I believe this was one of the first jobs this tug participated in brand new out of the yard. They were doing an emergency stop (practice) on the ship to see how fast the Response could stop a Tanker if it lost power. The guys sitting in the galley said it was very nerve racking to see water coming over the rails while looking through the portholes.
Ships use tugs to act like a sea anchor, this tug is being dragged by a ship. It means the ship can use its own engine power to create wash past the rudders to assist in steering. At very low speed a ships rudders become less effective.
If a traditional tug ended up at this angle to the tow rope it could be capsized. The Voith propulsion system means the tug can be driven in any direction at any speed, they often run backwards or sidewards at high speed.
as the tug is making angle in the water the force on the towing rope is increased by the surface of the underwatership multiplied with the speed an the angle
In general this will work also for other types of tugboats
someone explain the POINT of towing like this? you all say "pffft...that's nowhere NEAR tipping...."; yeah, until it tips, then you cry WHY!!!!!!!! Again, I don't get the point...why isn't he pulling from the stern and in a relatively straight line?
@kenfo0 Hello kenfo0 the tug is using the indirect towing methode which enables the tug to generate much higher line forces than just with the propellers. Good designed Voith Water Tractors can generate up to 2,5 times the bollard pull in lines forces.
@Holtreck that's the whole point...I don't see how it can pull harder this way. I could see if it was trying to stop a vessel that this might provide more "friction", using the weight of the water. I'll see if I can find more info. Thanks.
No rudder is used, because Voith Water Tractors have no rudder, only the propulsion unit(s). this looks dramatic but is, in fact, a recognised way of indirect towing which water tractors excel at!
I believe this was one of the first jobs this tug participated in brand new out of the yard. They were doing an emergency stop (practice) on the ship to see how fast the Response could stop a Tanker if it lost power. The guys sitting in the galley said it was very nerve racking to see water coming over the rails while looking through the portholes.
sailorman1011 2 months ago
Ships use tugs to act like a sea anchor, this tug is being dragged by a ship. It means the ship can use its own engine power to create wash past the rudders to assist in steering. At very low speed a ships rudders become less effective.
If a traditional tug ended up at this angle to the tow rope it could be capsized. The Voith propulsion system means the tug can be driven in any direction at any speed, they often run backwards or sidewards at high speed.
jonathane1976 3 months ago
@jonathane1976 Thanks for this comment
Holtreck 3 months ago
i served for years on this type of tugboats....
as the tug is making angle in the water the force on the towing rope is increased by the surface of the underwatership multiplied with the speed an the angle
In general this will work also for other types of tugboats
badpakrokje 6 months ago
OK, thx Holger! The animation helped a lot.
kenfo0 8 months ago
someone explain the POINT of towing like this? you all say "pffft...that's nowhere NEAR tipping...."; yeah, until it tips, then you cry WHY!!!!!!!! Again, I don't get the point...why isn't he pulling from the stern and in a relatively straight line?
kenfo0 8 months ago
@kenfo0
Holtreck 8 months ago
@kenfo0 Hello kenfo0 the tug is using the indirect towing methode which enables the tug to generate much higher line forces than just with the propellers. Good designed Voith Water Tractors can generate up to 2,5 times the bollard pull in lines forces.
Holtreck 8 months ago 3
@Holtreck that's the whole point...I don't see how it can pull harder this way. I could see if it was trying to stop a vessel that this might provide more "friction", using the weight of the water. I'll see if I can find more info. Thanks.
kenfo0 8 months ago
no where close to tripping,however, it doesnt feel natural! my standing order is all wether tight doors dogged during an assist....
dusky233fc 10 months ago
How close to tripping is that? If you spilled my chille in the galley for a photo shot I'd climb into the wheelhouse and give you what for.
YaterSpoon86 1 year ago
what's the border of tipping the tug on it's side in indirect towing?
gkicosev 1 year ago
cool video guys.
thom.
fuelban 1 year ago
Comment removed
BelgianEvo 1 year ago
@BelgianEvo : Hmm i wonder why my question is removed ..... it was a normall question, however i can't remember it.
BelgianEvo 10 months ago
Impresionante.
bolonia79 1 year ago
nice video of some proper indirect towing.
what rate of turn was the ship making?
BR7970 2 years ago
No rudder is used, because Voith Water Tractors have no rudder, only the propulsion unit(s). this looks dramatic but is, in fact, a recognised way of indirect towing which water tractors excel at!
peedeebee15 2 years ago
Great video! What kind of forces were being registered on the line? How much rudder was required on the ship to overcome the tug's forces?
Pilotsf 2 years ago
there intension to stop the vessel they assisted
novierJC87 2 years ago
I dont get it is it pulling or being pulled?
davetileguy 2 years ago
Are you working on this tug Holtreck?
metzen96 2 years ago