Ship Simulator

English forum => Ship Simulator 2008 => General discussions => Topic started by: saltydog on February 11, 2008, 21:02:08

Title: does the Red Eagle have variable throttle ?
Post by: saltydog on February 11, 2008, 21:02:08

I am a fan of the Red Eagle, but lately there is this question on my mind:
Does the Red Eagle have a variable throttle or not..?
My understanding of the Voith-Scheider propulsion system is that the propellors allways turn at a constant speed.
But in both the sounds and the HUD in ShipSim it would seem otherwise..
So I'm a bit confused here... :)

Title: Re: does the Red Eagle have variable throttle ?
Post by: Bottman on February 11, 2008, 21:39:41

You are right, the original VSP works with constant rpm, but the shipsim VSP not, because we can't control the pitch but the revolutions. It's a kind of compromise and they are working on a possibility to steer the VSP units around 360 degree instead 180 degree into each direction. So we come closer to reality in fact.

Cheers

Title: Re: does the Red Eagle have variable throttle ?
Post by: saltydog on February 11, 2008, 21:47:06

Thanks Bottman, I'm glad I got it right... I guess the sounds and the HUD may be something to work on in Red Eagle.. I didn't know the steering is originally 360, that would be a great addition.. :)

Title: Re: does the Red Eagle have variable throttle ?
Post by: mvsmith on February 11, 2008, 22:04:15

Dawg,
The simple answer is the HUD is wrong. RPM should be interpreted as % thrust—500 RPM = 100% thrust. The VSP does, in fact, always turn at constant speed and in a single direction (except for some installations where it is run at reduced RPM for economy in straight steaming over long distances).
The Red Eagle VSPs can thrust in any direction—360 degrees.
A lot of confusion arises from the fact that there are many different control-stand versions. Some have a Johnson bar the can change pitch from REV 100% thru 0% to FWD 100%.
The actual operation of the VSP is explained in a lengthy topic in Small Talk.
Marty

Title: Re: does the Red Eagle have variable throttle ?
Post by: LucAtC on February 11, 2008, 22:15:57

Also, the investigation of the MAIB about an accident that happened because of the controls of Red Falcon, sister ship of Red Eagle, explains well how these controls are set, and also that the RPM have preset values, selected by push buttons.
http://www.maib.gov.uk/cms_resources/Red%20Falcon.pdf
Regards,
Luc

Title: Re: does the Red Eagle have variable throttle ?
Post by: saltydog on February 11, 2008, 22:23:14

Thanks for the explanation of how the HUD should be interpreted... :)

Title: Re: does the Red Eagle have variable throttle ?
Post by: capt kieran on February 11, 2008, 22:57:29

that is a very interesting version of propeller but i have the smae quetion how do they work do they spin in circles or and do they angle the roters 

please explane

Title: Re: does the Red Eagle have variable throttle ?
Post by: capt kieran on February 11, 2008, 22:58:09

and ive seen them quiet common on smaller sized tugs to

Title: Re: does the Red Eagle have variable throttle ?
Post by: saltydog on February 11, 2008, 22:59:40

Think of them as big egg-whisks kieran, one in front and the other in back..
If you like to know more, use the search function.. :)

Title: Re: does the Red Eagle have variable throttle ?
Post by: mvsmith on February 12, 2008, 06:54:34

Quote from: capt kieran on February 11, 2008, 22:57:29

that is a very interesting version of propeller but i have the smae quetion how do they work do they spin in circles or and do they angle the roters 

please explane

Capt Kieran,
Here is the VSP topic that should explain how the VSP works. If you have any specific questions on the VSP, you can PM me, or post them in that topic.
Marty

http://www.shipsim.com/ShipSimForum/index.php/topic,2550.msg26287.html#msg26287 (http://www.shipsim.com/ShipSimForum/index.php/topic,2550.msg26287.html#msg26287)

Title: Re: does the Red Eagle have variable throttle ?
Post by: Apejens on June 07, 2008, 12:41:03

The Norwegian car ferry "Julsund", http://www.fjordfaehren.de/no_f2/julsund2004.htm , har the same propulsion as "Red Eagle", however, it is controlled by two joysticks for each of the VSP units. On the side of the manovering desk, there is two thottle levers, one for each VSP. When manovering, you just point the joystick the way you want the end of the vessel that the joystick belongs to. The joysticks control both propeller pitch and rudder pitch.