 engines. Engine sits at Ground Idle in Acc drive. No clutch, no holding on rotor brake. Just sitting there at 51-58 Nf.
His helo is one of 5. They fly mostly everywhere as a 5 ship and swap postions frequently. This deters G2A missiles locking onto the one with the Protus onboard.
The APU is a test bed being readied for the replacement programme for the presidents helicopter.
krypton_john
15th Oct 2018, 20:02
Errrm....feel free to acknowledge....
Well, to be specific, you won't find it on an actual Sea King...
krypton_john
15th Oct 2018, 20:04
Sikorsky H3. T-58 engines. Engine sits at Ground Idle in Acc drive. No clutch, no holding on rotor brake. Just sitting there at 51-58 Nf.
His helo is one of 5. They fly mostly everywhere as a 5 ship and swap postions frequently. This deters G2A missiles locking onto the one with the Protus onboard.
The APU is a test bed being readied for the replacement programme for the presidents helicopter.
Presumably the Donald would not be aboard the test bed? So the baddies' chances are now 1 in 4!
Apate
15th Oct 2018, 20:26
Every photo of the starboard side of the aircraft that I can find has the "APU" above the sponson, so I don't think this is a test bed fitment.
As the S92 comes with an APU by default, it doesn't make much sense to have to test one on a totally different platform.
So the VH-3 comes equipped with an APU as standard :ok: